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 fbd5961dfda0c8b693bf1fdb438c3f90d6c5ad8b..f807d84b1913298fb2e926ee8efb327bf027d581 100644
--- a/webrtc/media/engine/webrtcvideoengine2.cc
+++ b/webrtc/media/engine/webrtcvideoengine2.cc
@@ -1428,6 +1428,12 @@ void WebRtcVideoChannel2::OnReadyToSend(bool ready) {
       ready ? webrtc::kNetworkUp : webrtc::kNetworkDown);
 }
 
+void WebRtcVideoChannel2::OnNetworkRouteChanged(
+    const std::string& transport_name,
+    const NetworkRoute& network_route) {
+  call_->OnNetworkRouteChanged(transport_name, network_route);
+}
+
 bool WebRtcVideoChannel2::MuteStream(uint32_t ssrc, bool mute) {
   LOG(LS_VERBOSE) << "MuteStream: " << ssrc << " -> "
                   << (mute ? "mute" : "unmute");