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

Source/core/rendering/RenderBlockFlow.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2003-2013 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
@@ skipping 30 matching lines @@
 #include "core/rendering/line/TrailingObjects.h"
 #include "core/rendering/style/RenderStyleConstants.h"
 
 namespace blink {
 
 class MarginInfo;
 class LineBreaker;
 class LineInfo;
 class LineWidth;
 class RenderMultiColumnFlowThread;
+class RenderMultiColumnSpannerPlaceholder;
 class RenderRubyRun;
 template <class Run> class BidiRunList;
 
 class RenderBlockFlow : public RenderBlock {
 public:
     explicit RenderBlockFlow(ContainerNode*);
     virtual ~RenderBlockFlow();
     virtual void trace(Visitor*) override;
 
     static RenderBlockFlow* createAnonymous(Document*);
@@ skipping 134 matching lines @@
     GapRects inlineSelectionGaps(const RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
         LayoutUnit& lastLogicalTop, LayoutUnit& lastLogicalLeft, LayoutUnit& lastLogicalRight, const PaintInfo*) const;
     GapRects blockSelectionGaps(const RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
         LayoutUnit& lastLogicalTop, LayoutUnit& lastLogicalLeft, LayoutUnit& lastLogicalRight, const PaintInfo*) const;
     LayoutRect blockSelectionGap(const RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
         LayoutUnit lastLogicalTop, LayoutUnit lastLogicalLeft, LayoutUnit lastLogicalRight, LayoutUnit logicalBottom, const PaintInfo*) const;
 
     LayoutUnit paginationStrut() const { return m_rareData ? m_rareData->m_paginationStrut : LayoutUnit(); }
     void setPaginationStrut(LayoutUnit);
 
+    void positionSpannerDescendant(RenderMultiColumnSpannerPlaceholder& child);
+
     virtual bool avoidsFloats() const override;
 
     using RenderBoxModelObject::moveChildrenTo;
     virtual void moveChildrenTo(RenderBoxModelObject* toBoxModelObject, RenderObject* startChild, RenderObject* endChild, RenderObject* beforeChild, bool fullRemoveInsert = false) override;
 
     LayoutUnit xPositionForFloatIncludingMargin(const FloatingObject* child) const
     {
         if (isHorizontalWritingMode())
             return child->x() + child->renderer()->marginLeft();
 
@@ skipping 310 matching lines @@
 
 // END METHODS DEFINED IN RenderBlockLineLayout
 
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderBlockFlow, isRenderBlockFlow());
 
 } // namespace blink
 
 #endif // RenderBlockFlow_h