Untangle multicol coordinate space conversion from offsetFromContainer().

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

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 988 matching lines @@
     // Passing null for |ancestor| behaves the same as localToAncestorQuad.
     TransformationMatrix localToAncestorTransform(const LayoutBoxModelObject* ancestor, MapCoordinatesFlags = 0, bool* wasFixed = nullptr) const;
     TransformationMatrix localToAbsoluteTransform(MapCoordinatesFlags mode = 0, bool* wasFixed = nullptr) const
     {
         return localToAncestorTransform(nullptr, mode, wasFixed);
     }
 
     // Convert a local point into the coordinate system of backing coordinates. Also returns the backing layer if needed.
     FloatPoint localToInvalidationBackingPoint(const LayoutPoint&, PaintLayer** backingLayer = nullptr);
 
-    // Return the offset from the container() layoutObject (excluding transforms). In multi-column layout,
-    // different offsets apply at different points, so return the offset that applies to the given point.
-    virtual LayoutSize offsetFromContainer(const LayoutObject*, const LayoutPoint&, bool* offsetDependsOnPoint = nullptr) const;
+    // Return the offset from the container() layoutObject (excluding transforms and multicol).
+    virtual LayoutSize offsetFromContainer(const LayoutObject*) const;
     // Return the offset from an object up the container() chain. Asserts that none of the intermediate objects have transforms.
     LayoutSize offsetFromAncestorContainer(const LayoutObject*) const;
 
     virtual void absoluteRects(Vector<IntRect>&, const LayoutPoint&) const { }
 
     FloatRect absoluteBoundingBoxFloatRect() const;
     // This returns an IntRect enclosing this object. If this object has an
     // integral size and the position has fractional values, the resultant
     // IntRect can be larger than the integral size.
     IntRect absoluteBoundingBoxRect() const;
@@ skipping 1145 matching lines @@
 void showTree(const blink::LayoutObject*);
 void showLineTree(const blink::LayoutObject*);
 void showLayoutTree(const blink::LayoutObject* object1);
 // We don't make object2 an optional parameter so that showLayoutTree
 // can be called from gdb easily.
 void showLayoutTree(const blink::LayoutObject* object1, const blink::LayoutObject* object2);
 
 #endif
 
 #endif // LayoutObject_h