Add video frame refresh to MediaStream and VideoCapture stacks.

content/renderer/media/video_capture_impl.cc

Index: content/renderer/media/video_capture_impl.cc
diff --git a/content/renderer/media/video_capture_impl.cc b/content/renderer/media/video_capture_impl.cc
index bef9f3bed21c3449866510cb4b8dc5e7a9ba31e5..9463bba333d1a43395d624cecca476430495c174 100644
--- a/content/renderer/media/video_capture_impl.cc
+++ b/content/renderer/media/video_capture_impl.cc
@@ -217,6 +217,11 @@ void VideoCaptureImpl::StopCapture(int client_id) {
   }
 }
 
+void VideoCaptureImpl::RequestRefreshFrame() {
+  DCHECK(io_task_runner_->BelongsToCurrentThread());
+  Send(new VideoCaptureHostMsg_RequestRefreshFrame(device_id_));
+}
+
 void VideoCaptureImpl::GetDeviceSupportedFormats(
     const VideoCaptureDeviceFormatsCB& callback) {
   DCHECK(io_task_runner_->BelongsToCurrentThread());