Resolve background image's url if absolute url is empty

third_party/WebKit/Source/core/css/CSSImageValue.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 35 matching lines @@
 CSSImageValue::CSSImageValue(const AtomicString& absoluteURL)
     : CSSValue(ImageClass),
       m_relativeURL(absoluteURL),
       m_absoluteURL(absoluteURL) {}
 
 CSSImageValue::~CSSImageValue() {}
 
 StyleImage* CSSImageValue::cacheImage(const Document& document,
                                       CrossOriginAttributeValue crossOrigin) {
   if (!m_cachedImage) {
+    if (m_absoluteURL.isEmpty())
+      reResolveURL(document);
     FetchRequest request(ResourceRequest(m_absoluteURL),
                          m_initiatorName.isEmpty()
                              ? FetchInitiatorTypeNames::css
                              : m_initiatorName);
     request.mutableResourceRequest().setHTTPReferrer(
         SecurityPolicy::generateReferrer(m_referrer.referrerPolicy,
                                          request.url(), m_referrer.referrer));
 
     if (crossOrigin != CrossOriginAttributeNotSet)
       request.setCrossOriginAccessControl(document.getSecurityOrigin(),
@@ skipping 57 matching lines @@
 void CSSImageValue::reResolveURL(const Document& document) const {
   KURL url = document.completeURL(m_relativeURL);
   AtomicString urlString(url.getString());
   if (urlString == m_absoluteURL)
     return;
   m_absoluteURL = urlString;
   m_cachedImage.clear();
 }
 
 }  // namespace blink