scheduler: Move the Blink scheduler into Blink

components/scheduler/base/queueing_time_estimator.h

-// Copyright 2016 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_RENDERER_QUEUEING_TIME_ESTIMATOR_H_
-#define COMPONENTS_SCHEDULER_RENDERER_QUEUEING_TIME_ESTIMATOR_H_
-
-#include "base/macros.h"
-#include "base/message_loop/message_loop.h"
-#include "base/time/time.h"
-#include "components/scheduler/scheduler_export.h"
-
-namespace base {
-class TickClock;
-}
-
-namespace scheduler {
-
-// Records the expected queueing time for a high priority task occurring
-// randomly during each interval of length |window_duration|.
-class SCHEDULER_EXPORT QueueingTimeEstimator {
- public:
-  class SCHEDULER_EXPORT Client {
-   public:
-    virtual void OnQueueingTimeForWindowEstimated(
-        base::TimeDelta queueing_time) = 0;
-    Client() {}
-    virtual ~Client() {}
-
-   private:
-    DISALLOW_COPY_AND_ASSIGN(Client);
-  };
-
-  QueueingTimeEstimator(Client* client,
-                        base::TimeDelta window_duration);
-
-  void OnToplevelTaskCompleted(base::TimeTicks task_start_time,
-                               base::TimeTicks task_end_time);
-
- private:
-  bool TimePastWindowEnd(base::TimeTicks task_end_time);
-  Client* client_;  // NOT OWNED.
-
-  base::TimeDelta current_expected_queueing_time_;
-  base::TimeDelta window_duration_;
-  base::TimeTicks window_start_time_;
-
-  DISALLOW_COPY_AND_ASSIGN(QueueingTimeEstimator);
-};
-
-}  // namespace scheduler
-
-#endif  // COMPONENTS_SCHEDULER_RENDERER_QUEUEING_TIME_ESTIMATOR_H_