Implement MediaSession on top of the WebMediaPlayerDelegate.

content/browser/media/android/media_web_contents_observer_android.h

Index: content/browser/media/android/media_web_contents_observer_android.h
diff --git a/content/browser/media/android/media_web_contents_observer_android.h b/content/browser/media/android/media_web_contents_observer_android.h
index b04a30cb1b80ea89cc0e6267fb8e7a8df1616fd5..547762ceb28f8714e6e6da7636f2855b25a45b73 100644
--- a/content/browser/media/android/media_web_contents_observer_android.h
+++ b/content/browser/media/android/media_web_contents_observer_android.h
@@ -24,6 +24,7 @@ namespace content {
 class BrowserCdmManager;
 class BrowserMediaPlayerManager;
 class BrowserMediaSessionManager;
+class MediaSessionController;
 
 // This class adds Android specific extensions to the MediaWebContentsObserver.
 class CONTENT_EXPORT MediaWebContentsObserverAndroid
@@ -54,6 +55,22 @@ class CONTENT_EXPORT MediaWebContentsObserverAndroid
                          RenderFrameHost* render_frame_host) override;
 
  private:
+  // Handles messages for the media player delgate; does not modify the handled

[mlamouri (slow - plz ping), 2016/01/14 15:43:08]

typo: delegate

+  // state since the superclass needs to handle these as well.
+  void OnMediaPlayerDelegateMessageReceived(const IPC::Message& msg,
+                                            RenderFrameHost* render_frame_host);
+  void OnMediaDestroyedNotification(RenderFrameHost* render_frame_host,
+                                    int64_t player_cookie);
+  void OnMediaPlayingNotification(RenderFrameHost* render_frame_host,
+                                  int64_t player_cookie,
+                                  bool has_video,
+                                  bool has_audio,
+                                  bool is_remote,
+                                  base::TimeDelta duration);
+  void OnMediaPausedNotification(RenderFrameHost* render_frame_host,
+                                 int64_t player_cookie,
+                                 bool reached_end_of_stream);
+
   // Helper functions to handle media player IPC messages. Returns whether the
   // |message| is handled in the function.
   bool OnMediaPlayerMessageReceived(const IPC::Message& message,
@@ -76,6 +93,11 @@ class CONTENT_EXPORT MediaWebContentsObserverAndroid
                              scoped_ptr<BrowserMediaSessionManager>>;
   MediaSessionManagerMap media_session_managers_;
 
+  // Map of renderer side media players to session controllers.
+  using MediaSessionMap =
+      std::map<MediaPlayerId, scoped_ptr<MediaSessionController>>;
+  MediaSessionMap media_session_map_;
+
   DISALLOW_COPY_AND_ASSIGN(MediaWebContentsObserverAndroid);
 };