[uber] Redoing the homepage selection UI

chrome/browser/resources/options2/settings_dialog.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.
 
 /**
  * @fileoverview Base class for dialogs that require saving preferences on
  *     confirm and resetting preference inputs on cancel.
  */
 
 cr.define('options', function() {
@@ skipping 24 matching lines @@
     initializePage: function() {
       this.okButton.onclick = this.handleConfirm_.bind(this);
       this.cancelButton.onclick = this.handleCancel_.bind(this);
     },
 
     /**
      * Handles the confirm button by saving the dialog preferences.
      * @private
      */
     handleConfirm_: function() {
+      this.willConfirm();
       OptionsPage.closeOverlay();
 
       var els = this.pageDiv.querySelectorAll('[dialog-pref]');
       for (var i = 0; i < els.length; i++) {
         if (els[i].savePrefState)
           els[i].savePrefState();
       }
     },
 
     /**
      * Handles the cancel button by closing the overlay.
      * @private
      */
     handleCancel_: function() {
+      this.willCancel();
       OptionsPage.closeOverlay();
 
       var els = this.pageDiv.querySelectorAll('[dialog-pref]');
       for (var i = 0; i < els.length; i++) {
         if (els[i].resetPrefState)
           els[i].resetPrefState();
       }
     },
+
+    /**
+     * Called when the user clicks the confirm button, just before the
+     * preferences are saved. This is a no-op, but subclasses can override it.
+     */
+    willConfirm: function() {},
+
+    /**
+     * Called when the user cancels the dialog, just before the
+     * dialog is closed. This is a no-op, but subclasses can override it.
+     */
+    willCancel: function() {},
   };
 
   return {
     SettingsDialog: SettingsDialog
   };
 });