[MD Bookmarks] Add import/export bookmarks HTML features

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': 'app',
       'dependencies': [
         '<(EXTERNS_GYP):chrome_extensions',
         'store'
@@ skipping 44 matching lines @@
         '<(EXTERNS_GYP):chrome_extensions',
         'router',
       ],
       'includes': ['../../../../third_party/closure_compiler/compile_js2.gypi']
     },
     {
       'target_name': 'toolbar',
       'dependencies': [
         '<(DEPTH)/ui/webui/resources/cr_elements/cr_action_menu/compiled_resources2.gyp:cr_action_menu',
         '<(DEPTH)/ui/webui/resources/cr_elements/cr_toolbar/compiled_resources2.gyp:cr_toolbar',
+        '<(EXTERNS_GYP):chrome_extensions',
       ],
       'includes': ['../../../../third_party/closure_compiler/compile_js2.gypi'],
     },
   ]
 }