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

third_party/WebKit/Source/core/loader/ImageLoader.cpp

Index: third_party/WebKit/Source/core/loader/ImageLoader.cpp
diff --git a/third_party/WebKit/Source/core/loader/ImageLoader.cpp b/third_party/WebKit/Source/core/loader/ImageLoader.cpp
index 8a67a4c86411afc5534c94a6808313ccf1e0a00d..961c06c18cf185e2cac5cdd527dfd668df69ebd7 100644
--- a/third_party/WebKit/Source/core/loader/ImageLoader.cpp
+++ b/third_party/WebKit/Source/core/loader/ImageLoader.cpp
@@ -292,7 +292,10 @@ void ImageLoader::doUpdateFromElement(BypassMainWorldBehavior bypassBehavior, Up
         FetchRequest request(resourceRequest, element()->localName(), resourceLoaderOptions);
         configureRequest(request, bypassBehavior, *m_element, document.clientHintsPreferences());
 
-        newImage = ImageResource::fetch(request, document.fetcher());
+        ImageResource::PlaceholderRequestType placeholderRequestType = document.settings() && document.settings()->fetchImagePlaceholders() && updateBehavior != UpdateForcedReload
+            ? ImageResource::PlaceholderRequestType::AllowPlaceholder
+            : ImageResource::PlaceholderRequestType::DisallowPlaceholder;
+        newImage = ImageResource::fetch(request, document.fetcher(), placeholderRequestType);
 
         if (!newImage && !pageIsBeingDismissed(&document)) {
             crossSiteOrCSPViolationOccurred(imageSourceURL);