Compare relative url if absolute urls are empty for CSSImageValue

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 84 matching lines @@
 
 bool CSSImageValue::hasFailedOrCanceledSubresources() const {
   if (!m_cachedImage)
     return false;
   if (ImageResourceContent* cachedResource = m_cachedImage->cachedImage())
     return cachedResource->loadFailedOrCanceled();
   return true;
 }
 
 bool CSSImageValue::equals(const CSSImageValue& other) const {
+  if (m_absoluteURL.isEmpty() && other.m_absoluteURL.isEmpty())
+    return m_relativeURL == other.m_relativeURL;
   return m_absoluteURL == other.m_absoluteURL;
 }
 
 String CSSImageValue::customCSSText() const {
   return serializeURI(m_relativeURL);
 }
 
 bool CSSImageValue::knownToBeOpaque(const LayoutObject& layoutObject) const {
   return m_cachedImage ? m_cachedImage->knownToBeOpaque(layoutObject) : false;
 }
 
 DEFINE_TRACE_AFTER_DISPATCH(CSSImageValue) {
   visitor->trace(m_cachedImage);
   CSSValue::traceAfterDispatch(visitor);
 }
 
 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