BackgroundImage incorrectly returns empty url() when created on-the-fly

Source/core/style/StyleGeneratedImage.cpp

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2006, 2007, 2008 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 24 matching lines @@
     , m_fixedSize(m_imageGeneratorValue->isFixedSize())
 {
     m_isGeneratedImage = true;
 }
 
 PassRefPtrWillBeRawPtr<CSSValue> StyleGeneratedImage::cssValue() const
 {
     return m_imageGeneratorValue.get();
 }
 
+PassRefPtrWillBeRawPtr<CSSValue> StyleGeneratedImage::computedCSSValue() const
+{
+    return m_imageGeneratorValue->valueWithURLMadeAbsolute();
+}
+
 LayoutSize StyleGeneratedImage::imageSize(const LayoutObject* layoutObject, float multiplier) const
 {
     if (m_fixedSize) {
         LayoutSize fixedSize(m_imageGeneratorValue->fixedSize(layoutObject));
         if (multiplier == 1.0f)
             return fixedSize;
 
         LayoutUnit width = fixedSize.width() * multiplier;
         LayoutUnit height = fixedSize.height() * multiplier;
 
@@ skipping 39 matching lines @@
     return m_imageGeneratorValue->knownToBeOpaque(layoutObject);
 }
 
 DEFINE_TRACE(StyleGeneratedImage)
 {
     visitor->trace(m_imageGeneratorValue);
     StyleImage::trace(visitor);
 }
 
 }