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

content/renderer/media/media_stream_track.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_MEDIA_MEDIA_STREAM_TRACK_EXTRA_DATA_H_
 #define CONTENT_RENDERER_MEDIA_MEDIA_STREAM_TRACK_EXTRA_DATA_H_
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
@@ skipping 16 matching lines @@
   MediaStreamTrack(webrtc::MediaStreamTrackInterface* track,
                    bool is_local_track);
   virtual ~MediaStreamTrack();
 
   static MediaStreamTrack* GetTrack(
       const blink::WebMediaStreamTrack& track);
 
   // 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();
 
   virtual webrtc::AudioTrackInterface* GetAudioAdapter();
 
   bool is_local_track () const { return is_local_track_; }
 
  protected:
   scoped_refptr<webrtc::MediaStreamTrackInterface> track_;
 
+  // Set to true if the owner MediaStreamSource is not delivering frames.
+  bool muted_state_;
+
  private:
   const bool is_local_track_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaStreamTrack);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_TRACK_EXTRA_DATA_H_