Establish a list marker's offset before floats have been added to its line

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2009 Apple 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
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 44 matching lines @@
   LayoutRect localSelectionRect() const final;
   bool isImage() const override;
   const StyleImage* image() const { return m_image.get(); }
   const LayoutListItem* listItem() const { return m_listItem; }
   LayoutSize imageBulletSize() const;
 
   void listItemStyleDidChange();
 
   const char* name() const override { return "LayoutListMarker"; }
 
+  LayoutUnit lineOffset() const { return m_lineOffset; }
+
  protected:
   void willBeDestroyed() override;
 
  private:
   LayoutListMarker(LayoutListItem*);
 
   void computePreferredLogicalWidths() override;
 
   bool isOfType(LayoutObjectType type) const override {
     return type == LayoutObjectListMarker || LayoutBox::isOfType(type);
@@ skipping 30 matching lines @@
   void styleDidChange(StyleDifference, const ComputedStyle* oldStyle) override;
   bool anonymousHasStylePropagationOverride() override { return true; }
 
   bool paintedOutputOfObjectHasNoEffectRegardlessOfSize() const override {
     return false;
   }
 
   String m_text;
   Persistent<StyleImage> m_image;
   LayoutListItem* m_listItem;
+  LayoutUnit m_lineOffset;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutListMarker, isListMarker());
 
 }  // namespace blink
 
 #endif  // LayoutListMarker_h