Add framerate to VideoSinkWants and ability to signal on overuse

webrtc/test/frame_generator_capturer.h

Index: webrtc/test/frame_generator_capturer.h
diff --git a/webrtc/test/frame_generator_capturer.h b/webrtc/test/frame_generator_capturer.h
index dfd12711d187988560178bc90082b1e4788d472f..3d65c63dc5784ba88a477ecb8536aa618716634a 100644
--- a/webrtc/test/frame_generator_capturer.h
+++ b/webrtc/test/frame_generator_capturer.h
@@ -19,6 +19,10 @@
 #include "webrtc/test/video_capturer.h"
 #include "webrtc/typedefs.h"
 
+namespace cricket {
+class VideoAdapter;
+}  // namespace cricket
+
 namespace webrtc {
 
 class CriticalSectionWrapper;
@@ -86,8 +90,10 @@ class FrameGeneratorCapturer : public VideoCapturer {
   rtc::CriticalSection lock_;
   rtc::PlatformThread thread_;
   std::unique_ptr<FrameGenerator> frame_generator_;
+  std::unique_ptr<cricket::VideoAdapter> video_adpter_;
 
-  int target_fps_;
+  int target_fps_ GUARDED_BY(&lock_);
+  rtc::Optional<int> wanted_fps_ GUARDED_BY(&lock_);
   VideoRotation fake_rotation_ = kVideoRotation_0;
 
   int64_t first_frame_capture_time_;