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

Source/core/paint/BlockPainter.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/paint/BlockPainter.h"
 
 #include "core/editing/Caret.h"
 #include "core/editing/FrameSelection.h"
 #include "core/frame/LocalFrame.h"
@@ skipping 93 matching lines @@
 
 void BlockPainter::paintChildren(const PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 {
     for (RenderBox* child = m_renderBlock.firstChildBox(); child; child = child->nextSiblingBox())
         paintChild(child, paintInfo, paintOffset);
 }
 
 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);
 }
 
 void BlockPainter::paintChildrenOfFlexibleBox(RenderFlexibleBox& renderFlexibleBox, const PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 {
     for (RenderBox* child = renderFlexibleBox.orderIterator().first(); child; child = renderFlexibleBox.orderIterator().next())
         BlockPainter(renderFlexibleBox).paintChildAsInlineBlock(child, paintInfo, paintOffset);
 }
 
 void BlockPainter::paintChildAsInlineBlock(RenderBox* child, const PaintInfo& paintInfo, const LayoutPoint& paintOffset)
@@ skipping 370 matching lines @@
         RenderBlock* block = flow->containingBlock();
         for ( ; block && block != &m_renderBlock; block = block->containingBlock())
             accumulatedPaintOffset.moveBy(block->location());
         ASSERT(block);
         InlinePainter(*flow).paintOutline(info, accumulatedPaintOffset);
     }
 }
 
 
 } // namespace blink