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

content/renderer/media/mock_media_stream_video_source.h

Index: content/renderer/media/mock_media_stream_video_source.h
diff --git a/content/renderer/media/mock_media_stream_video_source.h b/content/renderer/media/mock_media_stream_video_source.h
index ad7463b6d4c74e516ecd8684ca002da2d9af2836..0786798789c042fa3f3d6ed405f4a9676bdc0e06 100644
--- a/content/renderer/media/mock_media_stream_video_source.h
+++ b/content/renderer/media/mock_media_stream_video_source.h
@@ -7,6 +7,8 @@
 
 #include "content/renderer/media/media_stream_video_source.h"
 
+#include "testing/gmock/include/gmock/gmock.h"
+
 namespace content {
 
 class MockMediaStreamVideoSource : public MediaStreamVideoSource {
@@ -14,6 +16,8 @@ class MockMediaStreamVideoSource : public MediaStreamVideoSource {
   explicit MockMediaStreamVideoSource(bool manual_get_supported_formats);
   virtual ~MockMediaStreamVideoSource();
 
+  MOCK_METHOD1(DoSetMutedState, void(bool muted_state));
+
   // Simulate that the underlying source start successfully.
   void StartMockedSource();
 
@@ -39,6 +43,11 @@ class MockMediaStreamVideoSource : public MediaStreamVideoSource {
   int max_requested_height() const { return max_requested_height_; }
   int max_requested_width() const { return max_requested_width_; }
 
+  void SetMutedState(bool muted_state) {
+    MediaStreamVideoSource::SetMutedState(muted_state);
+    DoSetMutedState(muted_state);
+  }
+
  protected:
   void DeliverVideoFrameOnIO(const scoped_refptr<media::VideoFrame>& frame,
                              media::VideoCaptureFormat format,