Add ArcEnabled policy implementation

chrome/chrome_tests.gypi

 # Copyright 2013 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.
 {
   'variables': {
     'chrome_browser_extensions_test_support_sources': [
       # A list of sources which is shared between different browser tests.
       'browser/apps/app_browsertest_util.cc',
       'browser/apps/app_browsertest_util.h',
       'browser/extensions/browsertest_util.cc',
@@ skipping 2574 matching lines @@
           'sources!': [
             # TODO(dbeam): log webui URLs on iOS and test them.
             'browser/ui/webui/log_web_ui_url_browsertest.cc',
           ],
         }],
         ['OS!="android" and OS!="ios"', {
           'sources': [
             'browser/copresence/chrome_whispernet_client_browsertest.cc',
           ],
           'dependencies': [
+            '../components/components.gyp:arc_test_support',
             '../components/components.gyp:copresence',
             # build time dependency.
             '../v8/src/d8.gyp:d8#host',
           ],
         }],
         ['enable_app_list==1', {
           'sources': [ '<@(chrome_browser_tests_app_list_sources)' ],
         }, {
           'sources!': [ 'browser/ui/webui/app_list/start_page_browsertest.js' ],
         }],
@@ skipping 918 matching lines @@
             'browser',
           ],
           'sources': [
             'tools/service_discovery_sniffer/service_discovery_sniffer.cc',
             'tools/service_discovery_sniffer/service_discovery_sniffer.h',
           ],
         }]
     }],
   ],  # 'conditions'
 }