scheduler: Implement WebFrameScheduler and WebPageScheduler

third_party/WebKit/Source/platform/Timer.h

 /*
  * Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 61 matching lines @@
 
     void didChangeAlignmentInterval(double now);
 
     struct PLATFORM_EXPORT Comparator {
         bool operator()(const TimerBase* a, const TimerBase* b) const;
     };
 
 private:
     virtual void fired() = 0;
 
+    virtual WebTaskRunner* timerTaskRunner();
+
     NO_LAZY_SWEEP_SANITIZE_ADDRESS
     virtual bool canFire() const { return true; }
 
     virtual double alignedFireTime(double fireTime) const { return fireTime; }
 
     void setNextFireTime(double now, double delay);
 
     void runInternal();
 
     class CancellableTimerTask final : public WebTaskRunner::Task {
@@ skipping 94 matching lines @@
 NO_LAZY_SWEEP_SANITIZE_ADDRESS
 inline bool TimerBase::isActive() const
 {
     ASSERT(m_thread == currentThread());
     return m_cancellableTimerTask;
 }
 
 } // namespace blink
 
 #endif // Timer_h