New paint invalidation using paint property tree walk

third_party/WebKit/Source/core/layout/LayoutBox.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, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated. 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 3804 matching lines @@
         if (oldLayoutOverflowRect != newLayoutOverflowRect)
             return PaintInvalidationLayoutOverflowBoxChange;
     }
 
     LayoutSize oldBorderBoxSize = computePreviousBorderBoxSize(oldBounds.size());
     LayoutSize newBorderBoxSize = size();
 
     if (oldBorderBoxSize == newBorderBoxSize)
         return invalidationReason;
 
-    // LayoutBox::incrementallyInvalidatePaint() depends on positionFromPaintInvalidationBacking
-    // which is not available when slimmingPaintOffsetCachingEnabled.
-    if (RuntimeEnabledFeatures::slimmingPaintInvalidationEnabled() && (style()->hasBoxDecorations() || style()->hasBackground()))
-        return PaintInvalidationBorderBoxChange;
-
-    // TODO(wangxianzhu): Remove incremental invalidation when we remove rect-based paint invalidation.
     // See another hasNonCompositedScrollbars() callsite above.
     if (hasNonCompositedScrollbars())
         return PaintInvalidationBorderBoxChange;
 
     if (style()->hasVisualOverflowingEffect() || style()->hasAppearance() || style()->hasFilter() || style()->resize() != RESIZE_NONE)
         return PaintInvalidationBorderBoxChange;
 
     if (style()->hasBorderRadius()) {
         // If a border-radius exists and width/height is smaller than radius width/height,
         // we need to fully invalidate to cover the changed radius.
@@ skipping 837 matching lines @@
 }
 
 void LayoutBox::IntrinsicSizingInfo::transpose()
 {
     size = size.transposedSize();
     aspectRatio = aspectRatio.transposedSize();
     std::swap(hasWidth, hasHeight);
 }
 
 } // namespace blink