Add video frame refresh to MediaStream and VideoCapture stacks.

content/public/renderer/media_stream_utils.cc

Index: content/public/renderer/media_stream_utils.cc
diff --git a/content/public/renderer/media_stream_utils.cc b/content/public/renderer/media_stream_utils.cc
index d48654198205e8d6245df9e7b643e2bfab633d01..5b91b182531ba31585bba93627838e2b6c07be9c 100644
--- a/content/public/renderer/media_stream_utils.cc
+++ b/content/public/renderer/media_stream_utils.cc
@@ -118,12 +118,22 @@ const media::VideoCaptureFormat* GetCurrentVideoTrackFormat(
   if (video_track.isNull())
     return nullptr;
 
-  content::MediaStreamVideoSource* source =
-      content::MediaStreamVideoSource::GetVideoSource(video_track.source());
+  MediaStreamVideoSource* const source =
+      MediaStreamVideoSource::GetVideoSource(video_track.source());
   if (!source)
     return nullptr;
 
   return source->GetCurrentFormat();
 }
 
+void RequestRefreshFrameFromVideoTrack(
+    const blink::WebMediaStreamTrack& video_track) {
+  if (video_track.isNull())
+    return;
+  MediaStreamVideoSource* const source =
+      MediaStreamVideoSource::GetVideoSource(video_track.source());
+  if (source)
+    source->RequestRefreshFrame();
+}
+
 }  // namespace content