Create new class "CastTransport", which encapsulates the message read and write event loops.

extensions/browser/api/cast_channel/cast_socket.h

 // Copyright 2014 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 EXTENSIONS_BROWSER_API_CAST_CHANNEL_CAST_SOCKET_H_
 #define EXTENSIONS_BROWSER_API_CAST_CHANNEL_CAST_SOCKET_H_
 
 #include <queue>
 #include <string>
 
@@ skipping 29 matching lines @@
 class Logger;
 struct LastErrors;
 class MessageFramer;
 
 // This class implements a channel between Chrome and a Cast device using a TCP
 // socket with SSL.  The channel may authenticate that the receiver is a genuine
 // Cast device.  All CastSocket objects must be used only on the IO thread.
 //
 // NOTE: Not called "CastChannel" to reduce confusion with the generated API
 // code.
+// TODO(kmarshall): Inherit from CastSocket and rename to CastSocketImpl.
 class CastSocket : public ApiResource {
  public:
-  // Object to be informed of incoming messages and errors.  The CastSocket that
-  // owns the delegate must not be deleted by it, only by the ApiResourceManager
-  // or in the callback to Close().
+  // Object to be informed of incoming messages and errors.  The CastSocket
+  // that owns the delegate must not be deleted by it, only by the
+  // ApiResourceManager or in the callback to Close().
   class Delegate {
    public:
     // An error occurred on the channel. |last_errors| contains the last errors
     // logged for the channel from the implementation.
     virtual void OnError(const CastSocket* socket,
                          ChannelError error_state,
                          const LastErrors& last_errors) = 0;
     // A message was received on the channel.
     virtual void OnMessage(const CastSocket* socket,
                            const MessageInfo& message) = 0;
@@ skipping 270 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(CastSocketTest, TestReadHeaderParseError);
   FRIEND_TEST_ALL_PREFIXES(CastSocketTest, TestReadMany);
   FRIEND_TEST_ALL_PREFIXES(CastSocketTest, TestWriteErrorLargeMessage);
   DISALLOW_COPY_AND_ASSIGN(CastSocket);
 };
 }  // namespace cast_channel
 }  // namespace core_api
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_CAST_CHANNEL_CAST_SOCKET_H_