Add interfaces for most major Blimp net components.

blimp/net/blimp_message_receiver.h

-// Copyright 2015 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 BLIMP_NET_BLIMP_MESSAGE_RECEIVER_H_
-#define BLIMP_NET_BLIMP_MESSAGE_RECEIVER_H_
-
-#include "net/base/net_errors.h"
-
-namespace blimp {
-
-class BlimpMessage;
-
-// Interface implemented by components that process BlimpMessages.
-class BlimpMessageReceiver {
- public:
-  virtual ~BlimpMessageReceiver() {}
-
-  // Processes the BlimpMessage, or returns a net::ERR_* on error.
-  // If an error code is returned, callers should terminate the connection
-  // from which |message| was received.
-  virtual net::Error OnBlimpMessage(const BlimpMessage& message) = 0;
-};
-
-}  // namespace blimp
-
-#endif  // BLIMP_NET_BLIMP_MESSAGE_RECEIVER_H_