Add a race-checking mechanism.

webrtc/common_video/include/incoming_video_stream.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_COMMON_VIDEO_INCLUDE_INCOMING_VIDEO_STREAM_H_
 #define WEBRTC_COMMON_VIDEO_INCLUDE_INCOMING_VIDEO_STREAM_H_
 
 #include <memory>
 
 #include "webrtc/base/criticalsection.h"
 #include "webrtc/base/platform_thread.h"
+#include "webrtc/base/race_checker.h"
 #include "webrtc/base/thread_annotations.h"
 #include "webrtc/base/thread_checker.h"
 #include "webrtc/common_video/video_render_frames.h"
 #include "webrtc/media/base/videosinkinterface.h"
 
 namespace webrtc {
 class EventTimerWrapper;
 
 class IncomingVideoStream : public rtc::VideoSinkInterface<VideoFrame> {
  public:
   IncomingVideoStream(int32_t delay_ms,
                       rtc::VideoSinkInterface<VideoFrame>* callback);
   ~IncomingVideoStream() override;
 
  protected:
   static bool IncomingVideoStreamThreadFun(void* obj);
   bool IncomingVideoStreamProcess();
 
  private:
   enum { kEventStartupTimeMs = 10 };
   enum { kEventMaxWaitTimeMs = 100 };
   enum { kFrameRatePeriodMs = 1000 };
 
   void OnFrame(const VideoFrame& video_frame) override;
 
   rtc::ThreadChecker main_thread_checker_;
   rtc::ThreadChecker render_thread_checker_;
+  rtc::RaceChecker decoder_race_checker_;
 
   rtc::CriticalSection buffer_critsect_;
   rtc::PlatformThread incoming_render_thread_;
   std::unique_ptr<EventTimerWrapper> deliver_buffer_event_;
 
   rtc::VideoSinkInterface<VideoFrame>* const external_callback_;
   std::unique_ptr<VideoRenderFrames> render_buffers_
       GUARDED_BY(buffer_critsect_);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_COMMON_VIDEO_INCLUDE_INCOMING_VIDEO_STREAM_H_