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..1c29d4a33fecd069803d684cd9fe1f78c11deac9 100644
--- a/Source/core/animation/ActiveAnimations.h
+++ b/Source/core/animation/ActiveAnimations.h
@@ -33,6 +33,7 @@
 
 #include "core/animation/AnimationStack.h"
 #include "core/animation/css/CSSAnimations.h"
+#include "core/rendering/style/RenderStyle.h"
 #include "wtf/HashCountedSet.h"
 #include "wtf/HashMap.h"
 #include "wtf/RefPtr.h"
@@ -75,6 +76,17 @@ 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> renderStyle)

[esprehn, 2014/10/13 18:19:33]

Can we make this out of line instead? Then we don't need to include
RenderStyle.h in this and all over more files.

[rune, 2014/10/13 21:31:48]

Done.

+    {
+#if ENABLE(ASSERT)
+        if (m_baseRenderStyle && renderStyle)
+            ASSERT(*m_baseRenderStyle == *renderStyle);
+#endif
+        m_baseRenderStyle = renderStyle;
+    }
 
 #if !ENABLE(OILPAN)
     void addAnimation(Animation* animation) { m_animations.append(animation); }
@@ -84,12 +96,11 @@ 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