Do not show image placeholders for CSS sprites

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

 /*
  * 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
@@ skipping 79 matching lines @@
 
 bool CSSImageSetValue::isCachePending(float deviceScaleFactor) const {
   return !m_cachedImage || deviceScaleFactor != m_cachedScaleFactor;
 }
 
 StyleImage* CSSImageSetValue::cachedImage(float deviceScaleFactor) const {
   DCHECK(!isCachePending(deviceScaleFactor));
   return m_cachedImage.get();
 }
 
-StyleImage* CSSImageSetValue::cacheImage(
-    const Document& document,
-    float deviceScaleFactor,
-    CrossOriginAttributeValue crossOrigin) {
+StyleImage* CSSImageSetValue::cacheImage(const Document& document,
+                                         float deviceScaleFactor,
+                                         CrossOriginAttributeValue crossOrigin,
+                                         bool allowImagePlaceholder) {
   if (!m_imagesInSet.size())
     fillImageSet();
 
   if (isCachePending(deviceScaleFactor)) {
     // FIXME: In the future, we want to take much more than deviceScaleFactor
     // into acount here. All forms of scale should be included:
     // Page::pageScaleFactor(), LocalFrame::pageZoomFactor(), and any CSS
     // transforms. https://bugs.webkit.org/show_bug.cgi?id=81698
     ImageWithScale image = bestImageForScaleFactor(deviceScaleFactor);
     ResourceRequest resourceRequest(document.completeURL(image.imageURL));
     resourceRequest.setHTTPReferrer(image.referrer);
     FetchRequest request(resourceRequest, FetchInitiatorTypeNames::css);
 
     if (crossOrigin != CrossOriginAttributeNotSet)
       request.setCrossOriginAccessControl(document.getSecurityOrigin(),
                                           crossOrigin);
-    if (document.settings() && document.settings()->getFetchImagePlaceholders())
+    if (document.settings() &&
+        document.settings()->getFetchImagePlaceholders() &&
+        allowImagePlaceholder)
       request.setAllowImagePlaceholder();
 
     if (ImageResourceContent* cachedImage =
             ImageResourceContent::fetch(request, document.fetcher()))
       m_cachedImage = StyleFetchedImageSet::create(
           cachedImage, image.scaleFactor, this, request.url());
     else
       m_cachedImage = StyleInvalidImage::create(image.imageURL);
     m_cachedScaleFactor = deviceScaleFactor;
   }
@@ skipping 47 matching lines @@
 CSSImageSetValue* CSSImageSetValue::valueWithURLsMadeAbsolute() {
   CSSImageSetValue* value = CSSImageSetValue::create();
   for (auto& item : *this)
     item->isImageValue()
         ? value->append(*toCSSImageValue(*item).valueWithURLMadeAbsolute())
         : value->append(*item);
   return value;
 }
 
 }  // namespace blink