Web Animations CSS: Record if style recalc is for animation

Source/core/animation/ActiveAnimations.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 22 matching lines @@
 
 #include "core/animation/AnimationStack.h"
 #include "core/animation/css/CSSAnimations.h"
 #include "wtf/HashCountedSet.h"
 #include "wtf/HashMap.h"
 #include "wtf/RefPtr.h"
 #include "wtf/Vector.h"
 
 namespace WebCore {
 
+class CSSAnimations;
 class RenderObject;
 class Element;
 
 // FIXME: Move these to CompositorAnimations
 bool shouldCompositeForActiveAnimations(const RenderObject&);
 bool hasActiveAnimations(const RenderObject&, CSSPropertyID);
 bool hasActiveAnimationsOnCompositor(const RenderObject&, CSSPropertyID);
 
 class ActiveAnimations {
 public:
+    ActiveAnimations()
+        : m_animationStyleChange(false) { }
+
     // Animations that are currently active for this element, their effects will be applied
     // during a style recalc. CSS Transitions are included in this stack.
     AnimationStack& defaultStack() { return m_defaultStack; }
     // Tracks the state of active CSS Animations and Transitions. The individual animations
     // will also be part of the default stack, but the mapping betwen animation name and
     // player is kept here.
     CSSAnimations& cssAnimations() { return m_cssAnimations; }
     const CSSAnimations& cssAnimations() const { return m_cssAnimations; }
 
     typedef HashCountedSet<Player*> PlayerSet;
     // Players which have animations targeting this element.
     const PlayerSet& players() const { return m_players; }
     PlayerSet& players() { return m_players; }
 
     bool isEmpty() const { return m_defaultStack.isEmpty() && m_cssAnimations.isEmpty(); }
 
     bool hasActiveAnimations(CSSPropertyID) const;
     bool hasActiveAnimationsOnCompositor(CSSPropertyID) const;
     void cancelAnimationOnCompositor();
 
+    void setAnimationStyleChange(bool animationStyleChange) { m_animationStyleChange = animationStyleChange; }
+
 private:
+    bool isAnimationStyleChange() const { return m_animationStyleChange; }
+
     AnimationStack m_defaultStack;
     CSSAnimations m_cssAnimations;
     PlayerSet m_players;
+    bool m_animationStyleChange;
+
+    // CSSAnimations checks if a style change is due to animation.
+    friend class CSSAnimations;
 };
 
 } // namespace WebCore
 
 #endif