diff -r 000000000000 -r 6474c204b198 gfx/layers/ipc/FenceUtilsGonk.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/layers/ipc/FenceUtilsGonk.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,53 @@
+/* -*- 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_layers_FenceUtilsGonk_h
+#define mozilla_layers_FenceUtilsGonk_h
+
+#include <unistd.h>
+#include <ui/Fence.h>
+
+#include "ipc/IPCMessageUtils.h"
+
+namespace mozilla {
+namespace layers {
+
+struct FenceHandle {
+  typedef android::Fence Fence;
+
+  FenceHandle()
+  { }
+  FenceHandle(const android::sp<Fence>& aFence);
+
+  bool operator==(const FenceHandle& aOther) const {
+    return mFence.get() == aOther.mFence.get();
+  }
+
+  bool IsValid() const
+  {
+    return mFence.get() && mFence->isValid();
+  }
+
+  android::sp<Fence> mFence;
+};
+
+} // namespace layers
+} // namespace mozilla
+
+namespace IPC {
+
+template <>
+struct ParamTraits<mozilla::layers::FenceHandle> {
+  typedef mozilla::layers::FenceHandle paramType;
+
+  static void Write(Message* aMsg, const paramType& aParam);
+  static bool Read(const Message* aMsg, void** aIter, paramType* aResult);
+};
+
+} // namespace IPC
+
+#endif  // mozilla_layers_FenceUtilsGonk_h