Separates ipc code from common (http://crbug.com/16829)

chrome/common/ipc_channel_handle.h

-// Copyright (c) 2009 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 CHROME_COMMON_IPC_CHANNEL_HANDLE_H_
-#define CHROME_COMMON_IPC_CHANNEL_HANDLE_H_
-
-#include "build/build_config.h"
-
-#if defined(OS_POSIX)
-#include "base/file_descriptor_posix.h"
-#endif
-
-// 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 POSIX, we instead pass around handles to channel endpoints via IPC.
-// When it's time to IPC a new channel endpoint around, we send both the
-// channel name as well as a base::FileDescriptor, which is itself a special
-// type that knows how to copy a socket endpoint over IPC.
-//
-// In sum, when passing a handle to a channel over IPC, use this data structure
-// to work on both Windows and POSIX.
-
-namespace IPC {
-
-struct ChannelHandle {
-  // Note that serialization for this object is defined in the ParamTraits
-  // template specialization in ipc_message_utils.h.
-  std::string name;
-#if defined(OS_POSIX)
-  base::FileDescriptor socket;
-#endif
-
-  ChannelHandle() {}
-#if defined(OS_POSIX)
-  ChannelHandle(const std::string& n, const base::FileDescriptor& s)
-      : name(n), socket(s) {}
-#else
-  ChannelHandle(const std::string& n) : name(n) {}
-#endif
-};
-
-}  // namespace IPC
-
-#endif  // CHROME_COMMON_IPC_CHANNEL_HANDLE_H_