scheduler: Move the Blink scheduler into Blink

components/scheduler/child/webthread_base.h

-// 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.
-
-#ifndef COMPONENTS_SCHEDULER_CHILD_WEBTHREAD_BASE_H_
-#define COMPONENTS_SCHEDULER_CHILD_WEBTHREAD_BASE_H_
-
-#include <map>
-#include <memory>
-
-#include "base/threading/thread.h"
-#include "components/scheduler/scheduler_export.h"
-#include "third_party/WebKit/public/platform/WebThread.h"
-
-namespace blink {
-class WebTraceLocation;
-}
-
-namespace scheduler {
-class SingleThreadIdleTaskRunner;
-
-class SCHEDULER_EXPORT WebThreadBase : public blink::WebThread {
- public:
-  ~WebThreadBase() override;
-
-  // blink::WebThread implementation.
-  bool isCurrentThread() const override;
-  blink::PlatformThreadId threadId() const override = 0;
-
-  virtual void postIdleTask(const blink::WebTraceLocation& location,
-                            IdleTask* idle_task);
-  virtual void postIdleTaskAfterWakeup(const blink::WebTraceLocation& location,
-                                       IdleTask* idle_task);
-
-  void addTaskObserver(TaskObserver* observer) override;
-  void removeTaskObserver(TaskObserver* observer) override;
-
-  // Returns the base::Bind-compatible task runner for posting tasks to this
-  // thread. Can be called from any thread.
-  virtual base::SingleThreadTaskRunner* GetTaskRunner() const = 0;
-
-  // Returns the base::Bind-compatible task runner for posting idle tasks to
-  // this thread. Can be called from any thread.
-  virtual scheduler::SingleThreadIdleTaskRunner* GetIdleTaskRunner() const = 0;
-
- protected:
-  class TaskObserverAdapter;
-
-  WebThreadBase();
-
-  virtual void AddTaskObserverInternal(
-      base::MessageLoop::TaskObserver* observer);
-  virtual void RemoveTaskObserverInternal(
-      base::MessageLoop::TaskObserver* observer);
-
-  static void RunWebThreadIdleTask(
-      std::unique_ptr<blink::WebThread::IdleTask> idle_task,
-      base::TimeTicks deadline);
-
- private:
-  typedef std::map<TaskObserver*, TaskObserverAdapter*> TaskObserverMap;
-  TaskObserverMap task_observer_map_;
-};
-
-}  // namespace scheduler
-
-#endif  // COMPONENTS_SCHEDULER_CHILD_WEBTHREAD_BASE_H_