diff -r 000000000000 -r 6474c204b198 ipc/chromium/src/base/file_descriptor_posix.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ipc/chromium/src/base/file_descriptor_posix.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,36 @@
+// Copyright (c) 2006-2009 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 BASE_FILE_DESCRIPTOR_POSIX_H_
+#define BASE_FILE_DESCRIPTOR_POSIX_H_
+
+namespace base {
+
+// -----------------------------------------------------------------------------
+// We introduct a special structure for file descriptors in order that we are
+// able to use template specialisation to special-case their handling.
+//
+// WARNING: (Chromium only) There are subtleties to consider if serialising
+// these objects over IPC. See comments in chrome/common/ipc_message_utils.h
+// above the template specialisation for this structure.
+// -----------------------------------------------------------------------------
+struct FileDescriptor {
+  FileDescriptor()
+      : fd(-1),
+        auto_close(false) { }
+
+  FileDescriptor(int ifd, bool iauto_close)
+      : fd(ifd),
+        auto_close(iauto_close) { }
+
+  int fd;
+  // If true, this file descriptor should be closed after it has been used. For
+  // example an IPC system might interpret this flag as indicating that the
+  // file descriptor it has been given should be closed after use.
+  bool auto_close;
+};
+
+}  // namespace base
+
+#endif  // BASE_FILE_DESCRIPTOR_POSIX_H_