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

Source/core/style/StyleFetchedImage.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 31 matching lines @@
 StyleFetchedImage::~StyleFetchedImage()
 {
     m_image->removeClient(this);
 }
 
 PassRefPtrWillBeRawPtr<CSSValue> StyleFetchedImage::cssValue() const
 {
     return CSSImageValue::create(m_image->url(), const_cast<StyleFetchedImage*>(this));
 }
 
+PassRefPtrWillBeRawPtr<CSSValue> StyleFetchedImage::computedCSSValue() const
+{
+    return cssValue();
+}
+
 bool StyleFetchedImage::canRender(const LayoutObject& layoutObject, float multiplier) const
 {
     return m_image->canRender(layoutObject, multiplier);
 }
 
 bool StyleFetchedImage::isLoaded() const
 {
     return m_image->isLoaded();
 }
 
@@ skipping 60 matching lines @@
     return m_image->currentFrameKnownToBeOpaque(layoutObject);
 }
 
 DEFINE_TRACE(StyleFetchedImage)
 {
     visitor->trace(m_document);
     StyleImage::trace(visitor);
 }
 
 }