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

webrtc/pc/webrtcsession.h

Index: webrtc/pc/webrtcsession.h
diff --git a/webrtc/pc/webrtcsession.h b/webrtc/pc/webrtcsession.h
index dd8398e933cc6727f29dc88036b77d66f19d989a..0a291bdfb2302817e25a25d0cca6c5adb4bb2398 100644
--- a/webrtc/pc/webrtcsession.h
+++ b/webrtc/pc/webrtcsession.h
@@ -23,7 +23,7 @@
 #include "webrtc/base/sigslot.h"
 #include "webrtc/base/sslidentity.h"
 #include "webrtc/base/thread.h"
-#include "webrtc/media/base/mediachannel.h"
+#include "webrtc/call/call.h"
 #include "webrtc/p2p/base/candidate.h"
 #include "webrtc/p2p/base/transportcontroller.h"
 #include "webrtc/pc/datachannel.h"
@@ -294,6 +294,9 @@ class WebRtcSession :
   void RemoveSctpDataStream(int sid) override;
   bool ReadyToSendData() const override;
 
+  virtual Call::Stats GetCallStats();
+  Call::Stats GetCallStats_s();

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

Do both of these need to be public?

+
   // Returns stats for all channels of all transports.
   // This avoids exposing the internal structures used to track them.
   // The parameterless version creates |ChannelNamePairs| from |voice_channel|,