Introduce a SchedulerHelper in content/child/scheduler

content/renderer/scheduler/nestable_task_runner_for_test.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/nestable_task_runner_for_test.h"
-
-namespace content {
-
-// static
-scoped_refptr<NestableTaskRunnerForTest> NestableTaskRunnerForTest::Create(
-    scoped_refptr<base::SingleThreadTaskRunner> task_runner) {
-  return make_scoped_refptr(new NestableTaskRunnerForTest(task_runner));
-}
-
-NestableTaskRunnerForTest::NestableTaskRunnerForTest(
-    scoped_refptr<base::SingleThreadTaskRunner> task_runner)
-    : task_runner_(task_runner), is_nested_(false) {
-}
-
-NestableTaskRunnerForTest::~NestableTaskRunnerForTest() {
-}
-
-bool NestableTaskRunnerForTest::PostDelayedTask(
-    const tracked_objects::Location& from_here,
-    const base::Closure& task,
-    base::TimeDelta delay) {
-  return task_runner_->PostDelayedTask(from_here, task, delay);
-}
-
-bool NestableTaskRunnerForTest::PostNonNestableDelayedTask(
-    const tracked_objects::Location& from_here,
-    const base::Closure& task,
-    base::TimeDelta delay) {
-  return task_runner_->PostNonNestableDelayedTask(from_here, task, delay);
-}
-
-bool NestableTaskRunnerForTest::RunsTasksOnCurrentThread() const {
-  return task_runner_->RunsTasksOnCurrentThread();
-}
-
-bool NestableTaskRunnerForTest::IsNested() const {
-  return is_nested_;
-}
-
-void NestableTaskRunnerForTest::SetNested(bool is_nested) {
-  is_nested_ = is_nested;
-}
-
-}  // namespace content