Ensuring that UDP TURN servers are always used as STUN servers.

webrtc/base/proxyserver.h

Index: webrtc/base/proxyserver.h
diff --git a/webrtc/base/proxyserver.h b/webrtc/base/proxyserver.h
index 83fe6c2c09f3876bc1a80e0f9598cab45f3d503f..711ed55bf881c4de64d325041bd2acdf5b12d93a 100644
--- a/webrtc/base/proxyserver.h
+++ b/webrtc/base/proxyserver.h
@@ -64,6 +64,9 @@ class ProxyServer : public sigslot::has_slots<> {
               SocketFactory* ext_factory, const SocketAddress& ext_ip);
   ~ProxyServer() override;
 
+  // Returns the address to which the proxy server is bound
+  SocketAddress GetServerAddress();
+
  protected:
   void OnAcceptEvent(AsyncSocket* socket);
   virtual AsyncProxyServerSocket* WrapSocket(AsyncSocket* socket) = 0;