Implement fetching, caching and retrieval of external policy data

chrome/chrome_browser.gypi

 # Copyright 2012 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': 'browser',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 1287 matching lines @@
         'browser/plugins/plugin_status_pref_setter.cc',
         'browser/plugins/plugin_status_pref_setter.h',
         'browser/policy/async_policy_loader.cc',
         'browser/policy/async_policy_loader.h',
         'browser/policy/async_policy_provider.cc',
         'browser/policy/async_policy_provider.h',
         'browser/policy/browser_policy_connector.cc',
         'browser/policy/browser_policy_connector.h',
         'browser/policy/cloud/cloud_external_data_manager.cc',
         'browser/policy/cloud/cloud_external_data_manager.h',
+        'browser/policy/cloud/cloud_external_data_manager_base.cc',
+        'browser/policy/cloud/cloud_external_data_manager_base.h',
         'browser/policy/cloud/cloud_external_data_store.cc',
         'browser/policy/cloud/cloud_external_data_store.h',
         'browser/policy/cloud/cloud_policy_client.cc',
         'browser/policy/cloud/cloud_policy_client.h',
         'browser/policy/cloud/cloud_policy_client_registration_helper.cc',
         'browser/policy/cloud/cloud_policy_client_registration_helper.h',
         'browser/policy/cloud/cloud_policy_constants.cc',
         'browser/policy/cloud/cloud_policy_constants.h',
         'browser/policy/cloud/cloud_policy_core.cc',
         'browser/policy/cloud/cloud_policy_core.h',
@@ skipping 2020 matching lines @@
             'package_name': 'org/chromium/chrome/browser/ui/toolbar',
             'template_deps': ['browser/ui/toolbar/toolbar_model_security_level_list.h'],
           },
           'includes': [ '../build/android/java_cpp_template.gypi' ],
         },
       ],
      },
     ],
   ],
 }