SVG objects with same idrefs conflict when under different shadow root

third_party/WebKit/Source/core/layout/svg/LayoutSVGResourceContainer.h

 /*
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #ifndef LayoutSVGResourceContainer_h
 #define LayoutSVGResourceContainer_h
 
 #include "core/layout/svg/LayoutSVGHiddenContainer.h"
-#include "core/svg/SVGDocumentExtensions.h"
+#include "core/svg/SVGTreeScopeResources.h"
 
 namespace blink {
 
 class SVGElementProxySet;
 
 enum LayoutSVGResourceType {
   MaskerResourceType,
   MarkerResourceType,
   PatternResourceType,
   LinearGradientResourceType,
@@ skipping 78 matching lines @@
   HashSet<LayoutObject*> m_clients;
 };
 
 inline LayoutSVGResourceContainer* getLayoutSVGResourceContainerById(
     TreeScope& treeScope,
     const AtomicString& id) {
   if (id.isEmpty())
     return nullptr;
 
   if (LayoutSVGResourceContainer* layoutResource =
-          treeScope.document().accessSVGExtensions().resourceById(id))
+          treeScope.ensureSVGTreeScopedResources().resourceById(id))
     return layoutResource;
 
   return nullptr;
 }
 
 template <typename Layout>
 Layout* getLayoutSVGResourceById(TreeScope& treeScope, const AtomicString& id) {
   if (LayoutSVGResourceContainer* container =
           getLayoutSVGResourceContainerById(treeScope, id)) {
     if (container->resourceType() == Layout::s_resourceType)
       return static_cast<Layout*>(container);
   }
   return nullptr;
 }
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutSVGResourceContainer,
                                 isSVGResourceContainer());
 
 #define DEFINE_LAYOUT_SVG_RESOURCE_TYPE_CASTS(thisType, typeName)   \
   DEFINE_TYPE_CASTS(thisType, LayoutSVGResourceContainer, resource, \
                     resource->resourceType() == typeName,           \
                     resource.resourceType() == typeName)
 
 }  // namespace blink
 
 #endif