Web Animations CSS: Unfreeze AnimationClock if sampling timelines does not trigger style recalc

Source/core/animation/AnimationClock.h

 /*
  * 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 27 matching lines @@
 
 class AnimationClock {
 public:
     static PassOwnPtr<AnimationClock> create(WTF::TimeFunction monotonicallyIncreasingTime = WTF::monotonicallyIncreasingTime)
     {
         return adoptPtr(new AnimationClock(monotonicallyIncreasingTime));
     }
 
     void updateTime(double time)
     {
-        ASSERT(m_time <= time);

[Timothy Loh, 2013/10/30 03:55:07]

Could you mention why  we're removing this assertion?

[Steve Block, 2013/11/01 03:04:59]

I removed it because we were hitting it in some unit tests. But it turns out
that we no longer do so in the latest version. Will reinstate.

         m_time = time;
         m_frozen = true;
     }
 
     double currentTime()
     {
         if (!m_frozen)
             updateTime(m_monotonicallyIncreasingTime());
         return m_time;
     }
@@ skipping 10 matching lines @@
     {
     }
     WTF::TimeFunction m_monotonicallyIncreasingTime;
     double m_time;
     bool m_frozen;
 };
 
 } // namespace WebCore
 
 #endif // AnimationClock_h