Add unit tests for webrtc_media_stream_adapter.cc

content/renderer/media/webrtc/media_stream_video_webrtc_sink.h

Index: content/renderer/media/webrtc/media_stream_video_webrtc_sink.h
diff --git a/content/renderer/media/webrtc/media_stream_video_webrtc_sink.h b/content/renderer/media/webrtc/media_stream_video_webrtc_sink.h
index fdd6233d4a39ff9dc6c7771d265ac03afc4b79d2..d881405b52232c62743b261fbd8945ab79049e20 100644
--- a/content/renderer/media/webrtc/media_stream_video_webrtc_sink.h
+++ b/content/renderer/media/webrtc/media_stream_video_webrtc_sink.h
@@ -27,7 +27,7 @@ class PeerConnectionDependencyFactory;
 // to an RTCPeerConnection object.
 // Instances of this class is owned by the WebRtcMediaStreamAdapter object that
 // created it.
-class MediaStreamVideoWebRtcSink : public MediaStreamVideoSink {
+class CONTENT_EXPORT MediaStreamVideoWebRtcSink : public MediaStreamVideoSink {
  public:
   MediaStreamVideoWebRtcSink(const blink::WebMediaStreamTrack& track,
                              PeerConnectionDependencyFactory* factory);
@@ -37,6 +37,8 @@ class MediaStreamVideoWebRtcSink : public MediaStreamVideoSink {
     return video_track_.get();
   }
 
+  rtc::Optional<bool> SourceNeedsDenoisingForTesting() const;
+
  protected:
   // Implementation of MediaStreamSink.
   void OnEnabledChanged(bool enabled) override;