Wire-up BWE feedback for audio receive streams.

webrtc/call/congestion_controller.cc

 /*
  *  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.
  */
 
@@ skipping 151 matching lines @@
                                    packet_router_.get())),
       process_thread_(process_thread),
       call_stats_(call_stats),
       pacer_thread_(ProcessThread::Create("PacerThread")),
       // Constructed last as this object calls the provided callback on
       // construction.
       bitrate_controller_(
           BitrateController::CreateBitrateController(Clock::GetRealTimeClock(),
                                                      bitrate_observer)),
       min_bitrate_bps_(RemoteBitrateEstimator::kDefaultMinBitrateBps) {
+  RTC_DCHECK(bitrate_observer);

[mflodman, 2016/01/12 12:42:53]

I don't this check makes sense here, since it's not used in this class. Either
remove or move to BitrateController.

[stefan-webrtc, 2016/01/12 12:53:18]

I'll remove it for now.

   call_stats_->RegisterStatsObserver(remote_bitrate_estimator_.get());
 
   pacer_thread_->RegisterModule(pacer_.get());
   pacer_thread_->Start();
 
   process_thread->RegisterModule(remote_estimator_proxy_.get());
   process_thread->RegisterModule(remote_bitrate_estimator_.get());
   process_thread->RegisterModule(bitrate_controller_.get());
 }
 
@@ skipping 103 matching lines @@
   }
 }
 
 void CongestionController::OnSentPacket(const rtc::SentPacket& sent_packet) {
   if (transport_feedback_adapter_) {
     transport_feedback_adapter_->OnSentPacket(sent_packet.packet_id,
                                               sent_packet.send_time_ms);
   }
 }
 }  // namespace webrtc