Re-instate geometry sharing optimization for 'd' on <use>'d <path>s

third_party/WebKit/Source/core/svg/SVGPathElement.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 22 matching lines @@
     DEFINE_WRAPPERTYPEINFO();
 public:
     DECLARE_NODE_FACTORY(SVGPathElement);
 
     Path asPath() const override;
 
     float getTotalLength();
     PassRefPtrWillBeRawPtr<SVGPointTearOff> getPointAtLength(float distance);
     unsigned getPathSegAtLength(float distance);
 
-    SVGAnimatedPath* path() { return m_path.get(); }
-    SVGAnimatedNumber* pathLength() { return m_pathLength.get(); }
+    SVGAnimatedPath* path() const { return m_path.get(); }
+    SVGAnimatedNumber* pathLength() const { return m_pathLength.get(); }
 
     const SVGPathByteStream& pathByteStream() const;
 
     bool isPresentationAttribute(const QualifiedName&) const override;
     bool isPresentationAttributeWithSVGDOM(const QualifiedName&) const override;
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     explicit SVGPathElement(Document&);
 
     void svgAttributeChanged(const QualifiedName&) override;
 
     void collectStyleForPresentationAttribute(const QualifiedName&, const AtomicString&, MutableStylePropertySet*) override;
 
     Node::InsertionNotificationRequest insertedInto(ContainerNode*) override;
     void removedFrom(ContainerNode*) override;
 
     void invalidateMPathDependencies();
 
     RefPtrWillBeMember<SVGAnimatedNumber> m_pathLength;
     RefPtrWillBeMember<SVGAnimatedPath> m_path;
 };
 
 } // namespace blink
 
 #endif // SVGPathElement_h