NOT FOR LANDING Implement WebMediaSession

content/browser/media/media_web_contents_observer.h

Index: content/browser/media/media_web_contents_observer.h
diff --git a/content/browser/media/media_web_contents_observer.h b/content/browser/media/media_web_contents_observer.h
index 8fbe08084fa1428562b9bfbeba47544cd29f0fcc..f03695294f53fce7cd6a049d8267c5ae9c9f3d4e 100644
--- a/content/browser/media/media_web_contents_observer.h
+++ b/content/browser/media/media_web_contents_observer.h
@@ -19,6 +19,7 @@ class MediaPlayersObserver;
 
 class BrowserCdmManager;
 class BrowserMediaPlayerManager;
+class BrowserMediaSessionManager;
 
 // This class manages all RenderFrame based media related managers at the
 // browser side. It receives IPC messages from media RenderFrameObservers and
@@ -48,6 +49,9 @@ class CONTENT_EXPORT MediaWebContentsObserver : public WebContentsObserver {
   BrowserMediaPlayerManager* GetMediaPlayerManager(
       RenderFrameHost* render_frame_host);
 
+  BrowserMediaSessionManager* GetMediaSessionManager(
+      RenderFrameHost* render_frame_host);
+
   void OnSetCdm(RenderFrameHost* render_frame_host, int player_id, int cdm_id);
 
   MediaPlayersObserver* GetMediaPlayersObserver() const;
@@ -62,6 +66,12 @@ class CONTENT_EXPORT MediaWebContentsObserver : public WebContentsObserver {
                                  scoped_ptr<BrowserMediaPlayerManager>>
       MediaPlayerManagerMap;
   MediaPlayerManagerMap media_player_managers_;
+
+  // Map from RenderFrameHost* to BrowserMediaSessionManager.
+  typedef base::ScopedPtrHashMap<uintptr_t,
+                                 scoped_ptr<BrowserMediaSessionManager>>
+      MediaSessionManagerMap;
+  MediaSessionManagerMap media_session_managers_;
 #endif  // defined(OS_ANDROID)
 
  private: