[MD Bookmarks] Fix offscreen menu button activation.

chrome/browser/resources/md_bookmarks/compiled_resources2.gyp

 # 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.
 {
   'targets': [
     {
       'target_name': 'actions',
       'dependencies': [
         '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:cr',
         '<(EXTERNS_GYP):chrome_extensions',
@@ skipping 92 matching lines @@
       ],
       'includes': ['../../../../third_party/closure_compiler/compile_js2.gypi'],
     },
     {
       'target_name': 'list',
       'dependencies': [
         '<(DEPTH)/third_party/polymer/v1_0/components-chromium/iron-list/compiled_resources2.gyp:iron-list-extracted',
         '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:load_time_data',
         'actions',
         'command_manager',
+        'item',
         'store_client',
       ],
       'includes': ['../../../../third_party/closure_compiler/compile_js2.gypi'],
     },
     {
       'target_name': 'mouse_focus_behavior',
       'dependencies': [
         '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:cr',
       ],
       'includes': ['../../../../third_party/closure_compiler/compile_js2.gypi'],
@@ skipping 76 matching lines @@
       'target_name': 'util',
       'dependencies': [
         '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:cr',
         '<(EXTERNS_GYP):chrome_extensions',
         'types',
       ],
       'includes': ['../../../../third_party/closure_compiler/compile_js2.gypi']
     }
   ]
 }