Add StyleChangeState to get rid of a bunch of static state in the render tree.

Source/WebCore/rendering/RenderLayerModelObject.h

Index: Source/WebCore/rendering/RenderLayerModelObject.h
diff --git a/Source/WebCore/rendering/RenderLayerModelObject.h b/Source/WebCore/rendering/RenderLayerModelObject.h
index 1cb0ab3d12dd91659cc557b7badf36b6cd6fd5c5..365b90efa8d248fdc86c7461d1b78a7911a3e3d4 100644
--- a/Source/WebCore/rendering/RenderLayerModelObject.h
+++ b/Source/WebCore/rendering/RenderLayerModelObject.h
@@ -40,9 +40,9 @@ public:
     bool hasSelfPaintingLayer() const;
     RenderLayer* layer() const { return m_layer; }
 
-    virtual void styleWillChange(StyleDifference, const RenderStyle* newStyle) OVERRIDE;
-    virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) OVERRIDE;
-    virtual void updateFromStyle() { }
+    virtual void styleWillChange(StyleDifference, const RenderStyle* newStyle, StyleChangeState&) OVERRIDE;
+    virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle, const StyleChangeState&) OVERRIDE;
+    virtual void updateFromStyle(const StyleChangeState&) { }
 
     virtual bool requiresLayer() const = 0;
 
@@ -64,12 +64,6 @@ private:
     virtual bool isLayerModelObject() const OVERRIDE { return true; }
 
     RenderLayer* m_layer;
-
-    // Used to store state between styleWillChange and styleDidChange

[eseidel, 2013/04/05 01:50:36]

I'm gonna cry.  But I can't tell if they're tears of joy at what you've done, or
sadness that this ever existed.

-    static bool s_wasFloating;
-    static bool s_hadLayer;
-    static bool s_hadTransform;
-    static bool s_layerWasSelfPainting;
 };
 
 inline RenderLayerModelObject* toRenderLayerModelObject(RenderObject* object)