Introduce a SchedulerHelper in content/child/scheduler

content/content_renderer.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',
     '../base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
     '../cc/cc.gyp:cc',
     '../cc/blink/cc_blink.gyp:cc_blink',
@@ skipping 347 matching lines @@
       'renderer/renderer_webcolorchooser_impl.cc',
       'renderer/renderer_webcolorchooser_impl.h',
       'renderer/renderer_webcookiejar_impl.cc',
       'renderer/renderer_webcookiejar_impl.h',
       'renderer/resizing_mode_selector.cc',
       'renderer/resizing_mode_selector.h',
       'renderer/sad_plugin.cc',
       'renderer/sad_plugin.h',
       'renderer/savable_resources.cc',
       'renderer/savable_resources.h',
-      'renderer/scheduler/cancelable_closure_holder.cc',
-      'renderer/scheduler/cancelable_closure_holder.h',
       'renderer/scheduler/deadline_task_runner.cc',
       'renderer/scheduler/deadline_task_runner.h',
-      'renderer/scheduler/nestable_single_thread_task_runner.h',
       'renderer/scheduler/null_renderer_scheduler.cc',
       'renderer/scheduler/null_renderer_scheduler.h',
       'renderer/scheduler/renderer_scheduler.cc',
       'renderer/scheduler/renderer_scheduler.h',
       'renderer/scheduler/renderer_scheduler_impl.cc',
       'renderer/scheduler/renderer_scheduler_impl.h',
-      'renderer/scheduler/renderer_scheduler_message_loop_delegate.cc',
-      'renderer/scheduler/renderer_scheduler_message_loop_delegate.h',
-      'renderer/scheduler/renderer_task_queue_selector.cc',
-      'renderer/scheduler/renderer_task_queue_selector.h',
       'renderer/scheduler/resource_dispatch_throttler.cc',
       'renderer/scheduler/resource_dispatch_throttler.h',
-      'renderer/scheduler/single_thread_idle_task_runner.cc',
-      'renderer/scheduler/single_thread_idle_task_runner.h',
-      'renderer/scheduler/task_queue_manager.cc',
-      'renderer/scheduler/task_queue_manager.h',
-      'renderer/scheduler/task_queue_selector.h',
       'renderer/scheduler/web_scheduler_impl.cc',
       'renderer/scheduler/web_scheduler_impl.h',
       'renderer/scheduler/webthread_impl_for_scheduler.cc',
       'renderer/scheduler/webthread_impl_for_scheduler.h',
       'renderer/screen_orientation/screen_orientation_dispatcher.cc',
       'renderer/screen_orientation/screen_orientation_dispatcher.h',
       'renderer/screen_orientation/screen_orientation_observer.cc',
       'renderer/screen_orientation/screen_orientation_observer.h',
       'renderer/service_worker/cache_storage_message_filter.cc',
       'renderer/service_worker/cache_storage_message_filter.h',
@@ skipping 479 matching lines @@
     }],
   ],
   'target_conditions': [
     ['OS=="android"', {
       'sources/': [
         ['include', '^renderer/render_view_linux\\.cc$'],
       ],
     }],
   ],
 }