Reset the BWE when the network changes

webrtc/call.h

Index: webrtc/call.h
diff --git a/webrtc/call.h b/webrtc/call.h
index 313c5e58c16f49446c8d6fbcdaa92950179628a8..70d259ed0740561da37a29beed9e67ebaf5a9b25 100644
--- a/webrtc/call.h
+++ b/webrtc/call.h
@@ -21,6 +21,10 @@
 #include "webrtc/video_receive_stream.h"
 #include "webrtc/video_send_stream.h"
 
+namespace cricket {
+class Connection;
+}  // namespace cricket
+
 namespace webrtc {
 
 class AudioProcessing;
@@ -135,6 +139,8 @@ class Call {
       const Config::BitrateConfig& bitrate_config) = 0;
   virtual void SignalNetworkState(NetworkState state) = 0;
 
+  virtual void OnBestConnectionChanged(cricket::Connection* connection) = 0;
+
   virtual void OnSentPacket(const rtc::SentPacket& sent_packet) = 0;
 
   virtual ~Call() {}