Update subtree paint properties when preserve-3d changes

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

Index: third_party/WebKit/Source/core/layout/LayoutObject.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutObject.cpp b/third_party/WebKit/Source/core/layout/LayoutObject.cpp
index e561c4bc3cad90e9b8d1fdad4ef17345dc2030fe..9c470b36f1a53bf354e9b2972c291b3dbb1d6e44 100644
--- a/third_party/WebKit/Source/core/layout/LayoutObject.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutObject.cpp
@@ -1932,6 +1932,12 @@ void LayoutObject::styleDidChange(StyleDifference diff,
 
   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) {