Formatting contexts should always expand to enclose floats

Source/core/layout/LayoutBlockFlow.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 224 matching lines @@
             child->y() + child->layoutObject()->marginTop());
     }
 
     LayoutPoint flipFloatForWritingModeForChild(const FloatingObject*, const LayoutPoint&) const;
 
     virtual const char* name() const override { return "LayoutBlockFlow"; }
 
 protected:
     void rebuildFloatsFromIntruding();
     void layoutInlineChildren(bool relayoutChildren, LayoutUnit& paintInvalidationLogicalTop, LayoutUnit& paintInvalidationLogicalBottom, LayoutUnit afterEdge);
+    void addLowestFloatFromChildren(LayoutBlockFlow*);
 
     void createFloatingObjects();
 
     virtual void styleWillChange(StyleDifference, const ComputedStyle& newStyle) override;
     virtual void styleDidChange(StyleDifference, const ComputedStyle* oldStyle) override;
 
     void updateBlockChildDirtyBitsBeforeLayout(bool relayoutChildren, LayoutBox&);
 
     void addOverflowFromFloats();
 
@@ skipping 283 matching lines @@
 
 // END METHODS DEFINED IN LayoutBlockFlowLine
 
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutBlockFlow, isLayoutBlockFlow());
 
 } // namespace blink
 
 #endif // LayoutBlockFlow_h