Fix wrong PaintInvalidationIncremental on empty object

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 7a739571095415dfd677e44b05786def16d6c3fe..4b0c8365aef5e96fb9ec69f3457bc80a2c1b65e2 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBox.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutBox.cpp
@@ -2042,7 +2042,7 @@ bool LayoutBox::paintedOutputOfObjectHasNoEffect() const
         return false;
 
     // Cannot skip paint invalidation if the box has real things to paint.
-    if (getSelectionState() != SelectionNone || hasBoxDecorationBackground() || styleRef().hasVisualOverflowingEffect())
+    if (getSelectionState() != SelectionNone || hasBoxDecorationBackground() || styleRef().hasBoxDecorations() || styleRef().hasVisualOverflowingEffect())
         return false;
 
     // If the box has clip, we need issue a paint invalidation to cover the changed part of
@@ -4055,7 +4055,7 @@ PaintInvalidationReason LayoutBox::getPaintInvalidationReason(const PaintInvalid
     if (oldBorderBoxSize.height() != newBorderBoxSize.height() && mustInvalidateBackgroundOrBorderPaintOnHeightChange())
         return PaintInvalidationBorderBoxChange;
 
-    return PaintInvalidationIncremental;
+    return styleRef().hasBackground() || styleRef().hasBoxDecorations() ? PaintInvalidationIncremental : invalidationReason;
 }
 
 void LayoutBox::incrementallyInvalidatePaint(const LayoutBoxModelObject& paintInvalidationContainer, const LayoutRect& oldBounds, const LayoutRect& newBounds, const LayoutPoint& positionFromPaintInvalidationBacking)