Add chrome test support target to GN build.

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': [
     {
+      # GN version: //components/bookmarks/browser
       'target_name': 'bookmarks_browser',
       'type': 'static_library',
       'include_dirs': [
         '..',
       ],
       'dependencies': [
         '../base/base.gyp:base',
         '../net/net.gyp:net',
         '../third_party/icu/icu.gyp:icuuc',
         '../ui/base/ui_base.gyp:ui_base',
@@ skipping 48 matching lines @@
             'bookmarks/common/android/bookmark_id.cc',
             'bookmarks/common/android/bookmark_id.h',
             'bookmarks/common/android/bookmark_type_list.h',
             'bookmarks/common/android/component_jni_registrar.cc',
             'bookmarks/common/android/component_jni_registrar.h',
           ],
         }],
       ],
     },
     {
+      # GN version: //components/bookmarks/common
       'target_name': 'bookmarks_common',
       'type': 'static_library',
       'include_dirs': [
         '..',
       ],
       'dependencies': [
         '../base/base.gyp:base',
       ],
       'sources': [
         'bookmarks/common/bookmark_constants.cc',
         'bookmarks/common/bookmark_constants.h',
         'bookmarks/common/bookmark_pref_names.cc',
         'bookmarks/common/bookmark_pref_names.h',
       ],
     },
     {
+      # GN version: //components/bookmarks/test
       'target_name': 'bookmarks_test_support',
       'type': 'static_library',
       'include_dirs': [
         '..',
       ],
       'dependencies': [
         '../base/base.gyp:base',
         '../testing/gmock.gyp:gmock',
         '../ui/events/platform/events_platform.gyp:events_platform',
         '../url/url.gyp:url_lib',
@@ skipping 51 matching lines @@
           'variables': {
             'package_name': 'org/chromium/components/bookmarks',
             'template_deps': ['bookmarks/common/android/bookmark_type_list.h'],
           },
           'includes': [ '../build/android/java_cpp_template.gypi' ],
         },
       ],
     }]
   ],
 }