Notifications API support for images with multiple scale factors.

chrome/renderer/resources/extensions/notifications_test_util.js

Index: chrome/renderer/resources/extensions/notifications_test_util.js
diff --git a/chrome/renderer/resources/extensions/notifications_test_util.js b/chrome/renderer/resources/extensions/notifications_test_util.js
index 85a30eee2bc1eeca029744e8ad0fca4885edbae6..d0d839a5cdd521f78b1a2df0db3b0171c0b5b8ce 100644
--- a/chrome/renderer/resources/extensions/notifications_test_util.js
+++ b/chrome/renderer/resources/extensions/notifications_test_util.js
@@ -40,14 +40,22 @@ var requireNative = function(library) {
 
 var exports = {};
 
-var $Array = {
-  push: function (ary, val) {
-    ary.push(val);
-  }
-};
+function makeStaticFunction(obj, methodName) {
+  return function() {
+    var self = arguments[0];
+    var args = Array.prototype.slice.call(arguments, 1);
+    return obj.prototype[methodName].apply(self, args);
+  };
+}
 
-var $Function = {
-  bind: function (fn, context) {
-    return fn.bind(context);
-  }
-};
+var $Array = { self: Array };
+["push", "concat", "splice", "forEach"].forEach(function (name) {
+  $Array[name] = makeStaticFunction(Array, name);
+});
+
+var $Function = { self: Function };
+["bind"].forEach(function(name) {
+  $Function[name] = makeStaticFunction(Function, name);
+});
+
+var $String = { self: String };