Let Call register ReceiveSideCongestionController as CallStatsObserver.

webrtc/call/call.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 374 matching lines @@
     RTC_DCHECK_GE(config.bitrate_config.max_bitrate_bps,
                   config.bitrate_config.start_bitrate_bps);
   }
   Trace::CreateTrace();
   transport_send_->InitCongestionControl(this);
   transport_send_->send_side_cc()->SignalNetworkState(kNetworkDown);
   transport_send_->send_side_cc()->SetBweBitrates(
       config_.bitrate_config.min_bitrate_bps,
       config_.bitrate_config.start_bitrate_bps,
       config_.bitrate_config.max_bitrate_bps);
+  call_stats_->RegisterStatsObserver(&receive_side_cc_);
   call_stats_->RegisterStatsObserver(transport_send_->send_side_cc());
 
   module_process_thread_->Start();
   module_process_thread_->RegisterModule(call_stats_.get(), RTC_FROM_HERE);
   module_process_thread_->RegisterModule(&receive_side_cc_, RTC_FROM_HERE);
   module_process_thread_->RegisterModule(transport_send_->send_side_cc(),
                                          RTC_FROM_HERE);
   pacer_thread_->RegisterModule(transport_send_->send_side_cc()->pacer(),
                                 RTC_FROM_HERE);
   pacer_thread_->RegisterModule(
@@ skipping 14 matching lines @@
   RTC_CHECK(video_receive_streams_.empty());
 
   pacer_thread_->Stop();
   pacer_thread_->DeRegisterModule(transport_send_->send_side_cc()->pacer());
   pacer_thread_->DeRegisterModule(
       receive_side_cc_.GetRemoteBitrateEstimator(true));
   module_process_thread_->DeRegisterModule(transport_send_->send_side_cc());
   module_process_thread_->DeRegisterModule(&receive_side_cc_);
   module_process_thread_->DeRegisterModule(call_stats_.get());
   module_process_thread_->Stop();
+  call_stats_->DeregisterStatsObserver(&receive_side_cc_);
   call_stats_->DeregisterStatsObserver(transport_send_->send_side_cc());
 
   // Only update histograms after process threads have been shut down, so that
   // they won't try to concurrently update stats.
   {
     rtc::CritScope lock(&bitrate_crit_);
     UpdateSendHistograms();
   }
   UpdateReceiveHistograms();
   UpdateHistograms();
@@ skipping 886 matching lines @@
       (use_send_side_bwe && header.extension.hasTransportSequenceNumber)) {
     receive_side_cc_.OnReceivedPacket(
         packet.arrival_time_ms(), packet.payload_size() + packet.padding_size(),
         header);
   }
 }
 
 }  // namespace internal
 
 }  // namespace webrtc