Handle auto-positioned out-of-flow objects inside multicol containers correctly.

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

 /*
  * Copyright (C) 2011 Adobe Systems Incorporated. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above
  *    copyright notice, this list of conditions and the following
  *    disclaimer.
@@ skipping 105 matching lines @@
 
     virtual bool isPageLogicalHeightKnown() const { return true; }
     bool pageLogicalSizeChanged() const { return m_pageLogicalSizeChanged; }
 
     void collectLayerFragments(PaintLayerFragments&, const LayoutRect& layerBoundingBox, const LayoutRect& dirtyRectInFlowThread);
 
     // Return the visual bounding box based on the supplied flow-thread bounding box. Both
     // rectangles are completely physical in terms of writing mode.
     LayoutRect fragmentsBoundingBox(const LayoutRect& layerBoundingBox) const;
 
+    // Convert a logical position in the flow thread coordinate space to a logical position in the
+    // containing coordinate space.
+    void flowThreadToContainingCoordinateSpace(LayoutUnit& blockPosition, LayoutUnit& inlinePosition) const;
+
     virtual LayoutPoint flowThreadPointToVisualPoint(const LayoutPoint& flowThreadPoint) const = 0;
     virtual LayoutPoint visualPointToFlowThreadPoint(const LayoutPoint& visualPoint) const = 0;
 
     virtual LayoutMultiColumnSet* columnSetAtBlockOffset(LayoutUnit) const = 0;
 
     virtual const char* name() const = 0;
 
 protected:
     void generateColumnSetIntervalTree();
 
@@ skipping 32 matching lines @@
 // These structures are used by PODIntervalTree for debugging.
 #ifndef NDEBUG
 template <> struct ValueToString<LayoutMultiColumnSet*> {
     static String toString(const LayoutMultiColumnSet* value) { return String::format("%p", value); }
 };
 #endif
 
 } // namespace blink
 
 #endif // LayoutFlowThread_h