Mojo: Make MessagePipe::ConvertLocalToProxy() create the ChannelEndpoint.

mojo/system/message_pipe.h

 // Copyright 2013 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 MOJO_SYSTEM_MESSAGE_PIPE_H_
 #define MOJO_SYSTEM_MESSAGE_PIPE_H_
 
 #include <stdint.h>
 
 #include <vector>
@@ skipping 68 matching lines @@
                        Waiter* waiter,
                        MojoHandleSignals signals,
                        uint32_t context,
                        HandleSignalsState* signals_state);
   void RemoveWaiter(unsigned port,
                     Waiter* waiter,
                     HandleSignalsState* signals_state);
 
   // This is called by the dispatcher to convert a local endpoint to a proxy
   // endpoint.
-  void ConvertLocalToProxy(unsigned port);
+  scoped_refptr<ChannelEndpoint> ConvertLocalToProxy(unsigned port);
 
   // This is used by |Channel| to enqueue messages (typically to a
   // |LocalMessagePipeEndpoint|). Unlike |WriteMessage()|, |port| is the
   // *destination* port.
   MojoResult EnqueueMessage(unsigned port,
                             scoped_ptr<MessageInTransit> message);
 
   // These are used by |Channel|.
   bool Attach(unsigned port, ChannelEndpoint* channel_endpoint);
   void Run(unsigned port);
@@ skipping 25 matching lines @@
   base::Lock lock_;  // Protects the following members.
   scoped_ptr<MessagePipeEndpoint> endpoints_[2];
 
   DISALLOW_COPY_AND_ASSIGN(MessagePipe);
 };
 
 }  // namespace system
 }  // namespace mojo
 
 #endif  // MOJO_SYSTEM_MESSAGE_PIPE_H_