Support using a Mojo message pipe in a ChannelHandle.

ipc/ipc_channel_handle.h

 // Copyright (c) 2012 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 IPC_IPC_CHANNEL_HANDLE_H_
 #define IPC_IPC_CHANNEL_HANDLE_H_
 
 #include <string>
 
 #include "build/build_config.h"
+#include "mojo/public/cpp/system/message_pipe.h"
 
 #if defined(OS_POSIX)
 #include "base/file_descriptor_posix.h"
 #elif defined(OS_WIN)
 #include <windows.h>
 #endif  // defined (OS_WIN)
 
 // On Windows, any process can create an IPC channel and others can fetch
 // it by name.  We pass around the channel names over IPC.
 // On Windows the initialization of ChannelHandle with an existing pipe
@@ skipping 19 matching lines @@
   // Otherwise there may be a problem in IPC communication between
   // processes with different working directories.
   ChannelHandle(const std::string& n) : name(n) {}
   ChannelHandle(const char* n) : name(n) {}
 #if defined(OS_WIN)
   explicit ChannelHandle(HANDLE h) : pipe(h) {}
 #elif defined(OS_POSIX)
   ChannelHandle(const std::string& n, const base::FileDescriptor& s)
       : name(n), socket(s) {}
 #endif  // defined(OS_POSIX)
+  ChannelHandle(mojo::MessagePipeHandle h) : mojo_handle(h) {}
 
   std::string name;
 #if defined(OS_POSIX)
   base::FileDescriptor socket;
 #elif defined(OS_WIN)
   // A simple container to automatically initialize pipe handle
   struct PipeHandle {
     PipeHandle() : handle(NULL) {}
     PipeHandle(HANDLE h) : handle(h) {}
     HANDLE handle;
   };
   PipeHandle pipe;
 #endif  // defined (OS_WIN)
+  mojo::MessagePipeHandle mojo_handle;
 };
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_CHANNEL_HANDLE_H_