Mojo: First stab at making MessagePipes work across OS pipes.

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 "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "mojo/public/system/core.h"
 #include "mojo/system/message_pipe_endpoint.h"
 #include "mojo/system/waiter_list.h"
 
 namespace mojo {
 namespace system {
 
-class MessageInTransit;
-
 class LocalMessagePipeEndpoint : public MessagePipeEndpoint {
  public:
   LocalMessagePipeEndpoint();
   virtual ~LocalMessagePipeEndpoint();
 
   // |MessagePipeEndpoint| implementation:
-  virtual void OnPeerClose() OVERRIDE;
-  virtual MojoResult EnqueueMessage(
-      const void* bytes, uint32_t num_bytes,
-      const MojoHandle* handles, uint32_t num_handles,
-      MojoWriteMessageFlags flags) OVERRIDE;
+  virtual void Close() OVERRIDE;
+  virtual bool OnPeerClose() OVERRIDE;
+  virtual MojoResult EnqueueMessage(MessageInTransit* message) OVERRIDE;
 
   // There's a dispatcher for |LocalMessagePipeEndpoint|s, so we have to
   // implement/override these:
   virtual void CancelAllWaiters() OVERRIDE;
-  virtual void Close() OVERRIDE;
   virtual MojoResult ReadMessage(void* bytes, uint32_t* num_bytes,
                                  MojoHandle* handles, uint32_t* num_handles,
                                  MojoReadMessageFlags flags) OVERRIDE;
   virtual MojoResult AddWaiter(Waiter* waiter,
                                MojoWaitFlags flags,
                                MojoResult wake_result) OVERRIDE;
   virtual void RemoveWaiter(Waiter* waiter) OVERRIDE;
 
  private:
   MojoWaitFlags SatisfiedFlags();
   MojoWaitFlags SatisfiableFlags();
 
   bool is_open_;
   bool is_peer_open_;
 
   std::deque<MessageInTransit*> message_queue_;
   WaiterList waiter_list_;
 
   DISALLOW_COPY_AND_ASSIGN(LocalMessagePipeEndpoint);
 };
 
 }  // namespace system
 }  // namespace mojo
 
 #endif  // MOJO_SYSTEM_LOCAL_MESSAGE_PIPE_ENDPOINT_H_