Add video frame refresh to MediaStream and VideoCapture stacks.

content/renderer/media/video_capture_impl_manager.h

Index: content/renderer/media/video_capture_impl_manager.h
diff --git a/content/renderer/media/video_capture_impl_manager.h b/content/renderer/media/video_capture_impl_manager.h
index ef1a16889a7652e47a5822b06e9b41d92a5b410c..c6f9b90b87e9d8136154079ca2ce837eb347b32f 100644
--- a/content/renderer/media/video_capture_impl_manager.h
+++ b/content/renderer/media/video_capture_impl_manager.h
@@ -73,6 +73,10 @@ class CONTENT_EXPORT VideoCaptureImplManager {
       const VideoCaptureStateUpdateCB& state_update_cb,
       const VideoCaptureDeliverFrameCB& deliver_frame_cb);
 
+  // Requests that the video capturer send a frame "soon" (e.g., to resolve
+  // picture loss or quality issues).
+  void RequestRefreshFrame(media::VideoCaptureSessionId id);
+
   // Get supported formats supported by the device for the given session
   // ID. |callback| will be called on the IO thread.
   void GetDeviceSupportedFormats(media::VideoCaptureSessionId id,