[MD Extensions] Add a details subpage, move to one list

chrome/browser/resources/md_extensions/item.js

 // Copyright 2015 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() {
   /** @interface */
   var ItemDelegate = function() {};
 
   ItemDelegate.prototype = {
     /** @param {string} id */
@@ skipping 79 matching lines @@
       this.delegate.deleteItem(this.data.id);
     },
 
     /** @private */
     onEnableChange_: function() {
       this.delegate.setItemEnabled(this.data.id, this.$.enabled.checked);
     },
 
     /** @private */
     onDetailsTap_: function() {
+      this.fire('extension-item-will-show-details', {element: this});
       this.delegate.showItemDetails(this.data.id);
     },
 
     /** @private */
     onAllowIncognitoChange_: function() {
       this.delegate.setItemAllowedIncognito(
           this.data.id, this.$$('#allow-incognito').checked);
     },
 
     /**
@@ skipping 74 matching lines @@
       return this.data.blacklistText ? 'severe' : 'mild';
     },
   });
 
   return {
     Item: Item,
     ItemDelegate: ItemDelegate,
   };
 });