Add unit tests for webrtc_media_stream_adapter.cc

content/renderer/media/webrtc/media_stream_video_webrtc_sink.cc

Index: content/renderer/media/webrtc/media_stream_video_webrtc_sink.cc
diff --git a/content/renderer/media/webrtc/media_stream_video_webrtc_sink.cc b/content/renderer/media/webrtc/media_stream_video_webrtc_sink.cc
index cafc3facc17b20a07f2a858b617bcd1dadbc1e37..99db0f2c3ee77976d518bb820a65e109f563d0d0 100644
--- a/content/renderer/media/webrtc/media_stream_video_webrtc_sink.cc
+++ b/content/renderer/media/webrtc/media_stream_video_webrtc_sink.cc
@@ -206,6 +206,7 @@ MediaStreamVideoWebRtcSink::MediaStreamVideoWebRtcSink(
     const blink::WebMediaStreamTrack& track,
     PeerConnectionDependencyFactory* factory)
     : weak_factory_(this) {
+  DCHECK(MediaStreamVideoTrack::GetVideoTrack(track));
   const blink::WebMediaConstraints& constraints =
       MediaStreamVideoTrack::GetVideoTrack(track)->constraints();
 
@@ -312,4 +313,9 @@ void MediaStreamVideoWebRtcSink::RequestRefreshFrame() {
   content::RequestRefreshFrameFromVideoTrack(connected_track());
 }
 
+rtc::Optional<bool> MediaStreamVideoWebRtcSink::SourceNeedsDenoisingForTesting()
+    const {
+  return video_source_->needs_denoising();
+}
+
 }  // namespace content