Propagate media play/pause to WebContentsObserver for Chromecast metrics

content/public/browser/web_contents_observer.h

Index: content/public/browser/web_contents_observer.h
diff --git a/content/public/browser/web_contents_observer.h b/content/public/browser/web_contents_observer.h
index a176d18cbb06363238243250980f44e7083962b3..cb7198a088dfd75305e193aa15899ec8898f130a 100644
--- a/content/public/browser/web_contents_observer.h
+++ b/content/public/browser/web_contents_observer.h
@@ -343,6 +343,12 @@ class CONTENT_EXPORT WebContentsObserver : public IPC::Listener,
   // Invoked when theme color is changed to |theme_color|.
   virtual void DidChangeThemeColor(SkColor theme_color) {}
 
+  // Invoked when media is playing.
+  virtual void MediaPlayingNotification() {}

[nasko, 2015/03/25 22:31:58]

The name of this method doesn't quite fit the naming format used by other
observer methods. MediaStartedPlaying or something along those lines seems a bit
better, since "Notification" is somewhat implied from the fact that this is
observer method.

[prashantv, 2015/03/25 22:44:35]

Done.

+
+  // Invoked when media is paused.
+  virtual void MediaPausedNotification() {}
+
   // Invoked if an IPC message is coming from a specific RenderFrameHost.
   virtual bool OnMessageReceived(const IPC::Message& message,
                                  RenderFrameHost* render_frame_host);