[SPInvalidation] Update paint properties when layer or paintsWithTransform status change

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 280 matching lines @@
       setChildNeedsLayout();
     if (hadTransform)
       setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation(
           LayoutInvalidationReason::StyleChange);
     if (!needsLayout()) {
       // FIXME: We should call a specialized version of this function.
       parentLayer->updateLayerPositionsAfterLayout();
     }
   }
 
+  if (RuntimeEnabledFeatures::slimmingPaintInvalidationEnabled()) {
+    // hasLayer status will affect whether to create localBorderBoxProperties.
+    if (hadLayer != hasLayer()) {
+      setNeedsPaintPropertyUpdate();
+    } else if (oldStyle && oldStyle->position() != styleRef().position() &&
+               (oldStyle->position() == FixedPosition ||
+                styleRef().position() == FixedPosition)) {
+      // Fixed-position status affects whether to create paintOffsetTranslation.
+      // TODO(chrishtr): Update the condition here when changing the condition
+      // in PaintPropertyTreeBuilder::updatePaintOffsetTranslation().
+      setNeedsPaintPropertyUpdate();
+    }
+  }
+
   if (layer()) {
     layer()->styleDidChange(diff, oldStyle);
     if (hadLayer && layer()->isSelfPaintingLayer() != layerWasSelfPainting)
       setChildNeedsLayout();
   }
 
   if (oldStyle && wasHorizontalWritingMode != isHorizontalWritingMode()) {
     // Changing the getWritingMode() may change isOrthogonalWritingModeRoot()
     // of children. Make sure all children are marked/unmarked as orthogonal
     // writing-mode roots.
@@ skipping 1005 matching lines @@
   if (rootElementStyle->hasBackground())
     return false;
 
   if (node() != document().firstBodyElement())
     return false;
 
   return true;
 }
 
 }  // namespace blink