Request frame for new sinks from MediaStreamVideoTrack

content/renderer/media/canvas_capture_handler.h

Index: content/renderer/media/canvas_capture_handler.h
diff --git a/content/renderer/media/canvas_capture_handler.h b/content/renderer/media/canvas_capture_handler.h
index dff93b41e1b550716c82a7dff2bde9ef700c5bd2..38a950dbe4e7453d55f4830cddddbe87c22dc9ac 100644
--- a/content/renderer/media/canvas_capture_handler.h
+++ b/content/renderer/media/canvas_capture_handler.h
@@ -53,6 +53,7 @@ class CONTENT_EXPORT CanvasCaptureHandler final
       const media::VideoCapturerSource::VideoCaptureDeliverFrameCB&
           new_frame_callback,
       const media::VideoCapturerSource::RunningCallback& running_callback);
+  void RequestLastFrame();
   void StopVideoCapture();
   blink::WebSize GetSourceSize() const { return size_; }
 
@@ -86,6 +87,9 @@ class CONTENT_EXPORT CanvasCaptureHandler final
   SkImageInfo image_info_;
   media::VideoFramePool frame_pool_;
 
+  scoped_refptr<media::VideoFrame> last_frame_;
+  base::TimeTicks last_frame_estimated_capture_time_;
+
   const scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
   scoped_ptr<CanvasCaptureHandlerDelegate> delegate_;