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

webrtc/pc/webrtcsession.cc

Index: webrtc/pc/webrtcsession.cc
diff --git a/webrtc/pc/webrtcsession.cc b/webrtc/pc/webrtcsession.cc
index cc424b222e081c994b6a7e546f59c126d86a7c01..47c046a4d1810cf433ed3be88f173960d5577224 100644
--- a/webrtc/pc/webrtcsession.cc
+++ b/webrtc/pc/webrtcsession.cc
@@ -1895,6 +1895,17 @@ bool WebRtcSession::CreateDataChannel(const cricket::ContentInfo* content,
   return true;
 }
 
+Call::Stats WebRtcSession::GetCallStats() {
+  RTC_DCHECK(network_thread()->IsCurrent());
+  return call_->GetStats();
+}
+
+Call::Stats WebRtcSession::GetCallStats_s() {
+  RTC_DCHECK(signaling_thread()->IsCurrent());
+  return network_thread()->Invoke<Call::Stats>(
+      RTC_FROM_HERE, rtc::Bind(&WebRtcSession::GetCallStats, this));

[Taylor Brandstetter, 2017/05/31 00:03:51]

Would "rtc::Bind(&Call::GetStats, call_)" work?

[hbos, 2017/05/31 14:31:58]

Yes but if GetCallStats is ever updated you'd have to remember to update two
methods instead of one.

+}
+
 std::unique_ptr<SessionStats> WebRtcSession::GetStats_n(
     const ChannelNamePairs& channel_name_pairs) {
   RTC_DCHECK(network_thread()->IsCurrent());