diff -r 000000000000 -r 6474c204b198 content/canvas/test/webgl-conformance/resources/cors-util.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/canvas/test/webgl-conformance/resources/cors-util.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,31 @@
+/* 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/. */
+
+function getExampleDotComURL(conformanceDirRelativePath) {
+  var prefix = 'http://example.com/tests/content/canvas/test/webgl-conformance/';
+  return prefix + conformanceDirRelativePath;
+}
+
+function setExampleDotComImage(imageElemID, imagePath, relPathToBase, onLoadCallback) {
+  var img = document.getElementById(imageElemID);
+  if (!img)
+    throw 'Bad `imageElemID`: ' + imageElemID;
+
+  if (onLoadCallback)
+    img.onload = onLoadCallback;
+
+  img.onerror = function() {
+    console.log('Failed to load image from: ' + img.src);
+    console.log('Loading same-domain backup image.');
+
+    img.onerror = function() {
+      console.log('Failed to load backup image from: ' + img.src);
+      return;
+    };
+
+    img.src = relPathToBase + imagePath;
+  };
+
+  img.src = getExampleDotComURL(imagePath);
+}