Fix LibjingleTransportFactory to refresh STUN/Relay.

remoting/protocol/transport.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // This file defines the interface for peer-to-peer transport. There
 // are two types of transport: StreamTransport and DatagramTransport.
 // They must both be created using TransportFactory instances and they
 // provide the same interface, except that one should be used for
 // reliable stream connection and the other one for unreliable
 // datagram connection. The Transport interface itself doesn't provide
@@ skipping 25 matching lines @@
 
 namespace net {
 class Socket;
 class StreamSocket;
 }  // namespace net
 
 namespace remoting {
 namespace protocol {
 
 class ChannelAuthenticator;
-struct TransportConfig;
 
 struct TransportRoute {
   enum RouteType {
     DIRECT,
     STUN,
     RELAY,
   };
 
   // Helper method to get string representation of the type.
   static std::string GetTypeString(RouteType type);
@@ skipping 87 matching lines @@
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DatagramTransport);
 };
 
 class TransportFactory {
  public:
   TransportFactory() { }
   virtual ~TransportFactory() { }
 
-  // Sets configuration for the transports created by this factory.
-  virtual void SetTransportConfig(const TransportConfig& config) = 0;
+  // Called to notify transport factory that a new transport might be created
+  // soon, e.g. when a new session is being created. Implementation may use it
+  // to start asynchronous preparation, e.g. fetch a new relay token if
+  // necessary while the session is being authenticated.
+  virtual void PrepareTokens() = 0;
 
   virtual scoped_ptr<StreamTransport> CreateStreamTransport() = 0;
   virtual scoped_ptr<DatagramTransport> CreateDatagramTransport() = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TransportFactory);
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_TRANSPORT_H_