Make it possible to write a message pipe endpoint's peer into it.

mojo/edk/system/platform_handle_dispatcher.h

 // Copyright 2014 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_EDK_SYSTEM_PLATFORM_HANDLE_DISPATCHER_H_
 #define MOJO_EDK_SYSTEM_PLATFORM_HANDLE_DISPATCHER_H_
 
 #include <vector>
 
 #include "mojo/edk/platform/scoped_platform_handle.h"
@@ skipping 28 matching lines @@
       size_t size,
       std::vector<platform::ScopedPlatformHandle>* platform_handles);
 
  private:
   explicit PlatformHandleDispatcher(
       platform::ScopedPlatformHandle platform_handle);
   ~PlatformHandleDispatcher() override;
 
   // |Dispatcher| protected methods:
   void CloseImplNoLock() override;
-  util::RefPtr<Dispatcher> CreateEquivalentDispatcherAndCloseImplNoLock()
-      override;
+  util::RefPtr<Dispatcher> CreateEquivalentDispatcherAndCloseImplNoLock(
+      MessagePipe* message_pipe,
+      unsigned port) override;
   void StartSerializeImplNoLock(Channel* channel,
                                 size_t* max_size,
                                 size_t* max_platform_handles) override
       MOJO_NOT_THREAD_SAFE;
   bool EndSerializeAndCloseImplNoLock(
       Channel* channel,
       void* destination,
       size_t* actual_size,
       std::vector<platform::ScopedPlatformHandle>* platform_handles) override
       MOJO_NOT_THREAD_SAFE;
 
   platform::ScopedPlatformHandle platform_handle_ MOJO_GUARDED_BY(mutex());
 
   MOJO_DISALLOW_COPY_AND_ASSIGN(PlatformHandleDispatcher);
 };
 
 }  // namespace system
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_PLATFORM_HANDLE_DISPATCHER_H_