Fixing iframe jank in the local omnibox popup.

ui/webui/resources/js/util.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+<include src="assert.js">
+
 /**
  * The global object.
  * @type {!Object}
  * @const
  */
 var global = this;
 
 /**
  * Alias for document.getElementById.
  * @param {string} id The ID of the element to find.
@@ skipping 176 matching lines @@
 
 /**
  * Check the directionality of the page.
  * @return {boolean} True if Chrome is running an RTL UI.
  */
 function isRTL() {
   return document.documentElement.dir == 'rtl';
 }
 
 /**
- * Simple common assertion API
- * @param {*} condition The condition to test.  Note that this may be used to
- *     test whether a value is defined or not, and we don't want to force a
- *     cast to Boolean.
- * @param {string=} opt_message A message to use in any error.
- */
-function assert(condition, opt_message) {
-  'use strict';
-  if (!condition) {
-    var msg = 'Assertion failed';
-    if (opt_message)
-      msg = msg + ': ' + opt_message;
-    throw new Error(msg);
-  }
-}
-
-/**
  * Get an element that's known to exist by its ID. We use this instead of just
  * calling getElementById and not checking the result because this lets us
  * satisfy the JSCompiler type system.
  * @param {string} id The identifier name.
  * @return {!Element} the Element.
  */
 function getRequiredElement(id) {
   var element = $(id);
   assert(element, 'Missing required element: ' + id);
   return element;
@@ skipping 84 matching lines @@
  * Creates an element of a specified type with a specified class name.
  * @param {string} type The node type.
  * @param {string} className The class name to use.
  * @return {Element} The created element.
  */
 function createElementWithClassName(type, className) {
   var elm = document.createElement(type);
   elm.className = className;
   return elm;
 }