[WIP] Test moving stacking context flag update on ComputedStyle

third_party/WebKit/Source/core/dom/Element.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc.
  * All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
@@ skipping 1851 matching lines @@
   if (hasCustomStyleCallbacks())
     style = customStyleForLayoutObject();
   if (!style)
     style = originalStyleForLayoutObject();
   DCHECK(style);
 
   // styleForElement() might add active animations so we need to get it again.
   if (ElementAnimations* elementAnimations = this->elementAnimations()) {
     elementAnimations->cssAnimations().maybeApplyPendingUpdate(this);
     elementAnimations->updateAnimationFlags(*style);
+    // if (style->hasCurrentTransformAnimation()) {
+    //   style->setIsStackingContext(true);
+    // }
   }
 
   if (style->hasTransform()) {
     if (const StylePropertySet* inlineStyle = this->inlineStyle())
       style->setHasInlineTransform(
           inlineStyle->hasProperty(CSSPropertyTransform));
   }
 
-  style->updateIsStackingContext(this == document().documentElement(),
-                                 isInTopLayer());
-
   return style.release();
 }
 
 PassRefPtr<ComputedStyle> Element::originalStyleForLayoutObject() {
   DCHECK(document().inStyleRecalc());
   return document().ensureStyleResolver().styleForElement(this);
 }
 
 void Element::recalcStyle(StyleRecalcChange change, Text* nextTextSibling) {
   DCHECK(document().inStyleRecalc());
@@ skipping 2335 matching lines @@
 }
 
 DEFINE_TRACE_WRAPPERS(Element) {
   if (hasRareData()) {
     visitor->traceWrappers(elementRareData());
   }
   ContainerNode::traceWrappers(visitor);
 }
 
 }  // namespace blink