content/browser/web_contents/web_contents_impl.cc

// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/browser/web_contents/web_contents_impl.h"

#include <stddef.h>

#include <cmath>
#include <utility>
#include <vector>

#include "base/bind.h"
#include "base/command_line.h"
#include "base/debug/dump_without_crashing.h"
#include "base/feature_list.h"
#include "base/files/file_path.h"
#include "base/i18n/character_encoding.h"
#include "base/lazy_instance.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/memory/ptr_util.h"
#include "base/memory/ref_counted.h"
#include "base/metrics/histogram_macros.h"
#include "base/metrics/user_metrics.h"
#include "base/no_destructor.h"
#include "base/process/process.h"
#include "base/single_thread_task_runner.h"
#include "base/stl_util.h"
#include "base/strings/string16.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "base/task/post_task.h"
#include "base/threading/thread_task_runner_handle.h"
#include "base/time/time.h"
#include "base/trace_event/trace_event.h"
#include "build/build_config.h"
#include "components/download/public/common/download_stats.h"
#include "components/rappor/public/rappor_utils.h"
#include "components/url_formatter/url_formatter.h"
#include "content/browser/accessibility/accessibility_tree_formatter_blink.h"
#include "content/browser/bad_message.h"
#include "content/browser/browser_main_loop.h"
#include "content/browser/browser_plugin/browser_plugin_embedder.h"
#include "content/browser/browser_plugin/browser_plugin_guest.h"
#include "content/browser/child_process_security_policy_impl.h"
#include "content/browser/devtools/devtools_instrumentation.h"
#include "content/browser/devtools/protocol/page_handler.h"
#include "content/browser/devtools/render_frame_devtools_agent_host.h"
#include "content/browser/display_cutout/display_cutout_host_impl.h"
#include "content/browser/dom_storage/dom_storage_context_wrapper.h"
#include "content/browser/dom_storage/session_storage_namespace_impl.h"
#include "content/browser/download/mhtml_generation_manager.h"
#include "content/browser/download/save_package.h"
#include "content/browser/find_request_manager.h"
#include "content/browser/frame_host/cross_process_frame_connector.h"
#include "content/browser/frame_host/frame_tree_node.h"
#include "content/browser/frame_host/interstitial_page_impl.h"
#include "content/browser/frame_host/navigation_entry_impl.h"
#include "content/browser/frame_host/navigation_handle_impl.h"
#include "content/browser/frame_host/navigation_request.h"
#include "content/browser/frame_host/navigator_impl.h"
#include "content/browser/frame_host/render_frame_host_impl.h"
#include "content/browser/frame_host/render_frame_proxy_host.h"
#include "content/browser/gpu/gpu_data_manager_impl.h"
#include "content/browser/loader/loader_io_thread_notifier.h"
#include "content/browser/loader/resource_dispatcher_host_impl.h"
#include "content/browser/manifest/manifest_manager_host.h"
#include "content/browser/media/audio_stream_broker.h"
#include "content/browser/media/audio_stream_monitor.h"
#include "content/browser/media/capture/web_contents_audio_muter.h"
#include "content/browser/media/media_web_contents_observer.h"
#include "content/browser/media/session/media_session_impl.h"
#include "content/browser/plugin_content_origin_whitelist.h"
#include "content/browser/renderer_host/render_process_host_impl.h"
#include "content/browser/renderer_host/render_view_host_delegate_view.h"
#include "content/browser/renderer_host/render_view_host_impl.h"
#include "content/browser/renderer_host/render_widget_host_impl.h"
#include "content/browser/renderer_host/render_widget_host_input_event_router.h"
#include "content/browser/renderer_host/render_widget_host_view_base.h"
#include "content/browser/renderer_host/render_widget_host_view_child_frame.h"
#include "content/browser/renderer_host/text_input_manager.h"
#include "content/browser/screen_orientation/screen_orientation_provider.h"
#include "content/browser/site_instance_impl.h"
#include "content/browser/web_contents/javascript_dialog_navigation_deferrer.h"
#include "content/browser/web_contents/web_contents_view_child_frame.h"
#include "content/browser/web_contents/web_contents_view_guest.h"
#include "content/browser/webui/generic_handler.h"
#include "content/browser/webui/web_ui_controller_factory_registry.h"
#include "content/browser/webui/web_ui_impl.h"
#include "content/common/browser_plugin/browser_plugin_constants.h"
#include "content/common/browser_plugin/browser_plugin_messages.h"
#include "content/common/drag_messages.h"
#include "content/common/frame_messages.h"
#include "content/common/input_messages.h"
#include "content/common/page_messages.h"
#include "content/common/page_state_serialization.h"
#include "content/common/render_message_filter.mojom.h"
#include "content/common/view_messages.h"
#include "content/common/widget_messages.h"
#include "content/public/browser/ax_event_notification_details.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/browser_plugin_guest_manager.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/content_browser_client.h"
#include "content/public/browser/download_manager.h"
#include "content/public/browser/file_select_listener.h"
#include "content/public/browser/focused_node_details.h"
#include "content/public/browser/guest_mode.h"
#include "content/public/browser/invalidate_type.h"
#include "content/public/browser/javascript_dialog_manager.h"
#include "content/public/browser/keyboard_event_processing_result.h"
#include "content/public/browser/load_notification_details.h"
#include "content/public/browser/navigation_details.h"
#include "content/public/browser/notification_details.h"
#include "content/public/browser/notification_service.h"
#include "content/public/browser/notification_types.h"
#include "content/public/browser/render_widget_host_iterator.h"
#include "content/public/browser/restore_type.h"
#include "content/public/browser/security_style_explanations.h"
#include "content/public/browser/ssl_status.h"
#include "content/public/browser/storage_partition.h"
#include "content/public/browser/system_connector.h"
#include "content/public/browser/web_contents_binding_set.h"
#include "content/public/browser/web_contents_delegate.h"
#include "content/public/browser/web_ui_controller.h"
#include "content/public/common/bindings_policy.h"
#include "content/public/common/child_process_host.h"
#include "content/public/common/content_constants.h"
#include "content/public/common/content_features.h"
#include "content/public/common/content_switches.h"
#include "content/public/common/page_state.h"
#include "content/public/common/page_zoom.h"
#include "content/public/common/referrer_type_converters.h"
#include "content/public/common/result_codes.h"
#include "content/public/common/url_utils.h"
#include "content/public/common/web_preferences.h"
#include "media/base/user_input_monitor.h"
#include "net/base/url_util.h"
#include "net/http/http_cache.h"
#include "net/http/http_transaction_factory.h"
#include "net/traffic_annotation/network_traffic_annotation.h"
#include "net/url_request/url_request_context.h"
#include "net/url_request/url_request_context_getter.h"
#include "ppapi/buildflags/buildflags.h"
#include "services/device/public/mojom/constants.mojom.h"
#include "services/metrics/public/cpp/ukm_recorder.h"
#include "services/network/public/cpp/features.h"
#include "services/service_manager/public/cpp/connector.h"
#include "services/service_manager/public/cpp/interface_provider.h"
#include "third_party/blink/public/common/associated_interfaces/associated_interface_provider.h"
#include "third_party/blink/public/common/frame/sandbox_flags.h"
#include "third_party/blink/public/common/mime_util/mime_util.h"
#include "third_party/blink/public/mojom/loader/pause_subresource_loading_handle.mojom.h"
#include "third_party/blink/public/mojom/mediastream/media_stream.mojom-shared.h"
#include "third_party/blink/public/platform/web_security_style.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "ui/accessibility/ax_tree_combiner.h"
#include "ui/base/layout.h"
#include "ui/events/base_event_utils.h"
#include "ui/events/blink/web_input_event_traits.h"
#include "ui/gl/gl_switches.h"

#if defined(OS_WIN)
#include "content/browser/renderer_host/dip_util.h"
#include "ui/gfx/geometry/dip_util.h"
#endif

#if defined(OS_ANDROID)
#include "content/browser/android/date_time_chooser_android.h"
#include "content/browser/android/java_interfaces_impl.h"
#include "content/browser/web_contents/web_contents_android.h"
#include "services/device/public/mojom/nfc.mojom.h"
#else  // !OS_ANDROID
#include "content/browser/host_zoom_map_impl.h"
#include "content/browser/host_zoom_map_observer.h"
#endif  // OS_ANDROID

#if BUILDFLAG(ENABLE_PLUGINS)
#include "content/browser/media/session/pepper_playback_observer.h"
#endif

namespace content {
namespace {

const int kMinimumDelayBetweenLoadingUpdatesMS = 100;
const char kDotGoogleDotCom[] = ".google.com";

base::LazyInstance<std::vector<
    WebContentsImpl::FriendWrapper::CreatedCallback>>::DestructorAtExit
    g_created_callbacks = LAZY_INSTANCE_INITIALIZER;

void NotifyCacheOnIO(
    scoped_refptr<net::URLRequestContextGetter> request_context,
    const GURL& url,
    const std::string& http_method,
    const base::Optional<url::Origin>& top_frame_origin) {
  net::HttpCache* cache = request_context->GetURLRequestContext()->
      http_transaction_factory()->GetCache();
  if (cache)
    cache->OnExternalCacheHit(url, http_method, top_frame_origin);
}

bool HasMatchingProcess(FrameTree* tree, int render_process_id) {
  for (FrameTreeNode* node : tree->Nodes()) {
    if (node->current_frame_host()->GetProcess()->GetID() == render_process_id)
      return true;
  }
  return false;
}

bool HasMatchingWidgetHost(FrameTree* tree, RenderWidgetHost* host) {
  // This method scans the frame tree rather than checking whether
  // host->delegate() == this, which allows it to return false when the host
  // for a frame that is pending or pending deletion.
  if (!host)
    return false;

  for (FrameTreeNode* node : tree->Nodes()) {
    if (node->current_frame_host()->GetRenderWidgetHost() == host)
      return true;
  }
  return false;
}

void UpdateAccessibilityModeOnFrame(RenderFrameHost* frame_host) {
  static_cast<RenderFrameHostImpl*>(frame_host)->UpdateAccessibilityMode();
}

void ResetAccessibility(RenderFrameHost* rfh) {
  static_cast<RenderFrameHostImpl*>(rfh)->AccessibilityReset();
}

// Helper for GetInnerWebContents().
bool GetInnerWebContentsHelper(std::vector<WebContents*>* all_guest_contents,
                               WebContents* guest_contents) {
  auto* web_contents_impl = static_cast<WebContentsImpl*>(guest_contents);
  if (web_contents_impl->GetBrowserPluginGuest()->attached() &&
      !GuestMode::IsCrossProcessFrameGuest(web_contents_impl)) {
    all_guest_contents->push_back(web_contents_impl);
  }
  return false;
}

RenderFrameHostImpl* FindOpenerRFH(const WebContents::CreateParams& params) {
  RenderFrameHostImpl* opener_rfh = nullptr;
  if (params.opener_render_frame_id != MSG_ROUTING_NONE) {
    opener_rfh = RenderFrameHostImpl::FromID(params.opener_render_process_id,
                                             params.opener_render_frame_id);
  }
  return opener_rfh;
}

// Returns |true| if |type| is the kind of user input that should trigger the
// user interaction observers.
bool IsUserInteractionInputType(blink::WebInputEvent::Type type) {
  // Ideally, this list would be based more off of
  // https://whatwg.org/C/interaction.html#triggered-by-user-activation.
  return type == blink::WebInputEvent::kMouseDown ||
         type == blink::WebInputEvent::kGestureScrollBegin ||
         type == blink::WebInputEvent::kTouchStart ||
         type == blink::WebInputEvent::kRawKeyDown;
}

// Returns |true| if |type| is the kind of user input that should be used as
// a user gesture signal for resource load dispatches.
bool IsResourceLoadUserInteractionInputType(blink::WebInputEvent::Type type) {
  return type == blink::WebInputEvent::kMouseDown ||
         type == blink::WebInputEvent::kTouchStart ||
         type == blink::WebInputEvent::kRawKeyDown;
}

// Ensures that OnDialogClosed is only called once.
class CloseDialogCallbackWrapper
    : public base::RefCountedThreadSafe<CloseDialogCallbackWrapper> {
 public:
  using CloseCallback =
      base::OnceCallback<void(bool, bool, const base::string16&)>;

  explicit CloseDialogCallbackWrapper(CloseCallback callback)
      : callback_(std::move(callback)) {}

  void Run(bool dialog_was_suppressed,
           bool success,
           const base::string16& user_input) {
    if (callback_.is_null())
      return;
    std::move(callback_).Run(dialog_was_suppressed, success, user_input);
  }

 private:
  friend class base::RefCountedThreadSafe<CloseDialogCallbackWrapper>;
  ~CloseDialogCallbackWrapper() {}

  CloseCallback callback_;
};

bool FrameCompareDepth(RenderFrameHostImpl* a, RenderFrameHostImpl* b) {
  return a->frame_tree_node()->depth() < b->frame_tree_node()->depth();
}

bool AreValidRegisterProtocolHandlerArguments(const std::string& protocol,
                                              const GURL& url,
                                              const url::Origin& origin) {
  ChildProcessSecurityPolicyImpl* policy =
      ChildProcessSecurityPolicyImpl::GetInstance();
  if (policy->IsPseudoScheme(protocol))
    return false;

  if (!url.SchemeIsHTTPOrHTTPS())
    return false;

  url::Origin url_origin = url::Origin::Create(url);
  if (!url_origin.IsSameOriginWith(origin))
    return false;

  return true;
}

}  // namespace

std::unique_ptr<WebContents> WebContents::Create(
    const WebContents::CreateParams& params) {
  return WebContentsImpl::CreateWithOpener(params, FindOpenerRFH(params));
}

std::unique_ptr<WebContents> WebContents::CreateWithSessionStorage(
    const WebContents::CreateParams& params,
    const SessionStorageNamespaceMap& session_storage_namespace_map) {
  std::unique_ptr<WebContentsImpl> new_contents(
      new WebContentsImpl(params.browser_context));
  RenderFrameHostImpl* opener_rfh = FindOpenerRFH(params);
  FrameTreeNode* opener = nullptr;
  if (opener_rfh)
    opener = opener_rfh->frame_tree_node();
  new_contents->SetOpenerForNewContents(opener, params.opener_suppressed);

  for (auto it = session_storage_namespace_map.begin();
       it != session_storage_namespace_map.end(); ++it) {
    new_contents->GetController()
        .SetSessionStorageNamespace(it->first, it->second.get());
  }

  WebContentsImpl* outer_web_contents = nullptr;
  if (params.guest_delegate) {
    // This makes |new_contents| act as a guest.
    // For more info, see comment above class BrowserPluginGuest.
    BrowserPluginGuest::CreateInWebContents(new_contents.get(),
                                            params.guest_delegate);
    outer_web_contents = static_cast<WebContentsImpl*>(
        params.guest_delegate->GetOwnerWebContents());
  }

  new_contents->Init(params);
  if (outer_web_contents)
    outer_web_contents->InnerWebContentsCreated(new_contents.get());
  return new_contents;
}

void WebContentsImpl::FriendWrapper::AddCreatedCallbackForTesting(
    const CreatedCallback& callback) {
  g_created_callbacks.Get().push_back(callback);
}

void WebContentsImpl::FriendWrapper::RemoveCreatedCallbackForTesting(
    const CreatedCallback& callback) {
  for (size_t i = 0; i < g_created_callbacks.Get().size(); ++i) {
    if (g_created_callbacks.Get().at(i) == callback) {
      g_created_callbacks.Get().erase(g_created_callbacks.Get().begin() + i);
      return;
    }
  }
}

WebContents* WebContents::FromRenderViewHost(RenderViewHost* rvh) {
  if (!rvh)
    return nullptr;
  return rvh->GetDelegate()->GetAsWebContents();
}

WebContents* WebContents::FromRenderFrameHost(RenderFrameHost* rfh) {
  if (!rfh)
    return nullptr;
  return static_cast<RenderFrameHostImpl*>(rfh)->delegate()->GetAsWebContents();
}

WebContents* WebContents::FromFrameTreeNodeId(int frame_tree_node_id) {
  FrameTreeNode* frame_tree_node =
      FrameTreeNode::GloballyFindByID(frame_tree_node_id);
  if (!frame_tree_node)
    return nullptr;
  return WebContentsImpl::FromFrameTreeNode(frame_tree_node);
}

void WebContents::SetScreenOrientationDelegate(
    ScreenOrientationDelegate* delegate) {
  ScreenOrientationProvider::SetDelegate(delegate);
}

// WebContentsImpl::DestructionObserver ----------------------------------------

class WebContentsImpl::DestructionObserver : public WebContentsObserver {
 public:
  DestructionObserver(WebContentsImpl* owner, WebContents* watched_contents)
      : WebContentsObserver(watched_contents),
        owner_(owner) {
  }

  // WebContentsObserver:
  void WebContentsDestroyed() override {
    owner_->OnWebContentsDestroyed(
        static_cast<WebContentsImpl*>(web_contents()));
  }

 private:
  WebContentsImpl* owner_;

  DISALLOW_COPY_AND_ASSIGN(DestructionObserver);
};

// WebContentsImpl::ColorChooser ----------------------------------------------
class WebContentsImpl::ColorChooser : public blink::mojom::ColorChooser {
 public:
  ColorChooser(content::ColorChooser* chooser,
               blink::mojom::ColorChooserRequest request,
               blink::mojom::ColorChooserClientPtr client)
      : chooser_(chooser),
        binding_(this, std::move(request)),
        client_(std::move(client)) {
    binding_.set_connection_error_handler(
        base::BindOnce([](content::ColorChooser* chooser) { chooser->End(); },
                       base::Unretained(chooser)));
  }

  ~ColorChooser() override { chooser_->End(); }

  void SetSelectedColor(SkColor color) override {
    chooser_->SetSelectedColor(color);
  }

  void DidChooseColorInColorChooser(SkColor color) {
    client_->DidChooseColor(color);
  }

 private:
  // Color chooser that was opened by this tab.
  std::unique_ptr<content::ColorChooser> chooser_;

  // mojo bindings.
  mojo::Binding<blink::mojom::ColorChooser> binding_;

  // mojo renderer client.
  blink::mojom::ColorChooserClientPtr client_;
};

// WebContentsImpl::WebContentsTreeNode ----------------------------------------
WebContentsImpl::WebContentsTreeNode::WebContentsTreeNode(
    WebContentsImpl* current_web_contents)
    : current_web_contents_(current_web_contents),
      outer_web_contents_(nullptr),
      outer_contents_frame_tree_node_id_(
          FrameTreeNode::kFrameTreeNodeInvalidId),
      focused_web_contents_(current_web_contents) {}

WebContentsImpl::WebContentsTreeNode::~WebContentsTreeNode() {}

std::unique_ptr<WebContents>
WebContentsImpl::WebContentsTreeNode::DisconnectFromOuterWebContents() {
  std::unique_ptr<WebContents> inner_contents =
      outer_web_contents_->node_.DetachInnerWebContents(current_web_contents_);
  OuterContentsFrameTreeNode()->RemoveObserver(this);
  outer_contents_frame_tree_node_id_ = FrameTreeNode::kFrameTreeNodeInvalidId;
  outer_web_contents_ = nullptr;
  return inner_contents;
}

void WebContentsImpl::WebContentsTreeNode::AttachInnerWebContents(
    std::unique_ptr<WebContents> inner_web_contents,
    RenderFrameHostImpl* render_frame_host) {
  WebContentsImpl* inner_web_contents_impl =
      static_cast<WebContentsImpl*>(inner_web_contents.get());
  WebContentsTreeNode& inner_web_contents_node = inner_web_contents_impl->node_;

  inner_web_contents_node.focused_web_contents_ = nullptr;
  inner_web_contents_node.outer_web_contents_ = current_web_contents_;
  inner_web_contents_node.outer_contents_frame_tree_node_id_ =
      render_frame_host->frame_tree_node()->frame_tree_node_id();

  inner_web_contents_.push_back(std::move(inner_web_contents));

  render_frame_host->frame_tree_node()->AddObserver(&inner_web_contents_node);
}

std::unique_ptr<WebContents>
WebContentsImpl::WebContentsTreeNode::DetachInnerWebContents(
    WebContentsImpl* inner_web_contents) {
  std::unique_ptr<WebContents> detached_contents;
  for (std::unique_ptr<WebContents>& web_contents : inner_web_contents_) {
    if (web_contents.get() == inner_web_contents) {
      detached_contents = std::move(web_contents);
      std::swap(web_contents, inner_web_contents_.back());
      inner_web_contents_.pop_back();
      return detached_contents;
    }
  }

  NOTREACHED();
  return nullptr;
}

FrameTreeNode*
WebContentsImpl::WebContentsTreeNode::OuterContentsFrameTreeNode() const {
  return FrameTreeNode::GloballyFindByID(outer_contents_frame_tree_node_id_);
}

void WebContentsImpl::WebContentsTreeNode::OnFrameTreeNodeDestroyed(
    FrameTreeNode* node) {
  DCHECK_EQ(outer_contents_frame_tree_node_id_, node->frame_tree_node_id())
      << "WebContentsTreeNode should only receive notifications for the "
         "FrameTreeNode in its outer WebContents that hosts it.";

  // Deletes |this| too.
  outer_web_contents_->node_.DetachInnerWebContents(current_web_contents_);
}

void WebContentsImpl::WebContentsTreeNode::SetFocusedWebContents(
    WebContentsImpl* web_contents) {
  DCHECK(!outer_web_contents())
      << "Only the outermost WebContents tracks focus.";
  focused_web_contents_ = web_contents;
}

WebContentsImpl*
WebContentsImpl::WebContentsTreeNode::GetInnerWebContentsInFrame(
    const FrameTreeNode* frame) {
  auto ftn_id = frame->frame_tree_node_id();
  for (auto& contents : inner_web_contents_) {
    WebContentsImpl* impl = static_cast<WebContentsImpl*>(contents.get());
    if (impl->node_.outer_contents_frame_tree_node_id() == ftn_id) {
      return impl;
    }
  }
  return nullptr;
}

std::vector<WebContentsImpl*>
WebContentsImpl::WebContentsTreeNode::GetInnerWebContents() const {
  std::vector<WebContentsImpl*> inner_web_contents;
  for (auto& contents : inner_web_contents_)
    inner_web_contents.push_back(static_cast<WebContentsImpl*>(contents.get()));

  return inner_web_contents;
}

// WebContentsImpl -------------------------------------------------------------

WebContentsImpl::WebContentsImpl(BrowserContext* browser_context)
    : delegate_(nullptr),
      controller_(this, browser_context),
      render_view_host_delegate_view_(nullptr),
      created_with_opener_(false),
      node_(this),
      frame_tree_(new NavigatorImpl(&controller_, this),
                  this,
                  this,
                  this,
                  this),
      is_load_to_different_document_(false),
      crashed_status_(base::TERMINATION_STATUS_STILL_RUNNING),
      crashed_error_code_(0),
      waiting_for_response_(false),
      load_state_(net::LOAD_STATE_IDLE, base::string16()),
      upload_size_(0),
      upload_position_(0),
      is_resume_pending_(false),
      interstitial_page_(nullptr),
      has_accessed_initial_document_(false),
      did_first_visually_non_empty_paint_(false),
      capturer_count_(0),
      is_being_destroyed_(false),
      is_notifying_observers_(false),
      notify_disconnection_(false),
      dialog_manager_(nullptr),
      is_showing_before_unload_dialog_(false),
      last_active_time_(base::TimeTicks::Now()),
      closed_by_user_gesture_(false),
      minimum_zoom_percent_(static_cast<int>(kMinimumZoomFactor * 100)),
      maximum_zoom_percent_(static_cast<int>(kMaximumZoomFactor * 100)),
      zoom_scroll_remainder_(0),
      fullscreen_widget_process_id_(ChildProcessHost::kInvalidUniqueID),
      fullscreen_widget_routing_id_(MSG_ROUTING_NONE),
      fullscreen_widget_had_focus_at_shutdown_(false),
      force_disable_overscroll_content_(false),
      last_dialog_suppressed_(false),
      accessibility_mode_(
          GetContentClient()->browser()->GetAXModeForBrowserContext(
              browser_context)),
      audio_stream_monitor_(this),
      media_web_contents_observer_(
          std::make_unique<MediaWebContentsObserver>(this)),
      media_device_group_id_salt_base_(
          BrowserContext::CreateRandomMediaDeviceIDSalt()),
#if !defined(OS_ANDROID)
      page_scale_factor_is_one_(true),
#endif  // !defined(OS_ANDROID)
      is_overlay_content_(false),
      showing_context_menu_(false),
      text_autosizer_page_info_({0, 0, 1.f}),
      native_theme_observer_(this),
      had_inner_webcontents_(false) {
  frame_tree_.SetFrameRemoveListener(
      base::Bind(&WebContentsImpl::OnFrameRemoved,
                 base::Unretained(this)));
#if BUILDFLAG(ENABLE_PLUGINS)
  pepper_playback_observer_.reset(new PepperPlaybackObserver(this));
#endif

  loader_io_thread_notifier_.reset(new LoaderIOThreadNotifier(this));
#if !defined(OS_ANDROID)
  host_zoom_map_observer_.reset(new HostZoomMapObserver(this));
#endif  // !defined(OS_ANDROID)

#if defined(OS_ANDROID)
  display_cutout_host_impl_ = std::make_unique<DisplayCutoutHostImpl>(this);
#endif

  registry_.AddInterface(base::BindRepeating(
      &WebContentsImpl::OnColorChooserFactoryRequest, base::Unretained(this)));

  ui::NativeTheme* native_theme = ui::NativeTheme::GetInstanceForWeb();
  native_theme_observer_.Add(native_theme);
  in_high_contrast_ = native_theme->UsesHighContrastColors();
  in_dark_mode_ = native_theme->SystemDarkModeEnabled();
  preferred_color_scheme_ = native_theme->GetPreferredColorScheme();
}

WebContentsImpl::~WebContentsImpl() {
  // Imperfect sanity check against double free, given some crashes unexpectedly
  // observed in the wild.
  CHECK(!is_being_destroyed_);

  // We generally keep track of is_being_destroyed_ to let other features know
  // to avoid certain actions during destruction.
  is_being_destroyed_ = true;

  // A WebContents should never be deleted while it is notifying observers,
  // since this will lead to a use-after-free as it continues to notify later
  // observers.
  CHECK(!is_notifying_observers_);

  rwh_input_event_router_.reset();

  for (auto& entry : binding_sets_)
    entry.second->CloseAllBindings();

  WebContentsImpl* outermost = GetOutermostWebContents();
  if (this != outermost && ContainsOrIsFocusedWebContents()) {
    // If the current WebContents is in focus, unset it.
    outermost->SetAsFocusedWebContentsIfNecessary();
  }

  if (mouse_lock_widget_)
    mouse_lock_widget_->RejectMouseLockOrUnlockIfNecessary();

  for (FrameTreeNode* node : frame_tree_.Nodes()) {
    // Delete all RFHs pending shutdown, which will lead the corresponding RVHs
    // to be shutdown and be deleted as well.
    node->render_manager()->ClearRFHsPendingShutdown();
    node->render_manager()->ClearWebUIInstances();
  }

  for (RenderWidgetHostImpl* widget : created_widgets_)
    widget->DetachDelegate();
  created_widgets_.clear();

  // Clear out any JavaScript state.
  if (dialog_manager_) {
    dialog_manager_->CancelDialogs(this, /*reset_state=*/true);
  }

  color_chooser_.reset();
  find_request_manager_.reset();

  NotifyDisconnected();

  // Notify any observer that have a reference on this WebContents.
  NotificationService::current()->Notify(
      NOTIFICATION_WEB_CONTENTS_DESTROYED,
      Source<WebContents>(this),
      NotificationService::NoDetails());

  // Destroy all subframes now. This notifies observers.
  GetMainFrame()->ResetChildren();
  GetRenderManager()->ResetProxyHosts();

  // Manually call the observer methods for the root frame tree node. It is
  // necessary to manually delete all objects tracking navigations
  // (NavigationHandle, NavigationRequest) for observers to be properly
  // notified of these navigations stopping before the WebContents is
  // destroyed.
  RenderFrameHostManager* root = GetRenderManager();

  GetController().back_forward_cache().Flush();
  root->current_frame_host()->SetRenderFrameCreated(false);
  root->current_frame_host()->ResetNavigationRequests();

  // Do not update state as the WebContents is being destroyed.
  frame_tree_.root()->ResetNavigationRequest(true, true);
  if (root->speculative_frame_host()) {
    root->speculative_frame_host()->DeleteRenderFrame(
        FrameDeleteIntention::kSpeculativeMainFrameForShutdown);
    root->speculative_frame_host()->SetRenderFrameCreated(false);
    root->speculative_frame_host()->ResetNavigationRequests();
  }

#if BUILDFLAG(ENABLE_PLUGINS)
  // Call this before WebContentsDestroyed() is broadcasted since
  // AudioFocusManager will be destroyed after that.
  pepper_playback_observer_.reset();
#endif  // defined(ENABLED_PLUGINS)

  // If audio is playing then notify external observers of the audio stream
  // disappearing.
  if (is_currently_audible_) {
    is_currently_audible_ = false;
    for (auto& observer : observers_)
      observer.OnAudioStateChanged(false);

    if (GetOuterWebContents())
      GetOuterWebContents()->OnAudioStateChanged();
  }

  for (auto& observer : observers_)
    observer.FrameDeleted(root->current_frame_host());

  for (auto& observer : observers_)
    observer.RenderViewDeleted(root->current_host());

#if defined(OS_ANDROID)
  // For simplicity, destroy the Java WebContents before we notify of the
  // destruction of the WebContents.
  ClearWebContentsAndroid();
#endif

  for (auto& observer : observers_)
    observer.WebContentsDestroyed();

  if (display_cutout_host_impl_)
    display_cutout_host_impl_->WebContentsDestroyed();

  for (auto& observer : observers_)
    observer.ResetWebContents();

  SetDelegate(nullptr);
}

std::unique_ptr<WebContentsImpl> WebContentsImpl::CreateWithOpener(
    const WebContents::CreateParams& params,
    RenderFrameHostImpl* opener_rfh) {
  TRACE_EVENT0("browser", "WebContentsImpl::CreateWithOpener");
  FrameTreeNode* opener = nullptr;
  if (opener_rfh)
    opener = opener_rfh->frame_tree_node();
  std::unique_ptr<WebContentsImpl> new_contents(
      new WebContentsImpl(params.browser_context));
  new_contents->SetOpenerForNewContents(opener, params.opener_suppressed);

  // If the opener is sandboxed, a new popup must inherit the opener's sandbox
  // flags, and these flags take effect immediately.  An exception is if the
  // opener's sandbox flags lack the PropagatesToAuxiliaryBrowsingContexts
  // bit (which is controlled by the "allow-popups-to-escape-sandbox" token).
  // See https://html.spec.whatwg.org/#attr-iframe-sandbox.
  FrameTreeNode* new_root = new_contents->GetFrameTree()->root();
  if (opener) {
    blink::WebSandboxFlags opener_flags = opener_rfh->active_sandbox_flags();
    const blink::WebSandboxFlags inherit_flag =
        blink::WebSandboxFlags::kPropagatesToAuxiliaryBrowsingContexts;
    bool sandbox_propagates_to_auxilary_context =
        (opener_flags & inherit_flag) == inherit_flag;
    if (sandbox_propagates_to_auxilary_context)
      new_root->SetPendingFramePolicy({opener_flags, {}});
    if (opener_flags == blink::WebSandboxFlags::kNone ||
        sandbox_propagates_to_auxilary_context) {
      // TODO(ekaramad, iclelland): Do not propagate feature policies from non-
      // sandboxed disowned openers (rel=noopener).
      // If the current page is not sandboxed, or if the sandbox is to propagate
      // to the popups then opener's feature policy will apply to the new popup
      // as well.
      new_root->SetOpenerFeaturePolicyState(
          opener_rfh->feature_policy()->GetFeatureState());
    }
  }

  // Apply starting sandbox flags.
  blink::FramePolicy frame_policy(new_root->pending_frame_policy());
  frame_policy.sandbox_flags |= params.starting_sandbox_flags;
  new_root->SetPendingFramePolicy(frame_policy);
  new_root->CommitPendingFramePolicy();

  // This may be true even when opener is null, such as when opening blocked
  // popups.
  if (params.created_with_opener)
    new_contents->created_with_opener_ = true;

  WebContentsImpl* outer_web_contents = nullptr;
  if (params.guest_delegate) {
    // This makes |new_contents| act as a guest.
    // For more info, see comment above class BrowserPluginGuest.
    BrowserPluginGuest::CreateInWebContents(new_contents.get(),
                                            params.guest_delegate);
    outer_web_contents = static_cast<WebContentsImpl*>(
        params.guest_delegate->GetOwnerWebContents());
  }

  new_contents->Init(params);
  if (outer_web_contents)
    outer_web_contents->InnerWebContentsCreated(new_contents.get());
  return new_contents;
}

// static
std::vector<WebContentsImpl*> WebContentsImpl::GetAllWebContents() {
  std::vector<WebContentsImpl*> result;
  std::unique_ptr<RenderWidgetHostIterator> widgets(
      RenderWidgetHostImpl::GetRenderWidgetHosts());
  while (RenderWidgetHost* rwh = widgets->GetNextHost()) {
    RenderViewHost* rvh = RenderViewHost::From(rwh);
    if (!rvh)
      continue;
    WebContents* web_contents = WebContents::FromRenderViewHost(rvh);
    if (!web_contents)
      continue;
    if (web_contents->GetRenderViewHost() != rvh)
      continue;
    // Because a WebContents can only have one current RVH at a time, there will
    // be no duplicate WebContents here.
    result.push_back(static_cast<WebContentsImpl*>(web_contents));
  }
  return result;
}

// static
WebContentsImpl* WebContentsImpl::FromFrameTreeNode(
    const FrameTreeNode* frame_tree_node) {
  return static_cast<WebContentsImpl*>(
      WebContents::FromRenderFrameHost(frame_tree_node->current_frame_host()));
}

// static
WebContents* WebContentsImpl::FromRenderFrameHostID(int render_process_host_id,
                                                    int render_frame_host_id) {
  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI) ||
         !BrowserThread::IsThreadInitialized(BrowserThread::UI));
  RenderFrameHost* render_frame_host =
      RenderFrameHost::FromID(render_process_host_id, render_frame_host_id);
  if (!render_frame_host)
    return nullptr;

  return WebContents::FromRenderFrameHost(render_frame_host);
}

// static
WebContentsImpl* WebContentsImpl::FromOuterFrameTreeNode(
    const FrameTreeNode* frame_tree_node) {
  return WebContentsImpl::FromFrameTreeNode(frame_tree_node)
      ->node_.GetInnerWebContentsInFrame(frame_tree_node);
}

