Implement a background downloader using BITS in Windows Chrome.

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 402 matching lines @@
         'browser/chrome_process_singleton.cc',
         'browser/chrome_process_singleton.h',
         'browser/chrome_quota_permission_context.cc',
         'browser/chrome_quota_permission_context.h',
         'browser/command_observer.h',
         'browser/command_updater.cc',
         'browser/command_updater.h',
         'browser/command_updater_delegate.h',
         'browser/common/cancelable_request.cc',
         'browser/common/cancelable_request.h',
+        'browser/component_updater/background_downloader_win.cc',
+        'browser/component_updater/background_downloader_win.h',
         'browser/component_updater/component_patcher.cc',
         'browser/component_updater/component_patcher.h',
         'browser/component_updater/component_patcher_operation.cc',
         'browser/component_updater/component_patcher_operation.h',
         'browser/component_updater/component_patcher_win.cc',
         'browser/component_updater/component_patcher_win.h',
         'browser/component_updater/component_updater_configurator.cc',
         'browser/component_updater/component_updater_configurator.h',
         'browser/component_updater/component_unpacker.cc',
         'browser/component_updater/component_unpacker.h',
-        'browser/component_updater/update_response.cc',
-        'browser/component_updater/update_response.h',
         'browser/component_updater/component_updater_ping_manager.cc',
         'browser/component_updater/component_updater_ping_manager.h',
         'browser/component_updater/component_updater_service.cc',
         'browser/component_updater/component_updater_service.h',
         'browser/component_updater/component_updater_utils.cc',
         'browser/component_updater/component_updater_utils.h',
         'browser/component_updater/crx_update_item.h',
         'browser/component_updater/crx_downloader.cc',
         'browser/component_updater/crx_downloader.h',
         'browser/component_updater/default_component_installer.cc',
         'browser/component_updater/default_component_installer.h',
         'browser/component_updater/flash_component_installer.h',
         'browser/component_updater/pepper_flash_component_installer.cc',
         'browser/component_updater/pnacl/pnacl_component_installer.cc',
         'browser/component_updater/pnacl/pnacl_component_installer.h',
         'browser/component_updater/pnacl/pnacl_profile_observer.cc',
         'browser/component_updater/pnacl/pnacl_profile_observer.h',
         'browser/component_updater/ppapi_utils.cc',
         'browser/component_updater/ppapi_utils.h',
         'browser/component_updater/recovery_component_installer.cc',
         'browser/component_updater/recovery_component_installer.h',
         'browser/component_updater/swiftshader_component_installer.cc',
         'browser/component_updater/swiftshader_component_installer.h',
+        'browser/component_updater/update_response.cc',
+        'browser/component_updater/update_response.h',
         'browser/component_updater/url_fetcher_downloader.cc',
         'browser/component_updater/url_fetcher_downloader.h',
         'browser/component_updater/widevine_cdm_component_installer.cc',
         'browser/component_updater/widevine_cdm_component_installer.h',
         'browser/content_settings/content_settings_default_provider.cc',
         'browser/content_settings/content_settings_default_provider.h',
         'browser/content_settings/content_settings_details.cc',
         'browser/content_settings/content_settings_details.h',
         'browser/content_settings/content_settings_custom_extension_provider.cc',
         'browser/content_settings/content_settings_custom_extension_provider.h',
@@ skipping 3265 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' ],
         },
       ],
      },
     ],
   ],
 }