Reland of "Tracking reference filter mutation via SVGElementProxy"

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

 /*
  * Copyright (C) 2006 Apple Inc. All rights reserved.
  * Copyright (C) 2006, 2008 Nikolas Zimmermann <zimmermann@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 14 matching lines @@
 #include "platform/geometry/FloatPoint.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Forward.h"
 #include "wtf/HashMap.h"
 #include "wtf/HashSet.h"
 #include "wtf/text/AtomicStringHash.h"
 
 namespace blink {
 
 class Document;
+class Element;
 class LayoutSVGResourceContainer;
+class SVGElement;
+class SVGSVGElement;
 class SubtreeLayoutScope;
-class SVGSVGElement;
-class SVGElement;
-class Element;
 
 class SVGDocumentExtensions
     : public GarbageCollectedFinalized<SVGDocumentExtensions> {
   WTF_MAKE_NONCOPYABLE(SVGDocumentExtensions);
 
  public:
   typedef HeapHashSet<Member<Element>> SVGPendingElements;
   explicit SVGDocumentExtensions(Document*);
   ~SVGDocumentExtensions();
 
@@ skipping 28 matching lines @@
   void startPan(const FloatPoint& start);
   void updatePan(const FloatPoint& pos) const;
 
   static SVGSVGElement* rootElement(const Document&);
   SVGSVGElement* rootElement() const;
 
   DECLARE_TRACE();
 
  private:
   Member<Document> m_document;
-  // For SVG 1.2 support this will need to be made more general.
   HeapHashSet<Member<SVGSVGElement>> m_timeContainers;
   using SVGElementSet = HeapHashSet<Member<SVGElement>>;
   SVGElementSet m_webAnimationsPendingSVGElements;
   HashMap<AtomicString, LayoutSVGResourceContainer*> m_resources;
   // Resources that are pending.
   HeapHashMap<AtomicString, Member<SVGPendingElements>> m_pendingResources;
   SVGResourcesCache m_resourcesCache;
   // Root SVG elements with relative length descendants.
   HeapHashSet<Member<SVGSVGElement>> m_relativeLengthSVGRoots;
   FloatPoint m_translate;
@@ skipping 13 matching lines @@
   void clearHasPendingResourcesIfPossible(Element*);
   void removeElementFromPendingResources(Element*);
   SVGPendingElements* removePendingResource(const AtomicString& id);
 
   void serviceAnimations();
 };
 
 }  // namespace blink
 
 #endif