[WIP] Test moving stacking context flag update on ComputedStyle

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

Index: third_party/WebKit/Source/core/dom/Element.cpp
diff --git a/third_party/WebKit/Source/core/dom/Element.cpp b/third_party/WebKit/Source/core/dom/Element.cpp
index 5145d3791c96c6e049e7de8c4b4c31350c7e9a3c..82c830bd65e1a3fd1c2e0e1c2cc85799f2dc91a0 100644
--- a/third_party/WebKit/Source/core/dom/Element.cpp
+++ b/third_party/WebKit/Source/core/dom/Element.cpp
@@ -1869,6 +1869,9 @@ PassRefPtr<ComputedStyle> Element::styleForLayoutObject() {
   if (ElementAnimations* elementAnimations = this->elementAnimations()) {
     elementAnimations->cssAnimations().maybeApplyPendingUpdate(this);
     elementAnimations->updateAnimationFlags(*style);
+    // if (style->hasCurrentTransformAnimation()) {
+    //   style->setIsStackingContext(true);
+    // }
   }
 
   if (style->hasTransform()) {
@@ -1877,9 +1880,6 @@ PassRefPtr<ComputedStyle> Element::styleForLayoutObject() {
           inlineStyle->hasProperty(CSSPropertyTransform));
   }
 
-  style->updateIsStackingContext(this == document().documentElement(),
-                                 isInTopLayer());
-
   return style.release();
 }