Use an SVGElementProxy in ReferenceClipPathOperation

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

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Nikolas Zimmermann
  * <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2008 Rob Buis <buis@kde.org>
  * Copyright (C) 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Alp Toker <alp@atoker.com>
  * Copyright (C) 2009 Cameron McCormack <cam@mcc.id.au>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 1156 matching lines @@
                                       SVGNames::zAttr,
                                   }));
 
   if (name == classAttr)
     return true;
 
   return animatableAttributes.contains(name);
 }
 #endif  // DCHECK_IS_ON()
 
+SVGElementProxySet* SVGElement::elementProxySet() {
+  // Limit to specific element types.

[pdr., 2016/11/15 04:14:35]

Nit: the comment above SVGElementProxySet needs to be updated to mention
clippath. Maybe just point that comment to this code?

[fs, 2016/11/15 14:10:56]

Updated that comment to point to this method.

+  if (!isSVGFilterElement(*this) && !isSVGClipPathElement(*this))
+    return nullptr;
+  return &ensureSVGRareData()->ensureElementProxySet();
+}
+
 SVGElementSet* SVGElement::setOfIncomingReferences() const {
   if (!hasSVGRareData())
     return nullptr;
   return &svgRareData()->incomingReferences();
 }
 
 void SVGElement::addReferenceTo(SVGElement* targetElement) {
   ASSERT(targetElement);
 
   ensureSVGRareData()->outgoingReferences().add(targetElement);
@@ skipping 50 matching lines @@
   visitor->trace(m_className);
   Element::trace(visitor);
 }
 
 const AtomicString& SVGElement::eventParameterName() {
   DEFINE_STATIC_LOCAL(const AtomicString, evtString, ("evt"));
   return evtString;
 }
 
 }  // namespace blink