Mojo: Implement local passing of MessagePipes.

mojo/system/local_message_pipe_endpoint.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_LOCAL_MESSAGE_PIPE_ENDPOINT_H_
 #define MOJO_SYSTEM_LOCAL_MESSAGE_PIPE_ENDPOINT_H_
 
 #include <deque>
 #include <vector>
 
@@ skipping 20 matching lines @@
       const std::vector<Dispatcher*>* dispatchers) OVERRIDE;
   virtual void EnqueueMessage(
       MessageInTransit* message,
       std::vector<scoped_refptr<Dispatcher> >* dispatchers) OVERRIDE;
 
   // There's a dispatcher for |LocalMessagePipeEndpoint|s, so we have to
   // implement/override these:
   virtual void CancelAllWaiters() OVERRIDE;
   virtual MojoResult ReadMessage(
       void* bytes, uint32_t* num_bytes,
-      uint32_t max_num_dispatchers,
       std::vector<scoped_refptr<Dispatcher> >* dispatchers,
+      uint32_t* num_dispatchers,
       MojoReadMessageFlags flags) OVERRIDE;
   virtual MojoResult AddWaiter(Waiter* waiter,
                                MojoWaitFlags flags,
                                MojoResult wake_result) OVERRIDE;
   virtual void RemoveWaiter(Waiter* waiter) OVERRIDE;
 
  private:
   struct MessageQueueEntry {
     MessageQueueEntry();
     // Provide an explicit copy constructor, so that we can use this directly in
@@ skipping 20 matching lines @@
   std::deque<MessageQueueEntry> message_queue_;
   WaiterList waiter_list_;
 
   DISALLOW_COPY_AND_ASSIGN(LocalMessagePipeEndpoint);
 };
 
 }  // namespace system
 }  // namespace mojo
 
 #endif  // MOJO_SYSTEM_LOCAL_MESSAGE_PIPE_ENDPOINT_H_