DOMUI prefs: Add and wire up a stub overlay for adding a startup page.

chrome/browser/resources/options/browser_options.js

 // Copyright (c) 2010 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.
 
 //
 // BrowserOptions class
 // Encapsulated handling of browser options page.
 //
 function BrowserOptions() {
   OptionsPage.call(this, 'browser', templateData.browserPage, 'browserPage');
 }
 
 cr.addSingletonGetter(BrowserOptions);
 
 BrowserOptions.prototype = {
   // Inherit BrowserOptions from OptionsPage.
   __proto__: OptionsPage.prototype,
 
   /**
    * Initialize BrowserOptions page.
    */
   initializePage: function() {
     // Call base class implementation to start preference initialization.
     OptionsPage.prototype.initializePage.call(this);
 
     // Wire up buttons.
     $('startupAddButton').onclick = function(event) {
-      // TODO(stuartmorgan): Spawn add sub-dialog.
+      OptionsPage.showOverlay('addStartupPageOverlay');
     };
     $('startupRemoveButton').onclick = function(event) {
       // TODO(stuartmorgan): Remove selected element(s).
     };
     $('startupUseCurrentButton').onclick = function(event) {
       // TODO(stuartmorgan): Add all open tabs (except this one).
     };
     $('defaultSearchManageEnginesButton').onclick = function(event) {
       // TODO(stuartmorgan): Spawn search engine management sub-dialog.
     };
@@ skipping 69 matching lines @@
 };
 
 BrowserOptions.updateDefaultBrowserState = function(statusString, isDefault) {
   BrowserOptions.getInstance().updateDefaultBrowserState_(statusString,
                                                           isDefault);
 }
 
 BrowserOptions.updateSearchEngines = function(engines, defaultValue) {
   BrowserOptions.getInstance().updateSearchEngines_(engines, defaultValue);
 }