RenderFrameHostManager* WebContentsImpl::GetRenderManagerForTesting() {
  return GetRenderManager();
}

bool WebContentsImpl::OnMessageReceived(RenderViewHostImpl* render_view_host,
                                        const IPC::Message& message) {
  for (auto& observer : observers_) {
    // TODO(nick, creis): https://crbug.com/758026: Replace all uses of this
    // variant of OnMessageReceived with the version that takes a
    // RenderFrameHost, and then delete it.
    if (observer.OnMessageReceived(message))
      return true;
  }

  bool handled = true;
  IPC_BEGIN_MESSAGE_MAP_WITH_PARAM(WebContentsImpl, message, render_view_host)
    IPC_MESSAGE_HANDLER(ViewHostMsg_UpdateZoomLimits, OnUpdateZoomLimits)
    IPC_MESSAGE_HANDLER(ViewHostMsg_PageScaleFactorChanged,
                        OnPageScaleFactorChanged)
    IPC_MESSAGE_HANDLER(
        ViewHostMsg_NotifyTextAutosizerPageInfoChangedInLocalMainFrame,
        OnTextAutosizerPageInfoChanged)
#if BUILDFLAG(ENABLE_PLUGINS)
    IPC_MESSAGE_HANDLER(ViewHostMsg_RequestPpapiBrokerPermission,
                        OnRequestPpapiBrokerPermission)
#endif
    IPC_MESSAGE_UNHANDLED(handled = false)
  IPC_END_MESSAGE_MAP()

  return handled;
}

bool WebContentsImpl::OnMessageReceived(RenderFrameHostImpl* render_frame_host,
                                        const IPC::Message& message) {
  {
    WebUIImpl* web_ui = render_frame_host->web_ui();
    if (web_ui && web_ui->OnMessageReceived(message, render_frame_host))
      return true;
  }

  for (auto& observer : observers_) {
    if (observer.OnMessageReceived(message, render_frame_host))
      return true;
  }

  bool handled = true;
  IPC_BEGIN_MESSAGE_MAP_WITH_PARAM(WebContentsImpl, message, render_frame_host)
    IPC_MESSAGE_HANDLER(FrameHostMsg_DomOperationResponse,
                        OnDomOperationResponse)
    IPC_MESSAGE_HANDLER(FrameHostMsg_DidChangeThemeColor,
                        OnThemeColorChanged)
    IPC_MESSAGE_HANDLER(FrameHostMsg_DidFinishDocumentLoad,
                        OnDocumentLoadedInFrame)
    IPC_MESSAGE_HANDLER(FrameHostMsg_DidFinishLoad, OnDidFinishLoad)
    IPC_MESSAGE_HANDLER(FrameHostMsg_DidLoadResourceFromMemoryCache,
                        OnDidLoadResourceFromMemoryCache)
    IPC_MESSAGE_HANDLER(FrameHostMsg_DidDisplayInsecureContent,
                        OnDidDisplayInsecureContent)
    IPC_MESSAGE_HANDLER(FrameHostMsg_DidContainInsecureFormAction,
                        OnDidContainInsecureFormAction)
    IPC_MESSAGE_HANDLER(FrameHostMsg_DidRunInsecureContent,
                        OnDidRunInsecureContent)
    IPC_MESSAGE_HANDLER(FrameHostMsg_DidDisplayContentWithCertificateErrors,
                        OnDidDisplayContentWithCertificateErrors)
    IPC_MESSAGE_HANDLER(FrameHostMsg_DidRunContentWithCertificateErrors,
                        OnDidRunContentWithCertificateErrors)
    IPC_MESSAGE_HANDLER(FrameHostMsg_GoToEntryAtOffset, OnGoToEntryAtOffset)
    IPC_MESSAGE_HANDLER(FrameHostMsg_RegisterProtocolHandler,
                        OnRegisterProtocolHandler)
    IPC_MESSAGE_HANDLER(FrameHostMsg_UnregisterProtocolHandler,
                        OnUnregisterProtocolHandler)
    IPC_MESSAGE_HANDLER(FrameHostMsg_UpdatePageImportanceSignals,
                        OnUpdatePageImportanceSignals)
    IPC_MESSAGE_HANDLER(FrameHostMsg_UpdateFaviconURL, OnUpdateFaviconURL)
#if BUILDFLAG(ENABLE_PLUGINS)
    IPC_MESSAGE_HANDLER(FrameHostMsg_PepperInstanceCreated,
                        OnPepperInstanceCreated)
    IPC_MESSAGE_HANDLER(FrameHostMsg_PepperInstanceDeleted,
                        OnPepperInstanceDeleted)
    IPC_MESSAGE_HANDLER(FrameHostMsg_PepperPluginHung, OnPepperPluginHung)
    IPC_MESSAGE_HANDLER(FrameHostMsg_PepperStartsPlayback,
                        OnPepperStartsPlayback)
    IPC_MESSAGE_HANDLER(FrameHostMsg_PepperStopsPlayback,
                        OnPepperStopsPlayback)
    IPC_MESSAGE_HANDLER(FrameHostMsg_PluginCrashed, OnPluginCrashed)
    IPC_MESSAGE_HANDLER_GENERIC(BrowserPluginHostMsg_Attach,
                                OnBrowserPluginMessage(render_frame_host,
                                                       message))
#endif
    IPC_MESSAGE_UNHANDLED(handled = false)
  IPC_END_MESSAGE_MAP()

  return handled;
}

NavigationControllerImpl& WebContentsImpl::GetController() {
  return controller_;
}

BrowserContext* WebContentsImpl::GetBrowserContext() {
  return controller_.GetBrowserContext();
}

const GURL& WebContentsImpl::GetURL() {
  return GetVisibleURL();
}

const GURL& WebContentsImpl::GetVisibleURL() {
  // We may not have a navigation entry yet.
  NavigationEntry* entry = controller_.GetVisibleEntry();
  return entry ? entry->GetVirtualURL() : GURL::EmptyGURL();
}

const GURL& WebContentsImpl::GetLastCommittedURL() {
  // We may not have a navigation entry yet.
  NavigationEntry* entry = controller_.GetLastCommittedEntry();
  return entry ? entry->GetVirtualURL() : GURL::EmptyGURL();
}

WebContentsDelegate* WebContentsImpl::GetDelegate() {
  return delegate_;
}

void WebContentsImpl::SetDelegate(WebContentsDelegate* delegate) {
  // TODO(cbentzel): remove this debugging code?
  if (delegate == delegate_)
    return;
  if (delegate_)
    delegate_->Detach(this);
  delegate_ = delegate;
  if (delegate_) {
    delegate_->Attach(this);
    // Ensure the visible RVH reflects the new delegate's preferences.
    if (view_)
      view_->SetOverscrollControllerEnabled(CanOverscrollContent());
    if (GetRenderViewHost())
      RenderFrameDevToolsAgentHost::WebContentsCreated(this);
  }
}

RenderFrameHostImpl* WebContentsImpl::GetMainFrame() {
  return frame_tree_.root()->current_frame_host();
}

RenderFrameHostImpl* WebContentsImpl::GetFocusedFrame() {
  FrameTreeNode* focused_node = frame_tree_.GetFocusedFrame();
  if (!focused_node)
    return nullptr;
  return focused_node->current_frame_host();
}

RenderFrameHostImpl* WebContentsImpl::FindFrameByFrameTreeNodeId(
    int frame_tree_node_id,
    int process_id) {
  FrameTreeNode* frame = frame_tree_.FindByID(frame_tree_node_id);

  // Sanity check that this is in the caller's expected process. Otherwise a
  // recent cross-process navigation may have led to a privilege change that the
  // caller is not expecting.
  if (!frame ||
      frame->current_frame_host()->GetProcess()->GetID() != process_id)
    return nullptr;

  return frame->current_frame_host();
}

RenderFrameHostImpl* WebContentsImpl::UnsafeFindFrameByFrameTreeNodeId(
    int frame_tree_node_id) {
  // Beware using this! The RenderFrameHost may have changed since the caller
  // obtained frame_tree_node_id.
  FrameTreeNode* frame = frame_tree_.FindByID(frame_tree_node_id);
  return frame ? frame->current_frame_host() : nullptr;
}

void WebContentsImpl::ForEachFrame(
    const base::RepeatingCallback<void(RenderFrameHost*)>& on_frame) {
  for (FrameTreeNode* node : frame_tree_.Nodes()) {
    on_frame.Run(node->current_frame_host());
  }
}

std::vector<RenderFrameHost*> WebContentsImpl::GetAllFrames() {
  std::vector<RenderFrameHost*> frame_hosts;
  for (FrameTreeNode* node : frame_tree_.Nodes())
    frame_hosts.push_back(node->current_frame_host());
  return frame_hosts;
}

int WebContentsImpl::SendToAllFrames(IPC::Message* message) {
  int number_of_messages = 0;
  for (RenderFrameHost* rfh : GetAllFrames()) {
    if (!rfh->IsRenderFrameLive())
      continue;

    ++number_of_messages;
    IPC::Message* message_copy = new IPC::Message(*message);
    message_copy->set_routing_id(rfh->GetRoutingID());
    rfh->Send(message_copy);
  }
  delete message;
  return number_of_messages;
}

void WebContentsImpl::SendPageMessage(IPC::Message* msg) {
  frame_tree_.root()->render_manager()->SendPageMessage(msg, nullptr);
}

RenderViewHostImpl* WebContentsImpl::GetRenderViewHost() {
  return GetRenderManager()->current_host();
}

void WebContentsImpl::CancelActiveAndPendingDialogs() {
  if (dialog_manager_) {
    dialog_manager_->CancelDialogs(this, /*reset_state=*/false);
  }
  if (browser_plugin_embedder_)
    browser_plugin_embedder_->CancelGuestDialogs();
}

void WebContentsImpl::ClosePage() {
  GetRenderViewHost()->ClosePage();
}

RenderWidgetHostView* WebContentsImpl::GetRenderWidgetHostView() {
  return GetRenderManager()->GetRenderWidgetHostView();
}

RenderWidgetHostView* WebContentsImpl::GetTopLevelRenderWidgetHostView() {
  if (GetOuterWebContents())
    return GetOuterWebContents()->GetTopLevelRenderWidgetHostView();
  return GetRenderManager()->GetRenderWidgetHostView();
}

RenderWidgetHostView* WebContentsImpl::GetFullscreenRenderWidgetHostView() {
  if (auto* widget_host = GetFullscreenRenderWidgetHost())
    return widget_host->GetView();
  return nullptr;
}

WebContentsView* WebContentsImpl::GetView() const {
  return view_.get();
}

void WebContentsImpl::OnScreenOrientationChange() {
  DCHECK(screen_orientation_provider_);
  screen_orientation_provider_->OnOrientationChange();
}

base::Optional<SkColor> WebContentsImpl::GetThemeColor() {
  return theme_color_;
}

void WebContentsImpl::SetAccessibilityMode(ui::AXMode mode) {
  if (mode == accessibility_mode_)
    return;

  // Don't allow accessibility to be enabled for WebContents that are never
  // visible, like background pages.
  if (IsNeverVisible())
    return;

  accessibility_mode_ = mode;

  for (FrameTreeNode* node : frame_tree_.Nodes()) {
    UpdateAccessibilityModeOnFrame(node->current_frame_host());
    // Also update accessibility mode on the speculative RenderFrameHost for
    // this FrameTreeNode, if one exists.
    RenderFrameHost* speculative_frame_host =
        node->render_manager()->speculative_frame_host();
    if (speculative_frame_host)
      UpdateAccessibilityModeOnFrame(speculative_frame_host);
  }
}

void WebContentsImpl::AddAccessibilityMode(ui::AXMode mode) {
  ui::AXMode new_mode(accessibility_mode_);
  new_mode |= mode;
  SetAccessibilityMode(new_mode);
}

// Helper class used by WebContentsImpl::RequestAXTreeSnapshot.
// Handles the callbacks from parallel snapshot requests to each frame,
// and feeds the results to an AXTreeCombiner, which converts them into a
// single combined accessibility tree.
class WebContentsImpl::AXTreeSnapshotCombiner
    : public base::RefCounted<AXTreeSnapshotCombiner> {
 public:
  explicit AXTreeSnapshotCombiner(AXTreeSnapshotCallback callback)
      : callback_(std::move(callback)) {}

  AXTreeSnapshotCallback AddFrame(bool is_root) {
    // Adds a reference to |this|.
    return base::BindOnce(&AXTreeSnapshotCombiner::ReceiveSnapshot, this,
                          is_root);
  }

  void ReceiveSnapshot(bool is_root, const ui::AXTreeUpdate& snapshot) {
    combiner_.AddTree(snapshot, is_root);
  }

 private:
  friend class base::RefCounted<AXTreeSnapshotCombiner>;

  // This is called automatically after the last call to ReceiveSnapshot
  // when there are no more references to this object.
  ~AXTreeSnapshotCombiner() {
    combiner_.Combine();
    std::move(callback_).Run(combiner_.combined());
  }

  ui::AXTreeCombiner combiner_;
  AXTreeSnapshotCallback callback_;
};

void WebContentsImpl::RequestAXTreeSnapshot(AXTreeSnapshotCallback callback,
                                            ui::AXMode ax_mode) {
  // Send a request to each of the frames in parallel. Each one will return
  // an accessibility tree snapshot, and AXTreeSnapshotCombiner will combine
  // them into a single tree and call |callback| with that result, then
  // delete |combiner|.
  FrameTreeNode* root_node = frame_tree_.root();
  auto combiner =
      base::MakeRefCounted<AXTreeSnapshotCombiner>(std::move(callback));

  RecursiveRequestAXTreeSnapshotOnFrame(root_node, combiner.get(), ax_mode);
}

void WebContentsImpl::RecursiveRequestAXTreeSnapshotOnFrame(
    FrameTreeNode* root_node,
    AXTreeSnapshotCombiner* combiner,
    ui::AXMode ax_mode) {
  for (FrameTreeNode* frame_tree_node : frame_tree_.Nodes()) {
    WebContentsImpl* inner_contents =
        node_.GetInnerWebContentsInFrame(frame_tree_node);
    if (inner_contents) {
      inner_contents->RecursiveRequestAXTreeSnapshotOnFrame(root_node, combiner,
                                                            ax_mode);
    } else {
      bool is_root = frame_tree_node == root_node;
      frame_tree_node->current_frame_host()->RequestAXTreeSnapshot(
          combiner->AddFrame(is_root), ax_mode);
    }
  }
}

void WebContentsImpl::NotifyViewportFitChanged(
    blink::mojom::ViewportFit value) {
  for (auto& observer : observers_)
    observer.ViewportFitChanged(value);
}

FindRequestManager* WebContentsImpl::GetFindRequestManagerForTesting() {
  return GetFindRequestManager();
}

#if !defined(OS_ANDROID)
void WebContentsImpl::UpdateZoom() {
  RenderWidgetHostImpl* rwh = GetRenderViewHost()->GetWidget();
  if (rwh->GetView())
    rwh->SynchronizeVisualProperties();
}


void WebContentsImpl::UpdateZoomIfNecessary(const std::string& scheme,
                                            const std::string& host) {
  NavigationEntry* entry = GetController().GetLastCommittedEntry();
  if (!entry)
    return;

  GURL url = HostZoomMap::GetURLFromEntry(entry);
  if (host != net::GetHostOrSpecFromURL(url) ||
      (!scheme.empty() && !url.SchemeIs(scheme))) {
    return;
  }

  UpdateZoom();
}
#endif  // !defined(OS_ANDROID)

base::Closure WebContentsImpl::AddBindingSet(
    const std::string& interface_name,
    WebContentsBindingSet* binding_set) {
  auto result =
      binding_sets_.insert(std::make_pair(interface_name, binding_set));
  DCHECK(result.second);
  return base::Bind(&WebContentsImpl::RemoveBindingSet,
                    weak_factory_.GetWeakPtr(), interface_name);
}

WebContentsBindingSet* WebContentsImpl::GetBindingSet(
    const std::string& interface_name) {
  auto it = binding_sets_.find(interface_name);
  if (it == binding_sets_.end())
    return nullptr;
  return it->second;
}

std::vector<WebContentsImpl*> WebContentsImpl::GetWebContentsAndAllInner() {
  std::vector<WebContentsImpl*> all_contents(1, this);

  for (size_t i = 0; i != all_contents.size(); ++i) {
    for (auto* inner_contents : all_contents[i]->GetInnerWebContents()) {
      all_contents.push_back(static_cast<WebContentsImpl*>(inner_contents));
    }
  }

  return all_contents;
}

void WebContentsImpl::NotifyManifestUrlChanged(
    const base::Optional<GURL>& manifest_url) {
  for (auto& observer : observers_)
    observer.DidUpdateWebManifestURL(manifest_url);
}

WebUI* WebContentsImpl::GetWebUI() {
  WebUI* commited_web_ui = GetCommittedWebUI();
  return commited_web_ui ? commited_web_ui
                         : GetRenderManager()->GetNavigatingWebUI();
}

WebUI* WebContentsImpl::GetCommittedWebUI() {
  return frame_tree_.root()->current_frame_host()->web_ui();
}

void WebContentsImpl::SetUserAgentOverride(const std::string& override,
                                           bool override_in_new_tabs) {
  if (GetUserAgentOverride() == override)
    return;

  should_override_user_agent_in_new_tabs_ = override_in_new_tabs;

  renderer_preferences_.user_agent_override = override;

  // Send the new override string to the renderer.
  RenderViewHost* host = GetRenderViewHost();
  if (host)
    host->SyncRendererPrefs();

  // Reload the page if a load is currently in progress to avoid having
  // different parts of the page loaded using different user agents.
  NavigationEntry* entry = controller_.GetVisibleEntry();
  if (IsLoading() && entry != nullptr && entry->GetIsOverridingUserAgent())
    controller_.Reload(ReloadType::BYPASSING_CACHE, true);

  for (auto& observer : observers_)
    observer.UserAgentOverrideSet(override);
}

const std::string& WebContentsImpl::GetUserAgentOverride() {
  return renderer_preferences_.user_agent_override;
}

bool WebContentsImpl::ShouldOverrideUserAgentInNewTabs() {
  return should_override_user_agent_in_new_tabs_;
}

void WebContentsImpl::EnableWebContentsOnlyAccessibilityMode() {
  // If accessibility is already enabled, we'll need to force a reset
  // in order to ensure new observers of accessibility events get the
  // full accessibility tree from scratch.
  bool need_reset = GetAccessibilityMode().has_mode(ui::AXMode::kWebContents);

  ui::AXMode desired_mode =
      GetContentClient()->browser()->GetAXModeForBrowserContext(
          GetBrowserContext());
  desired_mode |= ui::kAXModeWebContentsOnly;
  AddAccessibilityMode(desired_mode);

  if (need_reset) {
    for (RenderFrameHost* rfh : GetAllFrames())
      ResetAccessibility(rfh);
  }
}

bool WebContentsImpl::IsWebContentsOnlyAccessibilityModeForTesting() {
  return accessibility_mode_ == ui::kAXModeWebContentsOnly;
}

bool WebContentsImpl::IsFullAccessibilityModeForTesting() {
  return accessibility_mode_ == ui::kAXModeComplete;
}

const PageImportanceSignals& WebContentsImpl::GetPageImportanceSignals() {
  return page_importance_signals_;
}

const std::string& WebContentsImpl::GetMediaDeviceGroupIDSaltBase() const {
  return media_device_group_id_salt_base_;
}

#if defined(OS_ANDROID)

void WebContentsImpl::SetDisplayCutoutSafeArea(gfx::Insets insets) {
  if (display_cutout_host_impl_)
    display_cutout_host_impl_->SetDisplayCutoutSafeArea(insets);
}

#endif

const base::string16& WebContentsImpl::GetTitle() {
  // Transient entries take precedence. They are used for interstitial pages
  // that are shown on top of existing pages.
  NavigationEntry* entry = controller_.GetTransientEntry();
  if (entry) {
    return entry->GetTitleForDisplay();
  }

  WebUI* navigating_web_ui = GetRenderManager()->GetNavigatingWebUI();
  WebUI* our_web_ui = navigating_web_ui
                          ? navigating_web_ui
                          : GetRenderManager()->current_frame_host()->web_ui();

  if (our_web_ui) {
    // Don't override the title in view source mode.
    entry = controller_.GetVisibleEntry();
    if (!(entry && entry->IsViewSourceMode())) {
      // Give the Web UI the chance to override our title.
      const base::string16& title = our_web_ui->GetOverriddenTitle();
      if (!title.empty())
        return title;
    }
  }

  // We use the title for the last committed entry rather than a pending
  // navigation entry. For example, when the user types in a URL, we want to
  // keep the old page's title until the new load has committed and we get a new
  // title.
  entry = controller_.GetLastCommittedEntry();

  // We make an exception for initial navigations. We only want to use the title
  // from the visible entry if:
  // 1. The pending entry has been explicitly assigned a title to display.
  // 2. The user is doing a history navigation in a new tab (e.g., Ctrl+Back),
  //    which case there is a pending entry index other than -1.
  //
  // Otherwise, we want to stick with the last committed entry's title during
  // new navigations, which have pending entries at index -1 with no title.
  if (controller_.IsInitialNavigation() &&
      ((controller_.GetVisibleEntry() &&
        !controller_.GetVisibleEntry()->GetTitle().empty()) ||
       controller_.GetPendingEntryIndex() != -1)) {
    entry = controller_.GetVisibleEntry();
  }

  if (entry) {
    return entry->GetTitleForDisplay();
  }

  // |page_title_when_no_navigation_entry_| is finally used
  // if no title cannot be retrieved.
  return page_title_when_no_navigation_entry_;
}

SiteInstanceImpl* WebContentsImpl::GetSiteInstance() {
  return GetRenderManager()->current_host()->GetSiteInstance();
}

bool WebContentsImpl::IsLoading() {
  return frame_tree_.IsLoading() &&
         !(ShowingInterstitialPage() && interstitial_page_->pause_throbber());
}

double WebContentsImpl::GetLoadProgress() {
  return frame_tree_.load_progress();
}

bool WebContentsImpl::IsLoadingToDifferentDocument() {
  return IsLoading() && is_load_to_different_document_;
}

bool WebContentsImpl::IsWaitingForResponse() {
  NavigationRequest* ongoing_navigation_request =
      frame_tree_.root()->navigation_request();

  // An ongoing navigation request means we're waiting for a response.
  return ongoing_navigation_request != nullptr;
}

const net::LoadStateWithParam& WebContentsImpl::GetLoadState() {
  return load_state_;
}

const base::string16& WebContentsImpl::GetLoadStateHost() {
  return load_state_host_;
}

uint64_t WebContentsImpl::GetUploadSize() {
  return upload_size_;
}

uint64_t WebContentsImpl::GetUploadPosition() {
  return upload_position_;
}

const std::string& WebContentsImpl::GetEncoding() {
  return canonical_encoding_;
}

bool WebContentsImpl::WasDiscarded() {
  return GetFrameTree()->root()->was_discarded();
}

void WebContentsImpl::SetWasDiscarded(bool was_discarded) {
  GetFrameTree()->root()->set_was_discarded();
}

void WebContentsImpl::IncrementCapturerCount(const gfx::Size& capture_size) {
  DCHECK(!is_being_destroyed_);
  const bool was_captured = IsBeingCaptured();
  ++capturer_count_;
  DVLOG(1) << "There are now " << capturer_count_
           << " capturing(s) of WebContentsImpl@" << this;

  // Note: This provides a hint to upstream code to size the views optimally
  // for quality (e.g., to avoid scaling).
  if (!capture_size.IsEmpty() && preferred_size_for_capture_.IsEmpty()) {
    preferred_size_for_capture_ = capture_size;
    OnPreferredSizeChanged(preferred_size_);
  }

  if (GetVisibility() != Visibility::VISIBLE && !was_captured) {
    // Ensure that all views act as if they were visible before capture begins.
    // TODO(fdoray): Replace RenderWidgetHostView::WasUnOccluded() with a method
    // to explicitly notify the RenderWidgetHostView that capture began.
    // https://crbug.com/668690
    if (auto* main_view = GetRenderWidgetHostView())
      main_view->WasUnOccluded();
    if (!ShowingInterstitialPage())
      SetVisibilityForChildViews(true);
  }
}

void WebContentsImpl::DecrementCapturerCount() {
  --capturer_count_;
  DVLOG(1) << "There are now " << capturer_count_
           << " capturing(s) of WebContentsImpl@" << this;
  DCHECK_LE(0, capturer_count_);

  if (is_being_destroyed_)
    return;

  if (!IsBeingCaptured()) {
    const gfx::Size old_size = preferred_size_for_capture_;
    preferred_size_for_capture_ = gfx::Size();
    OnPreferredSizeChanged(old_size);

    if (visibility_ == Visibility::HIDDEN) {
      DVLOG(1) << "Executing delayed WasHidden().";
      WasHidden();
    } else if (visibility_ == Visibility::OCCLUDED) {
      WasOccluded();
    }
  }
}

bool WebContentsImpl::IsBeingCaptured() {
  return capturer_count_ > 0;
}

bool WebContentsImpl::IsAudioMuted() {
  if (base::FeatureList::IsEnabled(features::kAudioServiceAudioStreams)) {
    return audio_stream_factory_ && audio_stream_factory_->IsMuted();
  }
  return audio_muter_.get() && audio_muter_->is_muting();
}

void WebContentsImpl::SetAudioMuted(bool mute) {
  DVLOG(1) << "SetAudioMuted(mute=" << mute << "), was " << IsAudioMuted()
           << " for WebContentsImpl@" << this;

  if (mute == IsAudioMuted())
    return;

  if (base::FeatureList::IsEnabled(features::kAudioServiceAudioStreams)) {
    GetAudioStreamFactory()->SetMuted(mute);
  } else {
    if (mute) {
      if (!audio_muter_)
        audio_muter_.reset(new WebContentsAudioMuter(this));
      audio_muter_->StartMuting();
    } else {
      DCHECK(audio_muter_);
      audio_muter_->StopMuting();
    }
  }

  for (auto& observer : observers_)
    observer.DidUpdateAudioMutingState(mute);

  // Notification for UI updates in response to the changed muting state.
  NotifyNavigationStateChanged(INVALIDATE_TYPE_TAB);
}

bool WebContentsImpl::IsCurrentlyAudible() {
  return is_currently_audible_;
}

bool WebContentsImpl::IsConnectedToBluetoothDevice() {
  return bluetooth_connected_device_count_ > 0;
}

bool WebContentsImpl::IsConnectedToSerialPort() {
  return serial_active_frame_count_ > 0;
}

bool WebContentsImpl::HasNativeFileSystemDirectoryHandles() {
  return !native_file_system_directory_handles_.empty();
}

std::vector<base::FilePath>
WebContentsImpl::GetNativeFileSystemDirectoryHandles() {
  std::vector<base::FilePath> result;
  result.reserve(native_file_system_directory_handles_.size());
  for (auto const& entry : native_file_system_directory_handles_)
    result.push_back(entry.first);
  return result;
}

bool WebContentsImpl::HasWritableNativeFileSystemHandles() {
  return native_file_system_writable_handle_count_ > 0;
}

bool WebContentsImpl::HasPictureInPictureVideo() {
  return has_picture_in_picture_video_;
}

void WebContentsImpl::SetHasPictureInPictureVideo(
    bool has_picture_in_picture_video) {
  // If status of |this| is already accurate, there is no need to update.
  if (has_picture_in_picture_video == has_picture_in_picture_video_)
    return;
  has_picture_in_picture_video_ = has_picture_in_picture_video;
  NotifyNavigationStateChanged(INVALIDATE_TYPE_TAB);
  for (auto& observer : observers_)
    observer.MediaPictureInPictureChanged(has_picture_in_picture_video_);
}

bool WebContentsImpl::IsCrashed() {
  switch (crashed_status_) {
    case base::TERMINATION_STATUS_PROCESS_CRASHED:
    case base::TERMINATION_STATUS_ABNORMAL_TERMINATION:
    case base::TERMINATION_STATUS_PROCESS_WAS_KILLED:
    case base::TERMINATION_STATUS_OOM:
    case base::TERMINATION_STATUS_LAUNCH_FAILED:
#if defined(OS_CHROMEOS)
    case base::TERMINATION_STATUS_PROCESS_WAS_KILLED_BY_OOM:
#endif
#if defined(OS_ANDROID)
    case base::TERMINATION_STATUS_OOM_PROTECTED:
#endif
      return true;
    case base::TERMINATION_STATUS_NORMAL_TERMINATION:
    case base::TERMINATION_STATUS_STILL_RUNNING:
      return false;
    case base::TERMINATION_STATUS_MAX_ENUM:
      NOTREACHED();
      return false;
  }

  NOTREACHED();
  return false;
}

void WebContentsImpl::SetIsCrashed(base::TerminationStatus status,
                                   int error_code) {
  if (status == crashed_status_)
    return;

  crashed_status_ = status;
  crashed_error_code_ = error_code;
  NotifyNavigationStateChanged(INVALIDATE_TYPE_TAB);
}

base::TerminationStatus WebContentsImpl::GetCrashedStatus() {
  return crashed_status_;
}

int WebContentsImpl::GetCrashedErrorCode() {
  return crashed_error_code_;
}

bool WebContentsImpl::IsBeingDestroyed() {
  return is_being_destroyed_;
}

void WebContentsImpl::NotifyNavigationStateChanged(
    InvalidateTypes changed_flags) {
  // Notify the media observer of potential audibility changes.
  if (changed_flags & INVALIDATE_TYPE_TAB) {
    media_web_contents_observer_->MaybeUpdateAudibleState();
  }

  if (delegate_)
    delegate_->NavigationStateChanged(this, changed_flags);

  if (GetOuterWebContents())
    GetOuterWebContents()->NotifyNavigationStateChanged(changed_flags);
}

void WebContentsImpl::NotifyVisibleViewportSizeChanged(
    const gfx::Size& visible_viewport_size) {
  SendPageMessage(new PageMsg_UpdatePageVisualProperties(
      MSG_ROUTING_NONE, visible_viewport_size));
}

RenderFrameHostImpl* WebContentsImpl::GetFocusedFrameFromFocusedDelegate() {
  FrameTreeNode* focused_node =
      GetFocusedWebContents()->frame_tree_.GetFocusedFrame();
  return focused_node ? focused_node->current_frame_host() : nullptr;
}

void WebContentsImpl::OnAudioStateChanged() {
  // This notification can come from any embedded contents or from this
  // WebContents' stream monitor. Aggregate these signals to get the actual
  // state.
  bool is_currently_audible =
      audio_stream_monitor_.IsCurrentlyAudible() ||
      (browser_plugin_embedder_ &&
       browser_plugin_embedder_->AreAnyGuestsCurrentlyAudible());
  if (is_currently_audible == is_currently_audible_)
    return;

  // Update internal state.
  is_currently_audible_ = is_currently_audible;
  was_ever_audible_ = was_ever_audible_ || is_currently_audible_;

  SendPageMessage(
      new PageMsg_AudioStateChanged(MSG_ROUTING_NONE, is_currently_audible_));

  // Notification for UI updates in response to the changed audio state.
  NotifyNavigationStateChanged(INVALIDATE_TYPE_TAB);

  // Ensure that audio state changes propagate from innermost to outermost
  // WebContents.
  if (GetOuterWebContents())
    GetOuterWebContents()->OnAudioStateChanged();

  for (auto& observer : observers_)
    observer.OnAudioStateChanged(is_currently_audible_);
}

base::TimeTicks WebContentsImpl::GetLastActiveTime() {
  return last_active_time_;
}

void WebContentsImpl::WasShown() {
  controller_.SetActive(true);

  // This shows the Page before showing the individual RenderWidgets, as
  // RenderWidgets will work to produce compositor frames and handle input
  // as soon as they are shown. But the Page and other classes do not expect to
  // be producing frames when the Page is hidden. So we make sure the Page is
  // shown first.
  SendPageMessage(new PageMsg_WasShown(MSG_ROUTING_NONE));

  if (auto* view = GetRenderWidgetHostView()) {
    view->Show();
#if defined(OS_MACOSX)
    view->SetActive(true);
#endif
  }

  if (!ShowingInterstitialPage())
    SetVisibilityForChildViews(true);

  last_active_time_ = base::TimeTicks::Now();
  SetVisibility(Visibility::VISIBLE);

  for (FrameTreeNode* node : frame_tree_.Nodes()) {
    RenderFrameProxyHost* parent = node->render_manager()->GetProxyToParent();
    if (!parent)
      continue;

    parent->cross_process_frame_connector()->DelegateWasShown();
  }
}

void WebContentsImpl::WasHidden() {
  // If there are entities capturing screenshots or video (e.g. mirroring),
  // or in Picture-in-Picture mode, don't activate the "disable rendering"
  // optimization.
  if (!IsBeingCaptured() && !HasPictureInPictureVideo()) {
    // This hides the individual RenderWidgets before hiding the Page, as
    // RenderWidgets will work to produce compositor frames and handle input
    // until they are hidden. But the Page and other classes do not expect to
    // be producing frames when the Page is hidden. So we stop the widgets,
    // then hide the Page.
    //
    // |GetRenderViewHost()| can be NULL if the user middle clicks a link to
    // open a tab in the background, then closes the tab before selecting it.
    // This is because closing the tab calls WebContentsImpl::Destroy(), which
    // removes the |GetRenderViewHost()|; then when we actually destroy the
    // window, OnWindowPosChanged() notices and calls WasHidden() (which
    // calls us).
    if (auto* view = GetRenderWidgetHostView())
      view->Hide();

    if (!ShowingInterstitialPage())
      SetVisibilityForChildViews(false);
  }

  // Inform the renderer that the page was hidden if there are no entities
  // capturing screenshots or video (e.g. mirroring).
  if (!IsBeingCaptured())
    SendPageMessage(new PageMsg_WasHidden(MSG_ROUTING_NONE));

  SetVisibility(Visibility::HIDDEN);
}

bool WebContentsImpl::HasRecentInteractiveInputEvent() {
  static constexpr base::TimeDelta kMaxInterval =
      base::TimeDelta::FromSeconds(5);
  base::TimeDelta delta =
      ui::EventTimeForNow() - last_interactive_input_event_time_;
  // Note: the expectation is that the caller is typically expecting an input
  // event, e.g. validating that a WebUI message that requires a gesture is
  // actually attached to a gesture. Logging to UMA here should hopefully give
  // sufficient data if 5 seconds is actually sufficient (or even too high a
  // threshhold).
  UMA_HISTOGRAM_TIMES("Tabs.TimeSinceLastInteraction", delta);
  return delta <= kMaxInterval;
}

void WebContentsImpl::SetIgnoreInputEvents(bool ignore_input_events) {
  ignore_input_events_ = ignore_input_events;
}

