FileManager: Add thumbnail view.

chrome/browser/resources/shared/js/cr/ui/list.js

 // Copyright (c) 2011 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.
 
 // require: array_data_model.js
 // require: list_selection_model.js
 // require: list_selection_controller.js
 // require: list_item.js
 
 /**
@@ skipping 670 matching lines @@
     },
 
     /**
      * Creates a new list item.
      * @param {*} value The value to use for the item.
      * @return {!ListItem} The newly created list item.
      */
     createItem: function(value) {
       var item = new this.itemConstructor_(value);
       item.label = value;
-      item.decorate();
+      if (typeof item.decorate == 'function')
+        item.decorate();
       return item;
     },
 
     /**
      * Creates the selection controller to use internally.
      * @param {cr.ui.ListSelectionModel} sm The underlying selection model.
      * @return {!cr.ui.ListSelectionController} The newly created selection
      *     controller.
      */
     createSelectionController: function(sm) {
@@ skipping 229 matching lines @@
    * because list items can contain controls that can be focused, and for some
    * purposes (e.g., styling), the list can still be conceptually focused at
    * that point even though it doesn't actually have the page focus.
    */
   cr.defineProperty(List, 'hasElementFocus', cr.PropertyKind.BOOL_ATTR);
 
   return {
     List: List
   }
 });