Change OverUseFrameDetector to use a task queue

webrtc/video/vie_encoder.h

Index: webrtc/video/vie_encoder.h
diff --git a/webrtc/video/vie_encoder.h b/webrtc/video/vie_encoder.h
index 42fe03b18856a5834644ff8ca342ec1556ba349b..a2a0cd960e84546a36ab6c503e713488c99b9828 100644
--- a/webrtc/video/vie_encoder.h
+++ b/webrtc/video/vie_encoder.h
@@ -102,7 +102,8 @@ class ViEEncoder : public VideoCaptureInput,
                       uint32_t frame_rate,
                       const std::string& encoder_name) override;
 
-  void EncodeVideoFrame(const VideoFrame& frame);
+  void EncodeVideoFrame(const VideoFrame& frame,
+                        int64_t time_when_posted_in_ms);
 
   // Implements EncodedImageCallback.
   EncodedImageCallback::Result OnEncodedImage(
@@ -126,8 +127,9 @@ class ViEEncoder : public VideoCaptureInput,
 
   const std::unique_ptr<VideoProcessing> vp_;
   vcm::VideoSender video_sender_ ACCESS_ON(&encoder_queue_);
-  OveruseFrameDetector overuse_detector_;
-  LoadObserver* const load_observer_ ACCESS_ON(&module_process_thread_checker_);
+
+  OveruseFrameDetector overuse_detector_ ACCESS_ON(&encoder_queue_);
+  LoadObserver* const load_observer_ ACCESS_ON(&encoder_queue_);
 
   SendStatisticsProxy* const stats_proxy_;
   rtc::VideoSinkInterface<VideoFrame>* const pre_encode_callback_;