#if defined(OS_ANDROID)
void WebContentsImpl::SetMainFrameImportance(
    ChildProcessImportance importance) {
  GetMainFrame()->GetRenderWidgetHost()->SetImportance(importance);
  if (ShowingInterstitialPage()) {
    static_cast<RenderFrameHostImpl*>(interstitial_page_->GetMainFrame())
        ->GetRenderWidgetHost()
        ->SetImportance(importance);
  }
}
#endif

void WebContentsImpl::WasOccluded() {
  // If there are entities capturing screenshots or video (e.g. mirroring),
  // or in Picture-in-Picture mode, don't activate the "disable rendering"
  // optimization.
  if (!IsBeingCaptured() && !HasPictureInPictureVideo()) {
    if (auto* main_view = GetRenderWidgetHostView())
      main_view->WasOccluded();
    if (!ShowingInterstitialPage()) {
      // Occluding child view is treated as hiding the view
      // (https://crbug.com/903455).
      SetVisibilityForChildViews(false);
    }
  }

  // Inform the renderer that the page was hidden if there are no entities
  // capturing screenshots or video (e.g. mirroring).
  if (!IsBeingCaptured())
    SendPageMessage(new PageMsg_WasHidden(MSG_ROUTING_NONE));

  SetVisibility(Visibility::OCCLUDED);
}

Visibility WebContentsImpl::GetVisibility() {
  return visibility_;
}

// TODO(alexmos): rename to NeedToFireBeforeUnloadOrUnload().
bool WebContentsImpl::NeedToFireBeforeUnload() {
  // TODO(creis): Should we fire even for interstitial pages?
  if (ShowingInterstitialPage())
    return false;

  if (!WillNotifyDisconnection())
    return false;

  // Don't fire if the main frame's RenderViewHost indicates that beforeunload
  // and unload have already executed (e.g., after receiving a ClosePage ACK)
  // or should be ignored.
  if (GetRenderViewHost()->SuddenTerminationAllowed())
    return false;

  // Check whether the main frame needs to run beforeunload or unload handlers.
  if (GetMainFrame()->GetSuddenTerminationDisablerState(
          blink::kBeforeUnloadHandler | blink::kUnloadHandler)) {
    return true;
  }

  // Check whether any subframes need to run beforeunload handlers.
  //
  // TODO(alexmos): Also check whether subframes need to run unload handlers in
  // addition to beforeunload.
  return GetMainFrame()->ShouldDispatchBeforeUnload(
      true /* check_subframes_only */);
}

void WebContentsImpl::DispatchBeforeUnload(bool auto_cancel) {
  auto before_unload_type =
      auto_cancel ? RenderFrameHostImpl::BeforeUnloadType::DISCARD
                  : RenderFrameHostImpl::BeforeUnloadType::TAB_CLOSE;
  GetMainFrame()->DispatchBeforeUnload(before_unload_type, false);
}

void WebContentsImpl::AttachInnerWebContents(
    std::unique_ptr<WebContents> inner_web_contents,
    RenderFrameHost* render_frame_host) {
  WebContentsImpl* inner_web_contents_impl =
      static_cast<WebContentsImpl*>(inner_web_contents.get());
  DCHECK(!inner_web_contents_impl->node_.outer_web_contents());
  auto* render_frame_host_impl =
      static_cast<RenderFrameHostImpl*>(render_frame_host);
  DCHECK_EQ(&frame_tree_,
            render_frame_host_impl->frame_tree_node()->frame_tree());

  RenderFrameHostManager* inner_render_manager =
      inner_web_contents_impl->GetRenderManager();
  RenderFrameHostImpl* inner_main_frame =
      inner_render_manager->current_frame_host();
  RenderViewHostImpl* inner_render_view_host =
      inner_render_manager->current_host();
  auto* outer_render_manager =
      render_frame_host_impl->frame_tree_node()->render_manager();

  // When attaching a WebContents as an inner WebContents, we need to replace
  // the Webcontents' view with a WebContentsViewChildFrame.
  inner_web_contents_impl->view_.reset(new WebContentsViewChildFrame(
      inner_web_contents_impl,
      GetContentClient()->browser()->GetWebContentsViewDelegate(
          inner_web_contents_impl),
      &inner_web_contents_impl->render_view_host_delegate_view_));

  // When the WebContents being initialized has an opener, the  browser side
  // Render{View,Frame}Host must be initialized and the RenderWidgetHostView
  // created. This is needed because the usual initialization happens during
  // the first navigation, but when attaching a new window we don't navigate
  // before attaching. If the browser side is already initialized, the calls
  // below will just early return.
  inner_render_manager->InitRenderView(inner_render_view_host, nullptr);
  inner_main_frame->Init();
  if (!inner_render_manager->GetRenderWidgetHostView()) {
    inner_web_contents_impl->CreateRenderWidgetHostViewForRenderManager(
        inner_render_view_host);
  }

  // Create a link to our outer WebContents.
  node_.AttachInnerWebContents(std::move(inner_web_contents),
                               render_frame_host_impl);

  // Create a proxy in top-level RenderFrameHostManager, pointing to the
  // SiteInstance of the outer WebContents. The proxy will be used to send
  // postMessage to the inner WebContents.
  auto* proxy = inner_render_manager->CreateOuterDelegateProxy(
      render_frame_host_impl->GetSiteInstance());

  // When attaching a GuestView as an inner WebContents, there should already be
  // a live RenderFrame, which has to be swapped. When attaching a portal, there
  // will not be a live RenderFrame before creating the proxy.
  if (render_frame_host_impl->IsRenderFrameLive()) {
    inner_render_manager->SwapOuterDelegateFrame(render_frame_host_impl, proxy);

    inner_web_contents_impl->ReattachToOuterWebContentsFrame();
  }

  if (frame_tree_.GetFocusedFrame() ==
      render_frame_host_impl->frame_tree_node()) {
    inner_web_contents_impl->SetFocusedFrame(
        inner_web_contents_impl->frame_tree_.root(),
        render_frame_host_impl->GetSiteInstance());
  }
  outer_render_manager->set_attach_complete();
}

std::unique_ptr<WebContents> WebContentsImpl::DetachFromOuterWebContents() {
  DCHECK(node_.outer_web_contents());
  if (RenderWidgetHostViewBase* view =
          static_cast<RenderWidgetHostViewBase*>(GetMainFrame()->GetView())) {
    view->Destroy();
  }
  GetRenderManager()->DeleteOuterDelegateProxy(
      node_.OuterContentsFrameTreeNode()
          ->current_frame_host()
          ->GetSiteInstance());
  view_.reset(CreateWebContentsView(
      this, GetContentClient()->browser()->GetWebContentsViewDelegate(this),
      &render_view_host_delegate_view_));
  view_->CreateView(GetPreferredSize(), nullptr);
  std::unique_ptr<WebContents> web_contents =
      node_.DisconnectFromOuterWebContents();
  DCHECK_EQ(web_contents.get(), this);
  node_.SetFocusedWebContents(this);
  CreateRenderWidgetHostViewForRenderManager(GetRenderViewHost());
  return web_contents;
}

void WebContentsImpl::RecursivelyRegisterFrameSinkIds() {
  auto* view = static_cast<RenderWidgetHostViewBase*>(
      GetRenderManager()->GetRenderWidgetHostView());
  DCHECK(view);
  if (!view->IsRenderWidgetHostViewChildFrame())
    return;
  static_cast<RenderWidgetHostViewChildFrame*>(view)->RegisterFrameSinkId();

  for (auto* inner_web_contents : node_.GetInnerWebContents()) {
    static_cast<WebContentsImpl*>(inner_web_contents)
        ->RecursivelyRegisterFrameSinkIds();
  }
}

void WebContentsImpl::ReattachToOuterWebContentsFrame() {
  DCHECK(node_.outer_web_contents());
  auto* render_manager = GetRenderManager();
  auto* parent_frame =
      node_.OuterContentsFrameTreeNode()->current_frame_host()->GetParent();
  render_manager->SetRWHViewForInnerContents(
      render_manager->GetRenderWidgetHostView());

  RecursivelyRegisterFrameSinkIds();

  // Set up the the guest's AX tree to point back at the embedder's AX tree.
  GetMainFrame()->set_browser_plugin_embedder_ax_tree_id(
      parent_frame->GetAXTreeID());
  GetMainFrame()->UpdateAXTreeData();
}

void WebContentsImpl::DidChangeVisibleSecurityState() {
  if (delegate_)
    delegate_->VisibleSecurityStateChanged(this);
  for (auto& observer : observers_)
    observer.DidChangeVisibleSecurityState();
}

void WebContentsImpl::NotifyPreferencesChanged() {
  std::set<RenderViewHost*> render_view_host_set;
  for (FrameTreeNode* node : frame_tree_.Nodes()) {
    render_view_host_set.insert(
        node->current_frame_host()->GetRenderViewHost());
  }

  for (RenderViewHost* render_view_host : render_view_host_set)
    render_view_host->OnWebkitPreferencesChanged();
}

void WebContentsImpl::Stop() {
  for (FrameTreeNode* node : frame_tree_.Nodes())
    node->StopLoading();
  for (auto& observer : observers_)
    observer.NavigationStopped();
}

void WebContentsImpl::SetPageFrozen(bool frozen) {
  // A visible page is never frozen.
  DCHECK_NE(Visibility::VISIBLE, GetVisibility());

  SendPageMessage(new PageMsg_SetPageFrozen(MSG_ROUTING_NONE, frozen));
}

std::unique_ptr<WebContents> WebContentsImpl::Clone() {
  // We use our current SiteInstance since the cloned entry will use it anyway.
  // We pass our own opener so that the cloned page can access it if it was set
  // before.
  CreateParams create_params(GetBrowserContext(), GetSiteInstance());
  create_params.initial_size = GetContainerBounds().size();
  FrameTreeNode* opener = frame_tree_.root()->opener();
  RenderFrameHostImpl* opener_rfh = nullptr;
  if (opener)
    opener_rfh = opener->current_frame_host();
  std::unique_ptr<WebContentsImpl> tc =
      CreateWithOpener(create_params, opener_rfh);
  tc->GetController().CopyStateFrom(&controller_, true);
  for (auto& observer : observers_)
    observer.DidCloneToNewWebContents(this, tc.get());
  return tc;
}

void WebContentsImpl::Observe(int type,
                              const NotificationSource& source,
                              const NotificationDetails& details) {
  switch (type) {
    case NOTIFICATION_RENDER_WIDGET_HOST_DESTROYED: {
      RenderWidgetHost* host = Source<RenderWidgetHost>(source).ptr();
      RenderWidgetHostView* view = host->GetView();
      if (view == GetFullscreenRenderWidgetHostView()) {
        // We cannot just call view_->RestoreFocus() here.  On some platforms,
        // attempting to focus the currently-invisible WebContentsView will be
        // flat-out ignored.  Therefore, this boolean is used to track whether
        // we will request focus after the fullscreen widget has been
        // destroyed.
        fullscreen_widget_had_focus_at_shutdown_ = (view && view->HasFocus());
      } else {
        for (auto i = pending_widget_views_.begin();
             i != pending_widget_views_.end(); ++i) {
          if (host->GetView() == i->second) {
            pending_widget_views_.erase(i);
            break;
          }
        }
      }
      break;
    }
    default:
      NOTREACHED();
  }
}

WebContents* WebContentsImpl::GetWebContents() {
  return this;
}

void WebContentsImpl::Init(const WebContents::CreateParams& params) {
  // This is set before initializing the render manager since
  // RenderFrameHostManager::Init calls back into us via its delegate to ask if
  // it should be hidden.
  visibility_ =
      params.initially_hidden ? Visibility::HIDDEN : Visibility::VISIBLE;

  if (!params.last_active_time.is_null())
    last_active_time_ = params.last_active_time;

  // The routing ids must either all be set or all be unset.
  DCHECK((params.routing_id == MSG_ROUTING_NONE &&
          params.main_frame_routing_id == MSG_ROUTING_NONE &&
          params.main_frame_widget_routing_id == MSG_ROUTING_NONE) ||
         (params.routing_id != MSG_ROUTING_NONE &&
          params.main_frame_routing_id != MSG_ROUTING_NONE &&
          params.main_frame_widget_routing_id != MSG_ROUTING_NONE));

  scoped_refptr<SiteInstance> site_instance = params.site_instance;
  if (!site_instance)
    site_instance = SiteInstance::Create(params.browser_context);
  if (params.desired_renderer_state == CreateParams::kNoRendererProcess) {
    static_cast<SiteInstanceImpl*>(site_instance.get())
        ->PreventAssociationWithSpareProcess();
  }

  // A main RenderFrameHost always has a RenderWidgetHost, since it is always a
  // local root by definition.
  // TODO(avi): Once RenderViewHostImpl has-a RenderWidgetHostImpl, it will no
  // longer be necessary to eagerly grab a routing ID for the view.
  // https://crbug.com/545684
  int32_t view_routing_id = params.routing_id;
  int32_t main_frame_widget_routing_id = params.main_frame_widget_routing_id;
  if (main_frame_widget_routing_id == MSG_ROUTING_NONE) {
    view_routing_id = site_instance->GetProcess()->GetNextRoutingID();
    main_frame_widget_routing_id =
        site_instance->GetProcess()->GetNextRoutingID();
  }

  DCHECK_NE(view_routing_id, main_frame_widget_routing_id);

  GetRenderManager()->Init(
      site_instance.get(), view_routing_id, params.main_frame_routing_id,
      main_frame_widget_routing_id, params.renderer_initiated_creation);

  // blink::FrameTree::setName always keeps |unique_name| empty in case of a
  // main frame - let's do the same thing here.
  std::string unique_name;
  frame_tree_.root()->SetFrameName(params.main_frame_name, unique_name);

  WebContentsViewDelegate* delegate =
      GetContentClient()->browser()->GetWebContentsViewDelegate(this);

  if (GuestMode::IsCrossProcessFrameGuest(this)) {
    view_.reset(new WebContentsViewChildFrame(
        this, delegate, &render_view_host_delegate_view_));
  } else {
    view_.reset(CreateWebContentsView(this, delegate,
                                      &render_view_host_delegate_view_));
    if (browser_plugin_guest_) {
      view_ = std::make_unique<WebContentsViewGuest>(
          this, browser_plugin_guest_.get(), std::move(view_),
          &render_view_host_delegate_view_);
    }
  }
  CHECK(render_view_host_delegate_view_);
  CHECK(view_.get());

  gfx::Size initial_size = params.initial_size;
  view_->CreateView(initial_size, params.context);

#if BUILDFLAG(ENABLE_PLUGINS)
  plugin_content_origin_whitelist_.reset(
      new PluginContentOriginWhitelist(this));
#endif

  registrar_.Add(this,
                 NOTIFICATION_RENDER_WIDGET_HOST_DESTROYED,
                 NotificationService::AllBrowserContextsAndSources());

  screen_orientation_provider_.reset(new ScreenOrientationProvider(this));

  manifest_manager_host_.reset(new ManifestManagerHost(this));

#if defined(OS_ANDROID)
  date_time_chooser_.reset(new DateTimeChooserAndroid(this));
#endif

  // BrowserPluginGuest::Init needs to be called after this WebContents has
  // a RenderWidgetHostViewGuest. That is, |view_->CreateView| above.
  if (browser_plugin_guest_)
    browser_plugin_guest_->Init();

  for (size_t i = 0; i < g_created_callbacks.Get().size(); i++)
    g_created_callbacks.Get().at(i).Run(this);

  // If the WebContents creation was renderer-initiated, it means that the
  // corresponding RenderView and main RenderFrame have already been created.
  // Ensure observers are notified about this.
  if (params.renderer_initiated_creation) {
    GetRenderViewHost()->GetWidget()->set_renderer_initialized(true);
    GetRenderViewHost()->DispatchRenderViewCreated();
    GetRenderManager()->current_frame_host()->SetRenderFrameCreated(true);
  }

  // Create the renderer process in advance if requested.
  if (params.desired_renderer_state ==
      CreateParams::kInitializeAndWarmupRendererProcess) {
    if (!GetRenderManager()->current_frame_host()->IsRenderFrameLive()) {
      GetRenderManager()->InitRenderView(GetRenderViewHost(), nullptr);
    }
  }

  // Ensure that observers are notified of the creation of this WebContents's
  // main RenderFrameHost. It must be done here for main frames, since the
  // NotifySwappedFromRenderManager expects view_ to already be created and that
  // happens after RenderFrameHostManager::Init.
  NotifySwappedFromRenderManager(
      nullptr, GetRenderManager()->current_frame_host(), true);
}

void WebContentsImpl::OnWebContentsDestroyed(WebContentsImpl* web_contents) {
  RemoveDestructionObserver(web_contents);

  // Clear a pending contents that has been closed before being shown.
  for (auto iter = pending_contents_.begin(); iter != pending_contents_.end();
       ++iter) {
    if (iter->second.get() != web_contents)
      continue;

    // Someone else has deleted the WebContents. That should never happen!
    // TODO(erikchen): Fix semantics here. https://crbug.com/832879.
    iter->second.release();
    pending_contents_.erase(iter);
    return;
  }
  NOTREACHED();
}

void WebContentsImpl::AddDestructionObserver(WebContentsImpl* web_contents) {
  if (!base::Contains(destruction_observers_, web_contents)) {
    destruction_observers_[web_contents] =
        std::make_unique<DestructionObserver>(this, web_contents);
  }
}

void WebContentsImpl::RemoveDestructionObserver(WebContentsImpl* web_contents) {
  destruction_observers_.erase(web_contents);
}

void WebContentsImpl::AddObserver(WebContentsObserver* observer) {
  observers_.AddObserver(observer);
}

void WebContentsImpl::RemoveObserver(WebContentsObserver* observer) {
  observers_.RemoveObserver(observer);
}

std::set<RenderWidgetHostView*>
WebContentsImpl::GetRenderWidgetHostViewsInTree() {
  std::set<RenderWidgetHostView*> set;
  if (ShowingInterstitialPage()) {
    if (RenderWidgetHostView* rwhv = GetRenderWidgetHostView())
      set.insert(rwhv);
  } else {
    for (RenderFrameHost* rfh : GetAllFrames()) {
      if (RenderWidgetHostView* rwhv = static_cast<RenderFrameHostImpl*>(rfh)
                                           ->frame_tree_node()
                                           ->render_manager()
                                           ->GetRenderWidgetHostView()) {
        set.insert(rwhv);
      }
    }
  }
  return set;
}

void WebContentsImpl::Activate() {
  if (delegate_)
    delegate_->ActivateContents(this);
}

void WebContentsImpl::LostCapture(RenderWidgetHostImpl* render_widget_host) {
  if (!RenderViewHostImpl::From(render_widget_host))
    return;

  if (delegate_)
    delegate_->LostCapture();
}

ukm::SourceId WebContentsImpl::GetUkmSourceIdForLastCommittedSource() const {
  return last_committed_source_id_;
}

void WebContentsImpl::SetTopControlsShownRatio(
    RenderWidgetHostImpl* render_widget_host,
    float ratio) {
  if (!delegate_)
    return;

  RenderFrameHostImpl* rfh = GetMainFrame();
  if (!rfh || render_widget_host != rfh->GetRenderWidgetHost())
    return;

  delegate_->SetTopControlsShownRatio(this, ratio);
}

void WebContentsImpl::SetTopControlsGestureScrollInProgress(bool in_progress) {
  if (delegate_)
    delegate_->SetTopControlsGestureScrollInProgress(in_progress);
}

void WebContentsImpl::RenderWidgetCreated(
    RenderWidgetHostImpl* render_widget_host) {
  created_widgets_.insert(render_widget_host);
}

void WebContentsImpl::RenderWidgetDeleted(
    RenderWidgetHostImpl* render_widget_host) {
  // Note that |is_being_destroyed_| can be true at this point as
  // ~WebContentsImpl() calls RFHM::ClearRFHsPendingShutdown(), which might lead
  // us here.
  created_widgets_.erase(render_widget_host);

  if (is_being_destroyed_)
    return;

  if (render_widget_host &&
      render_widget_host->GetRoutingID() == fullscreen_widget_routing_id_ &&
      render_widget_host->GetProcess()->GetID() ==
          fullscreen_widget_process_id_) {
    if (delegate_ && delegate_->EmbedsFullscreenWidget())
      delegate_->ExitFullscreenModeForTab(this);
    for (auto& observer : observers_)
      observer.DidDestroyFullscreenWidget();
    fullscreen_widget_process_id_ = ChildProcessHost::kInvalidUniqueID;
    fullscreen_widget_routing_id_ = MSG_ROUTING_NONE;
    if (fullscreen_widget_had_focus_at_shutdown_)
      view_->RestoreFocus();
  }

  if (render_widget_host == mouse_lock_widget_)
    LostMouseLock(mouse_lock_widget_);

  CancelKeyboardLock(render_widget_host);
}

void WebContentsImpl::RenderWidgetGotFocus(
    RenderWidgetHostImpl* render_widget_host) {
  // Notify the observers if an embedded fullscreen widget was focused.
  if (delegate_ && render_widget_host && delegate_->EmbedsFullscreenWidget() &&
      render_widget_host->GetView() == GetFullscreenRenderWidgetHostView()) {
    NotifyWebContentsFocused(render_widget_host);
  }
}

void WebContentsImpl::RenderWidgetLostFocus(
    RenderWidgetHostImpl* render_widget_host) {
  // Notify the observers if an embedded fullscreen widget lost focus.
  if (delegate_ && render_widget_host && delegate_->EmbedsFullscreenWidget() &&
      render_widget_host->GetView() == GetFullscreenRenderWidgetHostView()) {
    NotifyWebContentsLostFocus(render_widget_host);
  }
}

void WebContentsImpl::RenderWidgetWasResized(
    RenderWidgetHostImpl* render_widget_host,
    const ScreenInfo& screen_info,
    bool width_changed) {
  RenderFrameHostImpl* rfh = GetMainFrame();
  if (!rfh || render_widget_host != rfh->GetRenderWidgetHost())
    return;

  SendPageMessage(new PageMsg_UpdateScreenInfo(MSG_ROUTING_NONE, screen_info));

  for (auto& observer : observers_)
    observer.MainFrameWasResized(width_changed);
}

KeyboardEventProcessingResult WebContentsImpl::PreHandleKeyboardEvent(
    const NativeWebKeyboardEvent& event) {
  return delegate_ ? delegate_->PreHandleKeyboardEvent(this, event)
                   : KeyboardEventProcessingResult::NOT_HANDLED;
}

bool WebContentsImpl::HandleKeyboardEvent(const NativeWebKeyboardEvent& event) {
  if (browser_plugin_embedder_ &&
      browser_plugin_embedder_->HandleKeyboardEvent(event)) {
    return true;
  }
  return delegate_ && delegate_->HandleKeyboardEvent(this, event);
}

bool WebContentsImpl::HandleWheelEvent(
    const blink::WebMouseWheelEvent& event) {
#if !defined(OS_MACOSX)
  // On platforms other than Mac, control+mousewheel may change zoom. On Mac,
  // this isn't done for two reasons:
  //   -the OS already has a gesture to do this through pinch-zoom
  //   -if a user starts an inertial scroll, let's go, and presses control
  //      (i.e. control+tab) then the OS's buffered scroll events will come in
  //      with control key set which isn't what the user wants
  if (delegate_ && event.wheel_ticks_y &&
      event.event_action == blink::WebMouseWheelEvent::EventAction::kPageZoom) {
    // Count only integer cumulative scrolls as zoom events; this handles
    // smooth scroll and regular scroll device behavior.
    zoom_scroll_remainder_ += event.wheel_ticks_y;
    int whole_zoom_scroll_remainder_ = std::lround(zoom_scroll_remainder_);
    zoom_scroll_remainder_ -= whole_zoom_scroll_remainder_;
    if (whole_zoom_scroll_remainder_ != 0) {
      delegate_->ContentsZoomChange(whole_zoom_scroll_remainder_ > 0);
    }
    return true;
  }
#endif
  return false;
}

bool WebContentsImpl::PreHandleGestureEvent(
    const blink::WebGestureEvent& event) {
  return delegate_ && delegate_->PreHandleGestureEvent(this, event);
}

RenderWidgetHostInputEventRouter* WebContentsImpl::GetInputEventRouter() {
  if (!is_being_destroyed_ && GetOuterWebContents())
    return GetOuterWebContents()->GetInputEventRouter();

  if (!rwh_input_event_router_.get() && !is_being_destroyed_)
    rwh_input_event_router_.reset(new RenderWidgetHostInputEventRouter);
  return rwh_input_event_router_.get();
}

void WebContentsImpl::ReplicatePageFocus(bool is_focused) {
  // Focus loss may occur while this WebContents is being destroyed.  Don't
  // send the message in this case, as the main frame's RenderFrameHost and
  // other state has already been cleared.
  if (is_being_destroyed_)
    return;

  frame_tree_.ReplicatePageFocus(is_focused);
}

RenderWidgetHostImpl* WebContentsImpl::GetFocusedRenderWidgetHost(
    RenderWidgetHostImpl* receiving_widget) {
  // Events for widgets other than the main frame (e.g., popup menus) should be
  // forwarded directly to the widget they arrived on.
  if (receiving_widget != GetMainFrame()->GetRenderWidgetHost())
    return receiving_widget;

  WebContentsImpl* focused_contents = GetFocusedWebContents();

  // If the focused WebContents is showing an interstitial, return the
  // interstitial's widget.
  if (focused_contents->ShowingInterstitialPage()) {
    return static_cast<RenderFrameHostImpl*>(
               focused_contents->interstitial_page_->GetMainFrame())
        ->GetRenderWidgetHost();
  }

  // If the focused WebContents is a guest WebContents, then get the focused
  // frame in the embedder WebContents instead.
  FrameTreeNode* focused_frame = nullptr;
  if (focused_contents->browser_plugin_guest_ &&
      !GuestMode::IsCrossProcessFrameGuest(focused_contents)) {
    focused_frame = frame_tree_.GetFocusedFrame();
  } else {
    focused_frame = GetFocusedWebContents()->frame_tree_.GetFocusedFrame();
  }

  if (!focused_frame)
    return receiving_widget;

  // The view may be null if a subframe's renderer process has crashed while
  // the subframe has focus.  Drop the event in that case.  Do not give
  // it to the main frame, so that the user doesn't unexpectedly type into the
  // wrong frame if a focused subframe renderer crashes while they type.
  RenderWidgetHostView* view = focused_frame->current_frame_host()->GetView();
  if (!view)
    return nullptr;

  return RenderWidgetHostImpl::From(view->GetRenderWidgetHost());
}

RenderWidgetHostImpl* WebContentsImpl::GetRenderWidgetHostWithPageFocus() {
  WebContentsImpl* focused_web_contents = GetFocusedWebContents();

  if (focused_web_contents->ShowingInterstitialPage()) {
    return static_cast<RenderFrameHostImpl*>(
               focused_web_contents->interstitial_page_->GetMainFrame())
        ->GetRenderWidgetHost();
  }
  if (!GuestMode::IsCrossProcessFrameGuest(focused_web_contents) &&
      focused_web_contents->browser_plugin_guest_) {
    // If this is a guest, we need to be controlled by our embedder.
    return focused_web_contents->GetOuterWebContents()
        ->GetMainFrame()
        ->GetRenderWidgetHost();
  }

  return focused_web_contents->GetMainFrame()->GetRenderWidgetHost();
}

void WebContentsImpl::EnterFullscreenMode(
    const GURL& origin,
    const blink::WebFullscreenOptions& options) {
  // This method is being called to enter renderer-initiated fullscreen mode.
  // Make sure any existing fullscreen widget is shut down first.
  RenderWidgetHostView* const widget_view = GetFullscreenRenderWidgetHostView();
  if (widget_view) {
    RenderWidgetHostImpl::From(widget_view->GetRenderWidgetHost())
        ->ShutdownAndDestroyWidget(true);
  }

  if (delegate_) {
    delegate_->EnterFullscreenModeForTab(this, origin, options);

    if (keyboard_lock_widget_)
      delegate_->RequestKeyboardLock(this, esc_key_locked_);
  }

  for (auto& observer : observers_)
    observer.DidToggleFullscreenModeForTab(IsFullscreenForCurrentTab(), false);
}

void WebContentsImpl::ExitFullscreenMode(bool will_cause_resize) {
  // This method is being called to leave renderer-initiated fullscreen mode.
  // Make sure any existing fullscreen widget is shut down first.
  RenderWidgetHostView* const widget_view = GetFullscreenRenderWidgetHostView();
  if (widget_view) {
    RenderWidgetHostImpl::From(widget_view->GetRenderWidgetHost())
        ->ShutdownAndDestroyWidget(true);
  }

  if (delegate_) {
    delegate_->ExitFullscreenModeForTab(this);

    if (keyboard_lock_widget_)
      delegate_->CancelKeyboardLockRequest(this);
  }

  // The fullscreen state is communicated to the renderer through a resize
  // message. If the change in fullscreen state doesn't cause a view resize
  // then we must ensure web contents exit the fullscreen state by explicitly
  // sending a resize message. This is required for the situation of the browser
  // moving the view into a "browser fullscreen" state and then the contents
  // entering "tab fullscreen". Exiting the contents "tab fullscreen" then won't
  // have the side effect of the view resizing, hence the explicit call here is
  // required.
  if (!will_cause_resize) {
    if (RenderWidgetHostView* rwhv = GetRenderWidgetHostView()) {
        if (RenderWidgetHost* render_widget_host = rwhv->GetRenderWidgetHost())
          render_widget_host->SynchronizeVisualProperties();
    }
  }

  current_fullscreen_frame_ = nullptr;

  for (auto& observer : observers_) {
    observer.DidToggleFullscreenModeForTab(IsFullscreenForCurrentTab(),
                                           will_cause_resize);
  }

  if (display_cutout_host_impl_)
    display_cutout_host_impl_->DidExitFullscreen();
}

void WebContentsImpl::FullscreenStateChanged(RenderFrameHost* rfh,
                                             bool is_fullscreen) {
  RenderFrameHostImpl* frame = static_cast<RenderFrameHostImpl*>(rfh);

  if (is_fullscreen) {
    if (!base::Contains(fullscreen_frames_, frame)) {
      fullscreen_frames_.insert(frame);
      FullscreenFrameSetUpdated();
    }
    return;
  }

  // If |frame| is no longer in fullscreen, remove it and any descendants.
  // See https://fullscreen.spec.whatwg.org.
  size_t size_before_deletion = fullscreen_frames_.size();
  base::EraseIf(fullscreen_frames_, [&](RenderFrameHostImpl* current) {
    return (current == frame || current->IsDescendantOf(frame));
  });

  if (size_before_deletion != fullscreen_frames_.size())
    FullscreenFrameSetUpdated();
}

void WebContentsImpl::FullscreenFrameSetUpdated() {
  if (fullscreen_frames_.empty()) {
    current_fullscreen_frame_ = nullptr;
    return;
  }

  // Find the current fullscreen frame and call the observers.
  // If frame A is fullscreen, then frame B goes into inner fullscreen, then B
  // exits fullscreen - that will result in A being fullscreen.
  RenderFrameHostImpl* new_fullscreen_frame = *std::max_element(
      fullscreen_frames_.begin(), fullscreen_frames_.end(), FrameCompareDepth);

  // If we have already notified observers about this frame then we should not
  // fire the observers again.
  if (new_fullscreen_frame == current_fullscreen_frame_)
    return;
  current_fullscreen_frame_ = new_fullscreen_frame;

  for (auto& observer : observers_)
    observer.DidAcquireFullscreen(new_fullscreen_frame);

  if (display_cutout_host_impl_)
    display_cutout_host_impl_->DidAcquireFullscreen(new_fullscreen_frame);
}

#if defined(OS_ANDROID)
void WebContentsImpl::UpdateUserGestureCarryoverInfo() {
  if (delegate_)
    delegate_->UpdateUserGestureCarryoverInfo(this);
}
#endif

bool WebContentsImpl::IsFullscreenForCurrentTab() {
  return delegate_ ? delegate_->IsFullscreenForTabOrPending(this) : false;
}

bool WebContentsImpl::ShouldShowStaleContentOnEviction() {
  return GetDelegate() && GetDelegate()->ShouldShowStaleContentOnEviction(this);
}

bool WebContentsImpl::IsFullscreen() {
  return IsFullscreenForCurrentTab();
}

blink::WebDisplayMode WebContentsImpl::GetDisplayMode(
    RenderWidgetHostImpl* render_widget_host) const {
  if (!RenderViewHostImpl::From(render_widget_host))
    return blink::kWebDisplayModeBrowser;

  return delegate_ ? delegate_->GetDisplayMode(this)
                   : blink::kWebDisplayModeBrowser;
}

void WebContentsImpl::RequestToLockMouse(
    RenderWidgetHostImpl* render_widget_host,
    bool user_gesture,
    bool last_unlocked_by_target,
    bool privileged) {
  for (WebContentsImpl* current = this; current;
       current = current->GetOuterWebContents()) {
    if (current->mouse_lock_widget_) {
      render_widget_host->GotResponseToLockMouseRequest(false);
      return;
    }
  }

  if (privileged) {
    DCHECK(!GetOuterWebContents());
    mouse_lock_widget_ = render_widget_host;
    render_widget_host->GotResponseToLockMouseRequest(true);
    return;
  }

  bool widget_in_frame_tree = false;
  for (FrameTreeNode* node : frame_tree_.Nodes()) {
    if (node->current_frame_host()->GetRenderWidgetHost() ==
        render_widget_host) {
      widget_in_frame_tree = true;
      break;
    }
  }

  if (widget_in_frame_tree && delegate_) {
    for (WebContentsImpl* current = this; current;
         current = current->GetOuterWebContents()) {
      current->mouse_lock_widget_ = render_widget_host;
    }

    delegate_->RequestToLockMouse(this, user_gesture, last_unlocked_by_target);
  } else {
    render_widget_host->GotResponseToLockMouseRequest(false);
  }
}

void WebContentsImpl::LostMouseLock(RenderWidgetHostImpl* render_widget_host) {
  CHECK(mouse_lock_widget_);

  if (mouse_lock_widget_->delegate()->GetAsWebContents() != this)
    return mouse_lock_widget_->delegate()->LostMouseLock(render_widget_host);

  mouse_lock_widget_->SendMouseLockLost();
  for (WebContentsImpl* current = this; current;
       current = current->GetOuterWebContents()) {
    current->mouse_lock_widget_ = nullptr;
  }

  if (delegate_)
    delegate_->LostMouseLock();
}

bool WebContentsImpl::HasMouseLock(RenderWidgetHostImpl* render_widget_host) {
  // To verify if the mouse is locked, the mouse_lock_widget_ needs to be
  // assigned to the widget that requested the mouse lock, and the top-level
  // platform RenderWidgetHostView needs to hold the mouse lock from the OS.
  auto* widget_host = GetTopLevelRenderWidgetHostView();
  return mouse_lock_widget_ == render_widget_host && widget_host &&
         widget_host->IsMouseLocked();
}

