[New Multicolumn] boundingBoxForCompositingOverlapTest() needs to use fragmentsBoundingBox().

Source/core/rendering/RenderLayer.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
  *   Randall Jesup <rjesup@wgate.com>
@@ skipping 2265 matching lines @@
     if (!enclosingPaginationLayer())
         return physicalBoundingBox(ancestorLayer);
 
     LayoutRect result = flippedLogicalBoundingBox(logicalBoundingBox(), renderer());
     convertFromFlowThreadToVisualBoundingBoxInAncestor(this, ancestorLayer, result);
     return result;
 }
 
 LayoutRect RenderLayer::boundingBoxForCompositingOverlapTest() const
 {
-    return overlapBoundsIncludeChildren() ? boundingBoxForCompositing() : flippedLogicalBoundingBox(logicalBoundingBox(), renderer());
+    return overlapBoundsIncludeChildren() ? boundingBoxForCompositing() : fragmentsBoundingBox(this);
 }
 
 static void expandRectForReflectionAndStackingChildren(const RenderLayer* ancestorLayer, RenderLayer::CalculateBoundsOptions options, LayoutRect& result)
 {
     if (ancestorLayer->reflectionInfo() && !ancestorLayer->reflectionInfo()->reflectionLayer()->hasCompositedLayerMapping())
         result.unite(ancestorLayer->reflectionInfo()->reflectionLayer()->boundingBoxForCompositing(ancestorLayer));
 
     ASSERT(ancestorLayer->stackingNode()->isStackingContext() || !ancestorLayer->stackingNode()->hasPositiveZOrderList());
 
 #if ENABLE(ASSERT)
@@ skipping 573 matching lines @@
     }
 }
 
 void showLayerTree(const blink::RenderObject* renderer)
 {
     if (!renderer)
         return;
     showLayerTree(renderer->enclosingLayer());
 }
 #endif