Hook up RendererMediaSessionManager with browser side

content/renderer/media/android/renderer_media_session_manager.h

Index: content/renderer/media/android/renderer_media_session_manager.h
diff --git a/content/renderer/media/android/renderer_media_session_manager.h b/content/renderer/media/android/renderer_media_session_manager.h
index f07b230c113f671884dc25c30d4b714c7bd0a258..1454f8aa34201f7fc27e1abb7191ebab4e4e52b7 100644
--- a/content/renderer/media/android/renderer_media_session_manager.h
+++ b/content/renderer/media/android/renderer_media_session_manager.h
@@ -20,9 +20,18 @@ class CONTENT_EXPORT RendererMediaSessionManager : public RenderFrameObserver {
   RendererMediaSessionManager(RenderFrame* render_frame);
   ~RendererMediaSessionManager() override;
 
+  // RenderFrameObserver override.
+  bool OnMessageReceived(const IPC::Message& msg) override;
+
   int RegisterMediaSession(WebMediaSessionAndroid* session);
   void UnregisterMediaSession(int session_id);
 
+  void Activate(int session_id, int activation_id);
+  void Deactivate(int session_id, int deactivation_id);
+
+  void OnDidActivate(int session_id, int activation_id, bool success);
+  void OnDidDeactivate(int session_id, int deactivation_id);

[mlamouri (slow - plz ping), 2015/12/02 15:53:31]

nit: use request_id for the four new methods here.

[davve, 2015/12/04 12:43:09]

Done.

+
  private:
   friend class WebMediaSessionTest;