Adding a skeleton MediaStreamCenter.

content/renderer/render_view_impl.h

Index: content/renderer/render_view_impl.h
diff --git a/content/renderer/render_view_impl.h b/content/renderer/render_view_impl.h
index bb88d794af9babe8c9fce4a673ac80465d485c86..210c7c6934a4d6200d242c2688bf615f33c7df02 100644
--- a/content/renderer/render_view_impl.h
+++ b/content/renderer/render_view_impl.h
@@ -122,6 +122,8 @@ class WebIconURL;
 class WebImage;
 class WebMediaPlayer;
 class WebMediaPlayerClient;
+class WebMediaStreamCenter;
+class WebMediaStreamCenterClient;
 class WebMouseEvent;
 class WebPeerConnectionHandler;
 class WebPeerConnectionHandlerClient;
@@ -226,6 +228,12 @@ class RenderViewImpl : public RenderWidget,
   WebKit::WebPeerConnectionHandler* CreatePeerConnectionHandler(
       WebKit::WebPeerConnectionHandlerClient* client);
 
+  // Creates the embedder implementation of WebMediaStreamCenter.
+  // Only one is created per frame.
+  // The resulting object is owned by WebKit and released at tear-down.
+  WebKit::WebMediaStreamCenter* CreateMediaStreamCenter(
+      WebKit::WebMediaStreamCenterClient* client);
+
   // Functions to add and remove observers for this object.
   void AddObserver(content::RenderViewObserver* observer);
   void RemoveObserver(content::RenderViewObserver* observer);