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

content/renderer/media/media_stream_video_source.h

Index: content/renderer/media/media_stream_video_source.h
diff --git a/content/renderer/media/media_stream_video_source.h b/content/renderer/media/media_stream_video_source.h
index 45d2b03082db635b30a1e0d697ef56b3f16d4d91..cf4160c83f2c307bb4e2c5546cafe805e6b2d891 100644
--- a/content/renderer/media/media_stream_video_source.h
+++ b/content/renderer/media/media_stream_video_source.h
@@ -88,6 +88,9 @@ class CONTENT_EXPORT MediaStreamVideoSource
   // Sets ready state and notifies the ready state to all registered tracks.
   virtual void SetReadyState(blink::WebMediaStreamSource::ReadyState state);
 
+  // Sets muted state and notifies it to all registered tracks.
+  virtual void SetMutedState(bool state);
+
   // An implementation must fetch the formats that can currently be used by
   // the source and call OnSupportedFormats when done.
   // |max_requested_height| and |max_requested_width| is the max height and
@@ -144,6 +147,7 @@ class CONTENT_EXPORT MediaStreamVideoSource
   void FinalizeAddTrack();
 
   State state_;
+  bool muted_state_;
 
   media::VideoCaptureFormat current_format_;