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

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

 /*
  * 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 764 matching lines @@
 
 }  // unnamed namespace
 
 void LayoutInline::absoluteQuadsForSelf(Vector<FloatQuad>& quads) const {
   AbsoluteQuadsGeneratorContext context(this, quads);
   generateLineBoxRects(context);
   if (quads.isEmpty())
     context(FloatRect());
 }
 
+LayoutPoint LayoutInline::firstLineBoxTopLeft() const {
+  if (InlineBox* firstBox = firstLineBoxIncludingCulling())
+    return firstBox->topLeft();
+  return LayoutPoint();
+}
+
 LayoutUnit LayoutInline::offsetLeft(const Element* parent) const {
-  LayoutPoint topLeft;
-  if (InlineBox* firstBox = firstLineBoxIncludingCulling()) {
-    topLeft = firstBox->topLeft();
-  }
-  return adjustedPositionRelativeTo(topLeft, parent).x();
+  return adjustedPositionRelativeTo(firstLineBoxTopLeft(), parent).x();
 }
 
 LayoutUnit LayoutInline::offsetTop(const Element* parent) const {
-  LayoutPoint topLeft;
-  if (InlineBox* firstBox = firstLineBoxIncludingCulling()) {
-    topLeft = firstBox->topLeft();
-  }
-  return adjustedPositionRelativeTo(topLeft, parent).y();
+  return adjustedPositionRelativeTo(firstLineBoxTopLeft(), parent).y();
 }
 
 static LayoutUnit computeMargin(const LayoutInline* layoutObject,
                                 const Length& margin) {
   if (margin.isFixed())
     return LayoutUnit(margin.value());
   if (margin.isPercentOrCalc())
     return minimumValueForLength(
         margin,
         std::max(LayoutUnit(),
@@ skipping 705 matching lines @@
     paintInvalidator.invalidateDisplayItemClient(*box, invalidationReason);
 }
 
 // TODO(lunalu): Not to just dump 0, 0 as the x and y here
 LayoutRect LayoutInline::debugRect() const {
   IntRect linesBox = enclosingIntRect(linesBoundingBox());
   return LayoutRect(IntRect(0, 0, linesBox.width(), linesBox.height()));
 }
 
 }  // namespace blink