NOT FOR LANDING Experiment with allocating SVGImageForContainer on demand

Source/core/css/CSSImageSetValue.cpp

Index: Source/core/css/CSSImageSetValue.cpp
diff --git a/Source/core/css/CSSImageSetValue.cpp b/Source/core/css/CSSImageSetValue.cpp
index e02ce18ecc2d60cda0c8f695f0cfebf80eee4ba6..67776e6b3c03f7be288752debe4c96f49cbe9538 100644
--- a/Source/core/css/CSSImageSetValue.cpp
+++ b/Source/core/css/CSSImageSetValue.cpp
@@ -115,7 +115,7 @@ StyleFetchedImageSet* CSSImageSetValue::cachedImageSet(Document* document, float
             request.setCrossOriginAccessControl(document->securityOrigin(), options.allowCredentials, options.credentialsRequested);
 
         if (ResourcePtr<ImageResource> cachedImage = ImageResource::fetch(request, document->fetcher())) {
-            m_imageSet = StyleFetchedImageSet::create(cachedImage.get(), image.scaleFactor, this);
+            m_imageSet = StyleFetchedImageSet::create(cachedImage.get(), image.scaleFactor, this, request.url());
             m_accessedBestFitImage = true;
         }
     }