Adds a mock for component_updater::ComponentUpdateService

components/component_updater.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/component_updater
       'target_name': 'component_updater',
       'type': 'static_library',
@@ skipping 20 matching lines @@
         'component_updater/configurator_impl.cc',
         'component_updater/configurator_impl.h',
         'component_updater/default_component_installer.cc',
         'component_updater/default_component_installer.h',
         'component_updater/pref_names.cc',
         'component_updater/pref_names.h',
         'component_updater/timer.cc',
         'component_updater/timer.h',
       ],
     },
+    {
+      # GN version: //components/component_updater:test_support
+      'target_name': 'component_updater_test_support',
+      'type': 'static_library',
+      'dependencies': [
+        'component_updater',
+        '../testing/gmock.gyp:gmock',
+      ],
+      'include_dirs': [
+        '..',
+      ],
+      'sources': [
+        'component_updater/mock_component_updater_service.cc',
+        'component_updater/mock_component_updater_service.h',
+      ],
+    },
   ],
 }