Ensure serviceOnNextFrame isn't put off indefinitely.

Source/core/animation/AnimationTimeline.cpp

 /*
  * Copyright (C) 2013 Google 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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 156 matching lines @@
 
     if (timeToNextEffect < s_minimumDelay) {
         m_timing->serviceOnNextFrame();
     } else if (timeToNextEffect != std::numeric_limits<double>::infinity()) {
         m_timing->wakeAfter(timeToNextEffect - s_minimumDelay);
     }
 }
 
 void AnimationTimeline::AnimationTimelineTiming::wakeAfter(double duration)
 {
+    if (m_timer.isActive() && m_timer.nextFireInterval() < duration)
+        return;
     m_timer.startOneShot(duration, FROM_HERE);
 }
 
 void AnimationTimeline::AnimationTimelineTiming::cancelWake()
 {
     m_timer.stop();
 }
 
 void AnimationTimeline::AnimationTimelineTiming::serviceOnNextFrame()
 {
@@ skipping 136 matching lines @@
 {
 #if ENABLE(OILPAN)
     visitor->trace(m_document);
     visitor->trace(m_timing);
     visitor->trace(m_animationsNeedingUpdate);
     visitor->trace(m_animations);
 #endif
 }
 
 } // namespace