Wip - cl for implemening VideoTrackSource::ApplyConstraints(constraints, VideoTrack) and adopt safe…

content/renderer/media/user_media_client_impl.cc

Index: content/renderer/media/user_media_client_impl.cc
diff --git a/content/renderer/media/user_media_client_impl.cc b/content/renderer/media/user_media_client_impl.cc
index 10122a048a4468a368fd10747996b159811a8868..568c95b58f1ff69fc44f4b9374648a8abfb17d60 100644
--- a/content/renderer/media/user_media_client_impl.cc
+++ b/content/renderer/media/user_media_client_impl.cc
@@ -673,8 +673,8 @@ void UserMediaClientImpl::CreateVideoTracks(
                            blink::WebMediaStreamSource::TypeVideo,
                            constraints,
                            &webkit_source);
-    (*webkit_tracks)[i] =
-        request->CreateAndStartVideoTrack(webkit_source, constraints);
+    (*webkit_tracks)[i].initialize(webkit_source);
+    request->StartVideoTrack((*webkit_tracks)[i], constraints);
   }
 }
 
@@ -1110,21 +1110,23 @@ void UserMediaClientImpl::UserMediaRequestInfo::StartAudioTrack(
     OnTrackStarted(native_source, MEDIA_DEVICE_TRACK_START_FAILURE, "");
 }
 
-blink::WebMediaStreamTrack
-UserMediaClientImpl::UserMediaRequestInfo::CreateAndStartVideoTrack(
-    const blink::WebMediaStreamSource& source,
+void UserMediaClientImpl::UserMediaRequestInfo::StartVideoTrack(
+    const blink::WebMediaStreamTrack& track,
     const blink::WebMediaConstraints& constraints) {
-  DCHECK(source.getType() == blink::WebMediaStreamSource::TypeVideo);
+  DCHECK(track.source().getType() == blink::WebMediaStreamSource::TypeVideo);
   MediaStreamVideoSource* native_source =
-      MediaStreamVideoSource::GetVideoSource(source);
+      MediaStreamVideoSource::GetVideoSource(track.source());
+
   DCHECK(native_source);
-  sources_.push_back(source);
+  sources_.push_back(track.source());
   sources_waiting_for_callback_.push_back(native_source);
-  return MediaStreamVideoTrack::CreateVideoTrack(
-      native_source, constraints, base::Bind(
-          &UserMediaClientImpl::UserMediaRequestInfo::OnTrackStarted,
-          AsWeakPtr()),
-      true);
+  if (native_source->ConnectToTrack(track)) {
+    native_source->ApplyConstraints(track, constraints, base::Bind(
+        &UserMediaClientImpl::UserMediaRequestInfo::OnTrackStarted,
+        AsWeakPtr()));
+  } else {
+    OnTrackStarted(native_source, MEDIA_DEVICE_TRACK_START_FAILURE, "");
+  }
 }
 
 void UserMediaClientImpl::UserMediaRequestInfo::CallbackOnTracksStarted(