RenderWidgetHostImpl* WebContentsImpl::GetMouseLockWidget() {
  auto* widget_host = GetTopLevelRenderWidgetHostView();
  if ((widget_host && widget_host->IsMouseLocked()) ||
      (GetFullscreenRenderWidgetHostView() &&
       GetFullscreenRenderWidgetHostView()->IsMouseLocked())) {
    return mouse_lock_widget_;
  }

  return nullptr;
}

bool WebContentsImpl::RequestKeyboardLock(
    RenderWidgetHostImpl* render_widget_host,
    bool esc_key_locked) {
  DCHECK(render_widget_host);
  if (render_widget_host->delegate()->GetAsWebContents() != this) {
    NOTREACHED();
    return false;
  }

  // KeyboardLock is only supported when called by the top-level browsing
  // context and is not supported in embedded content scenarios.
  if (GetOuterWebContents())
    return false;

  esc_key_locked_ = esc_key_locked;
  keyboard_lock_widget_ = render_widget_host;

  if (delegate_)
    delegate_->RequestKeyboardLock(this, esc_key_locked_);
  return true;
}

void WebContentsImpl::CancelKeyboardLock(
    RenderWidgetHostImpl* render_widget_host) {
  if (!keyboard_lock_widget_ || render_widget_host != keyboard_lock_widget_)
    return;

  RenderWidgetHostImpl* old_keyboard_lock_widget = keyboard_lock_widget_;
  keyboard_lock_widget_ = nullptr;

  if (delegate_)
    delegate_->CancelKeyboardLockRequest(this);

  old_keyboard_lock_widget->CancelKeyboardLock();
}

RenderWidgetHostImpl* WebContentsImpl::GetKeyboardLockWidget() {
  return keyboard_lock_widget_;
}

void WebContentsImpl::OnRenderFrameProxyVisibilityChanged(
    blink::mojom::FrameVisibility visibility) {
  switch (visibility) {
    case blink::mojom::FrameVisibility::kRenderedInViewport:
      WasShown();
      break;
    case blink::mojom::FrameVisibility::kNotRendered:
      WasHidden();
      break;
    case blink::mojom::FrameVisibility::kRenderedOutOfViewport:
      WasOccluded();
      break;
  }
}

void WebContentsImpl::CreateNewWindow(
    RenderFrameHost* opener,
    int32_t render_view_route_id,
    int32_t main_frame_route_id,
    int32_t main_frame_widget_route_id,
    const mojom::CreateNewWindowParams& params,
    bool has_user_gesture,
    SessionStorageNamespace* session_storage_namespace) {
  // We should have zero valid routing ids, or three valid routing IDs.
  DCHECK_EQ((render_view_route_id == MSG_ROUTING_NONE),
            (main_frame_route_id == MSG_ROUTING_NONE));
  DCHECK_EQ((render_view_route_id == MSG_ROUTING_NONE),
            (main_frame_widget_route_id == MSG_ROUTING_NONE));
  DCHECK(opener);

  int render_process_id = opener->GetProcess()->GetID();
  SiteInstance* source_site_instance = opener->GetSiteInstance();

  // The route IDs passed into this function can be trusted not to already
  // be in use; they were allocated by the RenderWidgetHelper by the caller.
  DCHECK(!RenderFrameHostImpl::FromID(render_process_id, main_frame_route_id));

  // We usually create the new window in the same BrowsingInstance (group of
  // script-related windows), by passing in the current SiteInstance.  However,
  // if the opener is being suppressed (in a non-guest), we create a new
  // SiteInstance in its own BrowsingInstance.
  bool is_guest = BrowserPluginGuest::IsGuest(this);

  // If the opener is to be suppressed, the new window can be in any process.
  // Since routing ids are process specific, we must not have one passed in
  // as argument here.
  DCHECK(!params.opener_suppressed || render_view_route_id == MSG_ROUTING_NONE);

  scoped_refptr<SiteInstance> site_instance =
      params.opener_suppressed && !is_guest
          ? SiteInstance::CreateForURL(GetBrowserContext(), params.target_url)
          : source_site_instance;

  // We must assign the SessionStorageNamespace before calling Init().
  //
  // http://crbug.com/142685
  const std::string& partition_id =
      GetContentClient()->browser()->
          GetStoragePartitionIdForSite(GetBrowserContext(),
                                       site_instance->GetSiteURL());
  StoragePartition* partition = BrowserContext::GetStoragePartition(
      GetBrowserContext(), site_instance.get());
  DOMStorageContextWrapper* dom_storage_context =
      static_cast<DOMStorageContextWrapper*>(partition->GetDOMStorageContext());
  SessionStorageNamespaceImpl* session_storage_namespace_impl =
      static_cast<SessionStorageNamespaceImpl*>(session_storage_namespace);
  CHECK(session_storage_namespace_impl->IsFromContext(dom_storage_context));

  if (delegate_ &&
      !delegate_->ShouldCreateWebContents(
          this, opener, source_site_instance, render_view_route_id,
          main_frame_route_id, main_frame_widget_route_id,
          params.window_container_type, opener->GetLastCommittedURL(),
          params.frame_name, params.target_url, partition_id,
          session_storage_namespace)) {
    // Note: even though we're not creating a WebContents here, it could have
    // been created by the embedder so ensure that the RenderFrameHost is
    // properly initialized.
    // It's safe to only target the frame because the render process will not
    // have a chance to create more frames at this point.
    RenderFrameHostImpl* rfh =
        RenderFrameHostImpl::FromID(render_process_id, main_frame_route_id);
    if (rfh) {
      DCHECK(rfh->IsRenderFrameLive());
      rfh->Init();
    }
    return;
  }

  // Create the new web contents. This will automatically create the new
  // WebContentsView. In the future, we may want to create the view separately.
  CreateParams create_params(GetBrowserContext(), site_instance.get());
  create_params.routing_id = render_view_route_id;
  create_params.main_frame_routing_id = main_frame_route_id;
  create_params.main_frame_widget_routing_id = main_frame_widget_route_id;
  create_params.main_frame_name = params.frame_name;
  create_params.opener_render_process_id = render_process_id;
  create_params.opener_render_frame_id = opener->GetRoutingID();
  create_params.opener_suppressed = params.opener_suppressed;
  if (params.disposition == WindowOpenDisposition::NEW_BACKGROUND_TAB)
    create_params.initially_hidden = true;
  create_params.renderer_initiated_creation =
      main_frame_route_id != MSG_ROUTING_NONE;

  std::unique_ptr<WebContents> new_contents;
  if (!is_guest) {
    create_params.context = view_->GetNativeView();
    create_params.initial_size = GetContainerBounds().size();
    new_contents = WebContents::Create(create_params);
  }  else {
    new_contents = base::WrapUnique(
        GetBrowserPluginGuest()->CreateNewGuestWindow(create_params));
  }
  auto owning_contents_impl =
      base::WrapUnique(static_cast<WebContentsImpl*>(new_contents.release()));
  auto* new_contents_impl = owning_contents_impl.get();

  new_contents_impl->GetController().SetSessionStorageNamespace(
      partition_id, session_storage_namespace);

  // If the new frame has a name, make sure any SiteInstances that can find
  // this named frame have proxies for it.  Must be called after
  // SetSessionStorageNamespace, since this calls CreateRenderView, which uses
  // GetSessionStorageNamespace.
  if (!params.frame_name.empty())
    new_contents_impl->GetRenderManager()->CreateProxiesForNewNamedFrame();

  // Save the window for later if we're not suppressing the opener (since it
  // will be shown immediately).
  if (!params.opener_suppressed) {
    if (!is_guest) {
      WebContentsView* new_view = new_contents_impl->view_.get();

      // TODO(brettw): It seems bogus that we have to call this function on the
      // newly created object and give it one of its own member variables.
      new_view->CreateViewForWidget(
          new_contents_impl->GetRenderViewHost()->GetWidget(), false);
    }
    // Save the created window associated with the route so we can show it
    // later.
    //
    // TODO(ajwong): This should be keyed off the RenderFrame routing id or the
    // FrameTreeNode id instead of the routing id of the Widget for the main
    // frame.  https://crbug.com/545684
    DCHECK_NE(MSG_ROUTING_NONE, main_frame_widget_route_id);
    GlobalRoutingID id(render_process_id, main_frame_widget_route_id);
    pending_contents_[id] = std::move(owning_contents_impl);
    AddDestructionObserver(new_contents_impl);
  }

  if (delegate_) {
    delegate_->WebContentsCreated(this, render_process_id,
                                  opener->GetRoutingID(), params.frame_name,
                                  params.target_url, new_contents_impl);
  }

  for (auto& observer : observers_) {
    observer.DidOpenRequestedURL(new_contents_impl, opener, params.target_url,
                                 params.referrer.To<Referrer>(),
                                 params.disposition, ui::PAGE_TRANSITION_LINK,
                                 false,  // started_from_context_menu
                                 true);  // renderer_initiated
  }

  // Any new WebContents opened while this WebContents is in fullscreen can be
  // used to confuse the user, so drop fullscreen.
  ForSecurityDropFullscreen();

  if (params.opener_suppressed) {
    // When the opener is suppressed, the original renderer cannot access the
    // new window.  As a result, we need to show and navigate the window here.
    bool was_blocked = false;

    if (delegate_) {
      base::WeakPtr<WebContentsImpl> weak_new_contents =
          new_contents_impl->weak_factory_.GetWeakPtr();

      gfx::Rect initial_rect;  // Report an empty initial rect.
      delegate_->AddNewContents(this, std::move(owning_contents_impl),
                                params.disposition, initial_rect,
                                has_user_gesture, &was_blocked);
      // The delegate may delete |new_contents_impl| during AddNewContents().
      if (!weak_new_contents)
        return;
    }

    if (!was_blocked) {
      std::unique_ptr<NavigationController::LoadURLParams> load_params =
          std::make_unique<NavigationController::LoadURLParams>(
              params.target_url);
      load_params->initiator_origin = opener->GetLastCommittedOrigin();
      load_params->referrer = params.referrer.To<Referrer>();
      load_params->transition_type = ui::PAGE_TRANSITION_LINK;
      load_params->is_renderer_initiated = true;
      load_params->has_user_gesture = has_user_gesture;

      if (delegate_ && !is_guest &&
          !delegate_->ShouldResumeRequestsForCreatedWindow()) {
        // We are in asynchronous add new contents path, delay navigation.
        DCHECK(!new_contents_impl->delayed_open_url_params_);
        new_contents_impl->delayed_load_url_params_ = std::move(load_params);
      } else {
        new_contents_impl->controller_.LoadURLWithParams(*load_params.get());
        if (!is_guest)
          new_contents_impl->Focus();
      }
    }
  }
}

void WebContentsImpl::CreateNewWidget(int32_t render_process_id,
                                      int32_t widget_route_id,
                                      mojom::WidgetPtr widget) {
  CreateNewWidget(render_process_id, widget_route_id, /*is_fullscreen=*/false,
                  std::move(widget));
}

void WebContentsImpl::CreateNewFullscreenWidget(int32_t render_process_id,
                                                int32_t widget_route_id,
                                                mojom::WidgetPtr widget) {
  CreateNewWidget(render_process_id, widget_route_id, /*is_fullscreen=*/true,
                  std::move(widget));
}

void WebContentsImpl::CreateNewWidget(int32_t render_process_id,
                                      int32_t route_id,
                                      bool is_fullscreen,
                                      mojom::WidgetPtr widget) {
  RenderProcessHost* process = RenderProcessHost::FromID(render_process_id);
  // A message to create a new widget can only come from an active process for
  // this WebContentsImpl instance. If any other process sends the request,
  // it is invalid and the process must be terminated.
  if (!HasMatchingProcess(&frame_tree_, render_process_id)) {
    ReceivedBadMessage(process, bad_message::WCI_NEW_WIDGET_PROCESS_MISMATCH);
    return;
  }

  RenderWidgetHostImpl* widget_host = new RenderWidgetHostImpl(
      this, process, route_id, std::move(widget), IsHidden());

  RenderWidgetHostViewBase* widget_view =
      static_cast<RenderWidgetHostViewBase*>(
          view_->CreateViewForChildWidget(widget_host));
  if (!widget_view)
    return;
  // Fullscreen child widgets are frames, other child widgets are popups, and
  // popups should not get activated.
  if (!is_fullscreen)
    widget_view->SetWidgetType(WidgetType::kPopup);
  // Save the created widget associated with the route so we can show it later.
  pending_widget_views_[GlobalRoutingID(render_process_id, route_id)] =
      widget_view;
}

void WebContentsImpl::ShowCreatedWindow(int process_id,
                                        int main_frame_widget_route_id,
                                        WindowOpenDisposition disposition,
                                        const gfx::Rect& initial_rect,
                                        bool user_gesture) {
  // This method is the renderer requesting an existing top level window to
  // show a new top level window that the renderer created. Each top level
  // window is associated with a WebContents. In this case it was created
  // earlier but showing it was deferred until the renderer requested for it
  // to be shown. We find that previously created WebContents here.
  // TODO(danakj): Why do we defer this show step until the renderer asks for it
  // when it will always do so. What needs to happen in the renderer before we
  // reach here?
  std::unique_ptr<WebContentsImpl> owned_created =
      GetCreatedWindow(process_id, main_frame_widget_route_id);
  WebContentsImpl* created = owned_created.get();
  // The browser may have rejected the request to make a new window, or the
  // renderer could be sending an invalid route id. Ignore the request then.
  if (!created)
    return;

  // This uses the delegate for the WebContents where the window was created
  // from, to control how to show the newly created window.
  WebContentsDelegate* delegate = GetDelegate();

  // The delegate can be null in tests, so we must check for it :(.
  if (delegate) {
    // Mark the web contents as pending resume, then immediately do
    // the resume if the delegate wants it.
    created->is_resume_pending_ = true;
    if (delegate->ShouldResumeRequestsForCreatedWindow())
      created->ResumeLoadingCreatedWebContents();

    base::WeakPtr<WebContentsImpl> weak_created =
        created->weak_factory_.GetWeakPtr();
    delegate->AddNewContents(this, std::move(owned_created), disposition,
                             initial_rect, user_gesture, nullptr);
    // The delegate may delete |created| during AddNewContents().
    if (!weak_created)
      return;
  }

  RenderWidgetHostImpl* rwh = created->GetMainFrame()->GetRenderWidgetHost();
  DCHECK_EQ(main_frame_widget_route_id, rwh->GetRoutingID());
  rwh->Send(new WidgetMsg_SetBounds_ACK(rwh->GetRoutingID()));
}

void WebContentsImpl::ShowCreatedWidget(int process_id,
                                        int widget_route_id,
                                        const gfx::Rect& initial_rect) {
  ShowCreatedWidget(process_id, widget_route_id, false, initial_rect);
}

void WebContentsImpl::ShowCreatedFullscreenWidget(int process_id,
                                                  int widget_route_id) {
  ShowCreatedWidget(process_id, widget_route_id, true, gfx::Rect());
}

void WebContentsImpl::ShowCreatedWidget(int process_id,
                                        int route_id,
                                        bool is_fullscreen,
                                        const gfx::Rect& initial_rect) {
  RenderWidgetHostViewBase* widget_host_view =
      static_cast<RenderWidgetHostViewBase*>(
          GetCreatedWidget(process_id, route_id));
  if (!widget_host_view)
    return;

  RenderWidgetHostView* view = nullptr;
  if (GetOuterWebContents()) {
    view = GetOuterWebContents()->GetRenderWidgetHostView();
  } else {
    view = GetRenderWidgetHostView();
  }

  // Fullscreen child widgets are frames, other child widgets are popups.
  if (is_fullscreen) {
    DCHECK_EQ(MSG_ROUTING_NONE, fullscreen_widget_routing_id_);
    view_->StoreFocus();
    fullscreen_widget_process_id_ =
        widget_host_view->GetRenderWidgetHost()->GetProcess()->GetID();
    fullscreen_widget_routing_id_ = route_id;
    if (delegate_ && delegate_->EmbedsFullscreenWidget()) {
      widget_host_view->InitAsChild(GetRenderWidgetHostView()->GetNativeView());
      delegate_->EnterFullscreenModeForTab(this, GURL(),
                                           blink::WebFullscreenOptions());
    } else {
      widget_host_view->InitAsFullscreen(view);
    }
    for (auto& observer : observers_)
      observer.DidShowFullscreenWidget();
    if (!widget_host_view->HasFocus())
      widget_host_view->Focus();
  } else {
    widget_host_view->InitAsPopup(view, initial_rect);
  }

  RenderWidgetHostImpl* render_widget_host_impl = widget_host_view->host();
  render_widget_host_impl->Init();
  // Only allow privileged mouse lock for fullscreen render widget, which is
  // used to implement Pepper Flash fullscreen.
  render_widget_host_impl->set_allow_privileged_mouse_lock(is_fullscreen);
}

std::unique_ptr<WebContentsImpl> WebContentsImpl::GetCreatedWindow(
    int process_id,
    int main_frame_widget_route_id) {
  auto key = GlobalRoutingID(process_id, main_frame_widget_route_id);
  auto iter = pending_contents_.find(key);

  // Certain systems can block the creation of new windows. If we didn't succeed
  // in creating one, just return NULL.
  if (iter == pending_contents_.end())
    return nullptr;

  std::unique_ptr<WebContentsImpl> new_contents = std::move(iter->second);
  pending_contents_.erase(key);
  RemoveDestructionObserver(new_contents.get());

  // Don't initialize the guest WebContents immediately.
  if (BrowserPluginGuest::IsGuest(new_contents.get()))
    return new_contents;

  if (!new_contents->GetMainFrame()->GetProcess()->IsInitializedAndNotDead() ||
      !new_contents->GetMainFrame()->GetView()) {
    return nullptr;
  }

  return new_contents;
}

RenderWidgetHostView* WebContentsImpl::GetCreatedWidget(int process_id,
                                                        int route_id) {
  auto iter = pending_widget_views_.find(GlobalRoutingID(process_id, route_id));
  if (iter == pending_widget_views_.end()) {
    DCHECK(false);
    return nullptr;
  }

  RenderWidgetHostView* widget_host_view = iter->second;
  pending_widget_views_.erase(GlobalRoutingID(process_id, route_id));

  RenderWidgetHost* widget_host = widget_host_view->GetRenderWidgetHost();
  if (!widget_host->GetProcess()->IsInitializedAndNotDead()) {
    // The view has gone away or the renderer crashed. Nothing to do.
    return nullptr;
  }

  return widget_host_view;
}

void WebContentsImpl::RequestMediaAccessPermission(
    const MediaStreamRequest& request,
    MediaResponseCallback callback) {
  if (delegate_) {
    delegate_->RequestMediaAccessPermission(this, request, std::move(callback));
  } else {
    std::move(callback).Run(
        blink::MediaStreamDevices(),
        blink::mojom::MediaStreamRequestResult::FAILED_DUE_TO_SHUTDOWN,
        std::unique_ptr<MediaStreamUI>());
  }
}

bool WebContentsImpl::CheckMediaAccessPermission(
    RenderFrameHost* render_frame_host,
    const url::Origin& security_origin,
    blink::mojom::MediaStreamType type) {
  DCHECK(type == blink::mojom::MediaStreamType::DEVICE_AUDIO_CAPTURE ||
         type == blink::mojom::MediaStreamType::DEVICE_VIDEO_CAPTURE);
  return delegate_ && delegate_->CheckMediaAccessPermission(
                          render_frame_host, security_origin.GetURL(), type);
}

std::string WebContentsImpl::GetDefaultMediaDeviceID(
    blink::mojom::MediaStreamType type) {
  if (!delegate_)
    return std::string();
  return delegate_->GetDefaultMediaDeviceID(this, type);
}

SessionStorageNamespace* WebContentsImpl::GetSessionStorageNamespace(
    SiteInstance* instance) {
  return controller_.GetSessionStorageNamespace(instance);
}

SessionStorageNamespaceMap WebContentsImpl::GetSessionStorageNamespaceMap() {
  return controller_.GetSessionStorageNamespaceMap();
}

FrameTree* WebContentsImpl::GetFrameTree() {
  return &frame_tree_;
}

bool WebContentsImpl::IsOverridingUserAgent() {
  return GetController().GetVisibleEntry() &&
         GetController().GetVisibleEntry()->GetIsOverridingUserAgent();
}

bool WebContentsImpl::IsJavaScriptDialogShowing() const {
  return is_showing_javascript_dialog_;
}

bool WebContentsImpl::ShouldIgnoreUnresponsiveRenderer() {
  // Ignore unresponsive renderers if the debugger is attached to them since the
  // unresponsiveness might be a result of the renderer sitting on a breakpoint.
  //
#ifdef OS_WIN
  // Check if a windows debugger is attached to the renderer process.
  base::ProcessHandle process_handle =
      GetMainFrame()->GetProcess()->GetProcess().Handle();
  BOOL debugger_present = FALSE;
  if (CheckRemoteDebuggerPresent(process_handle, &debugger_present) &&
      debugger_present)
    return true;
#endif  // OS_WIN

  // TODO(pfeldman): Fix this to only return true if the renderer is *actually*
  // sitting on a breakpoint. https://crbug.com/684202
  return DevToolsAgentHost::IsDebuggerAttached(this);
}

ui::AXMode WebContentsImpl::GetAccessibilityMode() {
  return accessibility_mode_;
}

void WebContentsImpl::AccessibilityEventReceived(
    const AXEventNotificationDetails& details) {
  for (auto& observer : observers_)
    observer.AccessibilityEventReceived(details);
}

void WebContentsImpl::AccessibilityLocationChangesReceived(
    const std::vector<AXLocationChangeNotificationDetails>& details) {
  for (auto& observer : observers_)
    observer.AccessibilityLocationChangesReceived(details);
}

base::string16 WebContentsImpl::DumpAccessibilityTree(bool internal) {
  auto* ax_mgr = GetOrCreateRootBrowserAccessibilityManager();
  DCHECK(ax_mgr);
  return AccessibilityTreeFormatter::DumpAccessibilityTreeFromManager(ax_mgr,
                                                                      internal);
}

RenderFrameHost* WebContentsImpl::GetGuestByInstanceID(
    RenderFrameHost* render_frame_host,
    int browser_plugin_instance_id) {
  BrowserPluginGuestManager* guest_manager =
      GetBrowserContext()->GetGuestManager();
  if (!guest_manager)
    return nullptr;

  WebContents* guest = guest_manager->GetGuestByInstanceID(
      render_frame_host->GetProcess()->GetID(), browser_plugin_instance_id);
  if (!guest)
    return nullptr;

  return guest->GetMainFrame();
}

device::mojom::GeolocationContext* WebContentsImpl::GetGeolocationContext() {
  if (geolocation_context_)
    return geolocation_context_.get();

  auto request = mojo::MakeRequest(&geolocation_context_);
  service_manager::Connector* connector = GetSystemConnector();
  if (connector)
    connector->BindInterface(device::mojom::kServiceName, std::move(request));
  return geolocation_context_.get();
}

device::mojom::WakeLockContext* WebContentsImpl::GetWakeLockContext() {
  if (!wake_lock_context_host_)
    wake_lock_context_host_.reset(new WakeLockContextHost(this));
  return wake_lock_context_host_->GetWakeLockContext();
}

#if defined(OS_ANDROID)
void WebContentsImpl::GetNFC(device::mojom::NFCRequest request) {
  if (!nfc_host_)
    nfc_host_.reset(new NFCHost(this));
  nfc_host_->GetNFC(std::move(request));
}
#endif

void WebContentsImpl::SetNotWaitingForResponse() {
  if (waiting_for_response_ == false)
    return;

  waiting_for_response_ = false;
  if (delegate_)
    delegate_->LoadingStateChanged(this, is_load_to_different_document_);
  for (auto& observer : observers_)
    observer.DidReceiveResponse();
}

void WebContentsImpl::SendScreenRects() {
  for (FrameTreeNode* node : frame_tree_.Nodes()) {
    if (node->current_frame_host()->is_local_root())
      node->current_frame_host()->GetRenderWidgetHost()->SendScreenRects();
  }

  // Interstitials have their own |frame_tree_|.
  if (interstitial_page_) {
    FrameTree* interstitial_frame_tree = interstitial_page_->GetFrameTree();
    for (FrameTreeNode* node : interstitial_frame_tree->Nodes()) {
      if (node->current_frame_host()->is_local_root())
        node->current_frame_host()->GetRenderWidgetHost()->SendScreenRects();
    }
  }

  if (browser_plugin_embedder_ && !is_being_destroyed_)
    browser_plugin_embedder_->DidSendScreenRects();
}

TextInputManager* WebContentsImpl::GetTextInputManager() {
  if (GetOuterWebContents())
    return GetOuterWebContents()->GetTextInputManager();

  if (!text_input_manager_ && !browser_plugin_guest_) {
    text_input_manager_.reset(new TextInputManager(
        GetBrowserContext() &&
        !GetBrowserContext()->IsOffTheRecord()) /* should_do_learning */);
  }

  return text_input_manager_.get();
}

bool WebContentsImpl::OnUpdateDragCursor() {
  return browser_plugin_embedder_ &&
         browser_plugin_embedder_->OnUpdateDragCursor();
}

bool WebContentsImpl::IsWidgetForMainFrame(
    RenderWidgetHostImpl* render_widget_host) {
  return render_widget_host == GetMainFrame()->GetRenderWidgetHost();
}

BrowserAccessibilityManager*
    WebContentsImpl::GetRootBrowserAccessibilityManager() {
  RenderFrameHostImpl* rfh = static_cast<RenderFrameHostImpl*>(
      ShowingInterstitialPage() ? GetInterstitialPage()->GetMainFrame()
                                : GetMainFrame());
  return rfh ? rfh->browser_accessibility_manager() : nullptr;
}

BrowserAccessibilityManager*
    WebContentsImpl::GetOrCreateRootBrowserAccessibilityManager() {
  RenderFrameHostImpl* rfh = static_cast<RenderFrameHostImpl*>(
      ShowingInterstitialPage() ? GetInterstitialPage()->GetMainFrame()
                                : GetMainFrame());
  return rfh ? rfh->GetOrCreateBrowserAccessibilityManager() : nullptr;
}

void WebContentsImpl::ExecuteEditCommand(
    const std::string& command,
    const base::Optional<base::string16>& value) {
  auto* input_handler = GetFocusedFrameInputHandler();
  if (!input_handler)
    return;

  input_handler->ExecuteEditCommand(command, value);
}

void WebContentsImpl::MoveRangeSelectionExtent(const gfx::Point& extent) {
  auto* input_handler = GetFocusedFrameInputHandler();
  if (!input_handler)
    return;

  input_handler->MoveRangeSelectionExtent(extent);
}

void WebContentsImpl::SelectRange(const gfx::Point& base,
                                  const gfx::Point& extent) {
  auto* input_handler = GetFocusedFrameInputHandler();
  if (!input_handler)
    return;

  input_handler->SelectRange(base, extent);
}

void WebContentsImpl::MoveCaret(const gfx::Point& extent) {
  auto* input_handler = GetFocusedFrameInputHandler();
  if (!input_handler)
    return;

  input_handler->MoveCaret(extent);
}

void WebContentsImpl::AdjustSelectionByCharacterOffset(
    int start_adjust,
    int end_adjust,
    bool show_selection_menu) {
  auto* input_handler = GetFocusedFrameInputHandler();
  if (!input_handler)
    return;

  using blink::mojom::SelectionMenuBehavior;
  input_handler->AdjustSelectionByCharacterOffset(
      start_adjust, end_adjust,
      show_selection_menu ? SelectionMenuBehavior::kShow
                          : SelectionMenuBehavior::kHide);
}

void WebContentsImpl::UpdatePreferredSize(const gfx::Size& pref_size) {
  const gfx::Size old_size = GetPreferredSize();
  preferred_size_ = pref_size;
  OnPreferredSizeChanged(old_size);
}

void WebContentsImpl::ResizeDueToAutoResize(
    RenderWidgetHostImpl* render_widget_host,
    const gfx::Size& new_size) {
  if (render_widget_host != GetRenderViewHost()->GetWidget())
    return;

  auto_resize_size_ = new_size;

  // Out-of-process iframe visible viewport sizes usually come from the
  // top-level RenderWidgetHostView, but when auto-resize is enabled on the
  // top frame then that size is used instead.
  for (FrameTreeNode* node : frame_tree_.Nodes()) {
    if (node->current_frame_host()->is_local_root()) {
      RenderWidgetHostImpl* host =
          node->current_frame_host()->GetRenderWidgetHost();
      if (host != render_widget_host)
        host->SynchronizeVisualProperties();
    }
  }

  if (delegate_)
    delegate_->ResizeDueToAutoResize(this, new_size);
}

gfx::Size WebContentsImpl::GetAutoResizeSize() {
  return auto_resize_size_;
}

void WebContentsImpl::ResetAutoResizeSize() {
  auto_resize_size_ = gfx::Size();
}

InputEventShim* WebContentsImpl::GetInputEventShim() const {
  // The only thing that intercepts text input and mouse lock is the
  // BrowserPluginGuest. Delegate to the BrowserPluginGuest logic for
  // whether or not it needs to shim these events.
  if (browser_plugin_guest_) {
    return browser_plugin_guest_->GetInputEventShim();
  }
  return nullptr;
}

WebContents* WebContentsImpl::OpenURL(const OpenURLParams& params) {
  if (!delegate_) {
    // Embedder can delay setting a delegate on new WebContents with
    // WebContentsDelegate::ShouldResumeRequestsForCreatedWindow. In the mean
    // time, navigations, including the initial one, that goes through OpenURL
    // should be delayed until embedder is ready to resume loading.
    delayed_open_url_params_ = std::make_unique<OpenURLParams>(params);

    // If there was a navigation deferred when creating the window through
    // CreateNewWindow, drop it in favor of this navigation.
    delayed_load_url_params_.reset();

    return nullptr;
  }

  WebContents* new_contents = delegate_->OpenURLFromTab(this, params);

  RenderFrameHost* source_render_frame_host = RenderFrameHost::FromID(
      params.source_render_process_id, params.source_render_frame_id);

  if (source_render_frame_host && params.source_site_instance) {
    CHECK_EQ(source_render_frame_host->GetSiteInstance(),
             params.source_site_instance.get());
  }

  if (new_contents && source_render_frame_host && new_contents != this) {
    for (auto& observer : observers_) {
      observer.DidOpenRequestedURL(
          new_contents, source_render_frame_host, params.url, params.referrer,
          params.disposition, params.transition,
          params.started_from_context_menu, params.is_renderer_initiated);
    }
  }

  return new_contents;
}

void WebContentsImpl::RenderFrameForInterstitialPageCreated(
    RenderFrameHost* render_frame_host) {
  for (auto& observer : observers_)
    observer.RenderFrameForInterstitialPageCreated(render_frame_host);
}

void WebContentsImpl::AttachInterstitialPage(
    InterstitialPageImpl* interstitial_page) {
  DCHECK(!interstitial_page_ && interstitial_page);
  interstitial_page_ = interstitial_page;

  // Cancel any visible dialogs so that they don't interfere with the
  // interstitial.
  CancelActiveAndPendingDialogs();

  for (auto& observer : observers_)
    observer.DidAttachInterstitialPage();

  // Stop the throbber if needed while the interstitial page is shown.
  if (frame_tree_.IsLoading())
    LoadingStateChanged(true, true, nullptr);

  // Connect to outer WebContents if necessary.
  if (node_.OuterContentsFrameTreeNode()) {
    if (GetRenderManager()->GetProxyToOuterDelegate()) {
      DCHECK(
          static_cast<RenderWidgetHostViewBase*>(interstitial_page->GetView())
              ->IsRenderWidgetHostViewChildFrame());
      RenderWidgetHostViewChildFrame* view =
          static_cast<RenderWidgetHostViewChildFrame*>(
              interstitial_page->GetView());
      GetRenderManager()->SetRWHViewForInnerContents(view);
    }
  }

#if defined(OS_ANDROID)
  // Update importance of the interstitial.
  static_cast<RenderFrameHostImpl*>(interstitial_page_->GetMainFrame())
      ->GetRenderWidgetHost()
      ->SetImportance(GetMainFrame()->GetRenderWidgetHost()->importance());
#endif

  if (accessibility_mode_.has_mode(ui::AXMode::kNativeAPIs)) {
    // Make sure that the main page's accessibility tree is hidden and the
    // interstitial gets focus.
    RenderFrameHostImpl* rfh =
        static_cast<RenderFrameHostImpl*>(GetMainFrame());
    if (rfh) {
      BrowserAccessibilityManager* accessibility_manager =
          rfh->browser_accessibility_manager();
      if (accessibility_manager)
        accessibility_manager->set_hidden_by_interstitial_page(true);
    }
    rfh = static_cast<RenderFrameHostImpl*>(
        GetInterstitialPage()->GetMainFrame());
    if (rfh) {
      BrowserAccessibilityManager* accessibility_manager =
          rfh->GetOrCreateBrowserAccessibilityManager();
      if (accessibility_manager)
        accessibility_manager->OnWindowFocused();
    }
  }
}

void WebContentsImpl::DidProceedOnInterstitial() {
  // The interstitial page should no longer be pausing the throbber.
  DCHECK(!(ShowingInterstitialPage() && interstitial_page_->pause_throbber()));

  // Restart the throbber now that the interstitial page no longer pauses it.
  if (ShowingInterstitialPage() && frame_tree_.IsLoading())
    LoadingStateChanged(true, true, nullptr);
}

bool WebContentsImpl::HadInnerWebContents() {
  return had_inner_webcontents_;
}

void WebContentsImpl::DetachInterstitialPage(bool has_focus) {
  bool interstitial_pausing_throbber =
      ShowingInterstitialPage() && interstitial_page_->pause_throbber();
  if (ShowingInterstitialPage())
    interstitial_page_ = nullptr;

