Add MessagePipe interface. Use it in ChannelDispatcherBase.

remoting/protocol/channel_dispatcher_base.h

Index: remoting/protocol/channel_dispatcher_base.h
diff --git a/remoting/protocol/channel_dispatcher_base.h b/remoting/protocol/channel_dispatcher_base.h
index eca2d12d9892e4962e7b059cf857ddcf2481479c..2e940c664498e7bc1cb20de8e5629898519f0aba 100644
--- a/remoting/protocol/channel_dispatcher_base.h
+++ b/remoting/protocol/channel_dispatcher_base.h
@@ -12,11 +12,15 @@
 #include "base/memory/scoped_ptr.h"
 #include "remoting/base/buffered_socket_writer.h"
 #include "remoting/protocol/errors.h"
-#include "remoting/protocol/message_reader.h"
 
 namespace remoting {
+
+class CompoundBuffer;
+
 namespace protocol {
 
+class MessagePipe;
+class P2PStreamSocket;
 class StreamChannelFactory;
 
 // Base class for channel message dispatchers. It's responsible for
@@ -49,27 +53,25 @@ class ChannelDispatcherBase {
   const std::string& channel_name() { return channel_name_; }
 
   // Returns true if the channel is currently connected.
-  bool is_connected() { return channel_ != nullptr; }
+  bool is_connected() { return message_pipe() != nullptr; }
 
  protected:
   explicit ChannelDispatcherBase(const char* channel_name);
 
-  BufferedSocketWriter* writer() { return &writer_; }
+  MessagePipe* message_pipe() { return message_pipe_.get(); }
 
   // Child classes must override this method to handle incoming messages.
   virtual void OnIncomingMessage(scoped_ptr<CompoundBuffer> message) = 0;
 
  private:
   void OnChannelReady(scoped_ptr<P2PStreamSocket> socket);
-  void OnReadWriteFailed(int error);
+  void OnPipeError(int error);
 
   std::string channel_name_;
   StreamChannelFactory* channel_factory_;
   EventHandler* event_handler_;
-  scoped_ptr<P2PStreamSocket> channel_;
 
-  BufferedSocketWriter writer_;
-  MessageReader reader_;
+  scoped_ptr<MessagePipe> message_pipe_;
 
   DISALLOW_COPY_AND_ASSIGN(ChannelDispatcherBase);
 };