Reduce invalidation on children-needs-layout containers

Source/core/rendering/RenderBox.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 276 matching lines @@
                 // If we are getting an overflow clip, preemptively erase any overflowing content.
                 // FIXME: This should probably consult RenderOverflow.
                 repaint();
             }
         }
     }
     setHasOverflowClip(boxHasOverflowClip);
 
     setHasTransform(styleToUse->hasTransformRelatedProperty());
     setHasReflection(styleToUse->boxReflect());
+
+    bool hasEffectVisualOverflow = style()->hasVisualOverflowingEffect() || style()->hasOutline();
+    setHasNothingToPaint(!style()->hasBorder() && !style()->hasBackground() && !hasEffectVisualOverflow);
 }
 
 void RenderBox::layout()
 {
     ASSERT(needsLayout());
 
     LayoutRectRecorder recorder(*this);
 
     RenderObject* child = firstChild();
     if (!child) {
@@ skipping 3846 matching lines @@
 {
     ASSERT(!needsLayout());
     // If fragmentation height has changed, we need to lay out. No need to enter the renderer if it
     // is childless, though.
     if (view()->layoutState()->pageLogicalHeightChanged() && firstChild())
         layoutScope.setChildNeedsLayout(this);
 }
 
 void RenderBox::addVisualEffectOverflow()
 {
-    if (!style()->boxShadow() && !style()->hasBorderImageOutsets())
+    if (!style()->hasVisualOverflowingEffect())
         return;
 
     bool isFlipped = style()->isFlippedBlocksWritingMode();
     bool isHorizontal = isHorizontalWritingMode();
 
     LayoutRect borderBox = borderBoxRect();
     LayoutUnit overflowMinX = borderBox.x();
     LayoutUnit overflowMaxX = borderBox.maxX();
     LayoutUnit overflowMinY = borderBox.y();
     LayoutUnit overflowMaxY = borderBox.maxY();
@@ skipping 531 matching lines @@
         return 0;
 
     if (!layoutState && !flowThreadContainingBlock())
         return 0;
 
     RenderBlock* containerBlock = containingBlock();
     return containerBlock->offsetFromLogicalTopOfFirstPage() + logicalTop();
 }
 
 } // namespace WebCore