Add IceConfig and IceConfigRequest.

remoting/protocol/ice_config_request.h

+// Copyright 2016 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.
+
+#ifndef REMOTING_PROTOCOL_ICE_CONFIG_REQUEST_H_
+#define REMOTING_PROTOCOL_ICE_CONFIG_REQUEST_H_
+
+#include "base/callback_forward.h"
+
+namespace remoting {
+namespace protocol {
+
+struct IceConfig;
+
+// Abstract interface used to fetch STUN and TURN configuration.
+class IceConfigRequest {
+ public:
+  // Callback to receive results of the request. |ice_config| is null if the
+  // request has failed.
+  typedef base::Callback<void(const IceConfig& ice_config)> OnIceConfigCallback;
+
+  virtual ~IceConfigRequest() {}
+
+  // Sends the request and calls the |callback| with the results.
+  virtual void Send(const OnIceConfigCallback& callback) = 0;
+};
+
+}  // namespace protocol
+}  // namespace remoting
+
+#endif  // REMOTING_PROTOCOL_ICE_CONFIG_REQUEST_H_