diff -r 000000000000 -r 6474c204b198 ipc/glue/Transport_posix.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ipc/glue/Transport_posix.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,45 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=8 et :
+ */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_ipc_Transport_posix_h
+#define mozilla_ipc_Transport_posix_h 1
+
+#include "ipc/IPCMessageUtils.h"
+
+
+namespace mozilla {
+namespace ipc {
+
+struct TransportDescriptor
+{
+  base::FileDescriptor mFd;
+};
+
+} // namespace ipc
+} // namespace mozilla
+
+
+namespace IPC {
+
+template<>
+struct ParamTraits<mozilla::ipc::TransportDescriptor>
+{
+  typedef mozilla::ipc::TransportDescriptor paramType;
+  static void Write(Message* aMsg, const paramType& aParam)
+  {
+    WriteParam(aMsg, aParam.mFd);
+  }
+  static bool Read(const Message* aMsg, void** aIter, paramType* aResult)
+  {
+    return ReadParam(aMsg, aIter, &aResult->mFd);
+  }
+};
+
+} // namespace IPC
+
+
+#endif  // mozilla_ipc_Transport_posix_h