  // Make sure that the main page's accessibility tree is no longer
  // suppressed.
  RenderFrameHostImpl* rfh = GetMainFrame();
  if (rfh) {
    BrowserAccessibilityManager* accessibility_manager =
        rfh->browser_accessibility_manager();
    if (accessibility_manager)
      accessibility_manager->set_hidden_by_interstitial_page(false);
  }

  // If the focus was on the interstitial, let's keep it to the page.
  // (Note that in unit-tests the RVH may not have a view).
  if (has_focus && GetRenderViewHost()->GetWidget()->GetView())
    GetRenderViewHost()->GetWidget()->GetView()->Focus();

  for (auto& observer : observers_)
    observer.DidDetachInterstitialPage();

  // Disconnect from outer WebContents if necessary. This must happen after the
  // interstitial page is cleared above, since the call to
  // SetRWHViewForInnerContents below may loop over all the
  // RenderWidgetHostViews in the tree (otherwise, including the now-deleted
  // view for the interstitial).
  if (node_.OuterContentsFrameTreeNode()) {
    if (GetRenderManager()->GetProxyToOuterDelegate()) {
      DCHECK(static_cast<RenderWidgetHostViewBase*>(
                 GetRenderManager()->current_frame_host()->GetView())
                 ->IsRenderWidgetHostViewChildFrame());
      RenderWidgetHostViewChildFrame* view =
          static_cast<RenderWidgetHostViewChildFrame*>(
              GetRenderManager()->current_frame_host()->GetView());
      GetRenderManager()->SetRWHViewForInnerContents(view);
    }
  }

  // Restart the throbber if needed now that the interstitial page is going
  // away.
  if (interstitial_pausing_throbber && frame_tree_.IsLoading())
    LoadingStateChanged(true, true, nullptr);
}

void WebContentsImpl::SetHistoryOffsetAndLength(int history_offset,
                                                int history_length) {
  SendPageMessage(new PageMsg_SetHistoryOffsetAndLength(
      MSG_ROUTING_NONE, history_offset, history_length));
}

void WebContentsImpl::SetHistoryOffsetAndLengthForView(
    RenderViewHost* render_view_host,
    int history_offset,
    int history_length) {
  render_view_host->Send(new PageMsg_SetHistoryOffsetAndLength(
      render_view_host->GetRoutingID(), history_offset, history_length));
}

void WebContentsImpl::ReloadFocusedFrame(bool bypass_cache) {
  RenderFrameHost* focused_frame = GetFocusedFrame();
  if (!focused_frame)
    return;

  focused_frame->Send(new FrameMsg_Reload(
      focused_frame->GetRoutingID(), bypass_cache));
}

void WebContentsImpl::ReloadLoFiImages() {
  SendToAllFrames(new FrameMsg_ReloadLoFiImages(MSG_ROUTING_NONE));
  for (auto& observer : observers_)
    observer.DidReloadLoFiImages();
}

std::vector<blink::mojom::PauseSubresourceLoadingHandlePtr>
WebContentsImpl::PauseSubresourceLoading() {
  std::vector<blink::mojom::PauseSubresourceLoadingHandlePtr> handles;
  for (RenderFrameHost* rfh : GetAllFrames()) {
    if (!rfh->IsRenderFrameLive())
      continue;
    handles.push_back(rfh->PauseSubresourceLoading());
  }
  return handles;
}

void WebContentsImpl::Undo() {
  auto* input_handler = GetFocusedFrameInputHandler();
  if (!input_handler)
    return;

  input_handler->Undo();
  RecordAction(base::UserMetricsAction("Undo"));
}

void WebContentsImpl::Redo() {
  auto* input_handler = GetFocusedFrameInputHandler();
  if (!input_handler)
    return;

  input_handler->Redo();
  RecordAction(base::UserMetricsAction("Redo"));
}

void WebContentsImpl::Cut() {
  auto* input_handler = GetFocusedFrameInputHandler();
  if (!input_handler)
    return;

  input_handler->Cut();
  RecordAction(base::UserMetricsAction("Cut"));
}

void WebContentsImpl::Copy() {
  auto* input_handler = GetFocusedFrameInputHandler();
  if (!input_handler)
    return;

  input_handler->Copy();
  RecordAction(base::UserMetricsAction("Copy"));
}

void WebContentsImpl::CopyToFindPboard() {
#if defined(OS_MACOSX)
  auto* input_handler = GetFocusedFrameInputHandler();
  if (!input_handler)
    return;

  // Windows/Linux don't have the concept of a find pasteboard.
  input_handler->CopyToFindPboard();
  RecordAction(base::UserMetricsAction("CopyToFindPboard"));
#endif
}

void WebContentsImpl::Paste() {
  auto* input_handler = GetFocusedFrameInputHandler();
  if (!input_handler)
    return;

  input_handler->Paste();
  for (auto& observer : observers_)
    observer.OnPaste();
  RecordAction(base::UserMetricsAction("Paste"));
}

void WebContentsImpl::PasteAndMatchStyle() {
  auto* input_handler = GetFocusedFrameInputHandler();
  if (!input_handler)
    return;

  input_handler->PasteAndMatchStyle();
  for (auto& observer : observers_)
    observer.OnPaste();
  RecordAction(base::UserMetricsAction("PasteAndMatchStyle"));
}

void WebContentsImpl::Delete() {
  auto* input_handler = GetFocusedFrameInputHandler();
  if (!input_handler)
    return;

  input_handler->Delete();
  RecordAction(base::UserMetricsAction("DeleteSelection"));
}

void WebContentsImpl::SelectAll() {
  auto* input_handler = GetFocusedFrameInputHandler();
  if (!input_handler)
    return;

  input_handler->SelectAll();
  RecordAction(base::UserMetricsAction("SelectAll"));
}

void WebContentsImpl::CollapseSelection() {
  auto* input_handler = GetFocusedFrameInputHandler();
  if (!input_handler)
    return;

  input_handler->CollapseSelection();
}

void WebContentsImpl::Replace(const base::string16& word) {
  auto* input_handler = GetFocusedFrameInputHandler();
  if (!input_handler)
    return;

  input_handler->Replace(word);
}

void WebContentsImpl::ReplaceMisspelling(const base::string16& word) {
  auto* input_handler = GetFocusedFrameInputHandler();
  if (!input_handler)
    return;

  input_handler->ReplaceMisspelling(word);
}

void WebContentsImpl::NotifyContextMenuClosed(
    const CustomContextMenuContext& context) {
  RenderFrameHost* focused_frame = GetFocusedFrame();
  if (!focused_frame)
    return;

  focused_frame->Send(new FrameMsg_ContextMenuClosed(
      focused_frame->GetRoutingID(), context));
}

void WebContentsImpl::ExecuteCustomContextMenuCommand(
    int action, const CustomContextMenuContext& context) {
  RenderFrameHost* focused_frame = GetFocusedFrame();
  if (!focused_frame)
    return;

  focused_frame->Send(new FrameMsg_CustomContextMenuAction(
      focused_frame->GetRoutingID(), context, action));
}

gfx::NativeView WebContentsImpl::GetNativeView() {
  return view_->GetNativeView();
}

gfx::NativeView WebContentsImpl::GetContentNativeView() {
  return view_->GetContentNativeView();
}

gfx::NativeWindow WebContentsImpl::GetTopLevelNativeWindow() {
  return view_->GetTopLevelNativeWindow();
}

gfx::Rect WebContentsImpl::GetViewBounds() {
  return view_->GetViewBounds();
}

gfx::Rect WebContentsImpl::GetContainerBounds() {
  gfx::Rect rv;
  view_->GetContainerBounds(&rv);
  return rv;
}

DropData* WebContentsImpl::GetDropData() {
  return view_->GetDropData();
}

void WebContentsImpl::Focus() {
  view_->Focus();
}

void WebContentsImpl::SetInitialFocus() {
  view_->SetInitialFocus();
}

void WebContentsImpl::StoreFocus() {
  view_->StoreFocus();
}

void WebContentsImpl::RestoreFocus() {
  view_->RestoreFocus();
}

void WebContentsImpl::FocusThroughTabTraversal(bool reverse) {
  view_->FocusThroughTabTraversal(reverse);
}

bool WebContentsImpl::ShowingInterstitialPage() {
  return interstitial_page_ != nullptr;
}

InterstitialPageImpl* WebContentsImpl::GetInterstitialPage() {
  return interstitial_page_;
}

bool WebContentsImpl::IsSavable() {
  // WebKit creates Document object when MIME type is application/xhtml+xml,
  // so we also support this MIME type.
  return contents_mime_type_ == "text/html" ||
         contents_mime_type_ == "text/xml" ||
         contents_mime_type_ == "application/xhtml+xml" ||
         contents_mime_type_ == "text/plain" ||
         contents_mime_type_ == "text/css" ||
         blink::IsSupportedJavascriptMimeType(contents_mime_type_);
}

void WebContentsImpl::OnSavePage() {
  // If we can not save the page, try to download it.
  if (!IsSavable()) {
    download::RecordSavePackageEvent(
        download::SAVE_PACKAGE_DOWNLOAD_ON_NON_HTML);
    SaveFrame(GetLastCommittedURL(), Referrer());
    return;
  }

  Stop();

  // Create the save package and possibly prompt the user for the name to save
  // the page as. The user prompt is an asynchronous operation that runs on
  // another thread.
  save_package_ = new SavePackage(this);
  save_package_->GetSaveInfo();
}

// Used in automated testing to bypass prompting the user for file names.
// Instead, the names and paths are hard coded rather than running them through
// file name sanitation and extension / mime checking.
bool WebContentsImpl::SavePage(const base::FilePath& main_file,
                               const base::FilePath& dir_path,
                               SavePageType save_type) {
  // Stop the page from navigating.
  Stop();

  save_package_ = new SavePackage(this, save_type, main_file, dir_path);
  return save_package_->Init(SavePackageDownloadCreatedCallback());
}

void WebContentsImpl::SaveFrame(const GURL& url,
                                const Referrer& referrer) {
  SaveFrameWithHeaders(url, referrer, std::string(), base::string16());
}

void WebContentsImpl::SaveFrameWithHeaders(
    const GURL& url,
    const Referrer& referrer,
    const std::string& headers,
    const base::string16& suggested_filename) {
  // Check and see if the guest can handle this.
  if (delegate_) {
    WebContents* guest_web_contents = nullptr;
    if (browser_plugin_embedder_) {
      BrowserPluginGuest* guest = browser_plugin_embedder_->GetFullPageGuest();
      if (guest)
        guest_web_contents = guest->GetWebContents();
    } else if (browser_plugin_guest_) {
      guest_web_contents = this;
    }

    if (guest_web_contents && delegate_->GuestSaveFrame(guest_web_contents))
      return;
  }

  if (!GetLastCommittedURL().is_valid())
    return;
  if (delegate_ && delegate_->SaveFrame(url, referrer))
    return;

  // TODO(nasko): This check for main frame is incorrect and should be fixed
  // by explicitly passing in which frame this method should target. This would
  // indicate whether it's the main frame, and also tell us the frame pointer
  // to use for routing.
  bool is_main_frame = (url == GetLastCommittedURL());
  RenderFrameHost* frame_host = GetMainFrame();

  int64_t post_id = -1;
  if (is_main_frame) {
    NavigationEntry* entry = controller_.GetLastCommittedEntry();
    if (entry)
      post_id = entry->GetPostID();
  }
  net::NetworkTrafficAnnotationTag traffic_annotation =
      net::DefineNetworkTrafficAnnotation("download_web_contents_frame", R"(
        semantics {
          sender: "Save Page Action"
          description:
            "Saves the given frame's URL to the local file system."
          trigger:
            "The user has triggered a save operation on the frame through a "
            "context menu or other mechanism."
          data: "None."
          destination: WEBSITE
        }
        policy {
          cookies_allowed: YES
          cookies_store: "user"
          setting:
            "This feature cannot be disabled by settings, but it's is only "
            "triggered by user request."
          policy_exception_justification: "Not implemented."
        })");
  auto params = std::make_unique<download::DownloadUrlParameters>(
      url, frame_host->GetProcess()->GetID(),
      frame_host->GetRenderViewHost()->GetRoutingID(),
      frame_host->GetRoutingID(), traffic_annotation);
  params->set_referrer(referrer.url);
  params->set_referrer_policy(
      Referrer::ReferrerPolicyForUrlRequest(referrer.policy));
  params->set_post_id(post_id);
  if (post_id >= 0)
    params->set_method("POST");
  params->set_prompt(true);

  if (headers.empty()) {
    params->set_prefer_cache(true);
  } else {
    for (download::DownloadUrlParameters::RequestHeadersNameValuePair
             key_value : ParseDownloadHeaders(headers)) {
      params->add_request_header(key_value.first, key_value.second);
    }
  }
  params->set_suggested_name(suggested_filename);
  params->set_download_source(download::DownloadSource::WEB_CONTENTS_API);
  BrowserContext::GetDownloadManager(GetBrowserContext())
      ->DownloadUrl(std::move(params));
}

void WebContentsImpl::GenerateMHTML(
    const MHTMLGenerationParams& params,
    base::OnceCallback<void(int64_t)> callback) {
  MHTMLGenerationManager::GetInstance()->SaveMHTML(this, params,
                                                   std::move(callback));
}

const std::string& WebContentsImpl::GetContentsMimeType() {
  return contents_mime_type_;
}

bool WebContentsImpl::WillNotifyDisconnection() {
  return notify_disconnection_;
}

blink::mojom::RendererPreferences* WebContentsImpl::GetMutableRendererPrefs() {
  return &renderer_preferences_;
}

void WebContentsImpl::Close() {
  Close(GetRenderViewHost());
}

void WebContentsImpl::DragSourceEndedAt(float client_x,
                                        float client_y,
                                        float screen_x,
                                        float screen_y,
                                        blink::WebDragOperation operation,
                                        RenderWidgetHost* source_rwh) {
  if (browser_plugin_embedder_) {
    browser_plugin_embedder_->DragSourceEndedAt(
        client_x, client_y, screen_x, screen_y, operation);
  }
  if (source_rwh) {
    source_rwh->DragSourceEndedAt(gfx::PointF(client_x, client_y),
                                  gfx::PointF(screen_x, screen_y), operation);
  }
}

void WebContentsImpl::LoadStateChanged(
    const std::string& host,
    const net::LoadStateWithParam& load_state,
    uint64_t upload_position,
    uint64_t upload_size) {
  base::string16 host16 = url_formatter::IDNToUnicode(host);
  // Drop no-op updates.
  if (load_state_.state == load_state.state &&
      load_state_.param == load_state.param &&
      upload_position_ == upload_position && upload_size_ == upload_size &&
      load_state_host_ == host16) {
    return;
  }
  load_state_ = load_state;
  upload_position_ = upload_position;
  upload_size_ = upload_size;
  load_state_host_ = host16;
  if (load_state_.state == net::LOAD_STATE_READING_RESPONSE)
    SetNotWaitingForResponse();
  if (IsLoading()) {
    NotifyNavigationStateChanged(static_cast<InvalidateTypes>(
        INVALIDATE_TYPE_LOAD | INVALIDATE_TYPE_TAB));
  }
}

void WebContentsImpl::SetVisibility(Visibility visibility) {
  const Visibility previous_visibility = visibility_;
  visibility_ = visibility;

  // Notify observers if the visibility changed or if WasShown() is being called
  // for the first time.
  if (visibility != previous_visibility ||
      (visibility == Visibility::VISIBLE && !did_first_set_visible_)) {
    for (auto& observer : observers_)
      observer.OnVisibilityChanged(visibility);
  }
}

void WebContentsImpl::NotifyWebContentsFocused(
    RenderWidgetHost* render_widget_host) {
  for (auto& observer : observers_)
    observer.OnWebContentsFocused(render_widget_host);
}

void WebContentsImpl::NotifyWebContentsLostFocus(
    RenderWidgetHost* render_widget_host) {
  for (auto& observer : observers_)
    observer.OnWebContentsLostFocus(render_widget_host);
}

void WebContentsImpl::SystemDragEnded(RenderWidgetHost* source_rwh) {
  if (source_rwh)
    source_rwh->DragSourceSystemDragEnded();
  if (browser_plugin_embedder_)
    browser_plugin_embedder_->SystemDragEnded();
}

void WebContentsImpl::NavigatedByUser() {
  SendUserGestureForResourceDispatchHost();
}

void WebContentsImpl::SetClosedByUserGesture(bool value) {
  closed_by_user_gesture_ = value;
}

bool WebContentsImpl::GetClosedByUserGesture() {
  return closed_by_user_gesture_;
}

int WebContentsImpl::GetMinimumZoomPercent() {
  return minimum_zoom_percent_;
}

int WebContentsImpl::GetMaximumZoomPercent() {
  return maximum_zoom_percent_;
}

void WebContentsImpl::SetPageScale(float page_scale_factor) {
  GetRenderViewHost()->Send(new ViewMsg_SetPageScale(
      GetRenderViewHost()->GetRoutingID(), page_scale_factor));
}

gfx::Size WebContentsImpl::GetPreferredSize() {
  return IsBeingCaptured() ? preferred_size_for_capture_ : preferred_size_;
}

bool WebContentsImpl::GotResponseToLockMouseRequest(bool allowed) {
  if (!GuestMode::IsCrossProcessFrameGuest(GetWebContents()) &&
      GetBrowserPluginGuest())
    return GetBrowserPluginGuest()->LockMouse(allowed);

  if (mouse_lock_widget_) {
    if (mouse_lock_widget_->delegate()->GetAsWebContents() != this) {
      return mouse_lock_widget_->delegate()
          ->GetAsWebContents()
          ->GotResponseToLockMouseRequest(allowed);
    }

    if (mouse_lock_widget_->GotResponseToLockMouseRequest(allowed))
      return true;
  }

  for (WebContentsImpl* current = this; current;
       current = current->GetOuterWebContents()) {
    current->mouse_lock_widget_ = nullptr;
  }

  return false;
}

bool WebContentsImpl::GotResponseToKeyboardLockRequest(bool allowed) {
  if (!keyboard_lock_widget_)
    return false;

  if (keyboard_lock_widget_->delegate()->GetAsWebContents() != this) {
    NOTREACHED();
    return false;
  }

  // KeyboardLock is only supported when called by the top-level browsing
  // context and is not supported in embedded content scenarios.
  if (GetOuterWebContents())
    return false;

  keyboard_lock_widget_->GotResponseToKeyboardLockRequest(allowed);
  return true;
}

bool WebContentsImpl::HasOpener() {
  return GetOpener() != nullptr;
}

RenderFrameHostImpl* WebContentsImpl::GetOpener() {
  FrameTreeNode* opener_ftn = frame_tree_.root()->opener();
  return opener_ftn ? opener_ftn->current_frame_host() : nullptr;
}

bool WebContentsImpl::HasOriginalOpener() {
  return GetOriginalOpener() != nullptr;
}

RenderFrameHostImpl* WebContentsImpl::GetOriginalOpener() {
  FrameTreeNode* opener_ftn = frame_tree_.root()->original_opener();
  return opener_ftn ? opener_ftn->current_frame_host() : nullptr;
}

void WebContentsImpl::DidChooseColorInColorChooser(SkColor color) {
  color_chooser_->DidChooseColorInColorChooser(color);
}

void WebContentsImpl::DidEndColorChooser() {
  color_chooser_.reset();
}

int WebContentsImpl::DownloadImage(
    const GURL& url,
    bool is_favicon,
    uint32_t max_bitmap_size,
    bool bypass_cache,
    WebContents::ImageDownloadCallback callback) {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);
  static int next_image_download_id = 0;
  const blink::mojom::ImageDownloaderPtr& mojo_image_downloader =
      GetMainFrame()->GetMojoImageDownloader();
  const int download_id = ++next_image_download_id;
  if (!mojo_image_downloader) {
    // If the renderer process is dead (i.e. crash, or memory pressure on
    // Android), the downloader service will be invalid. Pre-Mojo, this would
    // hang the callback indefinitely since the IPC would be dropped. Now,
    // respond with a 400 HTTP error code to indicate that something went wrong.
    base::PostTaskWithTraits(
        FROM_HERE, {BrowserThread::UI},
        base::BindOnce(&WebContentsImpl::OnDidDownloadImage,
                       weak_factory_.GetWeakPtr(), std::move(callback),
                       download_id, url, 400, std::vector<SkBitmap>(),
                       std::vector<gfx::Size>()));
    return download_id;
  }

  mojo_image_downloader->DownloadImage(
      url, is_favicon, max_bitmap_size, bypass_cache,
      base::BindOnce(&WebContentsImpl::OnDidDownloadImage,
                     weak_factory_.GetWeakPtr(), std::move(callback),
                     download_id, url));
  return download_id;
}

void WebContentsImpl::Find(int request_id,
                           const base::string16& search_text,
                           blink::mojom::FindOptionsPtr options) {
  // Cowardly refuse to search for no text.
  if (search_text.empty()) {
    NOTREACHED();
    return;
  }

  GetOrCreateFindRequestManager()->Find(request_id, search_text,
                                        std::move(options));
}

void WebContentsImpl::StopFinding(StopFindAction action) {
  if (FindRequestManager* manager = GetFindRequestManager())
    manager->StopFinding(action);
}

bool WebContentsImpl::WasEverAudible() {
  return was_ever_audible_;
}

void WebContentsImpl::GetManifest(GetManifestCallback callback) {
  manifest_manager_host_->GetManifest(std::move(callback));
}

void WebContentsImpl::ExitFullscreen(bool will_cause_resize) {
  // Clean up related state and initiate the fullscreen exit.
  GetRenderViewHost()->GetWidget()->RejectMouseLockOrUnlockIfNecessary();
  ExitFullscreenMode(will_cause_resize);
}

void WebContentsImpl::ResumeLoadingCreatedWebContents() {
  if (delayed_load_url_params_.get()) {
    DCHECK(!delayed_open_url_params_);
    controller_.LoadURLWithParams(*delayed_load_url_params_.get());
    delayed_load_url_params_.reset(nullptr);
    return;
  }

  if (delayed_open_url_params_.get()) {
    OpenURL(*delayed_open_url_params_.get());
    delayed_open_url_params_.reset(nullptr);
    return;
  }

  // Resume blocked requests for both the RenderViewHost and RenderFrameHost.
  // TODO(brettw): It seems bogus to reach into here and initialize the host.
  if (is_resume_pending_) {
    is_resume_pending_ = false;
    GetRenderViewHost()->GetWidget()->Init();
    GetMainFrame()->Init();
  }
}

bool WebContentsImpl::FocusLocationBarByDefault() {
  if (should_focus_location_bar_by_default_)
    return true;

  return delegate_ && delegate_->ShouldFocusLocationBarByDefault(this);
}

void WebContentsImpl::SetFocusToLocationBar() {
  if (delegate_)
    delegate_->SetFocusToLocationBar();
}

void WebContentsImpl::DidStartNavigation(NavigationHandle* navigation_handle) {
  TRACE_EVENT1("navigation", "WebContentsImpl::DidStartNavigation",
               "navigation_handle", navigation_handle);
  for (auto& observer : observers_)
    observer.DidStartNavigation(navigation_handle);

  if (display_cutout_host_impl_)
    display_cutout_host_impl_->DidStartNavigation(navigation_handle);

  if (navigation_handle->IsInMainFrame()) {
    // When the browser is started with about:blank as the startup URL, focus
    // the location bar (which will also select its contents) so people can
    // simply begin typing to navigate elsewhere.
    //
    // We need to be careful not to trigger this for anything other than the
    // startup navigation. In particular, if we allow an attacker to open a
    // popup to about:blank, then navigate, focusing the Omnibox will cause the
    // end of the new URL to be scrolled into view instead of the start,
    // allowing the attacker to spoof other URLs. The conditions checked here
    // are all aimed at ensuring no such attacker-controlled navigation can
    // trigger this.
    should_focus_location_bar_by_default_ =
        controller_.IsInitialNavigation() &&
        !navigation_handle->IsRendererInitiated() &&
        navigation_handle->GetURL() == url::kAboutBlankURL;
  }
}

void WebContentsImpl::DidRedirectNavigation(
    NavigationHandle* navigation_handle) {
  TRACE_EVENT1("navigation", "WebContentsImpl::DidRedirectNavigation",
               "navigation_handle", navigation_handle);
  for (auto& observer : observers_)
    observer.DidRedirectNavigation(navigation_handle);

  // Notify accessibility if this is a reload. This has to called on the
  // BrowserAccessibilityManager associated with the old RFHI.
  if (navigation_handle->GetReloadType() != ReloadType::NONE) {
    NavigationHandleImpl* nhi =
        static_cast<NavigationHandleImpl*>(navigation_handle);
    BrowserAccessibilityManager* manager =
        nhi->frame_tree_node()
            ->current_frame_host()
            ->browser_accessibility_manager();
    if (manager)
      manager->UserIsReloading();
  }
}

void WebContentsImpl::ReadyToCommitNavigation(
    NavigationHandle* navigation_handle) {
  TRACE_EVENT1("navigation", "WebContentsImpl::ReadyToCommitNavigation",
               "navigation_handle", navigation_handle);
  for (auto& observer : observers_)
    observer.ReadyToCommitNavigation(navigation_handle);

  // If any domains are blocked from accessing 3D APIs because they may
  // have caused the GPU to reset recently, unblock them here if the user
  // initiated this navigation. This implies that the user was involved in
  // the decision to navigate, so there's no concern about
  // denial-of-service issues. Want to do this as early as
  // possible to avoid race conditions with pages attempting to access
  // WebGL early on.
  //
  // TODO(crbug.com/617904): currently navigations initiated by the browser
  // (reload button, reload menu option, pressing return in the Omnibox)
  // return false from HasUserGesture(). If or when that is addressed,
  // remove the check for IsRendererInitiated() below.
  //
  // TODO(crbug.com/832180): HasUserGesture comes from the renderer
  // process and isn't validated. Until it is, don't trust it.
  if (!navigation_handle->IsRendererInitiated()) {
    GpuDataManagerImpl::GetInstance()->UnblockDomainFrom3DAPIs(
        navigation_handle->GetURL());
  }

  if (navigation_handle->IsSameDocument())
    return;

  // SSLInfo is not needed on subframe navigations since the main-frame
  // certificate is the only one that can be inspected (using the info
  // bubble) without refreshing the page with DevTools open.
  // We don't call DidStartResourceResponse on net errors, since that results on
  // existing cert exceptions being revoked, which leads to weird behavior with
  // committed interstitials or while offline. We only need the error check for
  // the main frame case because unlike this method, SubresourceResponseStarted
  // does not get called on network errors.
  if (navigation_handle->IsInMainFrame() &&
      navigation_handle->GetNetErrorCode() == net::OK) {
    controller_.ssl_manager()->DidStartResourceResponse(
        navigation_handle->GetURL(),
        navigation_handle->GetSSLInfo().has_value()
            ? net::IsCertStatusError(
                  navigation_handle->GetSSLInfo()->cert_status)
            : false);
  }

  SetNotWaitingForResponse();
}

void WebContentsImpl::DidFinishNavigation(NavigationHandle* navigation_handle) {
  TRACE_EVENT1("navigation", "WebContentsImpl::DidFinishNavigation",
               "navigation_handle", navigation_handle);

  for (auto& observer : observers_)
    observer.DidFinishNavigation(navigation_handle);

  if (display_cutout_host_impl_)
    display_cutout_host_impl_->DidFinishNavigation(navigation_handle);

  if (navigation_handle->HasCommitted()) {
    // TODO(domfarolino, dmazzoni): Do this using WebContentsObserver. See
    // https://crbug.com/981271.
    BrowserAccessibilityManager* manager =
        static_cast<RenderFrameHostImpl*>(
            navigation_handle->GetRenderFrameHost())
            ->browser_accessibility_manager();
    if (manager) {
      if (navigation_handle->IsErrorPage()) {
        manager->NavigationFailed();
      } else {
        manager->NavigationSucceeded();
      }
    }

    if (navigation_handle->IsInMainFrame() &&
        !navigation_handle->IsSameDocument()) {
      was_ever_audible_ = false;
      last_committed_source_id_ =
          ukm::ConvertToSourceId(navigation_handle->GetNavigationId(),
                                 ukm::SourceIdType::NAVIGATION_ID);
    }
  }

  // If we didn't end up on about:blank after setting this in DidStartNavigation
  // then don't focus the location bar.
  if (should_focus_location_bar_by_default_ &&
      navigation_handle->GetURL() != url::kAboutBlankURL) {
    should_focus_location_bar_by_default_ = false;
  }
}

void WebContentsImpl::DidFailLoadWithError(
    RenderFrameHostImpl* render_frame_host,
    const GURL& url,
    int error_code,
    const base::string16& error_description) {
  for (auto& observer : observers_) {
    observer.DidFailLoad(render_frame_host, url, error_code, error_description);
  }
}

void WebContentsImpl::NotifyChangedNavigationState(
    InvalidateTypes changed_flags) {
  NotifyNavigationStateChanged(changed_flags);
}

void WebContentsImpl::DidStartNavigationToPendingEntry(const GURL& url,
                                                       ReloadType reload_type) {
  // Notify observers about navigation.
  for (auto& observer : observers_)
    observer.DidStartNavigationToPendingEntry(url, reload_type);
}

bool WebContentsImpl::ShouldTransferNavigation(bool is_main_frame_navigation) {
  if (!delegate_)
    return true;
  return delegate_->ShouldTransferNavigation(is_main_frame_navigation);
}

bool WebContentsImpl::ShouldPreserveAbortedURLs() {
  if (!delegate_)
    return false;
  return delegate_->ShouldPreserveAbortedURLs(this);
}

void WebContentsImpl::DidNavigateMainFramePreCommit(
    bool navigation_is_within_page) {
  // Ensure fullscreen mode is exited before committing the navigation to a
  // different page.  The next page will not start out assuming it is in
  // fullscreen mode.
  if (navigation_is_within_page) {
    // No page change?  Then, the renderer and browser can remain in fullscreen.
    return;
  }
  if (IsFullscreenForCurrentTab())
    ExitFullscreen(false);
  DCHECK(!IsFullscreenForCurrentTab());

  // Clean up keyboard lock state when navigating.
  CancelKeyboardLock(keyboard_lock_widget_);
}

void WebContentsImpl::DidNavigateMainFramePostCommit(
    RenderFrameHostImpl* render_frame_host,
    const LoadCommittedDetails& details,
    const FrameHostMsg_DidCommitProvisionalLoad_Params& params) {
  if (details.is_navigation_to_different_page()) {
    // Clear the status bubble. This is a workaround for a bug where WebKit
    // doesn't let us know that the cursor left an element during a
    // transition (this is also why the mouse cursor remains as a hand after
    // clicking on a link); see bugs 1184641 and 980803. We don't want to
    // clear the bubble when a user navigates to a named anchor in the same
    // page.
    ClearTargetURL();

    RenderWidgetHostViewBase* rwhvb =
        static_cast<RenderWidgetHostViewBase*>(GetRenderWidgetHostView());
    if (rwhvb)
      rwhvb->OnDidNavigateMainFrameToNewPage();

    did_first_visually_non_empty_paint_ = false;

    // Reset theme color on navigation to new page.
    theme_color_.reset();
  }

  if (delegate_)
    delegate_->DidNavigateMainFramePostCommit(this);
  view_->SetOverscrollControllerEnabled(CanOverscrollContent());

  if (!details.is_same_document && GetInnerWebContents().empty())
    had_inner_webcontents_ = false;
}

void WebContentsImpl::DidNavigateAnyFramePostCommit(
    RenderFrameHostImpl* render_frame_host,
    const LoadCommittedDetails& details,
    const FrameHostMsg_DidCommitProvisionalLoad_Params& params) {
  // Now that something has committed, we don't need to track whether the
  // initial page has been accessed.
  has_accessed_initial_document_ = false;

  // If we navigate off the page, close all JavaScript dialogs.
  if (!details.is_same_document)
    CancelActiveAndPendingDialogs();

  // If this is a user-initiated navigation, start allowing JavaScript dialogs
  // again.
  if (params.gesture == NavigationGestureUser && dialog_manager_) {
    dialog_manager_->CancelDialogs(this, /*reset_state=*/true);
  }
}

void WebContentsImpl::SetMainFrameMimeType(const std::string& mime_type) {
  contents_mime_type_ = mime_type;
}

bool WebContentsImpl::CanOverscrollContent() const {
  // Disable overscroll when touch emulation is on. See crbug.com/369938.
  if (force_disable_overscroll_content_)
    return false;

  if (delegate_)
    return delegate_->CanOverscrollContent();

  return false;
}

void WebContentsImpl::OnThemeColorChanged(RenderFrameHostImpl* source,
                                          base::Optional<SkColor> theme_color) {
  if (source != GetMainFrame()) {
    // Only the main frame may control the theme.
    return;
  }

  // Update the theme color. This is to be published to observers after the
  // first visually non-empty paint.
  theme_color_ = theme_color;

  if (did_first_visually_non_empty_paint_ &&
      last_sent_theme_color_ != theme_color_) {
    for (auto& observer : observers_)
      observer.DidChangeThemeColor(theme_color_);
    last_sent_theme_color_ = theme_color_;
  }
}

void WebContentsImpl::OnDidLoadResourceFromMemoryCache(
    RenderFrameHostImpl* source,
    const GURL& url,
    const std::string& http_method,
    const std::string& mime_type,
    const base::Optional<url::Origin>& top_frame_origin,
    ResourceType resource_type) {
  for (auto& observer : observers_)
    observer.DidLoadResourceFromMemoryCache(url, mime_type, resource_type);

  if (url.is_valid() && url.SchemeIsHTTPOrHTTPS()) {
    StoragePartition* partition = source->GetProcess()->GetStoragePartition();

