Mojo: Implement local passing of MessagePipes.

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 <vector>
 
 #include "base/basictypes.h"
@@ skipping 37 matching lines @@
   // Unlike |MessagePipeDispatcher::WriteMessage()|, this does not validate its
   // arguments.
   MojoResult WriteMessage(unsigned port,
                           const void* bytes, uint32_t num_bytes,
                           const std::vector<Dispatcher*>* dispatchers,
                           MojoWriteMessageFlags flags);
   // Unlike |MessagePipeDispatcher::ReadMessage()|, this does not validate its
   // arguments.
   MojoResult ReadMessage(unsigned port,
                          void* bytes, uint32_t* num_bytes,
-                         uint32_t max_num_dispatchers,
                          std::vector<scoped_refptr<Dispatcher> >* dispatchers,
+                         uint32_t* num_dispatchers,
                          MojoReadMessageFlags flags);
   MojoResult AddWaiter(unsigned port,
                        Waiter* waiter,
                        MojoWaitFlags flags,
                        MojoResult wake_result);
   void RemoveWaiter(unsigned port, Waiter* waiter);
 
   // This is used internally by |WriteMessage()| and by |Channel| to enqueue
   // messages (typically to a |LocalMessagePipeEndpoint|). Unlike
   // |WriteMessage()|, |port| is the *destination* port. Takes ownership of
@@ skipping 19 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_