[mojo-edk] Add explicit message object APIs

mojo/edk/system/dispatcher.cc

 // 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.
 
 #include "mojo/edk/system/dispatcher.h"
 
 #include "base/logging.h"
 #include "mojo/edk/system/configuration.h"
 #include "mojo/edk/system/data_pipe_consumer_dispatcher.h"
 #include "mojo/edk/system/data_pipe_producer_dispatcher.h"
@@ skipping 14 matching lines @@
 MojoResult Dispatcher::Watch(MojoHandleSignals signals,
                              const Watcher::WatchCallback& callback,
                              uintptr_t context) {
   return MOJO_RESULT_INVALID_ARGUMENT;
 }
 
 MojoResult Dispatcher::CancelWatch(uintptr_t context) {
   return MOJO_RESULT_INVALID_ARGUMENT;
 }
 
-MojoResult Dispatcher::WriteMessage(const void* bytes,
-                                    uint32_t num_bytes,
-                                    const DispatcherInTransit* dispatchers,
-                                    uint32_t num_dispatchers,
+MojoResult Dispatcher::WriteMessage(std::unique_ptr<MessageForTransit> message,
                                     MojoWriteMessageFlags flags) {
   return MOJO_RESULT_INVALID_ARGUMENT;
 }
 
-MojoResult Dispatcher::ReadMessage(void* bytes,
+MojoResult Dispatcher::ReadMessage(std::unique_ptr<MessageForTransit>* message,
                                    uint32_t* num_bytes,
                                    MojoHandle* handles,
                                    uint32_t* num_handles,
-                                   MojoReadMessageFlags flags) {
+                                   MojoReadMessageFlags flags,
+                                   bool ignore_num_bytes) {
   return MOJO_RESULT_INVALID_ARGUMENT;
 }
 
 MojoResult Dispatcher::DuplicateBufferHandle(
     const MojoDuplicateBufferHandleOptions* options,
     scoped_refptr<Dispatcher>* new_dispatcher) {
   return MOJO_RESULT_INVALID_ARGUMENT;
 }
 
 MojoResult Dispatcher::MapBuffer(
@@ skipping 127 matching lines @@
       return nullptr;
   }
 }
 
 Dispatcher::Dispatcher() {}
 
 Dispatcher::~Dispatcher() {}
 
 }  // namespace edk
 }  // namespace mojo