    // We require different paths here because there is no NetworkContext
    // for media cache.
    if (base::FeatureList::IsEnabled(network::features::kNetworkService)) {
      partition->GetNetworkContext()->NotifyExternalCacheHit(url, http_method,
                                                             top_frame_origin);
    } else {
      scoped_refptr<net::URLRequestContextGetter> request_context(
          resource_type == ResourceType::kMedia
              ? partition->GetMediaURLRequestContext()
              : partition->GetURLRequestContext());
      base::PostTaskWithTraits(
          FROM_HERE, {BrowserThread::IO},
          base::BindOnce(&NotifyCacheOnIO, request_context, url, http_method,
                         top_frame_origin));
    }
  }
}

void WebContentsImpl::OnDidDisplayInsecureContent(RenderFrameHostImpl* source) {
  // Any frame can trigger display of insecure content, so we don't check
  // |source| here.
  DidDisplayInsecureContent();
}

void WebContentsImpl::DidDisplayInsecureContent() {
  controller_.ssl_manager()->DidDisplayMixedContent();
}

void WebContentsImpl::OnDidContainInsecureFormAction(
    RenderFrameHostImpl* source) {
  controller_.ssl_manager()->DidContainInsecureFormAction();
}

void WebContentsImpl::OnDidRunInsecureContent(RenderFrameHostImpl* source,
                                              const GURL& security_origin,
                                              const GURL& target_url) {
  // TODO(nick, estark): Should we call FilterURL using |source|'s process on
  // these parameters? |target_url| seems unused, except for a log message. And
  // |security_origin| might be replaceable with the origin of the main frame.
  DidRunInsecureContent(security_origin, target_url);
}

void WebContentsImpl::DidRunInsecureContent(const GURL& security_origin,
                                            const GURL& target_url) {
  LOG(WARNING) << security_origin << " ran insecure content from "
               << target_url.possibly_invalid_spec();
  RecordAction(base::UserMetricsAction("SSL.RanInsecureContent"));
  if (base::EndsWith(security_origin.spec(), kDotGoogleDotCom,
                     base::CompareCase::INSENSITIVE_ASCII))
    RecordAction(base::UserMetricsAction("SSL.RanInsecureContentGoogle"));
  controller_.ssl_manager()->DidRunMixedContent(security_origin);
}

void WebContentsImpl::PassiveInsecureContentFound(const GURL& resource_url) {
  if (delegate_) {
    delegate_->PassiveInsecureContentFound(resource_url);
  }
}

bool WebContentsImpl::ShouldAllowRunningInsecureContent(
    WebContents* web_contents,
    bool allowed_per_prefs,
    const url::Origin& origin,
    const GURL& resource_url) {
  if (delegate_) {
    return delegate_->ShouldAllowRunningInsecureContent(
        web_contents, allowed_per_prefs, origin, resource_url);
  }

  return allowed_per_prefs;
}

void WebContentsImpl::ViewSource(RenderFrameHostImpl* frame) {
  DCHECK_EQ(this, WebContents::FromRenderFrameHost(frame));

  // Don't do anything if there is no |delegate_| that could accept and show the
  // new WebContents containing the view-source.
  if (!delegate_)
    return;

  // Use the last committed entry, since the pending entry hasn't loaded yet and
  // won't be copied into the cloned tab.
  NavigationEntryImpl* last_committed_entry =
      static_cast<NavigationEntryImpl*>(frame->frame_tree_node()
                                            ->navigator()
                                            ->GetController()
                                            ->GetLastCommittedEntry());
  if (!last_committed_entry)
    return;

  FrameNavigationEntry* frame_entry =
      last_committed_entry->GetFrameEntry(frame->frame_tree_node());
  if (!frame_entry)
    return;

  // Any new WebContents opened while this WebContents is in fullscreen can be
  // used to confuse the user, so drop fullscreen.
  ForSecurityDropFullscreen();

  // We intentionally don't share the SiteInstance with the original frame so
  // that view source has a consistent process model and always ends up in a new
  // process (https://crbug.com/699493).
  scoped_refptr<SiteInstanceImpl> site_instance_for_view_source = nullptr;
  // Referrer and initiator are not important, because view-source should not
  // hit the network, but should be served from the cache instead.
  Referrer referrer_for_view_source;
  base::Optional<url::Origin> initiator_for_view_source = base::nullopt;
  // Do not restore title, derive it from the url.
  base::string16 title_for_view_source;
  auto navigation_entry = std::make_unique<NavigationEntryImpl>(
      site_instance_for_view_source, frame_entry->url(),
      referrer_for_view_source, initiator_for_view_source,
      title_for_view_source, ui::PAGE_TRANSITION_LINK,
      /* is_renderer_initiated = */ false,
      /* blob_url_loader_factory = */ nullptr);
  navigation_entry->SetVirtualURL(GURL(content::kViewSourceScheme +
                                       std::string(":") +
                                       frame_entry->url().spec()));

  // Do not restore scroller position.
  // TODO(creis, lukasza, arthursonzogni): Do not reuse the original PageState,
  // but start from a new one and only copy the needed data.
  const PageState& new_page_state =
      frame_entry->page_state().RemoveScrollOffset();

  scoped_refptr<FrameNavigationEntry> new_frame_entry =
      navigation_entry->root_node()->frame_entry;
  new_frame_entry->set_method(frame_entry->method());
  new_frame_entry->SetPageState(new_page_state);

  // Create a new WebContents, which is used to display the source code.
  std::unique_ptr<WebContents> view_source_contents =
      Create(CreateParams(GetBrowserContext()));

  // Restore the previously created NavigationEntry.
  std::vector<std::unique_ptr<NavigationEntry>> navigation_entries;
  navigation_entries.push_back(std::move(navigation_entry));
  view_source_contents->GetController().Restore(0, RestoreType::CURRENT_SESSION,
                                                &navigation_entries);

  // Add |view_source_contents| as a new tab.
  gfx::Rect initial_rect;
  constexpr bool kUserGesture = true;
  bool ignored_was_blocked;
  delegate_->AddNewContents(this, std::move(view_source_contents),
                            WindowOpenDisposition::NEW_FOREGROUND_TAB,
                            initial_rect, kUserGesture, &ignored_was_blocked);
  // Note that the |delegate_| could have deleted |view_source_contents| during
  // AddNewContents method call.
}

void WebContentsImpl::SubresourceResponseStarted(const GURL& url,
                                                 net::CertStatus cert_status) {
  controller_.ssl_manager()->DidStartResourceResponse(url, cert_status);
  SetNotWaitingForResponse();
}

void WebContentsImpl::ResourceLoadComplete(
    RenderFrameHost* render_frame_host,
    const GlobalRequestID& request_id,
    mojom::ResourceLoadInfoPtr resource_load_info) {
  for (auto& observer : observers_) {
    observer.ResourceLoadComplete(render_frame_host, request_id,
                                  *resource_load_info);
  }
}

void WebContentsImpl::PrintCrossProcessSubframe(
    const gfx::Rect& rect,
    int document_cookie,
    RenderFrameHost* subframe_host) {
  auto* outer_contents = GetOuterWebContents();
  if (outer_contents) {
    // When an extension or app page is printed, the content should be
    // composited with outer content, so the outer contents should handle the
    // print request.
    outer_contents->PrintCrossProcessSubframe(rect, document_cookie,
                                              subframe_host);
    return;
  }

  // If there is no delegate such as in tests or during deletion, do nothing.
  if (!delegate_)
    return;

  delegate_->PrintCrossProcessSubframe(this, rect, document_cookie,
                                       subframe_host);
}

#if defined(OS_ANDROID)
base::android::ScopedJavaLocalRef<jobject>
WebContentsImpl::GetJavaRenderFrameHostDelegate() {
  return GetJavaWebContents();
}
#endif

void WebContentsImpl::OnDidDisplayContentWithCertificateErrors(
    RenderFrameHostImpl* source) {
  controller_.ssl_manager()->DidDisplayContentWithCertErrors();
}

void WebContentsImpl::OnDidRunContentWithCertificateErrors(
    RenderFrameHostImpl* source) {
  // TODO(nick, estark): Do we need to consider |source| here somehow?
  NavigationEntry* entry = controller_.GetVisibleEntry();
  if (!entry)
    return;

  // TODO(estark): check that this does something reasonable for
  // about:blank and sandboxed origins. https://crbug.com/609527
  controller_.ssl_manager()->DidRunContentWithCertErrors(
      entry->GetURL().GetOrigin());
}

void WebContentsImpl::OnDocumentLoadedInFrame(RenderFrameHostImpl* source) {
  for (auto& observer : observers_)
    observer.DocumentLoadedInFrame(source);
}

void WebContentsImpl::OnDidFinishLoad(RenderFrameHostImpl* source,
                                      const GURL& url) {
  GURL validated_url(url);
  source->GetProcess()->FilterURL(false, &validated_url);

  for (auto& observer : observers_)
    observer.DidFinishLoad(source, validated_url);
}

void WebContentsImpl::OnGoToEntryAtOffset(RenderFrameHostImpl* source,
                                          int offset,
                                          bool has_user_gesture) {
  // Non-user initiated navigations coming from the renderer should be ignored
  // if there is an ongoing browser-initiated navigation.
  // See https://crbug.com/879965.
  // TODO(arthursonzogni): See if this should check for ongoing navigations in
  // the frame(s) affected by the session history navigation, rather than just
  // the main frame.
  if (!has_user_gesture) {
    NavigationRequest* ongoing_navigation_request =
        frame_tree_.root()->navigation_request();
    if (ongoing_navigation_request &&
        ongoing_navigation_request->browser_initiated()) {
      return;
    }
  }

  // All frames are allowed to navigate the global history.
  if (!delegate_ || delegate_->OnGoToEntryOffset(offset)) {
    if (source->IsSandboxed(blink::WebSandboxFlags::kTopNavigation)) {
      // Keep track of whether this is a session history from a sandboxed iframe
      // with top level navigation disallowed.
      controller_.GoToOffsetInSandboxedFrame(offset,
                                             source->GetFrameTreeNodeId());
    } else {
      controller_.GoToOffset(offset);
    }
  }
}

void WebContentsImpl::OnUpdateZoomLimits(RenderViewHostImpl* source,
                                         int minimum_percent,
                                         int maximum_percent) {
  minimum_zoom_percent_ = minimum_percent;
  maximum_zoom_percent_ = maximum_percent;
}

void WebContentsImpl::OnPageScaleFactorChanged(RenderViewHostImpl* source,
                                               float page_scale_factor) {
#if !defined(OS_ANDROID)
  // While page scale factor is used on mobile, this PageScaleFactorIsOne logic
  // is only needed on desktop.
  bool is_one = page_scale_factor == 1.f;
  if (is_one != page_scale_factor_is_one_) {
    page_scale_factor_is_one_ = is_one;

    HostZoomMapImpl* host_zoom_map =
        static_cast<HostZoomMapImpl*>(HostZoomMap::GetForWebContents(this));

    if (host_zoom_map) {
      host_zoom_map->SetPageScaleFactorIsOneForView(
          source->GetProcess()->GetID(), source->GetRoutingID(),
          page_scale_factor_is_one_);
    }
  }
#endif  // !defined(OS_ANDROID)

  for (auto& observer : observers_)
    observer.OnPageScaleFactorChanged(page_scale_factor);
}

void WebContentsImpl::OnTextAutosizerPageInfoChanged(
    RenderViewHostImpl* source,
    const blink::WebTextAutosizerPageInfo& page_info) {
  // Keep a copy of |page_info| in case we create a new RenderView before
  // the next update.
  text_autosizer_page_info_ = page_info;
  frame_tree_.root()->render_manager()->SendPageMessage(
      new PageMsg_UpdateTextAutosizerPageInfoForRemoteMainFrames(
          MSG_ROUTING_NONE, page_info),
      source->GetSiteInstance());
}

void WebContentsImpl::EnumerateDirectory(
    RenderFrameHost* render_frame_host,
    std::unique_ptr<FileSelectListener> listener,
    const base::FilePath& directory_path) {
  if (delegate_)
    delegate_->EnumerateDirectory(this, std::move(listener), directory_path);
  else
    listener->FileSelectionCanceled();
}

void WebContentsImpl::OnRegisterProtocolHandler(RenderFrameHostImpl* source,
                                                const std::string& protocol,
                                                const GURL& url,
                                                const base::string16& title,
                                                bool user_gesture) {
  // TODO(nick): Should we consider |source| here or pass it to the delegate?
  // TODO(nick): Do we need to apply FilterURL to |url|?
  if (!delegate_)
    return;

  if (!AreValidRegisterProtocolHandlerArguments(
          protocol, url, source->GetLastCommittedOrigin())) {
    ReceivedBadMessage(source->GetProcess(),
                       bad_message::REGISTER_PROTOCOL_HANDLER_INVALID_URL);
    return;
  }

  delegate_->RegisterProtocolHandler(this, protocol, url, user_gesture);
}

void WebContentsImpl::OnUnregisterProtocolHandler(RenderFrameHostImpl* source,
                                                  const std::string& protocol,
                                                  const GURL& url,
                                                  bool user_gesture) {
  // TODO(nick): Should we consider |source| here or pass it to the delegate?
  // TODO(nick): Do we need to apply FilterURL to |url|?
  if (!delegate_)
    return;

  if (!AreValidRegisterProtocolHandlerArguments(
          protocol, url, source->GetLastCommittedOrigin())) {
    ReceivedBadMessage(source->GetProcess(),
                       bad_message::REGISTER_PROTOCOL_HANDLER_INVALID_URL);
    return;
  }

  delegate_->UnregisterProtocolHandler(this, protocol, url, user_gesture);
}

void WebContentsImpl::OnUpdatePageImportanceSignals(
    RenderFrameHostImpl* source,
    const PageImportanceSignals& signals) {
  // TODO(nick, kouhei): Fix this for oopifs; currently all frames' state gets
  // written to this one field.
  page_importance_signals_ = signals;
}

void WebContentsImpl::OnDomOperationResponse(RenderFrameHostImpl* source,
                                             const std::string& json_string) {
  // TODO(nick, lukasza): The notification below should probably be updated to
  // include |source|.
  std::string json = json_string;
  NotificationService::current()->Notify(NOTIFICATION_DOM_OPERATION_RESPONSE,
                                         Source<WebContents>(this),
                                         Details<std::string>(&json));
}

void WebContentsImpl::OnAppCacheAccessed(const GURL& manifest_url,
                                         bool blocked_by_policy) {
  // TODO(nick): Should we consider |source| here? Should we call FilterURL on
  // |manifest_url|?

  // Notify observers about navigation.
  for (auto& observer : observers_)
    observer.AppCacheAccessed(manifest_url, blocked_by_policy);
}

void WebContentsImpl::OnColorChooserFactoryRequest(
    blink::mojom::ColorChooserFactoryRequest request) {
  color_chooser_factory_bindings_.AddBinding(this, std::move(request));
}

void WebContentsImpl::OpenColorChooser(
    blink::mojom::ColorChooserRequest chooser_request,
    blink::mojom::ColorChooserClientPtr client,
    SkColor color,
    std::vector<blink::mojom::ColorSuggestionPtr> suggestions) {
  content::ColorChooser* new_color_chooser =
      delegate_ ? delegate_->OpenColorChooser(this, color, suggestions)
                : nullptr;
  if (!new_color_chooser)
    return;

  color_chooser_.reset();
  color_chooser_ = std::make_unique<ColorChooser>(
      new_color_chooser, std::move(chooser_request), std::move(client));
}

#if BUILDFLAG(ENABLE_PLUGINS)
void WebContentsImpl::OnPepperInstanceCreated(RenderFrameHostImpl* source,
                                              int32_t pp_instance) {
  for (auto& observer : observers_)
    observer.PepperInstanceCreated();
  pepper_playback_observer_->PepperInstanceCreated(source, pp_instance);
}

void WebContentsImpl::OnPepperInstanceDeleted(RenderFrameHostImpl* source,
                                              int32_t pp_instance) {
  for (auto& observer : observers_)
    observer.PepperInstanceDeleted();
  pepper_playback_observer_->PepperInstanceDeleted(source, pp_instance);
}

void WebContentsImpl::OnPepperPluginHung(RenderFrameHostImpl* source,
                                         int plugin_child_id,
                                         const base::FilePath& path,
                                         bool is_hung) {
  UMA_HISTOGRAM_COUNTS_1M("Pepper.PluginHung", 1);

  for (auto& observer : observers_)
    observer.PluginHungStatusChanged(plugin_child_id, path, is_hung);
}

void WebContentsImpl::OnPepperStartsPlayback(RenderFrameHostImpl* source,
                                             int32_t pp_instance) {
  pepper_playback_observer_->PepperStartsPlayback(source, pp_instance);
}

void WebContentsImpl::OnPepperStopsPlayback(RenderFrameHostImpl* source,
                                            int32_t pp_instance) {
  pepper_playback_observer_->PepperStopsPlayback(source, pp_instance);
}

void WebContentsImpl::OnPluginCrashed(RenderFrameHostImpl* source,
                                      const base::FilePath& plugin_path,
                                      base::ProcessId plugin_pid) {
  // TODO(nick): Eliminate the |plugin_pid| parameter, which can't be trusted,
  // and is only used by BlinkTestController.
  for (auto& observer : observers_)
    observer.PluginCrashed(plugin_path, plugin_pid);
}

void WebContentsImpl::OnRequestPpapiBrokerPermission(
    RenderViewHostImpl* source,
    int ppb_broker_route_id,
    const GURL& url,
    const base::FilePath& plugin_path) {
  base::OnceCallback<void(bool)> permission_result_callback = base::BindOnce(
      &WebContentsImpl::SendPpapiBrokerPermissionResult, base::Unretained(this),
      source->GetProcess()->GetID(), ppb_broker_route_id);
  if (!delegate_) {
    std::move(permission_result_callback).Run(false);
    return;
  }

  delegate_->RequestPpapiBrokerPermission(
      this, url, plugin_path, std::move(permission_result_callback));
}

void WebContentsImpl::SendPpapiBrokerPermissionResult(int process_id,
                                                      int ppb_broker_route_id,
                                                      bool result) {
  RenderProcessHost* rph = RenderProcessHost::FromID(process_id);
  if (rph) {
    // TODO(nick): Convert this from ViewMsg_ to a Ppapi msg, since it
    // is not routed to a RenderView.
    rph->Send(
        new ViewMsg_PpapiBrokerPermissionResult(ppb_broker_route_id, result));
  }
}

void WebContentsImpl::OnBrowserPluginMessage(RenderFrameHost* render_frame_host,
                                             const IPC::Message& message) {
  CHECK(!browser_plugin_embedder_);
  CreateBrowserPluginEmbedderIfNecessary();
  browser_plugin_embedder_->OnMessageReceived(message, render_frame_host);
}
#endif  // BUILDFLAG(ENABLE_PLUGINS)

void WebContentsImpl::OnUpdateFaviconURL(
    RenderFrameHostImpl* source,
    const std::vector<FaviconURL>& candidates) {
  // Ignore favicons for non-main frame.
  if (source->GetParent()) {
    NOTREACHED();
    return;
  }

  // We get updated favicon URLs after the page stops loading. If a cross-site
  // navigation occurs while a page is still loading, the initial page
  // may stop loading and send us updated favicon URLs after the navigation
  // for the new page has committed.
  if (!source->IsCurrent())
    return;

  for (auto& observer : observers_)
    observer.DidUpdateFaviconURL(candidates);
}

void WebContentsImpl::SetIsOverlayContent(bool is_overlay_content) {
  is_overlay_content_ = is_overlay_content;
}

void WebContentsImpl::DidFirstVisuallyNonEmptyPaint(
    RenderViewHostImpl* source) {
  // Set |did_first_visually_non_empty_paint_| before notifying observers so
  // they can see that CompletedFirstVisuallyNonEmptyPaint() is true.
  did_first_visually_non_empty_paint_ = true;

  // TODO(nick): When this is ported to FrameHostMsg_, we should only listen if
  // |source| is the main frame.
  for (auto& observer : observers_)
    observer.DidFirstVisuallyNonEmptyPaint();

  if (theme_color_ != last_sent_theme_color_) {
    // Theme color should have updated by now if there was one.
    for (auto& observer : observers_)
      observer.DidChangeThemeColor(theme_color_);
    last_sent_theme_color_ = theme_color_;
  }
}

void WebContentsImpl::DidCommitAndDrawCompositorFrame(
    RenderViewHostImpl* source) {
  for (auto& observer : observers_)
    observer.DidCommitAndDrawCompositorFrame();
}

bool WebContentsImpl::IsPortal() const {
  return portal();
}

void WebContentsImpl::NotifyBeforeFormRepostWarningShow() {
  for (auto& observer : observers_)
    observer.BeforeFormRepostWarningShow();
}

void WebContentsImpl::ActivateAndShowRepostFormWarningDialog() {
  Activate();
  if (delegate_)
    delegate_->ShowRepostFormWarningDialog(this);
}

bool WebContentsImpl::HasAccessedInitialDocument() {
  return has_accessed_initial_document_;
}

void WebContentsImpl::UpdateTitleForEntry(NavigationEntry* entry,
                                          const base::string16& title) {
  base::string16 final_title;
  base::TrimWhitespace(title, base::TRIM_ALL, &final_title);

  // If a page is created via window.open and never navigated,
  // there will be no navigation entry. In this situation,
  // |page_title_when_no_navigation_entry_| will be used for page title.
  if (entry) {
    if (final_title == entry->GetTitle())
      return;  // Nothing changed, don't bother.

    entry->SetTitle(final_title);

    // The title for display may differ from the title just set; grab it.
    final_title = entry->GetTitleForDisplay();
  } else {
    if (page_title_when_no_navigation_entry_ == final_title)
      return;  // Nothing changed, don't bother.

    page_title_when_no_navigation_entry_ = final_title;
  }

  // Lastly, set the title for the view.
  view_->SetPageTitle(final_title);

  for (auto& observer : observers_)
    observer.TitleWasSet(entry);

  // Broadcast notifications when the UI should be updated.
  if (entry == controller_.GetEntryAtOffset(0))
    NotifyNavigationStateChanged(INVALIDATE_TYPE_TITLE);
}

void WebContentsImpl::SendChangeLoadProgress() {
  loading_last_progress_update_ = base::TimeTicks::Now();
  if (delegate_)
    delegate_->LoadProgressChanged(this, frame_tree_.load_progress());
}

void WebContentsImpl::ResetLoadProgressState() {
  frame_tree_.ResetLoadProgress();
  loading_weak_factory_.InvalidateWeakPtrs();
  loading_last_progress_update_ = base::TimeTicks();
}

// Notifies the RenderWidgetHost instance about the fact that the page is
// loading, or done loading.
void WebContentsImpl::LoadingStateChanged(bool to_different_document,
                                          bool due_to_interstitial,
                                          LoadNotificationDetails* details) {
  if (is_being_destroyed_)
    return;
  // Do not send notifications about loading changes in the FrameTree while the
  // interstitial page is pausing the throbber.
  if (ShowingInterstitialPage() && interstitial_page_->pause_throbber() &&
      !due_to_interstitial) {
    return;
  }

  bool is_loading = IsLoading();

  if (!is_loading) {
    load_state_ = net::LoadStateWithParam(net::LOAD_STATE_IDLE,
                                          base::string16());
    load_state_host_.clear();
    upload_size_ = 0;
    upload_position_ = 0;
  }

  GetRenderManager()->SetIsLoading(is_loading);

  waiting_for_response_ = is_loading;
  is_load_to_different_document_ = to_different_document;

  if (delegate_)
    delegate_->LoadingStateChanged(this, to_different_document);
  NotifyNavigationStateChanged(INVALIDATE_TYPE_LOAD);

  std::string url = (details ? details->url.possibly_invalid_spec() : "NULL");
  if (is_loading) {
    TRACE_EVENT_ASYNC_BEGIN2("browser,navigation", "WebContentsImpl Loading",
                             this, "URL", url, "Main FrameTreeNode id",
                             GetFrameTree()->root()->frame_tree_node_id());
    for (auto& observer : observers_)
      observer.DidStartLoading();
  } else {
    TRACE_EVENT_ASYNC_END1("browser,navigation", "WebContentsImpl Loading",
                           this, "URL", url);
    for (auto& observer : observers_)
      observer.DidStopLoading();
  }

  // TODO(avi): Remove. http://crbug.com/170921
  int type = is_loading ? NOTIFICATION_LOAD_START : NOTIFICATION_LOAD_STOP;
  NotificationDetails det = NotificationService::NoDetails();
  if (details)
      det = Details<LoadNotificationDetails>(details);
  NotificationService::current()->Notify(
      type, Source<NavigationController>(&controller_), det);
}

void WebContentsImpl::NotifyViewSwapped(RenderViewHost* old_host,
                                        RenderViewHost* new_host) {
  // After sending out a swap notification, we need to send a disconnect
  // notification so that clients that pick up a pointer to |this| can NULL the
  // pointer.  See Bug 1230284.
  notify_disconnection_ = true;
  for (auto& observer : observers_)
    observer.RenderViewHostChanged(old_host, new_host);

  view_->RenderViewHostChanged(old_host, new_host);

  // If this is an inner WebContents that has swapped views, we need to reattach
  // it to its outer WebContents.
  if (node_.outer_web_contents())
    ReattachToOuterWebContentsFrame();

  // Ensure that the associated embedder gets cleared after a RenderViewHost
  // gets swapped, so we don't reuse the same embedder next time a
  // RenderViewHost is attached to this WebContents.
  RemoveBrowserPluginEmbedder();
}

void WebContentsImpl::NotifyFrameSwapped(RenderFrameHost* old_host,
                                         RenderFrameHost* new_host,
                                         bool is_main_frame) {
#if defined(OS_ANDROID)
  // Copy importance from |old_host| if |new_host| is a main frame.
  if (old_host && !new_host->GetParent()) {
    static_cast<RenderFrameHostImpl*>(new_host)
        ->GetRenderWidgetHost()
        ->SetImportance(static_cast<RenderFrameHostImpl*>(old_host)
                            ->GetRenderWidgetHost()
                            ->importance());
  }
#endif
  for (auto& observer : observers_)
    observer.RenderFrameHostChanged(old_host, new_host);
}

// TODO(avi): Remove this entire function because this notification is already
// covered by two observer functions. http://crbug.com/170921
void WebContentsImpl::NotifyDisconnected() {
  if (!notify_disconnection_)
    return;

  notify_disconnection_ = false;
  NotificationService::current()->Notify(
      NOTIFICATION_WEB_CONTENTS_DISCONNECTED,
      Source<WebContents>(this),
      NotificationService::NoDetails());
}

void WebContentsImpl::NotifyNavigationEntryCommitted(
    const LoadCommittedDetails& load_details) {
  for (auto& observer : observers_)
    observer.NavigationEntryCommitted(load_details);
}

void WebContentsImpl::NotifyNavigationEntryChanged(
    const EntryChangedDetails& change_details) {
  for (auto& observer : observers_)
    observer.NavigationEntryChanged(change_details);
}

void WebContentsImpl::NotifyNavigationListPruned(
    const PrunedDetails& pruned_details) {
  for (auto& observer : observers_)
    observer.NavigationListPruned(pruned_details);
}

void WebContentsImpl::NotifyNavigationEntriesDeleted() {
  for (auto& observer : observers_)
    observer.NavigationEntriesDeleted();
}

void WebContentsImpl::OnAssociatedInterfaceRequest(
    RenderFrameHost* render_frame_host,
    const std::string& interface_name,
    mojo::ScopedInterfaceEndpointHandle handle) {
  auto it = binding_sets_.find(interface_name);
  if (it != binding_sets_.end())
    it->second->OnRequestForFrame(render_frame_host, std::move(handle));
}

void WebContentsImpl::OnInterfaceRequest(
    RenderFrameHost* render_frame_host,
    const std::string& interface_name,
    mojo::ScopedMessagePipeHandle* interface_pipe) {
  registry_.TryBindInterface(interface_name, interface_pipe);
  for (auto& observer : observers_) {
    observer.OnInterfaceRequestFromFrame(render_frame_host, interface_name,
                                         interface_pipe);
    if (!interface_pipe->is_valid())
      break;
  }
}

void WebContentsImpl::OnDidBlockNavigation(
    const GURL& blocked_url,
    const GURL& initiator_url,
    blink::NavigationBlockedReason reason) {
  if (delegate_)
    delegate_->OnDidBlockNavigation(this, blocked_url, initiator_url, reason);
}

const GURL& WebContentsImpl::GetMainFrameLastCommittedURL() {
  return GetLastCommittedURL();
}

void WebContentsImpl::RenderFrameCreated(RenderFrameHost* render_frame_host) {
  for (auto& observer : observers_)
    observer.RenderFrameCreated(render_frame_host);
  UpdateAccessibilityModeOnFrame(render_frame_host);

  if (display_cutout_host_impl_)
    display_cutout_host_impl_->RenderFrameCreated(render_frame_host);

  if (!render_frame_host->IsRenderFrameLive() || render_frame_host->GetParent())
    return;

  NavigationEntry* entry = controller_.GetPendingEntry();
  if (entry && entry->IsViewSourceMode()) {
    // Put the renderer in view source mode.
    render_frame_host->Send(
        new FrameMsg_EnableViewSourceMode(render_frame_host->GetRoutingID()));
  }
}

void WebContentsImpl::RenderFrameDeleted(RenderFrameHost* render_frame_host) {
  is_notifying_observers_ = true;
  for (auto& observer : observers_)
    observer.RenderFrameDeleted(render_frame_host);
  is_notifying_observers_ = false;
#if BUILDFLAG(ENABLE_PLUGINS)
  pepper_playback_observer_->RenderFrameDeleted(render_frame_host);
#endif

  if (display_cutout_host_impl_)
    display_cutout_host_impl_->RenderFrameDeleted(render_frame_host);

  // Remove any fullscreen state that the frame has stored.
  FullscreenStateChanged(render_frame_host, false /* is_fullscreen */);
}

void WebContentsImpl::ShowContextMenu(RenderFrameHost* render_frame_host,
                                      const ContextMenuParams& params) {
  // If a renderer fires off a second command to show a context menu before the
  // first context menu is closed, just ignore it. https://crbug.com/707534
  if (showing_context_menu_)
    return;

  ContextMenuParams context_menu_params(params);
  // Allow WebContentsDelegates to handle the context menu operation first.
  if (delegate_ &&
      delegate_->HandleContextMenu(render_frame_host, context_menu_params))
    return;

  render_view_host_delegate_view_->ShowContextMenu(render_frame_host,
                                                   context_menu_params);
}

namespace {
// Normalizes the line endings: \r\n -> \n, lone \r -> \n.
base::string16 NormalizeLineBreaks(const base::string16& source) {
  static const base::NoDestructor<base::string16> kReturnNewline(
      base::ASCIIToUTF16("\r\n"));
  static const base::NoDestructor<base::string16> kReturn(
      base::ASCIIToUTF16("\r"));
  static const base::NoDestructor<base::string16> kNewline(
      base::ASCIIToUTF16("\n"));

  std::vector<base::StringPiece16> pieces;

  for (const auto& rn_line : base::SplitStringPieceUsingSubstr(
           source, *kReturnNewline, base::KEEP_WHITESPACE,
           base::SPLIT_WANT_ALL)) {
    auto r_lines = base::SplitStringPieceUsingSubstr(
        rn_line, *kReturn, base::KEEP_WHITESPACE, base::SPLIT_WANT_ALL);
    std::move(std::begin(r_lines), std::end(r_lines),
              std::back_inserter(pieces));
  }

  return base::JoinString(pieces, *kNewline);
}
}  // namespace

void WebContentsImpl::RunJavaScriptDialog(RenderFrameHost* render_frame_host,
                                          const base::string16& message,
                                          const base::string16& default_prompt,
                                          JavaScriptDialogType dialog_type,
                                          IPC::Message* reply_msg) {
  // Ensure that if showing a dialog is the first thing that a page does, that
  // the contents of the previous page aren't shown behind it. This is required
  // because showing a dialog freezes the renderer, so no frames will be coming
  // from it. https://crbug.com/823353
  auto* render_widget_host_impl =
      static_cast<RenderFrameHostImpl*>(render_frame_host)
          ->GetRenderWidgetHost();
  if (render_widget_host_impl)
    render_widget_host_impl->ForceFirstFrameAfterNavigationTimeout();

  // Running a dialog causes an exit to webpage-initiated fullscreen.
  // http://crbug.com/728276
  ForSecurityDropFullscreen();

  auto callback =
      base::BindOnce(&WebContentsImpl::OnDialogClosed, base::Unretained(this),
                     render_frame_host->GetProcess()->GetID(),
                     render_frame_host->GetRoutingID(), reply_msg);

  std::vector<protocol::PageHandler*> page_handlers =
      protocol::PageHandler::EnabledForWebContents(this);

  if (delegate_)
    dialog_manager_ = delegate_->GetJavaScriptDialogManager(this);

  // While a JS message dialog is showing, defer commits in this WebContents.
  javascript_dialog_navigation_deferrer_ =
      std::make_unique<JavaScriptDialogNavigationDeferrer>();

  // Suppress JavaScript dialogs when requested. Also suppress messages when
  // showing an interstitial as it's shown over the previous page and we don't
  // want the hidden page's dialogs to interfere with the interstitial.
  bool should_suppress = ShowingInterstitialPage() ||
                         (delegate_ && delegate_->ShouldSuppressDialogs(this));
  bool has_non_devtools_handlers = delegate_ && dialog_manager_;
  bool has_handlers = page_handlers.size() || has_non_devtools_handlers;
  bool suppress_this_message = should_suppress || !has_handlers;

  if (suppress_this_message) {
    std::move(callback).Run(true, false, base::string16());
    return;
  }

  scoped_refptr<CloseDialogCallbackWrapper> wrapper =
      new CloseDialogCallbackWrapper(std::move(callback));

  is_showing_javascript_dialog_ = true;

  base::string16 normalized_message = NormalizeLineBreaks(message);

  for (auto* handler : page_handlers) {
    handler->DidRunJavaScriptDialog(
        render_frame_host->GetLastCommittedURL(), normalized_message,
        default_prompt, dialog_type, has_non_devtools_handlers,
        base::BindOnce(&CloseDialogCallbackWrapper::Run, wrapper, false));
  }

  if (dialog_manager_) {
    dialog_manager_->RunJavaScriptDialog(
        this, render_frame_host, dialog_type, normalized_message,
        default_prompt,
        base::BindOnce(&CloseDialogCallbackWrapper::Run, wrapper, false),
        &suppress_this_message);
  }

  if (suppress_this_message) {
    // If we are suppressing messages, just reply as if the user immediately
    // pressed "Cancel", passing true to |dialog_was_suppressed|.
    wrapper->Run(true, false, base::string16());
  }
}

void WebContentsImpl::RunBeforeUnloadConfirm(
    RenderFrameHost* render_frame_host,
    bool is_reload,
    IPC::Message* reply_msg) {
  // Ensure that if showing a dialog is the first thing that a page does, that
  // the contents of the previous page aren't shown behind it. This is required
  // because showing a dialog freezes the renderer, so no frames will be coming
  // from it. https://crbug.com/823353
  auto* render_widget_host_impl =
      static_cast<RenderFrameHostImpl*>(render_frame_host)
          ->GetRenderWidgetHost();
  if (render_widget_host_impl)
    render_widget_host_impl->ForceFirstFrameAfterNavigationTimeout();

