Update subtree paint properties when preserve-3d changes

third_party/WebKit/Source/core/layout/LayoutObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc.
  *               All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved.
  *               (http://www.torchmobile.com/)
@@ skipping 1914 matching lines @@
 
   if (diff.needsFullPaintInvalidation() && oldStyle) {
     if (resolveColor(*oldStyle, CSSPropertyBackgroundColor) !=
             resolveColor(CSSPropertyBackgroundColor) ||
         oldStyle->backgroundLayers() != styleRef().backgroundLayers())
       setBackgroundChangedSinceLastPaintInvalidation();
   }
 
   if (oldStyle && oldStyle->styleType() == PseudoIdNone)
     applyPseudoStyleChanges(*oldStyle);
+
+  if (RuntimeEnabledFeatures::slimmingPaintInvalidationEnabled() && oldStyle &&
+      oldStyle->usedTransformStyle3D() != styleRef().usedTransformStyle3D()) {
+    // Change of transform-style may affect descendant transform property nodes.
+    setSubtreeNeedsPaintPropertyUpdate();
+  }
 }
 
 void LayoutObject::applyPseudoStyleChanges(const ComputedStyle& oldStyle) {
   if (oldStyle.hasPseudoStyle(PseudoIdFirstLine) ||
       styleRef().hasPseudoStyle(PseudoIdFirstLine))
     applyFirstLineChanges(oldStyle);
 
   if (oldStyle.hasPseudoStyle(PseudoIdSelection) ||
       styleRef().hasPseudoStyle(PseudoIdSelection))
     invalidatePaintForSelection();
@@ skipping 1653 matching lines @@
     const blink::LayoutObject* root = object1;
     while (root->parent())
       root = root->parent();
     root->showLayoutTreeAndMark(object1, "*", object2, "-", 0);
   } else {
     WTFLogAlways("%s", "Cannot showLayoutTree. Root is (nil)");
   }
 }
 
 #endif