CSS Animations: Adjust auto z-index when animating perspective

Source/core/css/resolver/StyleResolver.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 1066 matching lines @@
     const WillBeHeapHashMap<CSSPropertyID, RefPtrWillBeMember<Interpolation> >& activeInterpolationsForTransitions = state.animationUpdate()->activeInterpolationsForTransitions();
     applyAnimatedProperties<HighPriorityProperties>(state, activeInterpolationsForAnimations);
     applyAnimatedProperties<HighPriorityProperties>(state, activeInterpolationsForTransitions);
     applyAnimatedProperties<LowPriorityProperties>(state, activeInterpolationsForAnimations);
     applyAnimatedProperties<LowPriorityProperties>(state, activeInterpolationsForTransitions);
 
     // If the animations/transitions change opacity or transform, we need to update
     // 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.
     loadPendingResources(state);
 }
 
 template <StyleResolver::StyleApplicationPass pass>
 void StyleResolver::applyAnimatedProperties(StyleResolverState& state, const WillBeHeapHashMap<CSSPropertyID, RefPtrWillBeMember<Interpolation> >& activeInterpolations)
 {
     ASSERT(pass != AnimationProperties);
@@ skipping 322 matching lines @@
     visitor->trace(m_keyframesRuleMap);
     visitor->trace(m_viewportDependentMediaQueryResults);
     visitor->trace(m_viewportStyleResolver);
     visitor->trace(m_siblingRuleSet);
     visitor->trace(m_uncommonAttributeRuleSet);
     visitor->trace(m_watchedSelectorsRules);
     visitor->trace(m_treeBoundaryCrossingRules);
 }
 
 } // namespace WebCore