[MD Extensions] Add support for URL navigation

chrome/browser/resources/md_extensions/options_dialog.js

 // Copyright 2016 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('extensions', function() {
   'use strict';
 
   var MAX_HEIGHT = 600;
   var MAX_WIDTH = 600;
   var MIN_HEIGHT = 300;
   var MIN_WIDTH = 300;
   var HEADER_PADDING = 40;
 
   var OptionsDialog = Polymer({
     is: 'extensions-options-dialog',
     properties: {
       /** @private {Object} */
       extensionOptions_: Object,
 
       /** @private {chrome.developerPrivate.ExtensionInfo} */
       data_: Object,
     },
 
+    get open() {
+      return this.$$('dialog').open;
+    },
+
     /** @param {chrome.developerPrivate.ExtensionInfo} data */
     show: function(data) {
       this.data_ = data;
       if (!this.extensionOptions_)
         this.extensionOptions_ = document.createElement('ExtensionOptions');
       this.extensionOptions_.extension = this.data_.id;
       this.extensionOptions_.onclose = this.close.bind(this);
       var bounded = function(min, max, val) {
         return Math.min(Math.max(min, val), max);
       };
@@ skipping 16 matching lines @@
       onSizeChanged({height: 0, width: 0});
     },
 
     close: function() {
       this.$$('dialog').close();
     },
   });
 
   return {OptionsDialog: OptionsDialog};
 });