Skip rule matching during animations.

Source/core/animation/ActiveAnimations.h

Index: Source/core/animation/ActiveAnimations.h
diff --git a/Source/core/animation/ActiveAnimations.h b/Source/core/animation/ActiveAnimations.h
index 64d665b61ae56b85ce6b4cd9e47914812bef4e0e..b0ebcc50f8e99cede07d2f0610408d38bfda80ae 100644
--- a/Source/core/animation/ActiveAnimations.h
+++ b/Source/core/animation/ActiveAnimations.h
@@ -49,11 +49,7 @@ typedef WillBeHeapHashCountedSet<RawPtrWillBeWeakMember<AnimationPlayer> > Anima
 class ActiveAnimations : public NoBaseWillBeGarbageCollectedFinalized<ActiveAnimations> {
     WTF_MAKE_NONCOPYABLE(ActiveAnimations);
 public:
-    ActiveAnimations()
-        : m_animationStyleChange(false)
-    {
-    }
-
+    ActiveAnimations();
     ~ActiveAnimations();
 
     // Animations that are currently active for this element, their effects will be applied
@@ -75,6 +71,10 @@ public:
 
     void updateAnimationFlags(RenderStyle&);
     void setAnimationStyleChange(bool animationStyleChange) { m_animationStyleChange = animationStyleChange; }
+    bool isAnimationStyleChange() const { return m_animationStyleChange; }
+
+    const RenderStyle* baseRenderStyle() const { return m_baseRenderStyle.get(); }
+    void setBaseRenderStyle(PassRefPtr<RenderStyle>);
 
 #if !ENABLE(OILPAN)
     void addAnimation(Animation* animation) { m_animations.append(animation); }
@@ -84,12 +84,11 @@ public:
     void trace(Visitor*);
 
 private:
-    bool isAnimationStyleChange() const { return m_animationStyleChange; }
-
     AnimationStack m_defaultStack;
     CSSAnimations m_cssAnimations;
     AnimationPlayerCountedSet m_players;
     bool m_animationStyleChange;
+    RefPtr<RenderStyle> m_baseRenderStyle;
 
 #if !ENABLE(OILPAN)
     // FIXME: Oilpan: This is to avoid a reference cycle that keeps Elements alive