Reland of Pass SequencedTaskRunner to PowerSaveBlocker for ui/file ops

content/content_browser.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.
 
 {
   'dependencies': [
     '../base/base.gyp:base_static',
     '../cc/cc.gyp:cc',
     '../cc/cc.gyp:cc_surfaces',
     '../components/components.gyp:display_compositor',
@@ skipping 236 matching lines @@
       'public/browser/page_navigator.h',
       'public/browser/pepper_flash_settings_helper.h',
       'public/browser/permission_manager.h',
       'public/browser/permission_type.h',
       'public/browser/platform_notification_context.h',
       'public/browser/platform_notification_service.h',
       'public/browser/plugin_data_remover.h',
       'public/browser/plugin_service.h',
       'public/browser/plugin_service_filter.h',
       'public/browser/power_save_blocker.h',
+      'public/browser/power_save_blocker_factory.h',
       'public/browser/presentation_screen_availability_listener.h',
       'public/browser/presentation_service_delegate.h',
       'public/browser/presentation_session.cc',
       'public/browser/presentation_session.h',
       'public/browser/presentation_session_message.cc',
       'public/browser/presentation_session_message.h',
       'public/browser/profiler_controller.h',
       'public/browser/profiler_subscriber.h',
       'public/browser/push_messaging_service.cc',
       'public/browser/push_messaging_service.h',
@@ skipping 899 matching lines @@
       'browser/notifications/type_converters.cc',
       'browser/notifications/type_converters.h',
       'browser/permissions/permission_service_context.cc',
       'browser/permissions/permission_service_context.h',
       'browser/permissions/permission_service_impl.cc',
       'browser/permissions/permission_service_impl.h',
       'browser/power_monitor_message_broadcaster.cc',
       'browser/power_monitor_message_broadcaster.h',
       'browser/power_save_blocker_android.h',
       'browser/power_save_blocker_chromeos.cc',
+      'browser/power_save_blocker_factory.cc',
       'browser/power_save_blocker_impl.cc',
       'browser/power_save_blocker_impl.h',
       'browser/power_save_blocker_mac.cc',
       'browser/power_save_blocker_ozone.cc',
       'browser/power_save_blocker_win.cc',
       'browser/power_save_blocker_x11.cc',
       'browser/power_usage_monitor_impl.cc',
       'browser/power_usage_monitor_impl.h',
       'browser/presentation/presentation_service_impl.cc',
       'browser/presentation/presentation_service_impl.h',
@@ skipping 1013 matching lines @@
       ],
     }],
     ['OS != "mac" and OS != "android"', {
       'sources!': [
         'browser/gpu/gpu_surface_tracker.cc',
         'browser/gpu/gpu_surface_tracker.h',
       ],
     }],
   ],
 }