diff -r 000000000000 -r 6474c204b198 layout/analysis/pixel-conversion.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/analysis/pixel-conversion.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,10 @@
+/* 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/. */
+
+include("simple-match.js");
+
+var patterns = {CSSPixelsToDevPixels: ['AppUnitsToDevPixels', 'CSSPixelsToAppUnits'],
+                DevPixelsToIntCSSPixels: ['AppUnitsToIntCSSPixels', 'DevPixelsToAppUnits'],
+                DevPixelsToFloatCSSPixels: ['AppUnitsToFloatCSSPixels', 'DevPixelsToAppUnits'],
+               };