Reland of Change VideoTrack implementation to invoke VideoTrackSourceInterface::AddOrUpdateSink on …

webrtc/ortc/ortcfactory.cc

Index: webrtc/ortc/ortcfactory.cc
diff --git a/webrtc/ortc/ortcfactory.cc b/webrtc/ortc/ortcfactory.cc
index 1d968738cd7368af3b24f72b32c7be7bfe448658..be1c4c7a76c8ce60c776af006875ad23a4d54cb5 100644
--- a/webrtc/ortc/ortcfactory.cc
+++ b/webrtc/ortc/ortcfactory.cc
@@ -479,7 +479,8 @@ rtc::scoped_refptr<VideoTrackInterface> OrtcFactory::CreateVideoTrack(
     const std::string& id,
     VideoTrackSourceInterface* source) {
   RTC_DCHECK_RUN_ON(signaling_thread_);
-  rtc::scoped_refptr<VideoTrackInterface> track(VideoTrack::Create(id, source));
+  rtc::scoped_refptr<VideoTrackInterface> track(
+      VideoTrack::Create(id, source, worker_thread_.get()));
   return VideoTrackProxy::Create(signaling_thread_, worker_thread_.get(),
                                  track);
 }