diff -r 000000000000 -r 6474c204b198 gfx/src/AppUnits.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/src/AppUnits.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,15 @@
+/* -*- Mode: C++; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* 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_AppUnits_h
+#define mozilla_AppUnits_h
+
+#include <stdint.h>
+
+namespace mozilla {
+inline int32_t AppUnitsPerCSSPixel() { return 60; }
+inline int32_t AppUnitsPerCSSInch() { return 96 * AppUnitsPerCSSPixel(); }
+}
+#endif /* _NS_APPUNITS_H_ */