Add a race-checking mechanism.

webrtc/modules/video_coding/generic_encoder.h

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #ifndef WEBRTC_MODULES_VIDEO_CODING_GENERIC_ENCODER_H_
 #define WEBRTC_MODULES_VIDEO_CODING_GENERIC_ENCODER_H_
 
 #include <stdio.h>
 #include <vector>
 
 #include "webrtc/modules/video_coding/include/video_codec_interface.h"
 #include "webrtc/modules/video_coding/include/video_coding_defines.h"
 
 #include "webrtc/base/criticalsection.h"
+#include "webrtc/base/race_checker.h"
 
 namespace webrtc {
 class CriticalSectionWrapper;
 
 namespace media_optimization {
 class MediaOptimization;
 }  // namespace media_optimization
 
 struct EncoderParameters {
   uint32_t target_bitrate;
@@ skipping 44 matching lines @@
   void SetEncoderParameters(const EncoderParameters& params);
   EncoderParameters GetEncoderParameters() const;
 
   int32_t SetPeriodicKeyFrames(bool enable);
   int32_t RequestFrame(const std::vector<FrameType>& frame_types);
   bool InternalSource() const;
   void OnDroppedFrame();
   bool SupportsNativeHandle() const;
 
  private:
-  VideoEncoder* const encoder_;
+  rtc::RaceChecker race_checker_;
+
+  VideoEncoder* const encoder_ GUARDED_BY(race_checker_);
   VideoEncoderRateObserver* const rate_observer_;
   VCMEncodedFrameCallback* const vcm_encoded_frame_callback_;
   const bool internal_source_;
   rtc::CriticalSection params_lock_;
   EncoderParameters encoder_params_ GUARDED_BY(params_lock_);
   bool is_screenshare_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_VIDEO_CODING_GENERIC_ENCODER_H_