Reset the BWE when the network changes

webrtc/media/engine/webrtcvideoengine2.cc

Index: webrtc/media/engine/webrtcvideoengine2.cc
diff --git a/webrtc/media/engine/webrtcvideoengine2.cc b/webrtc/media/engine/webrtcvideoengine2.cc
index 6442613081e73492c494fce9d1a0e1bcfa99a591..3654d4b68b62a5fbb27b3d479a79e21c71c97646 100644
--- a/webrtc/media/engine/webrtcvideoengine2.cc
+++ b/webrtc/media/engine/webrtcvideoengine2.cc
@@ -1351,6 +1351,10 @@ void WebRtcVideoChannel2::OnReadyToSend(bool ready) {
   call_->SignalNetworkState(ready ? webrtc::kNetworkUp : webrtc::kNetworkDown);
 }
 
+void WebRtcVideoChannel2::OnBestConnectionChanged(Connection* connection) {
+  call_->OnBestConnectionChanged(connection);
+}
+
 bool WebRtcVideoChannel2::MuteStream(uint32_t ssrc, bool mute) {
   LOG(LS_VERBOSE) << "MuteStream: " << ssrc << " -> "
                   << (mute ? "mute" : "unmute");