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

third_party/WebKit/Source/core/css/CSSImageSetValue.h

 /*
  * Copyright (C) 2012 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
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  * THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef CSSImageSetValue_h
 #define CSSImageSetValue_h
 
 #include "core/css/CSSValueList.h"
+#include "core/fetch/ImageResource.h"
 #include "platform/CrossOriginAttributeValue.h"
 #include "platform/weborigin/Referrer.h"
 #include "wtf/Allocator.h"
 
 namespace blink {
 
 class Document;
 class StyleImage;
 
 class CSSImageSetValue : public CSSValueList {
 public:
 
     static CSSImageSetValue* create()
     {
         return new CSSImageSetValue();
     }
     ~CSSImageSetValue();
 
     bool isCachePending(float deviceScaleFactor) const;
     StyleImage* cachedImage(float deviceScaleFactor) const;
-    StyleImage* cacheImage(const Document&, float deviceScaleFactor, CrossOriginAttributeValue = CrossOriginAttributeNotSet);
+    StyleImage* cacheImage(const Document&, float deviceScaleFactor, CrossOriginAttributeValue = CrossOriginAttributeNotSet, ImageResource::PlaceholderRequestType = ImageResource::PlaceholderRequestType::DisallowPlaceholder);
 
     String customCSSText() const;
 
     struct ImageWithScale {
         DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
         String imageURL;
         Referrer referrer;
         float scaleFactor;
     };
 
@@ skipping 16 matching lines @@
     Member<StyleImage> m_cachedImage;
 
     Vector<ImageWithScale> m_imagesInSet;
 };
 
 DEFINE_CSS_VALUE_TYPE_CASTS(CSSImageSetValue, isImageSetValue());
 
 } // namespace blink
 
 #endif // CSSImageSetValue_h