Refactor Timer classes in preparation for landing FrameTimers.

third_party/WebKit/Source/core/timing/PerformanceBase.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2012 Intel 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 389 matching lines @@
     PerformanceObserverVector suspended;
     copyToVector(m_suspendedObservers, suspended);
     for (size_t i = 0; i < suspended.size(); ++i) {
         if (!suspended[i]->shouldBeSuspended()) {
             m_suspendedObservers.remove(suspended[i]);
             activateObserver(*suspended[i]);
         }
     }
 }
 
-void PerformanceBase::deliverObservationsTimerFired(Timer<PerformanceBase>*)
+void PerformanceBase::deliverObservationsTimerFired(TimerBase*)
 {
     ASSERT(isMainThread());
     PerformanceObservers observers;
     m_activeObservers.swap(observers);
     for (const auto& observer : observers) {
         if (observer->shouldBeSuspended())
             m_suspendedObservers.add(observer);
         else
             observer->deliver();
     }
@@ skipping 26 matching lines @@
     visitor->trace(m_frameTimingBuffer);
     visitor->trace(m_resourceTimingBuffer);
     visitor->trace(m_userTiming);
     visitor->trace(m_observers);
     visitor->trace(m_activeObservers);
     visitor->trace(m_suspendedObservers);
     EventTargetWithInlineData::trace(visitor);
 }
 
 } // namespace blink