Add a dropdown to change the default content setting to the Website Settings page.

chrome/browser/resources/options/website_settings_edit_page.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.
 
 cr.define('options.WebsiteSettings', function() {
   /** @const */ var Page = cr.ui.pageManager.Page;
 
   /////////////////////////////////////////////////////////////////////////////
   // WebsiteSettingsEditor class:
 
@@ skipping 137 matching lines @@
   };
 
   WebsiteSettingsEditor.populateOrigin = function(localStorage, batteryUsage,
       permissions, showPage) {
     WebsiteSettingsEditor.getInstance().populateOrigin_(localStorage,
                                                         batteryUsage,
                                                         permissions,
                                                         showPage);
   };
 
+  WebsiteSettingsEditor.showEditPage = function(url) {
+    WebsiteSettingsEditor.getInstance().populatePage(url);
+  };
+
   // Export
   return {
     WebsiteSettingsEditor: WebsiteSettingsEditor
   };
 
 });