Hook up RendererMediaSessionManager with browser side

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 382dcdf772f63b00749b65918d4d87bcd3098028..ac32ca0f62d335ff47b8e0c35f27ee3cb8836f47 100644
--- a/content/browser/media/media_web_contents_observer.h
+++ b/content/browser/media/media_web_contents_observer.h
@@ -14,6 +14,7 @@ namespace content {
 
 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
@@ -43,6 +44,9 @@ 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);
 
 #if defined(VIDEO_HOLE)
@@ -55,6 +59,12 @@ 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: