Reland of "Tracking reference filter mutation via SVGElementProxy"

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

 /*
  * Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
  * Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
  * 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.
@@ skipping 16 matching lines @@
 #include "core/SVGNames.h"
 #include "core/svg/SVGAnimatedEnumeration.h"
 #include "core/svg/SVGAnimatedLength.h"
 #include "core/svg/SVGElement.h"
 #include "core/svg/SVGURIReference.h"
 #include "core/svg/SVGUnitTypes.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
-class SVGResourceClient;
+class SVGElementProxySet;
 
 class CORE_EXPORT SVGFilterElement final : public SVGElement,
                                            public SVGURIReference {
   DEFINE_WRAPPERTYPEINFO();
   USING_GARBAGE_COLLECTED_MIXIN(SVGFilterElement);
 
  public:
   DECLARE_NODE_FACTORY(SVGFilterElement);
   DECLARE_VIRTUAL_TRACE();
 
   ~SVGFilterElement() override;
 
-  void addClient(SVGResourceClient*);
-  void removeClient(SVGResourceClient*);
+  SVGElementProxySet& elementProxySet();
 
   SVGAnimatedLength* x() const { return m_x.get(); }
   SVGAnimatedLength* y() const { return m_y.get(); }
   SVGAnimatedLength* width() const { return m_width.get(); }
   SVGAnimatedLength* height() const { return m_height.get(); }
   SVGAnimatedEnumeration<SVGUnitTypes::SVGUnitType>* filterUnits() {
     return m_filterUnits.get();
   }
   SVGAnimatedEnumeration<SVGUnitTypes::SVGUnitType>* primitiveUnits() {
     return m_primitiveUnits.get();
@@ skipping 11 matching lines @@
 
   bool selfHasRelativeLengths() const override;
 
   Member<SVGAnimatedLength> m_x;
   Member<SVGAnimatedLength> m_y;
   Member<SVGAnimatedLength> m_width;
   Member<SVGAnimatedLength> m_height;
   Member<SVGAnimatedEnumeration<SVGUnitTypes::SVGUnitType>> m_filterUnits;
   Member<SVGAnimatedEnumeration<SVGUnitTypes::SVGUnitType>> m_primitiveUnits;
 
-  HeapHashSet<WeakMember<SVGResourceClient>> m_clientsToAdd;
+  Member<SVGElementProxySet> m_elementProxySet;
 };
 
 }  // namespace blink
 
 #endif  // SVGFilterElement_h