Make sure VideoReceiveStream can be restarted

webrtc/video/video_receive_stream.h

 /*
  *  Copyright (c) 2013 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.
  */
 
@@ skipping 80 matching lines @@
   // the log is closed and finalized. A |byte_limit| of 0 means no limit.
   void EnableEncodedFrameRecording(rtc::PlatformFile file,
                                    size_t byte_limit) override;
 
  private:
   static bool DecodeThreadFunction(void* ptr);
   void Decode();
 
   TransportAdapter transport_adapter_;
   const VideoReceiveStream::Config config_;
+  const int num_cpu_cores_;
   ProcessThread* const process_thread_;
   Clock* const clock_;
 
   rtc::PlatformThread decode_thread_;
 
   CongestionController* const congestion_controller_;
   CallStats* const call_stats_;
 
   vcm::VideoReceiver video_receiver_;
   std::unique_ptr<rtc::VideoSinkInterface<VideoFrame>> incoming_video_stream_;
   ReceiveStatisticsProxy stats_proxy_;
   RtpStreamReceiver rtp_stream_receiver_;
   std::unique_ptr<VideoStreamDecoder> video_stream_decoder_;
   RtpStreamsSynchronizer rtp_stream_sync_;
 
   rtc::CriticalSection ivf_writer_lock_;
   std::unique_ptr<IvfFileWriter> ivf_writer_ GUARDED_BY(ivf_writer_lock_);
 };
 }  // namespace internal
 }  // namespace webrtc
 
 #endif  // WEBRTC_VIDEO_VIDEO_RECEIVE_STREAM_H_