Make offsetTop/Left handle a relative positioned inline offsetParent correctly.

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 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 193 matching lines @@
   void updateAlwaysCreateLineBoxes(bool fullLayout);
 
   LayoutRect localCaretRect(InlineBox*,
                             int,
                             LayoutUnit* extraWidthToEndOfLine) final;
 
   bool hitTestCulledInline(HitTestResult&,
                            const HitTestLocation& locationInContainer,
                            const LayoutPoint& accumulatedOffset);
 
+  LayoutPoint firstLineBoxTopLeft() const;
+
   const char* name() const override { return "LayoutInline"; }
 
   LayoutRect debugRect() const override;
 
  protected:
   void willBeDestroyed() override;
 
   void styleDidChange(StyleDifference, const ComputedStyle* oldStyle) override;
 
   void computeSelfHitTestRects(Vector<LayoutRect>& rects,
@@ skipping 119 matching lines @@
   // All of the line boxes created for this inline flow. For example,
   // <i>Hello<br>world.</i> will have two <i> line boxes.
   LineBoxList m_lineBoxes;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutInline, isLayoutInline());
 
 }  // namespace blink
 
 #endif  // LayoutInline_h