New paint invalidation using paint property tree walk

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

Index: third_party/WebKit/Source/core/layout/LayoutBox.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutBox.cpp b/third_party/WebKit/Source/core/layout/LayoutBox.cpp
index 54c371e9d09500ca7c9601258e7c25a018b17bec..ce88afbcb046d558b621cc341d1504a7a3b0f28b 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBox.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutBox.cpp
@@ -3822,12 +3822,6 @@ PaintInvalidationReason LayoutBox::getPaintInvalidationReason(const LayoutBoxMod
     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;