diff -r 000000000000 -r 6474c204b198 content/canvas/test/reftest/webgl-utils.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/canvas/test/reftest/webgl-utils.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,83 @@
+"use strict";
+
+function parseArgs() {
+  var query = window.location.search.substring(1);
+
+  var split = query.split("&");
+
+  var args = {}
+  for (var i = 0; i < split.length; i++) {
+    var pair = split[i].split("=");
+
+    var key = pair[0];
+    var value = true;
+    if (pair.length >= 2) {
+      eval("value = " + decodeURIComponent(pair[1]) + ";");
+    }
+
+    args[key] = value;
+  }
+
+  return args;
+}
+
+var gArgs = null;
+function arg(key) {
+  if (gArgs === null) {
+    gArgs = parseArgs();
+  }
+
+  var ret = gArgs[key];
+  if (ret === undefined)
+    ret = false;
+
+  return ret;
+}
+
+function initGL(canvas) {
+  if (arg("nogl"))
+    return null;
+
+  var gl = null;
+
+  var withAA = arg("aa");
+  var withAlpha = arg("alpha");
+  var withDepth = arg("depth");
+  var withPremult = arg("premult");
+  var withPreserve = arg("preserve");
+  var withStencil = arg("stencil");
+
+  try {
+    var argDict = {
+      alpha: withAlpha,
+      depth: withDepth,
+      stencil: withStencil,
+      antialias: withAA,
+      premultipliedAlpha: withPremult,
+      preserveDrawingBuffer: withPreserve,
+    };
+    gl = canvas.getContext("experimental-webgl", argDict);
+  } catch(e) {}
+
+  return gl;
+}
+
+function rAF(func) {
+  var raf = window.requestAnimationFrame || window.mozRequestAnimationFrame;
+  raf(func);
+}
+
+var MAX_WAIT_FOR_COMPOSITE_DELAY_MS = 500;
+
+function waitForComposite(func) {
+  var isDone = false;
+  var doneFunc = function () {
+    if (isDone)
+      return;
+    isDone = true;
+    func();
+  };
+
+  rAF(doneFunc);
+  setTimeout(doneFunc, MAX_WAIT_FOR_COMPOSITE_DELAY_MS);
+}