VideoTrackAdapter: Add passing frames monitor, notify MSVCS -> MSVTrack(s)

content/renderer/media/media_stream_track.h

Index: content/renderer/media/media_stream_track.h
diff --git a/content/renderer/media/media_stream_track.h b/content/renderer/media/media_stream_track.h
index 456005d4d054284e2a999187c5375c171a468369..c50500dae08c5c0d9c81e9f4872be3cc21b508e2 100644
--- a/content/renderer/media/media_stream_track.h
+++ b/content/renderer/media/media_stream_track.h
@@ -34,6 +34,8 @@ class CONTENT_EXPORT MediaStreamTrack
   // If a subclass overrides this method it has to call the base class.
   virtual void SetEnabled(bool enabled);
 
+  virtual void SetMutedState(bool muted_state);
+
   // TODO(xians): Make this pure virtual when Stop[Track] has been
   // implemented for remote audio tracks.
   virtual void Stop();
@@ -45,6 +47,9 @@ class CONTENT_EXPORT MediaStreamTrack
  protected:
   scoped_refptr<webrtc::MediaStreamTrackInterface> track_;
 
+  // The source can put this attribute to true if it's not delivering frames.

[Henrik Grunell, 2014/07/08 11:39:53]

I think it should say "This will be set to true if the source is not delivering
frames." Or which source class are you referring to? Maybe that should be in the
comment?

[mcasas, 2014/07/08 16:12:01]

source -> MediaStreamSource.
Rewritten.

+  bool muted_state_;
+
  private:
   const bool is_local_track_;