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 0a249130eb5c05a48d616d011752ba8d3a2456e0..4af84a458ee924057a32f0f0328b47488662a44a 100644
--- a/content/browser/media/media_web_contents_observer.h
+++ b/content/browser/media/media_web_contents_observer.h
@@ -19,6 +19,7 @@ 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
@@ -46,6 +47,9 @@ class CONTENT_EXPORT MediaWebContentsObserver : public WebContentsObserver {
   BrowserMediaPlayerManager* GetMediaPlayerManager(
       RenderFrameHost* render_frame_host);
 
+  BrowserMediaSessionManager* GetMediaSessionManager(
+      RenderFrameHost* render_frame_host);
+
 #if defined(VIDEO_HOLE)
   void OnFrameInfoUpdated();
 #endif  // defined(VIDEO_HOLE)
@@ -113,6 +117,12 @@ class CONTENT_EXPORT MediaWebContentsObserver : public WebContentsObserver {
       base::ScopedPtrHashMap<RenderFrameHost*,
                              scoped_ptr<BrowserMediaPlayerManager>>;
   MediaPlayerManagerMap media_player_managers_;
+
+  // Map from RenderFrameHost* to BrowserMediaSessionManager.
+  using MediaSessionManagerMap =
+      base::ScopedPtrHashMap<RenderFrameHost*,
+                             scoped_ptr<BrowserMediaSessionManager>>;
+  MediaSessionManagerMap media_session_managers_;
 #endif  // defined(OS_ANDROID)
 
   // Tracking variables and associated power save blockers for media playback.