Let ViEEncoder express resolution requests as Sinkwants

webrtc/test/frame_generator.h

Index: webrtc/test/frame_generator.h
diff --git a/webrtc/test/frame_generator.h b/webrtc/test/frame_generator.h
index e7cba1c4efaefb60596ab0059d37663ef76ffae4..7d849c91e6042f69a8564f6c02933c853213c2df 100644
--- a/webrtc/test/frame_generator.h
+++ b/webrtc/test/frame_generator.h
@@ -31,6 +31,8 @@ class FrameForwarder : public rtc::VideoSourceInterface<VideoFrame> {
   FrameForwarder();
   // Forwards |video_frame| to the registered |sink_|.
   void IncomingCapturedFrame(const VideoFrame& video_frame);
+  rtc::VideoSinkWants current_sink_wants() const;
+  bool has_sinks() const;
 
  private:
   void AddOrUpdateSink(rtc::VideoSinkInterface<VideoFrame>* sink,
@@ -39,6 +41,7 @@ class FrameForwarder : public rtc::VideoSourceInterface<VideoFrame> {
 
   rtc::CriticalSection crit_;
   rtc::VideoSinkInterface<VideoFrame>* sink_ GUARDED_BY(crit_);
+  rtc::VideoSinkWants sink_wants_ GUARDED_BY(crit_);
 };
 
 class FrameGenerator {