scheduler: Move the Blink scheduler into Blink

components/scheduler/base/virtual_time_domain.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 COMPONENTS_SCHEDULER_BASE_VIRTUAL_TIME_DOMAIN_H_
-#define COMPONENTS_SCHEDULER_BASE_VIRTUAL_TIME_DOMAIN_H_
-
-#include "base/callback.h"
-#include "base/macros.h"
-#include "components/scheduler/base/time_domain.h"
-#include "components/scheduler/scheduler_export.h"
-
-namespace scheduler {
-
-class SCHEDULER_EXPORT VirtualTimeDomain : public TimeDomain {
- public:
-  VirtualTimeDomain(TimeDomain::Observer* observer,
-                    base::TimeTicks initial_time);
-  ~VirtualTimeDomain() override;
-
-  // TimeDomain implementation:
-  LazyNow CreateLazyNow() const override;
-  base::TimeTicks Now() const override;
-  bool MaybeAdvanceTime() override;
-  const char* GetName() const override;
-
-  // Advances this time domain to |now|. NOTE |now| is supposed to be
-  // monotonically increasing.  NOTE it's the responsibility of the caller to
-  // call TaskQueueManager::MaybeScheduleImmediateWork if needed.
-  void AdvanceTo(base::TimeTicks now);
-
-  using TimeDomain::ClearExpiredWakeups;
-
- protected:
-  void OnRegisterWithTaskQueueManager(
-      TaskQueueManager* task_queue_manager) override;
-  void RequestWakeup(base::TimeTicks now, base::TimeDelta delay) override;
-  void AsValueIntoInternal(
-      base::trace_event::TracedValue* state) const override;
-
-  void RequestDoWork();
-
- private:
-  mutable base::Lock lock_;  // Protects |now_|.
-  base::TimeTicks now_;
-
-  TaskQueueManager* task_queue_manager_;  // NOT OWNED
-  base::Closure do_work_closure_;
-
-  DISALLOW_COPY_AND_ASSIGN(VirtualTimeDomain);
-};
-
-}  // namespace scheduler
-
-#endif  // COMPONENTS_SCHEDULER_BASE_VIRTUAL_TIME_DOMAIN_H_