Add more logging about the bwe state and VideoSendStream state.

webrtc/modules/congestion_controller/congestion_controller.cc

Index: webrtc/modules/congestion_controller/congestion_controller.cc
diff --git a/webrtc/modules/congestion_controller/congestion_controller.cc b/webrtc/modules/congestion_controller/congestion_controller.cc
index d42ad4acc513b702499ff5087a4cbba13712fbcf..1d3ac642acab9416c6f95098f387b4b75c3ffb56 100644
--- a/webrtc/modules/congestion_controller/congestion_controller.cc
+++ b/webrtc/modules/congestion_controller/congestion_controller.cc
@@ -277,6 +277,8 @@ int64_t CongestionController::GetPacerQueuingDelayMs() const {
 }
 
 void CongestionController::SignalNetworkState(NetworkState state) {
+  LOG(LS_INFO) << "SignalNetworkState "
+               << (state == kNetworkUp ? "Up" : "Down");
   if (state == kNetworkUp) {
     pacer_->Resume();
   } else {
@@ -340,6 +342,10 @@ bool CongestionController::HasNetworkParametersToReportChanged(
       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.";

[stefan-webrtc, 2016/07/06 14:21:32]

This will happen very often, right? Maybe it would be a good idea to rate limit
it?

[perkj_webrtc, 2016/07/06 14:30:06]

I don't think so. I  only want to log when the rate is set to = or set to !=0
There is a periodic log in BitrateAllocator.

[stefan-webrtc, 2016/07/06 14:33:57]

Ah, sorry, I misread.

+  }
   last_reported_bitrate_bps_ = bitrate_bps;
   last_reported_fraction_loss_ = fraction_loss;
   last_reported_rtt_ = rtt;