Implement smoother autosizing of the extension options overlay

chrome/test/data/extensions/api_test/extension_options/embed_self/test.js

 // Copyright 2014 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.
 
 function optionsPageLoaded() {
   var hasLoaded = false;
   chrome.extension.getViews().forEach(function(view) {
     if (view.document.location.pathname == '/options.html') {
       chrome.test.assertEq(false, hasLoaded);
       hasLoaded = view.loaded;
@@ skipping 107 matching lines @@
     var extensionoptions = new ExtensionOptions();
     extensionoptions.extension = chrome.runtime.id;
     extensionoptions.autosize = 'on';
     extensionoptions.minheight = 499;
     extensionoptions.minwidth = 499;
     extensionoptions.maxheight = 501;
     extensionoptions.maxwidth = 501;
 
     extensionoptions.onsizechanged = function(evt) {
       try {
-        chrome.test.assertTrue(evt.width >= 499);
-        chrome.test.assertTrue(evt.height >= 499);
-        chrome.test.assertTrue(evt.width <= 501);
-        chrome.test.assertTrue(evt.height <= 501);
+        chrome.test.assertTrue(evt.newWidth >= 499);
+        chrome.test.assertTrue(evt.newHeight >= 499);
+        chrome.test.assertTrue(evt.newWidth <= 501);
+        chrome.test.assertTrue(evt.newHeight <= 501);
         done();
       } finally {
         document.body.removeChild(extensionoptions);
       }
     };
 
     document.body.appendChild(extensionoptions);
   },
 
   function externalLinksOpenInNewTab() {
@@ skipping 12 matching lines @@
           document.body.removeChild(extensionoptions);
         }
       }
     });
 
     var extensionoptions = document.createElement('extensionoptions');
     extensionoptions.setAttribute('extension', chrome.runtime.id);
     document.body.appendChild(extensionoptions);
   }
 ]);