Make the audio channel communicate network state changes to the call.

webrtc/call.h

Index: webrtc/call.h
diff --git a/webrtc/call.h b/webrtc/call.h
index 313c5e58c16f49446c8d6fbcdaa92950179628a8..9a3a2360ef1ca92e61919dab0c7f740686ab1521 100644
--- a/webrtc/call.h
+++ b/webrtc/call.h
@@ -133,7 +133,9 @@ class Call {
   // implemented.
   virtual void SetBitrateConfig(
       const Config::BitrateConfig& bitrate_config) = 0;
-  virtual void SignalNetworkState(NetworkState state) = 0;
+
+  virtual void SignalChannelNetworkState(MediaType media,

[pthatcher1, 2016/03/05 02:21:09]

We're going to need a TODO here to handle the complete unbundled case where the
*same* media type has different streams that flow over different networks with
different states.  But it's a while down the road and we might choose to not
support it that well anyway.

[skvlad, 2016/03/07 19:20:56]

Done.

+      NetworkState state) = 0;
 
   virtual void OnSentPacket(const rtc::SentPacket& sent_packet) = 0;