MediaStream Recorder: implement pause() and resume()

content/renderer/media/video_track_recorder.h

Index: content/renderer/media/video_track_recorder.h
diff --git a/content/renderer/media/video_track_recorder.h b/content/renderer/media/video_track_recorder.h
index 49b5cbe722fd0582fd3084027a991276fac108a9..c5c31b5996bea32ae3bddd8b84ba5bb3f5024cd0 100644
--- a/content/renderer/media/video_track_recorder.h
+++ b/content/renderer/media/video_track_recorder.h
@@ -38,9 +38,11 @@ class CONTENT_EXPORT VideoTrackRecorder
                      const OnEncodedVideoCB& on_encoded_video_cb);
   ~VideoTrackRecorder() override;
 
+  void Pause();
+  void Resume();
+
   void OnVideoFrameForTesting(const scoped_refptr<media::VideoFrame>& frame,
                               base::TimeTicks capture_time);
-
  private:
   friend class VideoTrackRecorderTest;