Move blink scheduler implementation into a component

content/child/scheduler/webthread_impl_for_worker_scheduler.h

-// 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.
-
-#ifndef CONTENT_CHILD_SCHEDULER_WEBTHREAD_IMPL_FOR_WORKER_SCHEDULER_H_
-#define CONTENT_CHILD_SCHEDULER_WEBTHREAD_IMPL_FOR_WORKER_SCHEDULER_H_
-
-#include "content/child/scheduler/task_queue_manager.h"
-#include "content/child/webthread_base.h"
-
-namespace base {
-class WaitableEvent;
-};
-
-namespace blink {
-class WebScheduler;
-};
-
-namespace content {
-
-class SingleThreadIdleTaskRunner;
-class WebSchedulerImpl;
-class WorkerScheduler;
-
-class CONTENT_EXPORT WebThreadImplForWorkerScheduler : public WebThreadBase {
- public:
-  explicit WebThreadImplForWorkerScheduler(const char* name);
-  virtual ~WebThreadImplForWorkerScheduler();
-
-  // blink::WebThread implementation.
-  virtual blink::WebScheduler* scheduler() const;
-  blink::PlatformThreadId threadId() const override;
-
-  // WebThreadBase implementation.
-  base::SingleThreadTaskRunner* TaskRunner() const override;
-  SingleThreadIdleTaskRunner* IdleTaskRunner() const override;
-
- private:
-  base::MessageLoop* MessageLoop() const override;
-  void AddTaskObserverInternal(
-      base::MessageLoop::TaskObserver* observer) override;
-  void RemoveTaskObserverInternal(
-      base::MessageLoop::TaskObserver* observer) override;
-
-  void InitOnThread(base::WaitableEvent* completion);
-  void ShutDownOnThread(base::WaitableEvent* completion);
-
-  scoped_ptr<base::Thread> thread_;
-  scoped_ptr<WorkerScheduler> worker_scheduler_;
-  scoped_ptr<WebSchedulerImpl> web_scheduler_;
-  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
-  scoped_refptr<SingleThreadIdleTaskRunner> idle_task_runner_;
-};
-
-}  // namespace content
-
-#endif  // CONTENT_CHILD_SCHEDULER_WEBTHREAD_IMPL_FOR_WORKER_SCHEDULER_H_