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

webrtc/pc/peerconnectioninterface_unittest.cc

Index: webrtc/pc/peerconnectioninterface_unittest.cc
diff --git a/webrtc/pc/peerconnectioninterface_unittest.cc b/webrtc/pc/peerconnectioninterface_unittest.cc
index 114ffd75e215206d7df47aaf0fb14bd45565689c..0e52c200d4df088ab0a37f4d5054294513f87c34 100644
--- a/webrtc/pc/peerconnectioninterface_unittest.cc
+++ b/webrtc/pc/peerconnectioninterface_unittest.cc
@@ -460,7 +460,8 @@ rtc::scoped_refptr<StreamCollection> CreateStreamCollection(
       // Add a local video track.
       rtc::scoped_refptr<webrtc::VideoTrackInterface> video_track(
           webrtc::VideoTrack::Create(kVideoTracks[i * tracks_per_stream + j],
-                                     webrtc::FakeVideoTrackSource::Create()));
+                                     webrtc::FakeVideoTrackSource::Create(),
+                                     rtc::Thread::Current()));
       stream->AddTrack(video_track);
     }
 
@@ -1150,7 +1151,8 @@ class PeerConnectionInterfaceTest : public testing::Test {
                      MediaStreamInterface* stream) {
     rtc::scoped_refptr<webrtc::VideoTrackInterface> video_track(
         webrtc::VideoTrack::Create(track_id,
-                                   webrtc::FakeVideoTrackSource::Create()));
+                                   webrtc::FakeVideoTrackSource::Create(),
+                                   rtc::Thread::Current()));
     ASSERT_TRUE(stream->AddTrack(video_track));
   }