  // Running a dialog causes an exit to webpage-initiated fullscreen.
  // http://crbug.com/728276
  ForSecurityDropFullscreen();

  RenderFrameHostImpl* rfhi =
      static_cast<RenderFrameHostImpl*>(render_frame_host);
  if (delegate_)
    delegate_->WillRunBeforeUnloadConfirm();

  auto callback =
      base::BindOnce(&WebContentsImpl::OnDialogClosed, base::Unretained(this),
                     render_frame_host->GetProcess()->GetID(),
                     render_frame_host->GetRoutingID(), reply_msg);

  std::vector<protocol::PageHandler*> page_handlers =
      protocol::PageHandler::EnabledForWebContents(this);

  if (delegate_)
    dialog_manager_ = delegate_->GetJavaScriptDialogManager(this);

  // While a JS beforeunload dialog is showing, defer commits in this
  // WebContents.
  javascript_dialog_navigation_deferrer_ =
      std::make_unique<JavaScriptDialogNavigationDeferrer>();

  bool should_suppress = ShowingInterstitialPage() || !rfhi->is_active() ||
                         (delegate_ && delegate_->ShouldSuppressDialogs(this));
  bool has_non_devtools_handlers = delegate_ && dialog_manager_;
  bool has_handlers = page_handlers.size() || has_non_devtools_handlers;
  if (should_suppress || !has_handlers) {
    std::move(callback).Run(false, true, base::string16());
    return;
  }

  is_showing_before_unload_dialog_ = true;

  scoped_refptr<CloseDialogCallbackWrapper> wrapper =
      new CloseDialogCallbackWrapper(std::move(callback));

  GURL frame_url = rfhi->GetLastCommittedURL();
  for (auto* handler : page_handlers) {
    handler->DidRunBeforeUnloadConfirm(
        frame_url, has_non_devtools_handlers,
        base::BindOnce(&CloseDialogCallbackWrapper::Run, wrapper, false));
  }

  if (dialog_manager_) {
    dialog_manager_->RunBeforeUnloadDialog(
        this, render_frame_host, is_reload,
        base::BindOnce(&CloseDialogCallbackWrapper::Run, wrapper, false));
  }
}

void WebContentsImpl::RunFileChooser(
    RenderFrameHost* render_frame_host,
    std::unique_ptr<content::FileSelectListener> listener,
    const blink::mojom::FileChooserParams& params) {
  // Any explicit focusing of another window while this WebContents is in
  // fullscreen can be used to confuse the user, so drop fullscreen.
  ForSecurityDropFullscreen();

  RenderFrameHostImpl* rfhi =
      static_cast<RenderFrameHostImpl*>(render_frame_host);
  if (devtools_instrumentation::InterceptFileChooser(rfhi, &listener, params))
    return;

  if (delegate_)
    delegate_->RunFileChooser(render_frame_host, std::move(listener), params);
  else
    listener->FileSelectionCanceled();
}

WebContents* WebContentsImpl::GetAsWebContents() {
  return this;
}

#if !defined(OS_ANDROID)
double WebContentsImpl::GetPendingPageZoomLevel() {
  NavigationEntry* pending_entry = GetController().GetPendingEntry();
  if (!pending_entry)
    return HostZoomMap::GetZoomLevel(this);

  GURL url = pending_entry->GetURL();
  return HostZoomMap::GetForWebContents(this)->GetZoomLevelForHostAndScheme(
      url.scheme(), net::GetHostOrSpecFromURL(url));
}
#endif  // !defined(OS_ANDROID)

bool WebContentsImpl::HideDownloadUI() const {
  return is_overlay_content_;
}

bool WebContentsImpl::HasPersistentVideo() const {
  return has_persistent_video_;
}

bool WebContentsImpl::IsSpatialNavigationDisabled() const {
  return is_spatial_navigation_disabled_;
}

RenderFrameHost* WebContentsImpl::GetPendingMainFrame() {
  return GetRenderManager()->speculative_frame_host();
}

bool WebContentsImpl::HasActiveEffectivelyFullscreenVideo() const {
  return media_web_contents_observer_->HasActiveEffectivelyFullscreenVideo();
}

bool WebContentsImpl::IsPictureInPictureAllowedForFullscreenVideo() const {
  return media_web_contents_observer_
      ->IsPictureInPictureAllowedForFullscreenVideo();
}

bool WebContentsImpl::IsFocusedElementEditable() {
  RenderFrameHostImpl* frame = GetFocusedFrame();
  return frame && frame->has_focused_editable_element();
}

bool WebContentsImpl::IsShowingContextMenu() {
  return showing_context_menu_;
}

void WebContentsImpl::SetShowingContextMenu(bool showing) {
  DCHECK_NE(showing_context_menu_, showing);
  showing_context_menu_ = showing;

  if (auto* view = GetRenderWidgetHostView()) {
    // Notify the main frame's RWHV to run the platform-specific code, if any.
    static_cast<RenderWidgetHostViewBase*>(view)->SetShowingContextMenu(
        showing);
  }
}

void WebContentsImpl::ClearFocusedElement() {
  if (auto* frame = GetFocusedFrame())
    frame->ClearFocusedElement();
}

bool WebContentsImpl::IsNeverVisible() {
  if (!delegate_)
    return false;
  return delegate_->IsNeverVisible(this);
}

RenderViewHostDelegateView* WebContentsImpl::GetDelegateView() {
  return render_view_host_delegate_view_;
}

blink::mojom::RendererPreferences WebContentsImpl::GetRendererPrefs(
    BrowserContext* browser_context) const {
  return renderer_preferences_;
}

void WebContentsImpl::RemoveBrowserPluginEmbedder() {
  browser_plugin_embedder_.reset();
}

RenderFrameHostImpl* WebContentsImpl::GetOuterWebContentsFrame() {
  if (GetOuterDelegateFrameTreeNodeId() ==
      FrameTreeNode::kFrameTreeNodeInvalidId) {
    return nullptr;
  }

  FrameTreeNode* outer_node =
      FrameTreeNode::GloballyFindByID(GetOuterDelegateFrameTreeNodeId());
  // The outer node should be in the outer WebContents.
  DCHECK_EQ(outer_node->frame_tree(), GetOuterWebContents()->GetFrameTree());
  return outer_node->parent()->current_frame_host();
}

WebContentsImpl* WebContentsImpl::GetOuterWebContents() {
  if (GuestMode::IsCrossProcessFrameGuest(this))
    return node_.outer_web_contents();

  if (browser_plugin_guest_)
    return browser_plugin_guest_->embedder_web_contents();

  return node_.outer_web_contents();
}

std::vector<WebContents*> WebContentsImpl::GetInnerWebContents() {
  std::vector<WebContents*> all_inner_contents;
  if (browser_plugin_embedder_) {
    BrowserPluginGuestManager* guest_manager =
        GetBrowserContext()->GetGuestManager();
    if (guest_manager) {
      guest_manager->ForEachGuest(
          this,
          base::BindRepeating(&GetInnerWebContentsHelper, &all_inner_contents));
    }
  }
  const auto& inner_contents = node_.GetInnerWebContents();
  all_inner_contents.insert(all_inner_contents.end(), inner_contents.begin(),
                            inner_contents.end());
  return all_inner_contents;
}

WebContentsImpl* WebContentsImpl::GetFocusedWebContents() {
  return GetOutermostWebContents()->node_.focused_web_contents();
}

bool WebContentsImpl::ContainsOrIsFocusedWebContents() {
  for (WebContentsImpl* focused_contents = GetFocusedWebContents();
       focused_contents;
       focused_contents = focused_contents->GetOuterWebContents()) {
    if (focused_contents == this)
      return true;
  }

  return false;
}

WebContentsImpl* WebContentsImpl::GetOutermostWebContents() {
  WebContentsImpl* root = this;
  while (root->GetOuterWebContents())
    root = root->GetOuterWebContents();
  return root;
}

void WebContentsImpl::FocusOuterAttachmentFrameChain() {
  WebContentsImpl* outer_contents = GetOuterWebContents();
  if (!outer_contents)
    return;

  FrameTreeNode* outer_node =
      FrameTreeNode::GloballyFindByID(GetOuterDelegateFrameTreeNodeId());
  outer_contents->frame_tree_.SetFocusedFrame(outer_node, nullptr);

  // For a browser initiated focus change, let embedding renderer know of the
  // change. Otherwise, if the currently focused element is just across a
  // process boundary in focus order, it will not be possible to move across
  // that boundary. This is because the target element will already be focused
  // (that renderer was not notified) and drop the event.
  if (GetRenderManager()->GetProxyToOuterDelegate())
    GetRenderManager()->GetProxyToOuterDelegate()->SetFocusedFrame();

  outer_contents->FocusOuterAttachmentFrameChain();
}

void WebContentsImpl::InnerWebContentsCreated(WebContents* inner_web_contents) {
  had_inner_webcontents_ = true;
  for (auto& observer : observers_)
    observer.InnerWebContentsCreated(inner_web_contents);
}

void WebContentsImpl::RenderViewCreated(RenderViewHost* render_view_host) {
  if (delegate_)
    view_->SetOverscrollControllerEnabled(CanOverscrollContent());

  NotificationService::current()->Notify(
      NOTIFICATION_WEB_CONTENTS_RENDER_VIEW_HOST_CREATED,
      Source<WebContents>(this),
      Details<RenderViewHost>(render_view_host));

  view_->RenderViewCreated(render_view_host);

  for (auto& observer : observers_)
    observer.RenderViewCreated(render_view_host);
  if (delegate_)
    RenderFrameDevToolsAgentHost::WebContentsCreated(this);
}

void WebContentsImpl::RenderViewReady(RenderViewHost* rvh) {
  if (rvh != GetRenderViewHost()) {
    // Don't notify the world, since this came from a renderer in the
    // background.
    return;
  }

  RenderWidgetHostViewBase* rwhv =
      static_cast<RenderWidgetHostViewBase*>(GetRenderWidgetHostView());
  if (rwhv)
    rwhv->SetMainFrameAXTreeID(GetMainFrame()->GetAXTreeID());

  notify_disconnection_ = true;

  bool was_crashed = IsCrashed();
  SetIsCrashed(base::TERMINATION_STATUS_STILL_RUNNING, 0);

  // Restore the focus to the tab (otherwise the focus will be on the top
  // window).
  if (was_crashed && !FocusLocationBarByDefault() &&
      (!delegate_ || delegate_->ShouldFocusPageAfterCrash())) {
    view_->Focus();
  }

  for (auto& observer : observers_)
    observer.RenderViewReady();

  view_->RenderViewReady();
}

void WebContentsImpl::RenderViewTerminated(RenderViewHost* rvh,
                                           base::TerminationStatus status,
                                           int error_code) {
  if (rvh != GetRenderViewHost()) {
    // The pending page's RenderViewHost is gone.
    return;
  }

  // Ensure fullscreen mode is exited in the |delegate_| since a crashed
  // renderer may not have made a clean exit.
  if (IsFullscreenForCurrentTab())
    ExitFullscreenMode(false);

  // Ensure any video in Picture-in-Picture is exited in the |delegate_| since
  // a crashed renderer may not have made a clean exit.
  if (HasPictureInPictureVideo())
    ExitPictureInPicture();

  // Cancel any visible dialogs so they are not left dangling over the sad tab.
  CancelActiveAndPendingDialogs();

  audio_stream_monitor_.RenderProcessGone(rvh->GetProcess()->GetID());

  // Reset the loading progress. TODO(avi): What does it mean to have a
  // "renderer crash" when there is more than one renderer process serving a
  // webpage? Once this function is called at a more granular frame level, we
  // probably will need to more granularly reset the state here.
  ResetLoadProgressState();
  NotifyDisconnected();
  SetIsCrashed(status, error_code);

  for (auto& observer : observers_)
    observer.RenderProcessGone(GetCrashedStatus());
}

void WebContentsImpl::RenderViewDeleted(RenderViewHost* rvh) {
  for (auto& observer : observers_)
    observer.RenderViewDeleted(rvh);
}

void WebContentsImpl::UpdateTargetURL(RenderViewHost* render_view_host,
                                      const GURL& url) {
  if (fullscreen_widget_routing_id_ != MSG_ROUTING_NONE) {
    // If we're in flash fullscreen (i.e. Pepper plugin fullscreen) only update
    // the url if it's from the fullscreen renderer.
    RenderWidgetHostView* fs = GetFullscreenRenderWidgetHostView();
    if (fs && fs->GetRenderWidgetHost() != render_view_host->GetWidget())
      return;
  }

  // In case of racey updates from multiple RenderViewHosts, the last URL should
  // be shown - see also some discussion in https://crbug.com/807776.
  if (!url.is_valid() && render_view_host != view_that_set_last_target_url_)
    return;
  view_that_set_last_target_url_ = url.is_valid() ? render_view_host : nullptr;

  if (delegate_)
    delegate_->UpdateTargetURL(this, url);
}

void WebContentsImpl::ClearTargetURL() {
  view_that_set_last_target_url_ = nullptr;
  if (delegate_)
    delegate_->UpdateTargetURL(this, GURL());
}

void WebContentsImpl::Close(RenderViewHost* rvh) {
#if defined(OS_MACOSX)
  // The UI may be in an event-tracking loop, such as between the
  // mouse-down and mouse-up in text selection or a button click.
  // Defer the close until after tracking is complete, so that we
  // don't free objects out from under the UI.
  // TODO(shess): This could get more fine-grained.  For instance,
  // closing a tab in another window while selecting text in the
  // current window's Omnibox should be just fine.
  if (view_->CloseTabAfterEventTrackingIfNeeded())
    return;
#endif

  // Ignore this if it comes from a RenderViewHost that we aren't showing.
  if (delegate_ && rvh == GetRenderViewHost())
    delegate_->CloseContents(this);
}

void WebContentsImpl::RequestSetBounds(const gfx::Rect& new_bounds) {
  if (delegate_)
    delegate_->SetContentsBounds(this, new_bounds);
}

void WebContentsImpl::DidStartLoading(FrameTreeNode* frame_tree_node,
                                      bool to_different_document) {
  LoadingStateChanged(frame_tree_node->IsMainFrame() && to_different_document,
                      false, nullptr);

  // Reset the focus state from DidStartNavigation to false if a new load starts
  // afterward, in case loading logic triggers a FocusLocationBarByDefault call.
  should_focus_location_bar_by_default_ = false;

  // Notify accessibility that the user is navigating away from the
  // current document.
  // TODO(domfarolino, dmazzoni): Do this using WebContentsObserver. See
  // https://crbug.com/981271.
  BrowserAccessibilityManager* manager =
      frame_tree_node->current_frame_host()->browser_accessibility_manager();
  if (manager)
    manager->UserIsNavigatingAway();
}

void WebContentsImpl::DidStopLoading() {
  std::unique_ptr<LoadNotificationDetails> details;

  // Use the last committed entry rather than the active one, in case a
  // pending entry has been created.
  NavigationEntry* entry = controller_.GetLastCommittedEntry();
  Navigator* navigator = frame_tree_.root()->navigator();

  // An entry may not exist for a stop when loading an initial blank page or
  // if an iframe injected by script into a blank page finishes loading.
  if (entry) {
    base::TimeDelta elapsed =
        base::TimeTicks::Now() - navigator->GetCurrentLoadStart();

    details.reset(new LoadNotificationDetails(
        entry->GetVirtualURL(),
        elapsed,
        &controller_,
        controller_.GetCurrentEntryIndex()));
  }

  LoadingStateChanged(true, false, details.get());
}

void WebContentsImpl::DidChangeLoadProgress() {
  if (is_being_destroyed_)
    return;
  double load_progress = frame_tree_.load_progress();

  // The delegate is notified immediately for the first and last updates. Also,
  // since the message loop may be pretty busy when a page is loaded, it might
  // not execute a posted task in a timely manner so the progress report is sent
  // immediately if enough time has passed.
  base::TimeDelta min_delay =
      base::TimeDelta::FromMilliseconds(kMinimumDelayBetweenLoadingUpdatesMS);
  bool delay_elapsed = loading_last_progress_update_.is_null() ||
      base::TimeTicks::Now() - loading_last_progress_update_ > min_delay;

  if (load_progress == 0.0 || load_progress == 1.0 || delay_elapsed) {
    // If there is a pending task to send progress, it is now obsolete.
    loading_weak_factory_.InvalidateWeakPtrs();

    // Notify the load progress change.
    SendChangeLoadProgress();

    // Clean-up the states if needed.
    if (load_progress == 1.0)
      ResetLoadProgressState();
    return;
  }

  if (loading_weak_factory_.HasWeakPtrs())
    return;

  base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
      FROM_HERE,
      base::BindOnce(&WebContentsImpl::SendChangeLoadProgress,
                     loading_weak_factory_.GetWeakPtr()),
      min_delay);
}

std::vector<std::unique_ptr<NavigationThrottle>>
WebContentsImpl::CreateThrottlesForNavigation(
    NavigationHandle* navigation_handle) {
  auto throttles = GetContentClient()->browser()->CreateThrottlesForNavigation(
      navigation_handle);

  // This is not a normal place to be adding a throttle. However, in the case
  // javascript dialogs, related logic is present in the web_contents/ layer,
  // and the purpose of the throttle is to ensure that navigation commits are
  // deferred for the entire WebContents. Most throttles are either added by
  // the embederrer outside of content/, or are per-frame and added by
  // NavigationThrottleRunner.
  std::unique_ptr<content::NavigationThrottle> dialog_throttle =
      JavaScriptDialogNavigationThrottle::MaybeCreateThrottleFor(
          navigation_handle);
  if (dialog_throttle)
    throttles.push_back(std::move(dialog_throttle));

  return throttles;
}

std::unique_ptr<NavigationUIData> WebContentsImpl::GetNavigationUIData(
    NavigationHandle* navigation_handle) {
  return GetContentClient()->browser()->GetNavigationUIData(navigation_handle);
}

void WebContentsImpl::DidCancelLoading() {
  controller_.DiscardNonCommittedEntries();

  // Update the URL display.
  NotifyNavigationStateChanged(INVALIDATE_TYPE_URL);
}

void WebContentsImpl::DidAccessInitialDocument() {
  has_accessed_initial_document_ = true;

  // We may have left a failed browser-initiated navigation in the address bar
  // to let the user edit it and try again.  Clear it now that content might
  // show up underneath it.
  if (!IsLoading() && controller_.GetPendingEntry())
    controller_.DiscardPendingEntry(false);

  // Update the URL display.
  NotifyNavigationStateChanged(INVALIDATE_TYPE_URL);
}

void WebContentsImpl::DidChangeName(RenderFrameHost* render_frame_host,
                                    const std::string& name) {
  for (auto& observer : observers_)
    observer.FrameNameChanged(render_frame_host, name);
}

void WebContentsImpl::DidReceiveFirstUserActivation(
    RenderFrameHost* render_frame_host) {
  for (auto& observer : observers_)
    observer.FrameReceivedFirstUserActivation(render_frame_host);
}

void WebContentsImpl::DidChangeDisplayState(RenderFrameHost* render_frame_host,
                                            bool is_display_none) {
  for (auto& observer : observers_)
    observer.FrameDisplayStateChanged(render_frame_host, is_display_none);
}

void WebContentsImpl::FrameSizeChanged(RenderFrameHost* render_frame_host,
                                       const gfx::Size& frame_size) {
  for (auto& observer : observers_)
    observer.FrameSizeChanged(render_frame_host, frame_size);
}

void WebContentsImpl::DocumentOnLoadCompleted(
    RenderFrameHost* render_frame_host) {
  ShowInsecureLocalhostWarningIfNeeded();

  is_notifying_observers_ = true;
  for (auto& observer : observers_)
    observer.DocumentOnLoadCompletedInMainFrame();
  is_notifying_observers_ = false;

  // TODO(avi): Remove. http://crbug.com/170921
  NotificationService::current()->Notify(
      NOTIFICATION_LOAD_COMPLETED_MAIN_FRAME,
      Source<WebContents>(this),
      NotificationService::NoDetails());
}

void WebContentsImpl::UpdateStateForFrame(RenderFrameHost* render_frame_host,
                                          const PageState& page_state) {
  // The state update affects the last NavigationEntry associated with the given
  // |render_frame_host|. This may not be the last committed NavigationEntry (as
  // in the case of an UpdateState from a frame being swapped out). We track
  // which entry this is in the RenderFrameHost's nav_entry_id.
  RenderFrameHostImpl* rfhi =
      static_cast<RenderFrameHostImpl*>(render_frame_host);
  NavigationEntryImpl* entry =
      controller_.GetEntryWithUniqueID(rfhi->nav_entry_id());
  if (!entry)
    return;

  FrameNavigationEntry* frame_entry =
      entry->GetFrameEntry(rfhi->frame_tree_node());
  if (!frame_entry)
    return;

  // The SiteInstance might not match if we do a cross-process navigation with
  // replacement (e.g., auto-subframe), in which case the swap out of the old
  // RenderFrameHost runs in the background after the old FrameNavigationEntry
  // has already been replaced and destroyed.
  if (frame_entry->site_instance() != rfhi->GetSiteInstance())
    return;

  if (page_state == frame_entry->page_state())
    return;  // Nothing to update.

  DCHECK(page_state.IsValid()) << "Shouldn't set an empty PageState.";

  // The document_sequence_number and item_sequence_number recorded in the
  // FrameNavigationEntry should not differ from the one coming with the update,
  // since it must come from the same document. Do not update it if a difference
  // is detected, as this indicates that |frame_entry| is not the correct one.
  ExplodedPageState exploded_state;
  if (!DecodePageState(page_state.ToEncodedData(), &exploded_state))
    return;

  if (exploded_state.top.document_sequence_number !=
          frame_entry->document_sequence_number() ||
      exploded_state.top.item_sequence_number !=
          frame_entry->item_sequence_number()) {
    return;
  }

  frame_entry->SetPageState(page_state);
  controller_.NotifyEntryChanged(entry);
}

void WebContentsImpl::UpdateTitle(RenderFrameHost* render_frame_host,
                                  const base::string16& title,
                                  base::i18n::TextDirection title_direction) {
  // Try to find the navigation entry, which might not be the current one.
  // For example, it might be from a recently swapped out RFH.
  NavigationEntryImpl* entry = controller_.GetEntryWithUniqueID(
      static_cast<RenderFrameHostImpl*>(render_frame_host)->nav_entry_id());

  // We can handle title updates when we don't have an entry in
  // UpdateTitleForEntry, but only if the update is from the current RVH.
  // TODO(avi): Change to make decisions based on the RenderFrameHost.
  if (!entry && render_frame_host != GetMainFrame())
    return;

  // TODO(evan): make use of title_direction.
  // http://code.google.com/p/chromium/issues/detail?id=27094
  UpdateTitleForEntry(entry, title);
}

void WebContentsImpl::UpdateEncoding(RenderFrameHost* render_frame_host,
                                     const std::string& encoding) {
  SetEncoding(encoding);
}

void WebContentsImpl::DocumentAvailableInMainFrame(
    RenderViewHost* render_view_host) {
  for (auto& observer : observers_)
    observer.DocumentAvailableInMainFrame();
}

void WebContentsImpl::RouteCloseEvent(RenderViewHost* rvh) {
  // Tell the active RenderViewHost to run unload handlers and close, as long
  // as the request came from a RenderViewHost in the same BrowsingInstance.
  // In most cases, we receive this from a swapped out RenderViewHost.
  // It is possible to receive it from one that has just been swapped in,
  // in which case we might as well deliver the message anyway.
  if (rvh->GetSiteInstance()->IsRelatedSiteInstance(GetSiteInstance()))
    ClosePage();
}

bool WebContentsImpl::ShouldRouteMessageEvent(
    RenderFrameHost* target_rfh,
    SiteInstance* source_site_instance) const {
  // Allow the message if this WebContents is dedicated to a browser plugin
  // guest.
  // Note: This check means that an embedder could theoretically receive a
  // postMessage from anyone (not just its own guests). However, this is
  // probably not a risk for apps since other pages won't have references
  // to App windows.
  return GetBrowserPluginGuest() || GetBrowserPluginEmbedder();
}

void WebContentsImpl::EnsureOpenerProxiesExist(RenderFrameHost* source_rfh) {
  WebContentsImpl* source_web_contents = static_cast<WebContentsImpl*>(
      WebContents::FromRenderFrameHost(source_rfh));

  if (source_web_contents) {
    // If this message is going to outer WebContents from inner WebContents,
    // then we should not create a RenderView. AttachToOuterWebContentsFrame()
    // already created a RenderFrameProxyHost for that purpose.
    if (GetBrowserPluginEmbedder() &&
        GuestMode::IsCrossProcessFrameGuest(source_web_contents)) {
      return;
    }

    if (this != source_web_contents && GetBrowserPluginGuest()) {
      // We create a RenderFrameProxyHost for the embedder in the guest's render
      // process but we intentionally do not expose the embedder's opener chain
      // to it.
      source_web_contents->GetRenderManager()->CreateRenderFrameProxy(
          GetSiteInstance());
    } else {
      RenderFrameHostImpl* source_rfhi =
          static_cast<RenderFrameHostImpl*>(source_rfh);
      source_rfhi->frame_tree_node()->render_manager()->CreateOpenerProxies(
          GetSiteInstance(), nullptr);
    }
  }
}

void WebContentsImpl::ForSecurityDropFullscreen() {
  // There are two chains of WebContents to kick out of fullscreen.
  //
  // Chain 1, the inner/outer WebContents chain. If an inner WebContents has
  // done something that requires the browser to drop fullscreen, drop
  // fullscreen from it and any outer WebContents that may be in fullscreen.
  //
  // Chain 2, the opener WebContents chain. If a WebContents has done something
  // that requires the browser to drop fullscreen, drop fullscreen from any
  // WebContents that was involved in the chain of opening it.
  //
  // Note that these two chains don't interact, as only a top-level WebContents
  // can have an opener. This simplifies things.

  WebContents* web_contents = this;
  while (web_contents) {
    if (web_contents->IsFullscreenForCurrentTab())
      web_contents->ExitFullscreen(true);

    if (web_contents->HasOriginalOpener())
      web_contents = FromRenderFrameHost(web_contents->GetOriginalOpener());
    else
      web_contents = web_contents->GetOuterWebContents();
  }
}

void WebContentsImpl::SetAsFocusedWebContentsIfNecessary() {
  // Only change focus if we are not currently focused.
  WebContentsImpl* old_contents = GetFocusedWebContents();
  if (old_contents == this)
    return;

  GetOutermostWebContents()->node_.SetFocusedWebContents(this);

  if (!GuestMode::IsCrossProcessFrameGuest(this) && browser_plugin_guest_)
    return;

  // Send a page level blur to the old contents so that it displays inactive UI
  // and focus this contents to activate it.
  if (old_contents)
    old_contents->GetMainFrame()->GetRenderWidgetHost()->SetPageFocus(false);

  // Make sure the outer web contents knows our frame is focused. Otherwise, the
  // outer renderer could have the element before or after the frame element
  // focused which would return early without actually advancing focus.
  FocusOuterAttachmentFrameChain();

  if (ShowingInterstitialPage()) {
    static_cast<RenderFrameHostImpl*>(interstitial_page_->GetMainFrame())
        ->GetRenderWidgetHost()
        ->SetPageFocus(true);
  } else {
    GetMainFrame()->GetRenderWidgetHost()->SetPageFocus(true);
  }
}

void WebContentsImpl::SetFocusedFrame(FrameTreeNode* node,
                                      SiteInstance* source) {
  frame_tree_.SetFocusedFrame(node, source);

  if (auto* inner_contents = node_.GetInnerWebContentsInFrame(node)) {
    // |this| is an outer WebContents and |node| represents an inner
    // WebContents. Transfer the focus to the inner contents if |this| is
    // focused.
    if (GetFocusedWebContents() == this)
      inner_contents->SetAsFocusedWebContentsIfNecessary();
  } else if (node_.OuterContentsFrameTreeNode() &&
             node_.OuterContentsFrameTreeNode()
                     ->current_frame_host()
                     ->GetSiteInstance() == source) {
    // |this| is an inner WebContents, |node| is its main FrameTreeNode and
    // the outer WebContents FrameTreeNode is at |source|'s SiteInstance.
    // Transfer the focus to the inner WebContents if the outer WebContents is
    // focused. This branch is used when an inner WebContents is focused through
    // its RenderFrameProxyHost (via FrameHostMsg_FrameFocused IPC, used to
    // implement the window.focus() API).
    if (GetFocusedWebContents() == GetOuterWebContents())
      SetAsFocusedWebContentsIfNecessary();
  } else if (!GetOuterWebContents()) {
    // This is an outermost WebContents.
    SetAsFocusedWebContentsIfNecessary();
  } else if (!GuestMode::IsCrossProcessFrameGuest(this) &&
             GetOuterWebContents()) {
    // TODO(lfg, paulmeyer): Allows BrowserPlugins to set themselves as the
    // focused WebContents. This works around a bug in FindRequestManager that
    // doesn't support properly traversing BrowserPlugins.
    SetAsFocusedWebContentsIfNecessary();
  }
}

void WebContentsImpl::DidCallFocus() {
  // Any explicit focusing of another window while this WebContents is in
  // fullscreen can be used to confuse the user, so drop fullscreen.
  ForSecurityDropFullscreen();
}

RenderFrameHost* WebContentsImpl::GetFocusedFrameIncludingInnerWebContents() {
  WebContentsImpl* contents = this;
  FrameTreeNode* focused_node = contents->frame_tree_.GetFocusedFrame();

  // If there is no focused frame in the outer WebContents, we need to return
  // null.
  if (!focused_node)
    return nullptr;

  // If the focused frame is embedding an inner WebContents, we must descend
  // into that contents. If the current WebContents does not have a focused
  // frame, return the main frame of this contents instead of the focused empty
  // frame embedding this contents.
  while (true) {
    contents = contents->node_.GetInnerWebContentsInFrame(focused_node);
    if (!contents)
      return focused_node->current_frame_host();

    focused_node = contents->frame_tree_.GetFocusedFrame();
    if (!focused_node)
      return contents->GetMainFrame();
  }
}

void WebContentsImpl::OnAdvanceFocus(RenderFrameHostImpl* source_rfh) {
  // When a RenderFrame needs to advance focus to a RenderFrameProxy (by hitting
  // TAB), the RenderFrameProxy sends an IPC to RenderFrameProxyHost. When this
  // RenderFrameProxyHost represents an inner WebContents, the outer WebContents
  // needs to focus the inner WebContents.
  if (GetOuterWebContents() &&
      GetOuterWebContents() == source_rfh->delegate()->GetAsWebContents() &&
      GetFocusedWebContents() == GetOuterWebContents()) {
    SetAsFocusedWebContentsIfNecessary();
  }
}

void WebContentsImpl::OnFocusedElementChangedInFrame(
    RenderFrameHostImpl* frame,
    const gfx::Rect& bounds_in_root_view) {
  RenderWidgetHostViewBase* root_view =
      static_cast<RenderWidgetHostViewBase*>(GetRenderWidgetHostView());
  if (!root_view || !frame->GetView())
    return;

  // Converting to screen coordinates.
  gfx::Point origin = bounds_in_root_view.origin();
  origin += root_view->GetViewBounds().OffsetFromOrigin();
  gfx::Rect bounds_in_screen(origin, bounds_in_root_view.size());

  root_view->FocusedNodeChanged(frame->has_focused_editable_element(),
                                bounds_in_screen);

  FocusedNodeDetails details = {frame->has_focused_editable_element(),
                                bounds_in_screen};

  // TODO(ekaramad): We should replace this with an observer notification
  // (https://crbug.com/675975).
  NotificationService::current()->Notify(
      NOTIFICATION_FOCUS_CHANGED_IN_PAGE,
      Source<RenderViewHost>(GetRenderViewHost()),
      Details<FocusedNodeDetails>(&details));
}

bool WebContentsImpl::DidAddMessageToConsole(
    blink::mojom::ConsoleMessageLevel log_level,
    const base::string16& message,
    int32_t line_no,
    const base::string16& source_id) {
  if (!delegate_)
    return false;
  return delegate_->DidAddMessageToConsole(this, log_level, message, line_no,
                                           source_id);
}

void WebContentsImpl::DidReceiveInputEvent(
    RenderWidgetHostImpl* render_widget_host,
    const blink::WebInputEvent::Type type) {
  if (!IsUserInteractionInputType(type))
    return;

  // Ignore unless the widget is currently in the frame tree.
  if (!HasMatchingWidgetHost(&frame_tree_, render_widget_host))
    return;

  if (type != blink::WebInputEvent::kGestureScrollBegin)
    last_interactive_input_event_time_ = ui::EventTimeForNow();

  for (auto& observer : observers_)
    observer.DidGetUserInteraction(type);

  if (IsResourceLoadUserInteractionInputType(type))
    SendUserGestureForResourceDispatchHost();
}

bool WebContentsImpl::ShouldIgnoreInputEvents() {
  WebContentsImpl* web_contents = this;
  while (web_contents) {
    if (web_contents->ignore_input_events_)
      return true;
    web_contents = web_contents->GetOuterWebContents();
  }

  return false;
}

void WebContentsImpl::FocusOwningWebContents(
    RenderWidgetHostImpl* render_widget_host) {
  // The PDF plugin still runs as a BrowserPlugin and must go through the
  // input redirection mechanism. It must not become focused direcly.
  if (!GuestMode::IsCrossProcessFrameGuest(this) && browser_plugin_guest_)
    return;

  RenderWidgetHostImpl* focused_widget =
      GetFocusedRenderWidgetHost(render_widget_host);

  if (focused_widget != render_widget_host &&
      (!focused_widget ||
       focused_widget->delegate() != render_widget_host->delegate())) {
    SetAsFocusedWebContentsIfNecessary();
  }
}

void WebContentsImpl::OnIgnoredUIEvent() {
  // Notify observers.
  for (auto& observer : observers_)
    observer.DidGetIgnoredUIEvent();
}

void WebContentsImpl::RendererUnresponsive(
    RenderWidgetHostImpl* render_widget_host,
    base::RepeatingClosure hang_monitor_restarter) {
  if (ShouldIgnoreUnresponsiveRenderer())
    return;

