| Index: Source/core/rendering/RenderBlockFlow.h | 
| diff --git a/Source/core/rendering/RenderBlockFlow.h b/Source/core/rendering/RenderBlockFlow.h | 
| index e44748bdad11a281e459d56a664787342bebfeb9..b79e0953f28f5e380836e65838877145f91e18df 100644 | 
| --- a/Source/core/rendering/RenderBlockFlow.h | 
| +++ b/Source/core/rendering/RenderBlockFlow.h | 
| @@ -48,6 +48,7 @@ class LineBreaker; | 
| class LineInfo; | 
| class LineWidth; | 
| class RenderMultiColumnFlowThread; | 
| +class RenderMultiColumnSpannerPlaceholder; | 
| class RenderRubyRun; | 
| template <class Run> class BidiRunList; | 
|  | 
| @@ -202,6 +203,8 @@ public: | 
| 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; | 
|  |