Add ManagedModePolicyProvider and extension API to get and set policies.

chrome/chrome_tests.gypi

 # Copyright (c) 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.
 {
   'variables' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
       'common/pref_names.cc',
@@ skipping 1356 matching lines @@
         'browser/policy/configuration_policy_provider_test.h',
         'browser/policy/cros_user_policy_cache_unittest.cc',
         'browser/policy/device_management_service_unittest.cc',
         'browser/policy/device_policy_cache_unittest.cc',
         'browser/policy/device_status_collector_unittest.cc',
         'browser/policy/device_token_fetcher_unittest.cc',
         'browser/policy/enterprise_install_attributes_unittest.cc',
         'browser/policy/logging_work_scheduler.cc',
         'browser/policy/logging_work_scheduler.h',
         'browser/policy/logging_work_scheduler_unittest.cc',
+        'browser/policy/managed_mode_policy_provider_unittest.cc',
         'browser/policy/mock_cloud_policy_client.cc',
         'browser/policy/mock_cloud_policy_client.h',
         'browser/policy/mock_cloud_policy_store.cc',
         'browser/policy/mock_cloud_policy_store.h',
         'browser/policy/mock_configuration_policy_provider.cc',
         'browser/policy/mock_configuration_policy_provider.h',
         'browser/policy/mock_device_management_service.cc',
         'browser/policy/mock_device_management_service.h',
         'browser/policy/network_configuration_updater_unittest.cc',
         'browser/policy/policy_bundle_unittest.cc',
@@ skipping 3280 matching lines @@
               # Use outputs of this action as inputs for the main target build.
               # Seems as a misnomer but makes this happy on Linux (scons).
               'process_outputs_as_sources': 1,
             },
           ],  # 'actions'
         },
       ]
     }],  # 'coverage!=0'
   ],  # 'conditions'
 }