  // Do not report hangs (to task manager, to hang renderer dialog, etc.) for
  // invisible tabs (like extension background page, background tabs).  See
  // https://crbug.com/881812 for rationale and for choosing the visibility
  // (rather than process priority) as the signal here.
  if (GetVisibility() != Visibility::VISIBLE)
    return;

  if (!render_widget_host->renderer_initialized())
    return;

  for (auto& observer : observers_)
    observer.OnRendererUnresponsive(render_widget_host->GetProcess());

  if (delegate_)
    delegate_->RendererUnresponsive(this, render_widget_host,
                                    std::move(hang_monitor_restarter));
}

void WebContentsImpl::RendererResponsive(
    RenderWidgetHostImpl* render_widget_host) {
  if (delegate_)
    delegate_->RendererResponsive(this, render_widget_host);
}

void WebContentsImpl::SubframeCrashed(
    blink::mojom::FrameVisibility visibility) {
  // If a subframe crashed on a hidden tab, mark the tab for reload to avoid
  // showing a sad frame to the user if they ever switch back to that tab. Do
  // this for subframes that are either visible in viewport or visible but
  // scrolled out of view, but skip subframes that are not rendered (e.g., via
  // "display:none"), since in that case the user wouldn't see a sad frame
  // anyway.
  bool did_mark_for_reload = false;
  if (IsHidden() && visibility != blink::mojom::FrameVisibility::kNotRendered &&
      base::FeatureList::IsEnabled(
          features::kReloadHiddenTabsWithCrashedSubframes)) {
    controller_.SetNeedsReload(
        NavigationControllerImpl::NeedsReloadType::kCrashedSubframe);
    did_mark_for_reload = true;
    UMA_HISTOGRAM_ENUMERATION(
        "Stability.ChildFrameCrash.TabMarkedForReload.Visibility", visibility);
  }

  UMA_HISTOGRAM_BOOLEAN("Stability.ChildFrameCrash.TabMarkedForReload",
                        did_mark_for_reload);
}

void WebContentsImpl::BeforeUnloadFiredFromRenderManager(
    bool proceed, const base::TimeTicks& proceed_time,
    bool* proceed_to_fire_unload) {
  for (auto& observer : observers_)
    observer.BeforeUnloadFired(proceed, proceed_time);
  if (delegate_)
    delegate_->BeforeUnloadFired(this, proceed, proceed_to_fire_unload);
  // Note: |this| might be deleted at this point.
}

void WebContentsImpl::RenderProcessGoneFromRenderManager(
    RenderViewHost* render_view_host) {
  DCHECK(crashed_status_ != base::TERMINATION_STATUS_STILL_RUNNING);
  RenderViewTerminated(render_view_host, crashed_status_, crashed_error_code_);
}

void WebContentsImpl::UpdateRenderViewSizeForRenderManager(bool is_main_frame) {
  // TODO(brettw) this is a hack. See WebContentsView::SizeContents.
  gfx::Size size = GetSizeForNewRenderView(is_main_frame);
  // 0x0 isn't a valid window size (minimal window size is 1x1) but it may be
  // here during container initialization and normal window size will be set
  // later. In case of tab duplication this resizing to 0x0 prevents setting
  // normal size later so just ignore it.
  if (!size.IsEmpty())
    view_->SizeContents(size);
}

void WebContentsImpl::CancelModalDialogsForRenderManager() {
  // We need to cancel modal dialogs when doing a process swap, since the load
  // deferrer would prevent us from swapping out. We also clear the state
  // because this is a cross-process navigation, which means that it's a new
  // site that should not have to pay for the sins of its predecessor.
  //
  // Note that we don't bother telling |browser_plugin_embedder_| because the
  // cross-process navigation will either destroy the browser plugins or not
  // require their dialogs to close.
  if (dialog_manager_) {
    dialog_manager_->CancelDialogs(this, /*reset_state=*/true);
  }
}

void WebContentsImpl::NotifySwappedFromRenderManager(RenderFrameHost* old_host,
                                                     RenderFrameHost* new_host,
                                                     bool is_main_frame) {
  if (is_main_frame) {
    NotifyViewSwapped(old_host ? old_host->GetRenderViewHost() : nullptr,
                      new_host->GetRenderViewHost());

    // Make sure the visible RVH reflects the new delegate's preferences.
    if (delegate_)
      view_->SetOverscrollControllerEnabled(CanOverscrollContent());

    RenderWidgetHostViewBase* rwhv =
        static_cast<RenderWidgetHostViewBase*>(GetRenderWidgetHostView());
    if (rwhv)
      rwhv->SetMainFrameAXTreeID(GetMainFrame()->GetAXTreeID());
  }

  NotifyFrameSwapped(old_host, new_host, is_main_frame);
}

void WebContentsImpl::NotifyMainFrameSwappedFromRenderManager(
    RenderFrameHost* old_host,
    RenderFrameHost* new_host) {
  NotifyViewSwapped(old_host ? old_host->GetRenderViewHost() : nullptr,
                    new_host->GetRenderViewHost());
}

NavigationControllerImpl& WebContentsImpl::GetControllerForRenderManager() {
  return GetController();
}

std::unique_ptr<WebUIImpl> WebContentsImpl::CreateWebUIForRenderFrameHost(
    const GURL& url) {
  return CreateWebUI(url);
}

NavigationEntry*
    WebContentsImpl::GetLastCommittedNavigationEntryForRenderManager() {
  return controller_.GetLastCommittedEntry();
}

InterstitialPageImpl* WebContentsImpl::GetInterstitialForRenderManager() {
  return interstitial_page_;
}

void WebContentsImpl::CreateRenderWidgetHostViewForRenderManager(
    RenderViewHost* render_view_host) {
  RenderWidgetHostViewBase* rwh_view =
      view_->CreateViewForWidget(render_view_host->GetWidget(), false);

  // Now that the RenderView has been created, we need to tell it its size.
  if (rwh_view)
    rwh_view->SetSize(GetSizeForNewRenderView(true));
}

bool WebContentsImpl::CreateRenderViewForRenderManager(
    RenderViewHost* render_view_host,
    int opener_frame_routing_id,
    int proxy_routing_id,
    const base::UnguessableToken& devtools_frame_token,
    const FrameReplicationState& replicated_frame_state) {
  TRACE_EVENT0("browser,navigation",
               "WebContentsImpl::CreateRenderViewForRenderManager");

  if (proxy_routing_id == MSG_ROUTING_NONE)
    CreateRenderWidgetHostViewForRenderManager(render_view_host);

  if (!static_cast<RenderViewHostImpl*>(render_view_host)
           ->CreateRenderView(opener_frame_routing_id, proxy_routing_id,
                              devtools_frame_token, replicated_frame_state,
                              created_with_opener_)) {
    return false;
  }
  // Set the TextAutosizer state from the main frame's renderer on the new view,
  // but only if it's not for the main frame. Main frame renderers should create
  // this state themselves from up-to-date values, so we shouldn't override it
  // with the cached values.
  if (!render_view_host->GetMainFrame()) {
    render_view_host->Send(
        new PageMsg_UpdateTextAutosizerPageInfoForRemoteMainFrames(
            render_view_host->GetRoutingID(), text_autosizer_page_info_));
  }

  if (proxy_routing_id == MSG_ROUTING_NONE && node_.outer_web_contents())
    ReattachToOuterWebContentsFrame();

  SetHistoryOffsetAndLengthForView(render_view_host,
                                   controller_.GetLastCommittedEntryIndex(),
                                   controller_.GetEntryCount());

#if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
  // Force a ViewMsg_Resize to be sent, needed to make plugins show up on
  // linux. See crbug.com/83941.
  RenderWidgetHostView* rwh_view = render_view_host->GetWidget()->GetView();
  if (rwh_view) {
    if (RenderWidgetHost* render_widget_host = rwh_view->GetRenderWidgetHost())
      render_widget_host->SynchronizeVisualProperties();
  }
#endif

  return true;
}

bool WebContentsImpl::CreateRenderFrameForRenderManager(
    RenderFrameHost* render_frame_host,
    int previous_routing_id,
    int opener_routing_id,
    int parent_routing_id,
    int previous_sibling_routing_id) {
  TRACE_EVENT0("browser,navigation",
               "WebContentsImpl::CreateRenderFrameForRenderManager");

  RenderFrameHostImpl* rfh =
      static_cast<RenderFrameHostImpl*>(render_frame_host);
  if (!rfh->CreateRenderFrame(previous_routing_id, opener_routing_id,
                              parent_routing_id, previous_sibling_routing_id))
    return false;

  // TODO(nasko): When RenderWidgetHost is owned by RenderFrameHost, the passed
  // RenderFrameHost will have to be associated with the appropriate
  // RenderWidgetHostView or a new one should be created here.

  return true;
}

#if defined(OS_ANDROID)

base::android::ScopedJavaLocalRef<jobject>
WebContentsImpl::GetJavaWebContents() {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);
  return GetWebContentsAndroid()->GetJavaObject();
}

WebContentsAndroid* WebContentsImpl::GetWebContentsAndroid() {
  if (!web_contents_android_) {
    web_contents_android_ = std::make_unique<WebContentsAndroid>(this);
  }
  return web_contents_android_.get();
}

void WebContentsImpl::ClearWebContentsAndroid() {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);
  web_contents_android_.reset();
}

void WebContentsImpl::ActivateNearestFindResult(float x,
                                                float y) {
  GetOrCreateFindRequestManager()->ActivateNearestFindResult(x, y);
}

void WebContentsImpl::RequestFindMatchRects(int current_version) {
  GetOrCreateFindRequestManager()->RequestFindMatchRects(current_version);
}

bool WebContentsImpl::CreateRenderViewForInitialEmptyDocument() {
  return CreateRenderViewForRenderManager(
      GetRenderViewHost(), MSG_ROUTING_NONE, MSG_ROUTING_NONE,
      frame_tree_.root()->devtools_frame_token(),
      frame_tree_.root()->current_replication_state());
}

service_manager::InterfaceProvider* WebContentsImpl::GetJavaInterfaces() {
  if (!java_interfaces_) {
    service_manager::mojom::InterfaceProviderPtr provider;
    BindInterfaceRegistryForWebContents(mojo::MakeRequest(&provider), this);
    java_interfaces_.reset(new service_manager::InterfaceProvider);
    java_interfaces_->Bind(std::move(provider));
  }
  return java_interfaces_.get();
}

#endif

bool WebContentsImpl::CompletedFirstVisuallyNonEmptyPaint() {
  return did_first_visually_non_empty_paint_;
}

void WebContentsImpl::OnDidDownloadImage(
    ImageDownloadCallback callback,
    int id,
    const GURL& image_url,
    int32_t http_status_code,
    const std::vector<SkBitmap>& images,
    const std::vector<gfx::Size>& original_image_sizes) {
  std::move(callback).Run(id, http_status_code, image_url, images,
                          original_image_sizes);
}

void WebContentsImpl::OnDialogClosed(int render_process_id,
                                     int render_frame_id,
                                     IPC::Message* reply_msg,
                                     bool dialog_was_suppressed,
                                     bool success,
                                     const base::string16& user_input) {
  RenderFrameHostImpl* rfh = RenderFrameHostImpl::FromID(render_process_id,
                                                         render_frame_id);
  last_dialog_suppressed_ = dialog_was_suppressed;

  javascript_dialog_navigation_deferrer_.reset();

  if (is_showing_before_unload_dialog_ && !success) {
    // It is possible for the current RenderFrameHost to have changed in the
    // meantime.  Do not reset the navigation state in that case.
    if (rfh && rfh == rfh->frame_tree_node()->current_frame_host()) {
      rfh->frame_tree_node()->BeforeUnloadCanceled();
      controller_.DiscardNonCommittedEntries();
    }

    // Update the URL display either way, to avoid showing a stale URL.
    NotifyNavigationStateChanged(INVALIDATE_TYPE_URL);

    for (auto& observer : observers_)
      observer.BeforeUnloadDialogCancelled();
  }

  if (rfh) {
    rfh->JavaScriptDialogClosed(reply_msg, success, user_input);

    std::vector<protocol::PageHandler*> page_handlers =
        protocol::PageHandler::EnabledForWebContents(this);
    for (auto* handler : page_handlers)
      handler->DidCloseJavaScriptDialog(success, user_input);

  } else {
    // Don't leak the sync IPC reply if the RFH or process is gone.
    delete reply_msg;
  }

  is_showing_javascript_dialog_ = false;
  is_showing_before_unload_dialog_ = false;
}

void WebContentsImpl::SetEncoding(const std::string& encoding) {
  if (encoding == last_reported_encoding_)
    return;
  last_reported_encoding_ = encoding;

  canonical_encoding_ = base::GetCanonicalEncodingNameByAliasName(encoding);
}

bool WebContentsImpl::IsHidden() {
  return !IsBeingCaptured() && visibility_ != Visibility::VISIBLE;
}

int WebContentsImpl::GetOuterDelegateFrameTreeNodeId() {
  return node_.outer_contents_frame_tree_node_id();
}

RenderWidgetHostImpl* WebContentsImpl::GetFullscreenRenderWidgetHost() const {
  return RenderWidgetHostImpl::FromID(fullscreen_widget_process_id_,
                                      fullscreen_widget_routing_id_);
}

RenderFrameHostManager* WebContentsImpl::GetRenderManager() const {
  return frame_tree_.root()->render_manager();
}

BrowserPluginGuest* WebContentsImpl::GetBrowserPluginGuest() const {
  return browser_plugin_guest_.get();
}

void WebContentsImpl::SetBrowserPluginGuest(
    std::unique_ptr<BrowserPluginGuest> guest) {
  DCHECK(!browser_plugin_guest_);
  DCHECK(guest);
  browser_plugin_guest_ = std::move(guest);
}

base::UnguessableToken WebContentsImpl::GetAudioGroupId() {
  if (!base::FeatureList::IsEnabled(features::kAudioServiceAudioStreams))
    return base::UnguessableToken::Null();

  return GetAudioStreamFactory()->group_id();
}

ukm::SourceId WebContentsImpl::GetLastCommittedSourceId() {
  return last_committed_source_id_;
}

BrowserPluginEmbedder* WebContentsImpl::GetBrowserPluginEmbedder() const {
  return browser_plugin_embedder_.get();
}

void WebContentsImpl::CreateBrowserPluginEmbedderIfNecessary() {
  if (browser_plugin_embedder_)
    return;
  browser_plugin_embedder_.reset(BrowserPluginEmbedder::Create(this));
}

gfx::Size WebContentsImpl::GetSizeForNewRenderView(bool is_main_frame) {
  gfx::Size size;
  if (is_main_frame)
    size = device_emulation_size_;
  if (size.IsEmpty() && delegate_)
    size = delegate_->GetSizeForNewRenderView(this);
  if (size.IsEmpty())
    size = GetContainerBounds().size();
  return size;
}

void WebContentsImpl::OnFrameRemoved(RenderFrameHost* render_frame_host) {
  for (auto& observer : observers_)
    observer.FrameDeleted(render_frame_host);
}

void WebContentsImpl::OnPreferredSizeChanged(const gfx::Size& old_size) {
  if (!delegate_)
    return;
  const gfx::Size new_size = GetPreferredSize();
  if (new_size != old_size)
    delegate_->UpdatePreferredSize(this, new_size);
}

void WebContentsImpl::SendUserGestureForResourceDispatchHost() {
  // This is null in unittests. =(
  ResourceDispatcherHostImpl* rdh = ResourceDispatcherHostImpl::Get();

  if (rdh)
    rdh->OnUserGesture();
}

std::unique_ptr<WebUIImpl> WebContentsImpl::CreateWebUI(const GURL& url) {
  std::unique_ptr<WebUIImpl> web_ui = std::make_unique<WebUIImpl>(this);
  std::unique_ptr<WebUIController> controller(
      WebUIControllerFactoryRegistry::GetInstance()
          ->CreateWebUIControllerForURL(web_ui.get(), url));
  if (controller) {
    web_ui->AddMessageHandler(std::make_unique<GenericHandler>());
    web_ui->SetController(std::move(controller));
    return web_ui;
  }

  return nullptr;
}

FindRequestManager* WebContentsImpl::GetFindRequestManager() {
  for (auto* contents = this; contents;
       contents = contents->GetOuterWebContents()) {
    if (contents->find_request_manager_)
      return contents->find_request_manager_.get();
  }

  return nullptr;
}

FindRequestManager* WebContentsImpl::GetOrCreateFindRequestManager() {
  if (FindRequestManager* manager = GetFindRequestManager())
    return manager;

  DCHECK(!browser_plugin_guest_ || GetOuterWebContents());

  // No existing FindRequestManager found, so one must be created.
  find_request_manager_.reset(new FindRequestManager(this));

  // Concurrent find sessions must not overlap, so destroy any existing
  // FindRequestManagers in any inner WebContentses.
  for (WebContents* contents : GetWebContentsAndAllInner()) {
    auto* web_contents_impl = static_cast<WebContentsImpl*>(contents);
    if (web_contents_impl == this)
      continue;
    if (web_contents_impl->find_request_manager_) {
      web_contents_impl->find_request_manager_->StopFinding(
          STOP_FIND_ACTION_CLEAR_SELECTION);
      web_contents_impl->find_request_manager_.release();
    }
  }

  return find_request_manager_.get();
}

void WebContentsImpl::NotifyFindReply(int request_id,
                                      int number_of_matches,
                                      const gfx::Rect& selection_rect,
                                      int active_match_ordinal,
                                      bool final_update) {
  if (delegate_ && !is_being_destroyed_ &&
      !GetMainFrame()->GetProcess()->FastShutdownStarted()) {
    delegate_->FindReply(this, request_id, number_of_matches, selection_rect,
                         active_match_ordinal, final_update);
  }
}

void WebContentsImpl::IncrementBluetoothConnectedDeviceCount() {
  // Trying to invalidate the tab state while being destroyed could result in a
  // use after free.
  if (IsBeingDestroyed()) {
    return;
  }
  // Notify for UI updates if the state changes.
  bluetooth_connected_device_count_++;
  if (bluetooth_connected_device_count_ == 1) {
    NotifyNavigationStateChanged(INVALIDATE_TYPE_TAB);
  }
}

void WebContentsImpl::DecrementBluetoothConnectedDeviceCount() {
  // Trying to invalidate the tab state while being destroyed could result in a
  // use after free.
  if (IsBeingDestroyed()) {
    return;
  }
  // Notify for UI updates if the state changes.
  DCHECK_NE(bluetooth_connected_device_count_, 0u);
  bluetooth_connected_device_count_--;
  if (bluetooth_connected_device_count_ == 0) {
    NotifyNavigationStateChanged(INVALIDATE_TYPE_TAB);
  }
}

void WebContentsImpl::IncrementSerialActiveFrameCount() {
  // Trying to invalidate the tab state while being destroyed could result in a
  // use after free.
  if (IsBeingDestroyed())
    return;

  // Notify for UI updates if the state changes.
  serial_active_frame_count_++;
  if (serial_active_frame_count_ == 1)
    NotifyNavigationStateChanged(INVALIDATE_TYPE_TAB);
}

void WebContentsImpl::DecrementSerialActiveFrameCount() {
  // Trying to invalidate the tab state while being destroyed could result in a
  // use after free.
  if (IsBeingDestroyed())
    return;

  // Notify for UI updates if the state changes.
  DCHECK_NE(0u, serial_active_frame_count_);
  serial_active_frame_count_--;
  if (serial_active_frame_count_ == 0)
    NotifyNavigationStateChanged(INVALIDATE_TYPE_TAB);
}

void WebContentsImpl::AddNativeFileSystemDirectoryHandle(
    const base::FilePath& path) {
  // Trying to invalidate the tab state while being destroyed could result in a
  // use after free.
  if (IsBeingDestroyed())
    return;

  // Notify for UI updates if the state changes. Need both TYPE_TAB and TYPE_URL
  // to update both the tab-level usage indicator and the usage indicator in the
  // omnibox.
  const bool was_empty = native_file_system_directory_handles_.empty();
  native_file_system_directory_handles_[path]++;
  if (was_empty) {
    NotifyNavigationStateChanged(static_cast<content::InvalidateTypes>(
        INVALIDATE_TYPE_TAB | INVALIDATE_TYPE_URL));
  }
}

void WebContentsImpl::RemoveNativeFileSystemDirectoryHandle(
    const base::FilePath& path) {
  // Trying to invalidate the tab state while being destroyed could result in a
  // use after free.
  if (IsBeingDestroyed())
    return;

  // Notify for UI updates if the state changes. Need both TYPE_TAB and TYPE_URL
  // to update both the tab-level usage indicator and the usage indicator in the
  // omnibox.
  auto it = native_file_system_directory_handles_.find(path);
  DCHECK(it != native_file_system_directory_handles_.end());
  DCHECK_NE(0u, it->second);
  it->second--;
  if (it->second == 0)
    native_file_system_directory_handles_.erase(it);
  if (native_file_system_directory_handles_.empty()) {
    NotifyNavigationStateChanged(static_cast<content::InvalidateTypes>(
        INVALIDATE_TYPE_TAB | INVALIDATE_TYPE_URL));
  }
}

void WebContentsImpl::IncrementWritableNativeFileSystemHandleCount() {
  // Trying to invalidate the tab state while being destroyed could result in a
  // use after free.
  if (IsBeingDestroyed())
    return;

  // Notify for UI updates if the state changes. Need both TYPE_TAB and TYPE_URL
  // to update both the tab-level usage indicator and the usage indicator in the
  // omnibox.
  native_file_system_writable_handle_count_++;
  if (native_file_system_writable_handle_count_ == 1) {
    NotifyNavigationStateChanged(static_cast<content::InvalidateTypes>(
        INVALIDATE_TYPE_TAB | INVALIDATE_TYPE_URL));
  }
}

void WebContentsImpl::DecrementWritableNativeFileSystemHandleCount() {
  // Trying to invalidate the tab state while being destroyed could result in a
  // use after free.
  if (IsBeingDestroyed())
    return;

  // Notify for UI updates if the state changes. Need both TYPE_TAB and TYPE_URL
  // to update both the tab-level usage indicator and the usage indicator in the
  // omnibox.
  DCHECK_NE(0u, native_file_system_writable_handle_count_);
  native_file_system_writable_handle_count_--;
  if (native_file_system_writable_handle_count_ == 0) {
    NotifyNavigationStateChanged(static_cast<content::InvalidateTypes>(
        INVALIDATE_TYPE_TAB | INVALIDATE_TYPE_URL));
  }
}

void WebContentsImpl::SetHasPersistentVideo(bool has_persistent_video) {
  if (has_persistent_video_ == has_persistent_video)
    return;

  has_persistent_video_ = has_persistent_video;
  NotifyPreferencesChanged();
  media_web_contents_observer()->RequestPersistentVideo(has_persistent_video);
}

void WebContentsImpl::SetSpatialNavigationDisabled(bool disabled) {
  if (is_spatial_navigation_disabled_ == disabled)
    return;

  is_spatial_navigation_disabled_ = disabled;
  NotifyPreferencesChanged();
}

void WebContentsImpl::BrowserPluginGuestWillDetach() {
  WebContentsImpl* outermost = GetOutermostWebContents();
  if (this != outermost && ContainsOrIsFocusedWebContents())
    outermost->SetAsFocusedWebContentsIfNecessary();
}

PictureInPictureResult WebContentsImpl::EnterPictureInPicture(
    const viz::SurfaceId& surface_id,
    const gfx::Size& natural_size) {
  return delegate_
             ? delegate_->EnterPictureInPicture(this, surface_id, natural_size)
             : PictureInPictureResult::kNotSupported;
}

void WebContentsImpl::ExitPictureInPicture() {
  if (delegate_)
    delegate_->ExitPictureInPicture();
}

#if defined(OS_ANDROID)
void WebContentsImpl::NotifyFindMatchRectsReply(
    int version,
    const std::vector<gfx::RectF>& rects,
    const gfx::RectF& active_rect) {
  if (delegate_)
    delegate_->FindMatchRectsReply(this, version, rects, active_rect);
}
#endif

void WebContentsImpl::SetForceDisableOverscrollContent(bool force_disable) {
  force_disable_overscroll_content_ = force_disable;
  if (view_)
    view_->SetOverscrollControllerEnabled(CanOverscrollContent());
}

bool WebContentsImpl::SetDeviceEmulationSize(const gfx::Size& new_size) {
  device_emulation_size_ = new_size;
  RenderWidgetHostView* rwhv = GetMainFrame()->GetView();

  const gfx::Size current_size = rwhv->GetViewBounds().size();
  if (view_size_before_emulation_.IsEmpty())
    view_size_before_emulation_ = current_size;

  if (current_size != new_size)
    rwhv->SetSize(new_size);

  return current_size != new_size;
}

void WebContentsImpl::ClearDeviceEmulationSize() {
  RenderWidgetHostView* rwhv = GetMainFrame()->GetView();
  // WebContentsView could get resized during emulation, which also resizes
  // RWHV. If it happens, assume user would like to keep using the size after
  // emulation.
  // TODO(jzfeng): Prohibit resizing RWHV through any other means (at least when
  // WebContentsView size changes).
  if (!view_size_before_emulation_.IsEmpty() && rwhv &&
      rwhv->GetViewBounds().size() == device_emulation_size_) {
    rwhv->SetSize(view_size_before_emulation_);
  }
  device_emulation_size_ = gfx::Size();
  view_size_before_emulation_ = gfx::Size();
}

ForwardingAudioStreamFactory* WebContentsImpl::GetAudioStreamFactory() {
  if (!audio_stream_factory_) {
    audio_stream_factory_.emplace(
        this,
        // BrowserMainLoop::GetInstance() may be null in unit tests.
        BrowserMainLoop::GetInstance()
            ? static_cast<media::UserInputMonitorBase*>(
                  BrowserMainLoop::GetInstance()->user_input_monitor())
            : nullptr,
        GetSystemConnector()->Clone(), AudioStreamBrokerFactory::CreateImpl());
  }

  return &*audio_stream_factory_;
}

void WebContentsImpl::MediaStartedPlaying(
    const WebContentsObserver::MediaPlayerInfo& media_info,
    const MediaPlayerId& id) {
  if (media_info.has_video)
    currently_playing_video_count_++;

  for (auto& observer : observers_)
    observer.MediaStartedPlaying(media_info, id);
}

void WebContentsImpl::MediaStoppedPlaying(
    const WebContentsObserver::MediaPlayerInfo& media_info,
    const MediaPlayerId& id,
    WebContentsObserver::MediaStoppedReason reason) {
  if (media_info.has_video)
    currently_playing_video_count_--;

  for (auto& observer : observers_)
    observer.MediaStoppedPlaying(media_info, id, reason);
}

void WebContentsImpl::MediaResized(const gfx::Size& size,
                                   const MediaPlayerId& id) {
  cached_video_sizes_[id] = size;

  for (auto& observer : observers_)
    observer.MediaResized(size, id);
}

void WebContentsImpl::MediaEffectivelyFullscreenChanged(bool is_fullscreen) {
  for (auto& observer : observers_)
    observer.MediaEffectivelyFullscreenChanged(is_fullscreen);
}

base::Optional<gfx::Size> WebContentsImpl::GetFullscreenVideoSize() {
  base::Optional<MediaPlayerId> id =
      media_web_contents_observer_->GetFullscreenVideoMediaPlayerId();
  if (id && base::Contains(cached_video_sizes_, id.value()))
    return base::Optional<gfx::Size>(cached_video_sizes_[id.value()]);
  return base::nullopt;
}

int WebContentsImpl::GetCurrentlyPlayingVideoCount() {
  return currently_playing_video_count_;
}

void WebContentsImpl::AudioContextPlaybackStarted(RenderFrameHost* host,
                                                  int context_id) {
  WebContentsObserver::AudioContextId audio_context_id(host, context_id);
  for (auto& observer : observers_)
    observer.AudioContextPlaybackStarted(audio_context_id);
}

void WebContentsImpl::AudioContextPlaybackStopped(RenderFrameHost* host,
                                                  int context_id) {
  WebContentsObserver::AudioContextId audio_context_id(host, context_id);
  for (auto& observer : observers_)
    observer.AudioContextPlaybackStopped(audio_context_id);
}

RenderFrameHostImpl* WebContentsImpl::GetMainFrameForInnerDelegate(
    FrameTreeNode* frame_tree_node) {
  if (auto* web_contents = node_.GetInnerWebContentsInFrame(frame_tree_node))
    return web_contents->GetMainFrame();
  return nullptr;
}

void WebContentsImpl::UpdateWebContentsVisibility(Visibility visibility) {
  // Occlusion is disabled when |features::kWebContentsOcclusion| is disabled
  // (for power and speed impact assessment) or when
  // |switches::kDisableBackgroundingOccludedWindowsForTesting| is specified on
  // the command line (to avoid flakiness in browser tests).
  const bool occlusion_is_disabled =
      !base::FeatureList::IsEnabled(features::kWebContentsOcclusion) ||
      base::CommandLine::ForCurrentProcess()->HasSwitch(
          switches::kDisableBackgroundingOccludedWindowsForTesting);
  if (occlusion_is_disabled && visibility == Visibility::OCCLUDED)
    visibility = Visibility::VISIBLE;

  if (!did_first_set_visible_) {
    if (visibility == Visibility::VISIBLE) {
      // A WebContents created with CreateParams::initially_hidden = false
      // starts with GetVisibility() == Visibility::VISIBLE even though it is
      // not really visible. Call WasShown() when it becomes visible for real as
      // the page load mechanism and some WebContentsObserver rely on that.
      WasShown();
      did_first_set_visible_ = true;
    }

    // Trust the initial visibility of the WebContents and do not switch it to
    // HIDDEN or OCCLUDED before it becomes VISIBLE for real. Doing so would
    // result in destroying resources that would immediately be recreated (e.g.
    // UpdateWebContents(HIDDEN) can be called when a WebContents is added to a
    // hidden window that is about to be shown).

    return;
  }

  if (visibility == visibility_)
    return;

  if (visibility == Visibility::VISIBLE)
    WasShown();
  else if (visibility == Visibility::OCCLUDED)
    WasOccluded();
  else
    WasHidden();
}

void WebContentsImpl::UpdateOverridingUserAgent() {
  NotifyPreferencesChanged();
}

void WebContentsImpl::SetJavaScriptDialogManagerForTesting(
    JavaScriptDialogManager* dialog_manager) {
  dialog_manager_ = dialog_manager;
}

void WebContentsImpl::RemoveBindingSet(const std::string& interface_name) {
  auto it = binding_sets_.find(interface_name);
  if (it != binding_sets_.end())
    binding_sets_.erase(it);
}

bool WebContentsImpl::AddDomainInfoToRapporSample(rappor::Sample* sample) {
  // Here we associate this metric to the main frame URL regardless of what
  // caused it.
  sample->SetStringField("Domain", ::rappor::GetDomainAndRegistrySampleFromGURL(
                                       GetLastCommittedURL()));
  return true;
}

void WebContentsImpl::FocusedNodeTouched(bool editable) {
#if defined(OS_WIN)
  RenderWidgetHostView* view = GetRenderWidgetHostView();
  if (!view)
    return;
  view->FocusedNodeTouched(editable);
#endif
}

void WebContentsImpl::ShowInsecureLocalhostWarningIfNeeded() {
  bool allow_localhost = base::CommandLine::ForCurrentProcess()->HasSwitch(
      switches::kAllowInsecureLocalhost);
  if (!allow_localhost)
    return;

  content::NavigationEntry* entry = GetController().GetLastCommittedEntry();
  if (!entry || !net::IsLocalhost(entry->GetURL()))
    return;

  content::SSLStatus ssl_status = entry->GetSSL();
  bool is_cert_error = net::IsCertStatusError(ssl_status.cert_status) &&
                       !net::IsCertStatusMinorError(ssl_status.cert_status);
  if (!is_cert_error)
    return;

  GetMainFrame()->AddMessageToConsole(
      blink::mojom::ConsoleMessageLevel::kWarning,
      base::StringPrintf("This site does not have a valid SSL "
                         "certificate! Without SSL, your site's and "
                         "visitors' data is vulnerable to theft and "
                         "tampering. Get a valid SSL certificate before"
                         " releasing your website to the public."));
}

bool WebContentsImpl::IsShowingContextMenuOnPage() const {
  return showing_context_menu_;
}

download::DownloadUrlParameters::RequestHeadersType
WebContentsImpl::ParseDownloadHeaders(const std::string& headers) {
  download::DownloadUrlParameters::RequestHeadersType request_headers;
  for (const base::StringPiece& key_value : base::SplitStringPiece(
           headers, "\r\n", base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY)) {
    std::vector<std::string> pair = base::SplitString(
        key_value, ":", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
    if (2ul == pair.size())
      request_headers.push_back(make_pair(pair[0], pair[1]));
  }
  return request_headers;
}

void WebContentsImpl::SetOpenerForNewContents(FrameTreeNode* opener,
                                              bool opener_suppressed) {
  if (opener) {
    FrameTreeNode* new_root = GetFrameTree()->root();

    // For the "original opener", track the opener's main frame instead, because
    // if the opener is a subframe, the opener tracking could be easily bypassed
    // by spawning from a subframe and deleting the subframe.
    // https://crbug.com/705316
    new_root->SetOriginalOpener(opener->frame_tree()->root());

    if (!opener_suppressed) {
      new_root->SetOpener(opener);
      created_with_opener_ = true;
    }
  }
}

void WebContentsImpl::MediaMutedStatusChanged(const MediaPlayerId& id,
                                              bool muted) {
  for (auto& observer : observers_)
    observer.MediaMutedStatusChanged(id, muted);
}

void WebContentsImpl::SetVisibilityForChildViews(bool visible) {
  GetMainFrame()->SetVisibilityForChildViews(visible);
}

void WebContentsImpl::OnNativeThemeUpdated(ui::NativeTheme* observed_theme) {
  DCHECK(native_theme_observer_.IsObserving(observed_theme));

  bool in_dark_mode = observed_theme->SystemDarkModeEnabled();
  bool in_high_contrast = observed_theme->UsesHighContrastColors();
  ui::NativeTheme::PreferredColorScheme preferred_color_scheme =
      observed_theme->GetPreferredColorScheme();
  bool preferences_changed = false;

  if (in_dark_mode_ != in_dark_mode) {
    in_dark_mode_ = in_dark_mode;
    preferences_changed = true;
  }
  if (in_high_contrast_ != in_high_contrast) {
    in_high_contrast_ = in_high_contrast;
    preferences_changed = true;
  }
  if (preferred_color_scheme_ != preferred_color_scheme) {
    preferred_color_scheme_ = preferred_color_scheme;
    preferences_changed = true;
  }

  if (preferences_changed)
    NotifyPreferencesChanged();
}

mojom::FrameInputHandler* WebContentsImpl::GetFocusedFrameInputHandler() {
  auto* focused_frame = GetFocusedFrame();
  if (!focused_frame)
    return nullptr;
  return focused_frame->GetFrameInputHandler();
}

}  // namespace content