Move blink scheduler implementation into a component

content/child/scheduler/null_idle_task_runner.cc

-// Copyright 2014 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/child/scheduler/null_idle_task_runner.h"
-
-namespace content {
-
-NullIdleTaskRunner::NullIdleTaskRunner()
-    : SingleThreadIdleTaskRunner(nullptr,
-                                 nullptr,
-                                 base::Callback<void(base::TimeTicks*)>(),
-                                 "null.taskrunner") {
-}
-
-NullIdleTaskRunner::~NullIdleTaskRunner() {
-}
-
-void NullIdleTaskRunner::PostIdleTask(
-    const tracked_objects::Location& from_here,
-    const IdleTask& idle_task) {
-}
-
-void NullIdleTaskRunner::PostNonNestableIdleTask(
-    const tracked_objects::Location& from_here,
-    const IdleTask& idle_task) {
-}
-
-void NullIdleTaskRunner::PostIdleTaskAfterWakeup(
-  const tracked_objects::Location& from_here,
-  const IdleTask& idle_task) {
-}
-
-}  // namespace content