NOT FOR LANDING Experiment with allocating SVGImageForContainer on demand

Source/core/style/StyleFetchedImageSet.h

Index: Source/core/style/StyleFetchedImageSet.h
diff --git a/Source/core/style/StyleFetchedImageSet.h b/Source/core/style/StyleFetchedImageSet.h
index 2ad89c3fefb7eccd410a0870c642e609f3e5ae46..88a1ad0c2460f67357ea0df8bb236033334b7f7b 100644
--- a/Source/core/style/StyleFetchedImageSet.h
+++ b/Source/core/style/StyleFetchedImageSet.h
@@ -41,9 +41,9 @@ class CSSImageSetValue;
 class StyleFetchedImageSet final : public StyleImage, private ImageResourceClient {
     WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(StyleFetchedImageSet);
 public:
-    static PassRefPtrWillBeRawPtr<StyleFetchedImageSet> create(ImageResource* image, float imageScaleFactor, CSSImageSetValue* value)
+    static PassRefPtrWillBeRawPtr<StyleFetchedImageSet> create(ImageResource* image, float imageScaleFactor, CSSImageSetValue* value, const KURL& urlWithFragment)
     {
-        return adoptRefWillBeNoop(new StyleFetchedImageSet(image, imageScaleFactor, value));
+        return adoptRefWillBeNoop(new StyleFetchedImageSet(image, imageScaleFactor, value, urlWithFragment));
     }
     ~StyleFetchedImageSet() override;
 
@@ -66,23 +66,24 @@ public:
     bool imageHasRelativeHeight() const override;
     void computeIntrinsicDimensions(const LayoutObject*, Length& intrinsicWidth, Length& intrinsicHeight, FloatSize& intrinsicRatio) override;
     bool usesImageContainerSize() const override;
-    void setContainerSizeForLayoutObject(const LayoutObject*, const IntSize&, float) override;
     void addClient(LayoutObject*) override;
     void removeClient(LayoutObject*) override;
     PassRefPtr<Image> image(LayoutObject*, const IntSize&) const override;
     float imageScaleFactor() const override { return m_imageScaleFactor; }
     bool knownToBeOpaque(const LayoutObject*) const override;
     ImageResource* cachedImage() const override { return m_bestFitImage.get(); }
+    KURL url() const override { return m_urlWithFragment; }
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
-    StyleFetchedImageSet(ImageResource*, float imageScaleFactor, CSSImageSetValue*);
+    StyleFetchedImageSet(ImageResource*, float imageScaleFactor, CSSImageSetValue*, const KURL&);
 
     ResourcePtr<ImageResource> m_bestFitImage;
     float m_imageScaleFactor;
 
     RawPtrWillBeMember<CSSImageSetValue> m_imageSetValue; // Not retained; it owns us.
+    KURL m_urlWithFragment;
 };
 
 DEFINE_STYLE_IMAGE_TYPE_CASTS(StyleFetchedImageSet, isImageResourceSet());