Remove PostAttachCallbacks and replace with something more specialized

Source/core/dom/Document.h

Index: Source/core/dom/Document.h
diff --git a/Source/core/dom/Document.h b/Source/core/dom/Document.h
index fd6775c0781c13bbb5b6451610b2ad4e0ae568d7..2b9bd5f6f648136d2724469e17352e5caf6e15d1 100644
--- a/Source/core/dom/Document.h
+++ b/Source/core/dom/Document.h
@@ -439,6 +439,12 @@ public:
     void scheduleUseShadowTreeUpdate(SVGUseElement&);
     void unscheduleUseShadowTreeUpdate(SVGUseElement&);
 
+    // FIXME: This should be eliminated and elements that use it should be made to
+    // always have a layer so they don't need to go about creating one from reasons
+    // external to style.
+    void scheduleLayerUpdate(Element&);
+    void unscheduleLayerUpdate(Element&);

[ojan, 2014/03/24 19:39:15]

The overloading of layer to mean RenderLayer and GraphicsLayer is super
confused. I'm not sure which one this is. I guess you're not creating that
problem here since scheduleLayerUpdate already exists on Element.

+
     void evaluateMediaQueryList();
 
     FormController& formController();
@@ -1076,6 +1082,7 @@ private:
 
     void inheritHtmlAndBodyElementStyles(StyleRecalcChange);
 
+    bool dirtyElementsForLayerUpdate();
     void updateDistributionIfNeeded();
     void updateUseShadowTreesIfNeeded();
 
@@ -1348,6 +1355,7 @@ private:
     HashSet<RefPtr<Element> > m_associatedFormControls;
 
     HashSet<SVGUseElement*> m_useElementsNeedingUpdate;
+    HashSet<Element*> m_layerUpdateElements;
 
     bool m_hasViewportUnits;