Wire up BWE stats through WebrtcSession so that they are filled in both for audio and video calls.

webrtc/pc/channel.cc

Index: webrtc/pc/channel.cc
diff --git a/webrtc/pc/channel.cc b/webrtc/pc/channel.cc
index f5428a43effac7a93fce554e11946c220946337c..d0025079e41082f04d8119f64a9ad3f13afff97b 100644
--- a/webrtc/pc/channel.cc
+++ b/webrtc/pc/channel.cc
@@ -1987,6 +1987,12 @@ void VideoChannel::UpdateMediaSendRecvState_w() {
   LOG(LS_INFO) << "Changing video state, send=" << send;
 }
 
+void VideoChannel::FillBitrateInfo(BandwidthEstimationInfo* bwe_info) {
+  RTC_DCHECK(InvokeOnWorker(

[Taylor Brandstetter, 2017/05/07 21:30:44]

Why is this in an RTC_DCHECK?

[stefan-webrtc, 2017/05/08 07:12:56]

Copy paste from below, but my method didn't have to return bool... Changed it
now to call worker_thread_->Invoke<void>() instead.

+      RTC_FROM_HERE,
+      Bind(&VideoMediaChannel::FillBitrateInfo, media_channel(), bwe_info)));
+}
+
 bool VideoChannel::GetStats(VideoMediaInfo* stats) {
   return InvokeOnWorker(RTC_FROM_HERE, Bind(&VideoMediaChannel::GetStats,
                                             media_channel(), stats));