Add more logging about the bwe state and VideoSendStream state.

webrtc/modules/congestion_controller/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 259 matching lines @@
     int min_send_bitrate_bps,
     int max_padding_bitrate_bps) {
   pacer_->SetSendBitrateLimits(min_send_bitrate_bps, max_padding_bitrate_bps);
 }
 
 int64_t CongestionController::GetPacerQueuingDelayMs() const {
   return pacer_->QueueInMs();
 }
 
 void CongestionController::SignalNetworkState(NetworkState state) {
+  LOG(LS_INFO) << "SignalNetworkState "
+               << (state == kNetworkUp ? "Up" : "Down");
   if (state == kNetworkUp) {
     pacer_->Resume();
   } else {
     pacer_->Pause();
   }
   {
     rtc::CritScope cs(&critsect_);
     network_state_ = state;
   }
   MaybeTriggerOnNetworkChanged();
@@ skipping 43 matching lines @@
 
 bool CongestionController::HasNetworkParametersToReportChanged(
     uint32_t bitrate_bps,
     uint8_t fraction_loss,
     int64_t rtt) {
   rtc::CritScope cs(&critsect_);
   bool changed =
       last_reported_bitrate_bps_ != bitrate_bps ||
       (bitrate_bps > 0 && (last_reported_fraction_loss_ != fraction_loss ||
                            last_reported_rtt_ != rtt));
+  if (changed && (last_reported_bitrate_bps_ == 0 || bitrate_bps == 0)) {
+    LOG(LS_INFO) << "Bitrate estimate state changed, BWE: " << bitrate_bps
+                 << " bps.";
+  }
   last_reported_bitrate_bps_ = bitrate_bps;
   last_reported_fraction_loss_ = fraction_loss;
   last_reported_rtt_ = rtt;
   return changed;
 }
 
 bool CongestionController::IsSendQueueFull() const {
   return pacer_->ExpectedQueueTimeMs() > PacedSender::kMaxQueueLengthMs;
 }
 
 bool CongestionController::IsNetworkDown() const {
   rtc::CritScope cs(&critsect_);
   return network_state_ == kNetworkDown;
 }
 
 }  // namespace webrtc