[New Multicolumn] Layout support for column-span:all.

Source/core/paint/BlockPainter.cpp

Index: Source/core/paint/BlockPainter.cpp
diff --git a/Source/core/paint/BlockPainter.cpp b/Source/core/paint/BlockPainter.cpp
index 8b1b93a4b19a3f2fac0433cacce6685f1b73103b..a6ae89ae79b2f506964d667ef3953318cd6e569d 100644
--- a/Source/core/paint/BlockPainter.cpp
+++ b/Source/core/paint/BlockPainter.cpp
@@ -100,7 +100,7 @@ void BlockPainter::paintChildren(const PaintInfo& paintInfo, const LayoutPoint&
 void BlockPainter::paintChild(RenderBox* child, const PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 {
     LayoutPoint childPoint = m_renderBlock.flipForWritingModeForChild(child, paintOffset);
-    if (!child->hasSelfPaintingLayer() && !child->isFloating())
+    if (!child->hasSelfPaintingLayer() && !child->isFloating() && !child->isColumnSpanAll())
         child->paint(paintInfo, childPoint);
 }