Cast: deliver video frames on the IO thread

content/renderer/media/webrtc/webrtc_video_track_adapter.cc

 // Copyright 2014 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/renderer/media/webrtc/webrtc_video_track_adapter.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "content/common/media/media_stream_options.h"
 #include "content/renderer/media/media_stream_video_source.h"
 #include "content/renderer/media/media_stream_video_track.h"
@@ skipping 71 matching lines @@
                                  track.source().constraints()));
 
   video_track_ = factory->CreateLocalVideoTrack(web_track_.id().utf8(),
                                                 video_source.get());
 
   video_track_->set_enabled(web_track_.isEnabled());
 
   source_adapter_ = new WebRtcVideoSourceAdapter(video_source,
                                                  capture_adapter);
 
-  MediaStreamVideoTrack::GetVideoTrack(track)->AddSink(
-      this, base::Bind(&WebRtcVideoSourceAdapter::OnVideoFrameOnIO,
-                       source_adapter_));
+  AddToVideoTrack(
+      this,
+      base::Bind(&WebRtcVideoSourceAdapter::OnVideoFrameOnIO,
+                 source_adapter_),
+      web_track_);
 
   DVLOG(3) << "WebRtcVideoTrackAdapter ctor() : is_screencast "
            << is_screencast;
 }
 
 WebRtcVideoTrackAdapter::~WebRtcVideoTrackAdapter() {
   DCHECK(thread_checker_.CalledOnValidThread());
   DVLOG(3) << "WebRtcVideoTrackAdapter dtor().";
-  MediaStreamVideoTrack::GetVideoTrack(web_track_)->RemoveSink(this);
+  RemoveFromVideoTrack(this, web_track_);
 }
 
 void WebRtcVideoTrackAdapter::OnEnabledChanged(bool enabled) {
   DCHECK(thread_checker_.CalledOnValidThread());
   video_track_->set_enabled(enabled);
 }
 
 }  // namespace content
-