Thread triggering event info into OpenURLParams

The OpenURLParams has knowledge of user_gesture, which is great to feed
into the existing popup blocking heuristics. However, it is very common
for sites to "steal" a user gesture to use for script-initiated
(click-jacking) popups / navigations.

This CL threads an additional bit of information through via IPC to
the OpenURLParams: the trusted state of the JS triggering event which led to
this navigation request.

Docs for Event.isTrusted can be found here:
https://developer.mozilla.org/en-US/docs/Web/API/Event/isTrusted

This extra bit can be used to explore additional popup blocking heuristics,
and is planned to be used in conjunction with the subresource_filter
component.

Bug: 733330
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_site_isolation
Change-Id: Iac45ed4800989b45a006483b5e6a6b943e6c5af9
Reviewed-on: https://chromium-review.googlesource.com/539898
Commit-Queue: Charlie Harrison <[email protected]>
Reviewed-by: Daniel Cheng <[email protected]>
Reviewed-by: Nasko Oskov <[email protected]>
Cr-Commit-Position: refs/heads/master@{#481112}
diff --git a/content/browser/frame_host/navigator_impl.h b/content/browser/frame_host/navigator_impl.h
index 648e209..32fabc7 100644
--- a/content/browser/frame_host/navigator_impl.h
+++ b/content/browser/frame_host/navigator_impl.h
@@ -64,16 +64,18 @@
                               bool is_same_document_history_load) override;
   bool NavigateNewChildFrame(RenderFrameHostImpl* render_frame_host,
                              const GURL& default_url) override;
-  void RequestOpenURL(RenderFrameHostImpl* render_frame_host,
-                      const GURL& url,
-                      bool uses_post,
-                      const scoped_refptr<ResourceRequestBodyImpl>& body,
-                      const std::string& extra_headers,
-                      const Referrer& referrer,
-                      WindowOpenDisposition disposition,
-                      bool force_new_process_for_new_contents,
-                      bool should_replace_current_entry,
-                      bool user_gesture) override;
+  void RequestOpenURL(
+      RenderFrameHostImpl* render_frame_host,
+      const GURL& url,
+      bool uses_post,
+      const scoped_refptr<ResourceRequestBodyImpl>& body,
+      const std::string& extra_headers,
+      const Referrer& referrer,
+      WindowOpenDisposition disposition,
+      bool force_new_process_for_new_contents,
+      bool should_replace_current_entry,
+      bool user_gesture,
+      blink::WebTriggeringEventInfo triggering_event_info) override;
   void RequestTransferURL(RenderFrameHostImpl* render_frame_host,
                           const GURL& url,
                           SiteInstance* source_site_instance,