CSS Animations: Adjust auto z-index when animating perspective

Source/core/css/resolver/StyleResolver.cpp

Index: Source/core/css/resolver/StyleResolver.cpp
diff --git a/Source/core/css/resolver/StyleResolver.cpp b/Source/core/css/resolver/StyleResolver.cpp
index 0d1fee7613ff961804fd83deda36a2003401c239..4094b231fa454ecaba34ca859fe93a9155d374d5 100644
--- a/Source/core/css/resolver/StyleResolver.cpp
+++ b/Source/core/css/resolver/StyleResolver.cpp
@@ -1084,7 +1084,7 @@ void StyleResolver::applyAnimatedProperties(StyleResolverState& state, Element*
     // the style to impose the stacking rules. Note that this is also
     // done in StyleResolver::adjustRenderStyle().
     RenderStyle* style = state.style();
-    if (style->hasAutoZIndex() && (style->opacity() < 1.0f || style->hasTransform()))
+    if (style->hasAutoZIndex() && (style->opacity() < 1.0f || style->hasTransformRelatedProperty()))
         style->setZIndex(0);
 
     // Start loading resources used by animations.