Web Animations: Fix CSS events to handle animations with very short durations

Source/core/animation/TimedItem.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 34 matching lines @@
 }
 
 static inline double nullValue()
 {
     return std::numeric_limits<double>::quiet_NaN();
 }
 
 class TimedItemEventDelegate {
 public:
     virtual ~TimedItemEventDelegate() { };
-    virtual void onEventCondition(bool wasInPlay, bool isInPlay, double previousIteration, double currentIteration) = 0;
+    virtual void onEventCondition(bool wasInPlay, bool isInPlay, bool wasCurrent, bool isCurrent, double previousIteration, double currentIteration) = 0;
 };
 
 class TimedItem : public RefCounted<TimedItem> {
     friend class Player; // Calls attach/detach, updateInheritedTime.
 public:
     virtual ~TimedItem() { }
 
     bool isCurrent() const { return ensureCalculated().isCurrent; }
     bool isInEffect() const { return ensureCalculated().isInEffect; }
     bool isInPlay() const { return ensureCalculated().isInPlay; }
@@ skipping 34 matching lines @@
 
     // FIXME: m_parent and m_startTime are placeholders, they depend on timing groups.
     TimedItem* const m_parent;
     const double m_startTime;
     Player* m_player;
     Timing m_specified;
     OwnPtr<TimedItemEventDelegate> m_eventDelegate;
 
     // FIXME: Should be versioned by monotonic value on player.
     mutable struct CalculatedTiming {
-        CalculatedTiming();
         double activeDuration;
         double currentIteration;
         double timeFraction;
         bool isCurrent;
         bool isInEffect;
         bool isInPlay;
     } m_calculated;
+    mutable bool m_isFirstSample;
 
     // FIXME: Should check the version and reinherit time if inconsistent.
     const CalculatedTiming& ensureCalculated() const { return m_calculated; }
 };
 
 } // namespace WebCore
 
 #endif