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

Source/core/css/CSSImageGeneratorValue.cpp

 /*
  * Copyright (C) 2008 Apple Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 48 matching lines @@
 
     LayoutObjectSizeCountMap::iterator it = m_clients.find(layoutObject);
     if (it == m_clients.end()) {
         m_clients.add(layoutObject, SizeAndCount(size, 1));
     } else {
         SizeAndCount& sizeCount = it->value;
         ++sizeCount.count;
     }
 }
 
+PassRefPtrWillBeRawPtr<CSSImageGeneratorValue> CSSImageGeneratorValue::valueWithURLsMadeAbsolute()
+{
+    if (isCrossfadeValue())
+        return toCSSCrossfadeValue(this)->valueWithURLsMadeAbsolute();
+    return this;
+}
+
 void CSSImageGeneratorValue::removeClient(LayoutObject* layoutObject)
 {
     ASSERT(layoutObject);
     LayoutObjectSizeCountMap::iterator it = m_clients.find(layoutObject);
     ASSERT_WITH_SECURITY_IMPLICATION(it != m_clients.end());
 
     IntSize removedImageSize;
     SizeAndCount& sizeCount = it->value;
     IntSize size = sizeCount.size;
     if (!size.isEmpty()) {
@@ skipping 140 matching lines @@
         break;
     case RadialGradientClass:
         toCSSRadialGradientValue(this)->loadSubimages(document);
         break;
     default:
         ASSERT_NOT_REACHED();
     }
 }
 
 } // namespace blink