Add video frame refresh to MediaStream and VideoCapture stacks.

content/renderer/media/media_stream_video_capturer_source.cc

Index: content/renderer/media/media_stream_video_capturer_source.cc
diff --git a/content/renderer/media/media_stream_video_capturer_source.cc b/content/renderer/media/media_stream_video_capturer_source.cc
index 405e26a6c58b82d0b1ecad3a032e087c70e259ff..b4805c7385a61930497b3c21ae72b92194236f75 100644
--- a/content/renderer/media/media_stream_video_capturer_source.cc
+++ b/content/renderer/media/media_stream_video_capturer_source.cc
@@ -210,6 +210,7 @@ class LocalVideoCapturerSource final : public media::VideoCapturerSource {
   void StartCapture(const media::VideoCaptureParams& params,
                     const VideoCaptureDeliverFrameCB& new_frame_callback,
                     const RunningCallback& running_callback) override;
+  void RequestRefreshFrame() override;
   void StopCapture() override;
 
  private:
@@ -309,6 +310,15 @@ void LocalVideoCapturerSource::StartCapture(
       new_frame_callback);
 }
 
+void LocalVideoCapturerSource::RequestRefreshFrame() {
+  DVLOG(3) << __FUNCTION__;
+  DCHECK(thread_checker_.CalledOnValidThread());
+  if (stop_capture_cb_.is_null())
+    return;  // Do not request frames if the source is stopped.
+  manager_->RequestRefreshFrame(session_id_);
+}
+
+
 void LocalVideoCapturerSource::StopCapture() {
   DVLOG(3) << __FUNCTION__;
   DCHECK(thread_checker_.CalledOnValidThread());