Reduce the number of ObjectPaintProperties

third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/paint/PaintPropertyTreeBuilder.h"
 
 #include <memory>
 #include "core/dom/DOMNodeIds.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
@@ skipping 665 matching lines @@
   if (properties && properties->cssClip())
     context.current.clip = properties->cssClip();
 }
 
 void PaintPropertyTreeBuilder::updateLocalBorderBoxContext(
     const LayoutObject& object,
     PaintPropertyTreeBuilderContext& context) {
   if (!object.needsPaintPropertyUpdate() && !context.forceSubtreeUpdate)
     return;
 
-  // Avoid adding an ObjectPaintProperties for non-boxes to save memory, since
-  // we don't need them at the moment.
-  if (!object.isBox() && !object.hasLayer()) {
+  // We need localBorderBoxProperties for layered objects only.
+  if (!object.hasLayer()) {
     if (auto* properties = object.getMutableForPainting().paintProperties())
       properties->clearLocalBorderBoxProperties();
   } else {
     auto& properties = object.getMutableForPainting().ensurePaintProperties();
     properties.updateLocalBorderBoxProperties(
         context.current.transform, context.current.clip, context.currentEffect);
   }
 }
 
 // TODO(trchen): Remove this once we bake the paint offset into frameRect.
@@ skipping 426 matching lines @@
   updateOverflowClip(object, context);
   updatePerspective(object, context);
   updateSvgLocalToBorderBoxTransform(object, context);
   updateScrollAndScrollTranslation(object, context);
   updateOutOfFlowContext(object, context);
 
   context.forceSubtreeUpdate |= object.subtreeNeedsPaintPropertyUpdate();
 }
 
 }  // namespace blink