SVG object with same idrefs get conflicted even they are under different shadow root

third_party/WebKit/Source/core/svg/SVGFEImageElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
  * Copyright (C) 2010 Dirk Schulze <krit@webkit.org>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 78 matching lines @@
     clearResourceReferences();
     if (!inShadowIncludingDocument())
         return;
 
     AtomicString id;
     Element* target = SVGURIReference::targetElementFromIRIString(hrefString(), treeScope(), &id);
     if (!target) {
         if (id.isEmpty()) {
             fetchImageResource();
         } else {
-            document().accessSVGExtensions().addPendingResource(id, this);
+            treeScope().accessSVGTreeScopedResources().addPendingResource(id, this);
             ASSERT(hasPendingResources());
         }
     } else if (target->isSVGElement()) {
         // Register us with the target in the dependencies map. Any change of hrefElement
         // that leads to relayout/repainting now informs us, so we can react to it.
         addReferenceTo(toSVGElement(target));
     }
 
     invalidate();
 }
@@ skipping 48 matching lines @@
         // Don't use the broken image icon on image loading errors.
         RefPtr<Image> image = m_cachedImage->errorOccurred() ?
             nullptr : m_cachedImage->getImage();
         return FEImage::createWithImage(filter, image, m_preserveAspectRatio->currentValue());
     }
 
     return FEImage::createWithIRIReference(filter, treeScope(), hrefString(), m_preserveAspectRatio->currentValue());
 }
 
 } // namespace blink