Relayout an object that becomes a spanner.

third_party/WebKit/Source/core/layout/LayoutMultiColumnSpannerPlaceholder.h

 // 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.
 
 #ifndef LayoutMultiColumnSpannerPlaceholder_h
 #define LayoutMultiColumnSpannerPlaceholder_h
 
 #include "core/layout/LayoutMultiColumnFlowThread.h"
 
 namespace blink {
@@ skipping 19 matching lines @@
         // spanner is laid out via its spanner set (us), so we need to make sure that we enter it.
         setChildNeedsLayout(MarkOnlyThis);
     }
 
     void layoutObjectInFlowThreadStyleDidChange(const ComputedStyle* oldStyle);
     void updateMarginProperties();
 
     const char* name() const override { return "LayoutMultiColumnSpannerPlaceholder"; }
 
 protected:
+    void insertedIntoTree() override;
     void willBeRemovedFromTree() override;
     bool needsPreferredWidthsRecalculation() const override;
     LayoutUnit minPreferredLogicalWidth() const override;
     LayoutUnit maxPreferredLogicalWidth() const override;
     void layout() override;
     void computeLogicalHeight(LayoutUnit logicalHeight, LayoutUnit logicalTop, LogicalExtentComputedValues&) const override;
     void invalidatePaintOfSubtreesIfNeeded(const PaintInvalidationState&) override;
     void paint(const PaintInfo&, const LayoutPoint& paintOffset) const override;
     bool nodeAtPoint(HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction) override;
 
 private:
     LayoutMultiColumnSpannerPlaceholder(LayoutBox*);
 
     LayoutBox* m_layoutObjectInFlowThread; // The actual column-span:all layoutObject inside the flow thread.
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutMultiColumnSpannerPlaceholder, isLayoutMultiColumnSpannerPlaceholder());
 
 } // namespace blink
 
 #endif