Improve documentation for special-purpose policy providers.

components/components_tests.gyp

 # 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.
 
 {
   'variables': {
     # This turns on e.g. the filename-based detection of which
     # platforms to include source files on (e.g. files ending in
     # _mac.h or _mac.cc are only compiled on MacOSX).
     'chromium_code': 1,
@@ skipping 827 matching lines @@
                 'policy/core/common/cloud/device_management_service_unittest.cc',
                 'policy/core/common/cloud/external_policy_data_fetcher_unittest.cc',
                 'policy/core/common/cloud/external_policy_data_updater_unittest.cc',
                 'policy/core/common/cloud/policy_header_io_helper_unittest.cc',
                 'policy/core/common/cloud/policy_header_service_unittest.cc',
                 'policy/core/common/cloud/resource_cache_unittest.cc',
                 'policy/core/common/cloud/user_cloud_policy_manager_unittest.cc',
                 'policy/core/common/cloud/user_cloud_policy_store_unittest.cc',
                 'policy/core/common/cloud/user_info_fetcher_unittest.cc',
                 'policy/core/common/config_dir_policy_loader_unittest.cc',
-                'policy/core/common/forwarding_policy_provider_unittest.cc',
                 'policy/core/common/generate_policy_source_unittest.cc',
                 'policy/core/common/policy_bundle_unittest.cc',
                 'policy/core/common/policy_loader_ios_unittest.mm',
                 'policy/core/common/policy_loader_mac_unittest.cc',
                 'policy/core/common/policy_loader_win_unittest.cc',
                 'policy/core/common/policy_map_unittest.cc',
                 'policy/core/common/policy_provider_android_unittest.cc',
                 'policy/core/common/policy_service_impl_unittest.cc',
                 'policy/core/common/policy_statistics_collector_unittest.cc',
                 'policy/core/common/preg_parser_win_unittest.cc',
                 'policy/core/common/registry_dict_win_unittest.cc',
                 'policy/core/common/schema_map_unittest.cc',
+                'policy/core/common/schema_registry_tracking_policy_provider_unittest.cc',
                 'policy/core/common/schema_registry_unittest.cc',
                 'policy/core/common/schema_unittest.cc',
                 'search_engines/default_search_policy_handler_unittest.cc',
               ],
               'conditions': [
                 ['OS=="android"', {
                   'sources/': [
                     ['exclude', '^policy/core/common/async_policy_provider_unittest\\.cc'],
                   ],
                 }],
@@ skipping 193 matching lines @@
               'dependencies': [
                 '../base/allocator/allocator.gyp:allocator',
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }