Adding a skeleton MediaStreamCenter.

content/renderer/media/media_stream_impl.h

Index: content/renderer/media/media_stream_impl.h
diff --git a/content/renderer/media/media_stream_impl.h b/content/renderer/media/media_stream_impl.h
index 503c510b12659c43c84580402d10476ea3f617fb..67ddb8b945cb603c3405b651011c59b94b46b287 100644
--- a/content/renderer/media/media_stream_impl.h
+++ b/content/renderer/media/media_stream_impl.h
@@ -41,10 +41,13 @@ class Thread;
 }
 
 namespace WebKit {
+class WebMediaStreamCenter;
+class WebMediaStreamCenterClient;
 class WebPeerConnectionHandler;
 class WebPeerConnectionHandlerClient;
 }
 
+class MediaStreamCenter;
 class MediaStreamDispatcher;
 class MediaStreamDependencyFactory;
 class PeerConnectionHandler;
@@ -72,6 +75,8 @@ class CONTENT_EXPORT MediaStreamImpl
 
   virtual WebKit::WebPeerConnectionHandler* CreatePeerConnectionHandler(
       WebKit::WebPeerConnectionHandlerClient* client);
+  virtual WebKit::WebMediaStreamCenter* CreateMediaStreamCenter(
+      WebKit::WebMediaStreamCenterClient* client);
   virtual void ClosePeerConnection();
   virtual webrtc::MediaStreamTrackInterface* GetLocalMediaStreamTrack(
       const std::string& label);
@@ -158,6 +163,9 @@ class CONTENT_EXPORT MediaStreamImpl
   // TODO(grunell): Support several PeerConnectionsHandlers.
   PeerConnectionHandler* peer_connection_handler_;
 
+  // media_stream_center_ is a weak reference, owned by WebKit.

[Henrik Grunell, 2012/02/06 20:00:38]

Add a comment about the lifetime of |media_stream_center_| would be good. Or a
todo for this since this class isn't used yet. Is |media_stream_center_|
guaranteed to live longer than this?

[tommyw, 2012/02/07 09:26:25]

Done.

+  MediaStreamCenter* media_stream_center_;
+
   // We keep a list of the generated local tracks, so that we can add capture
   // devices when generated and also use them for recording.
   typedef talk_base::scoped_refptr<webrtc::MediaStreamTrackInterface>