Start documenting the threading model

webrtc/modules/video_coding/video_receiver.cc

 /*
  *  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 340 matching lines @@
     request_key_frame = true;
     ret = VCM_OK;
   }
   if (request_key_frame) {
     rtc::CritScope cs(&process_crit_);
     _scheduleKeyRequest = true;
   }
   return ret;
 }
 
+void VideoReceiver::PollDecodedFrames() {
+  if (_decoder)
+    _decoder->PollDecodedFrames();
+}
+
 // Register possible receive codecs, can be called multiple times
 int32_t VideoReceiver::RegisterReceiveCodec(const VideoCodec* receiveCodec,
                                             int32_t numberOfCores,
                                             bool requireKeyFrame) {
   rtc::CritScope cs(&receive_crit_);
   if (receiveCodec == nullptr) {
     return VCM_PARAMETER_ERROR;
   }
   if (!_codecDataBase.RegisterReceiveCodec(receiveCodec, numberOfCores,
                                            requireKeyFrame)) {
@@ skipping 125 matching lines @@
   _receiver.SetNackSettings(max_nack_list_size, max_packet_age_to_nack,
                             max_incomplete_time_ms);
 }
 
 int VideoReceiver::SetMinReceiverDelay(int desired_delay_ms) {
   return _receiver.SetMinReceiverDelay(desired_delay_ms);
 }
 
 }  // namespace vcm
 }  // namespace webrtc