Add video frame refresh to MediaStream and VideoCapture stacks.

content/public/renderer/media_stream_utils.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/public/renderer/media_stream_utils.h"
 
 #include <utility>
 
 #include "base/callback.h"
 #include "base/guid.h"
@@ skipping 100 matching lines @@
 
   web_media_stream->addTrack(web_media_stream_track);
   return true;
 }
 
 const media::VideoCaptureFormat* GetCurrentVideoTrackFormat(
     const blink::WebMediaStreamTrack& video_track) {
   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