Introduce a SchedulerHelper in content/child/scheduler

content/renderer/scheduler/renderer_scheduler_message_loop_delegate.cc

-// Copyright 2015 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.
-
-#include "content/renderer/scheduler/renderer_scheduler_message_loop_delegate.h"
-
-namespace content {
-
-// static
-scoped_refptr<RendererSchedulerMessageLoopDelegate>
-RendererSchedulerMessageLoopDelegate::Create(base::MessageLoop* message_loop) {
-  return make_scoped_refptr(
-      new RendererSchedulerMessageLoopDelegate(message_loop));
-}
-
-RendererSchedulerMessageLoopDelegate::RendererSchedulerMessageLoopDelegate(
-    base::MessageLoop* message_loop)
-    : message_loop_(message_loop) {
-}
-
-RendererSchedulerMessageLoopDelegate::~RendererSchedulerMessageLoopDelegate() {
-}
-
-bool RendererSchedulerMessageLoopDelegate::PostDelayedTask(
-    const tracked_objects::Location& from_here,
-    const base::Closure& task,
-    base::TimeDelta delay) {
-  return message_loop_->task_runner()->PostDelayedTask(from_here, task, delay);
-}
-
-bool RendererSchedulerMessageLoopDelegate::PostNonNestableDelayedTask(
-    const tracked_objects::Location& from_here,
-    const base::Closure& task,
-    base::TimeDelta delay) {
-  return message_loop_->task_runner()->PostNonNestableDelayedTask(from_here,
-                                                                  task, delay);
-}
-
-bool RendererSchedulerMessageLoopDelegate::RunsTasksOnCurrentThread() const {
-  return message_loop_->task_runner()->RunsTasksOnCurrentThread();
-}
-
-bool RendererSchedulerMessageLoopDelegate::IsNested() const {
-  return message_loop_->IsNested();
-}
-
-}  // namespace content