Change VideoTrack implementation to invoke VideoTrackSourceInterface::AddOrUpdateSink on wt

webrtc/pc/rtpreceiver.cc

 /*
  *  Copyright 2015 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 137 matching lines @@
       channel_(channel),
       source_(new RefCountedObject<VideoTrackSource>(&broadcaster_,
                                                      true /* remote */)),
       track_(VideoTrackProxy::Create(
           rtc::Thread::Current(),
           worker_thread,
           VideoTrack::Create(
               track_id,
               VideoTrackSourceProxy::Create(rtc::Thread::Current(),
                                             worker_thread,
-                                            source_)))) {
+                                            source_),
+              worker_thread))) {
   source_->SetState(MediaSourceInterface::kLive);
   if (!channel_) {
     LOG(LS_ERROR)
         << "VideoRtpReceiver::VideoRtpReceiver: No video channel exists.";
   } else {
     if (!channel_->SetSink(ssrc_, &broadcaster_)) {
       RTC_NOTREACHED();
     }
   }
   if (channel_) {
@@ skipping 64 matching lines @@
 }
 
 void VideoRtpReceiver::OnFirstPacketReceived(cricket::BaseChannel* channel) {
   if (observer_) {
     observer_->OnFirstPacketReceived(media_type());
   }
   received_first_packet_ = true;
 }
 
 }  // namespace webrtc