BookmarkClient can add extra nodes to BookmarkModel.

components/bookmarks.gypi

 # Copyright 2014 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': 'bookmarks_browser',
       'type': 'static_library',
       'include_dirs': [
@@ skipping 36 matching lines @@
         'bookmarks/browser/bookmark_node_data_ios.cc',
         'bookmarks/browser/bookmark_node_data_mac.cc',
         'bookmarks/browser/bookmark_node_data_views.cc',
         'bookmarks/browser/bookmark_pasteboard_helper_mac.h',
         'bookmarks/browser/bookmark_pasteboard_helper_mac.mm',
         'bookmarks/browser/bookmark_service.h',
         'bookmarks/browser/bookmark_storage.cc',
         'bookmarks/browser/bookmark_storage.h',
         'bookmarks/browser/bookmark_utils.cc',
         'bookmarks/browser/bookmark_utils.h',
+        'bookmarks/browser/managed_bookmarks_tracker.cc',
+        'bookmarks/browser/managed_bookmarks_tracker.h',
         'bookmarks/browser/scoped_group_bookmark_actions.cc',
         'bookmarks/browser/scoped_group_bookmark_actions.h',
       ],
     },
     {
       'target_name': 'bookmarks_common',
       'type': 'static_library',
       'include_dirs': [
         '..',
       ],
@@ skipping 28 matching lines @@
       'conditions': [
         ['use_x11==1', {
           'dependencies': [
             '../ui/events/platform/x11/x11_events_platform.gyp:x11_events_platform',
           ],
         }],
       ],
     },
   ],
 }