Change VideoTrack implementation to invoke VideoTrackSourceInterface::AddOrUpdateSink on wt

webrtc/pc/peerconnectionfactory.cc

Index: webrtc/pc/peerconnectionfactory.cc
diff --git a/webrtc/pc/peerconnectionfactory.cc b/webrtc/pc/peerconnectionfactory.cc
index 77e6f2c272582cc988416f2a801f8011ed34c765..3c1d55795ce9d785d6ed8960de2398a5e2ae371d 100644
--- a/webrtc/pc/peerconnectionfactory.cc
+++ b/webrtc/pc/peerconnectionfactory.cc
@@ -342,7 +342,7 @@ rtc::scoped_refptr<VideoTrackInterface> PeerConnectionFactory::CreateVideoTrack(
     VideoTrackSourceInterface* source) {
   RTC_DCHECK(signaling_thread_->IsCurrent());
   rtc::scoped_refptr<VideoTrackInterface> track(
-      VideoTrack::Create(id, source));
+      VideoTrack::Create(id, source, worker_thread_));
   return VideoTrackProxy::Create(signaling_thread_, worker_thread_, track);
 }