Add framerate to VideoSinkWants and ability to signal on overuse

webrtc/video_send_stream.h

Index: webrtc/video_send_stream.h
diff --git a/webrtc/video_send_stream.h b/webrtc/video_send_stream.h
index 680eb02bc46805ae701342faabd54a81d3581f87..287d5a072f570438ac4105a2eb4123fc431f84a3 100644
--- a/webrtc/video_send_stream.h
+++ b/webrtc/video_send_stream.h
@@ -220,6 +220,7 @@ class VideoSendStream {
     // if the encoder overshoots or the encoder can not encode fast enough.
     kBalanced,
   };
+
   virtual void SetSource(
       rtc::VideoSourceInterface<webrtc::VideoFrame>* source,
       const DegradationPreference& degradation_preference) = 0;