DO NOT SUBMIT really old prototype of sprite recognition for image replacement

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,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #include "core/css/CSSImageValue.h"
 
 #include "core/css/CSSMarkup.h"
 #include "core/dom/Document.h"
 #include "core/fetch/FetchInitiatorTypeNames.h"
 #include "core/fetch/FetchRequest.h"
 #include "core/fetch/ImageResource.h"
 #include "core/fetch/ResourceFetcher.h"
+#include "core/frame/Settings.h"
 #include "core/loader/MixedContentChecker.h"
 #include "core/style/StyleFetchedImage.h"
 #include "core/style/StyleInvalidImage.h"
 #include "platform/CrossOriginAttributeValue.h"
 #include "platform/weborigin/KURL.h"
 #include "platform/weborigin/SecurityPolicy.h"
 
 namespace blink {
 
 CSSImageValue::CSSImageValue(const AtomicString& rawValue, const KURL& url, StyleImage* image)
     : CSSValue(ImageClass)
     , m_relativeURL(rawValue)
     , m_absoluteURL(url.getString())
     , m_cachedImage(image)
 {
 }
 
 CSSImageValue::CSSImageValue(const AtomicString& absoluteURL)
     : CSSValue(ImageClass)
     , m_relativeURL(absoluteURL)
     , m_absoluteURL(absoluteURL)
 {
 }
 
 CSSImageValue::~CSSImageValue()
 {
 }
 
-StyleImage* CSSImageValue::cacheImage(const Document& document, CrossOriginAttributeValue crossOrigin)
+StyleImage* CSSImageValue::cacheImage(const Document& document, CrossOriginAttributeValue crossOrigin, ImageResource::PlaceholderRequestType placeholderRequestType)
 {
     if (!m_cachedImage) {
         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(), crossOrigin);
 
-        if (ImageResource* cachedImage = ImageResource::fetch(request, document.fetcher()))
+        if (ImageResource* cachedImage = ImageResource::fetch(request, document.fetcher(), placeholderRequestType))
             m_cachedImage = StyleFetchedImage::create(cachedImage, document, request.url());
         else
             m_cachedImage = StyleInvalidImage::create(url());
     }
 
     return m_cachedImage.get();
 }
 
 void CSSImageValue::restoreCachedResourceIfNeeded(const Document& document) const
 {
@@ skipping 47 matching lines @@
 {
     KURL url = document.completeURL(m_relativeURL);
     AtomicString urlString(url.getString());
     if (urlString == m_absoluteURL)
         return;
     m_absoluteURL = urlString;
     m_cachedImage.clear();
 }
 
 } // namespace blink