Fix getComputedStyle background-position to output calc values

Source/core/css/CSSComputedStyleDeclaration.cpp

 /*
  * Copyright (C) 2004 Zack Rusin <zack@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  * Copyright (C) 2011 Sencha, Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
@@ skipping 546 matching lines @@
 
 inline static PassRefPtr<CSSPrimitiveValue> zoomAdjustedNumberValue(double value, const RenderStyle* style)
 {
     return cssValuePool().createValue(value / style->effectiveZoom(), CSSPrimitiveValue::CSS_NUMBER);
 }
 
 static PassRefPtr<CSSPrimitiveValue> zoomAdjustedPixelValueForLength(const Length& length, const RenderStyle* style)
 {
     if (length.isFixed())
         return zoomAdjustedPixelValue(length.value(), style);
-    return cssValuePool().createValue(length);
+    return cssValuePool().createValue(length, style);
 }
 
 static PassRefPtr<CSSValue> valueForReflection(const StyleReflection* reflection, const RenderStyle* style)
 {
     if (!reflection)
         return cssValuePool().createIdentifierValue(CSSValueNone);
 
     RefPtr<CSSPrimitiveValue> offset;
     if (reflection->offset().isPercent())
         offset = cssValuePool().createValue(reflection->offset().percent(), CSSPrimitiveValue::CSS_PERCENTAGE);
@@ skipping 2660 matching lines @@
     static const CSSPropertyID propertiesAfterSlashSeperator[3] = { CSSPropertyBackgroundSize, CSSPropertyBackgroundOrigin,
                                                                     CSSPropertyBackgroundClip };
 
     RefPtr<CSSValueList> list = CSSValueList::createSlashSeparated();
     list->append(valuesForShorthandProperty(StylePropertyShorthand(CSSPropertyBackground, propertiesBeforeSlashSeperator, WTF_ARRAY_LENGTH(propertiesBeforeSlashSeperator))));
     list->append(valuesForShorthandProperty(StylePropertyShorthand(CSSPropertyBackground, propertiesAfterSlashSeperator, WTF_ARRAY_LENGTH(propertiesAfterSlashSeperator))));
     return list.release();
 }
 
 } // namespace WebCore