Implements frame sniffer to watch iframe loading state.

Also sniffer listener was implemented on the WebUI side, which signals when
GAIA page loading error appears.

BUG=chromium-os:18744
TEST=Behind captive portal, try to click 'Add new user'. Corresponding message page should be shown.

Review URL: http://codereview.chromium.org/7779010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@99777 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/chromeos/tab_first_render_watcher.cc b/chrome/browser/chromeos/tab_first_render_watcher.cc
index fecb253..97683770 100644
--- a/chrome/browser/chromeos/tab_first_render_watcher.cc
+++ b/chrome/browser/chromeos/tab_first_render_watcher.cc
@@ -5,6 +5,7 @@
 #include "chrome/browser/chromeos/tab_first_render_watcher.h"
 
 #include "content/browser/renderer_host/render_widget_host.h"
+#include "content/browser/renderer_host/render_view_host.h"
 #include "content/common/content_notification_types.h"
 #include "content/common/notification_details.h"
 #include "content/common/notification_source.h"
@@ -32,6 +33,7 @@
       registrar_.Add(this,
           content::NOTIFICATION_RENDER_WIDGET_HOST_DID_PAINT,
           Source<RenderWidgetHost>(rwh));
+      delegate_->OnRenderHostCreated(Details<RenderViewHost>(details).ptr());
       break;
     }
     case content::NOTIFICATION_LOAD_COMPLETED_MAIN_FRAME: