Reland of "Tracking reference filter mutation via SVGElementProxy"

third_party/WebKit/Source/core/paint/PaintLayerFilterInfo.h

 /*
  * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above
  *    copyright notice, this list of conditions and the following
  *    disclaimer.
@@ skipping 19 matching lines @@
 #ifndef PaintLayerFilterInfo_h
 #define PaintLayerFilterInfo_h
 
 #include "core/svg/SVGResourceClient.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Noncopyable.h"
 
 namespace blink {
 
 class FilterEffect;
-class FilterOperations;
 class PaintLayer;
 
 // PaintLayerFilterInfo holds the filter information for painting.
 // https://drafts.fxtf.org/filters/
 //
 // Because PaintLayer is not allocated for SVG objects, SVG filters (both
 // software and hardware-accelerated) use a different code path to paint the
 // filters (SVGFilterPainter), but both code paths use the same abstraction for
 // painting non-hardware accelerated filters (FilterEffect). Hardware
 // accelerated CSS filters use CompositorFilterOperations, that is backed by cc.
 //
 class PaintLayerFilterInfo final
     : public GarbageCollectedFinalized<PaintLayerFilterInfo>,
       public SVGResourceClient {
   WTF_MAKE_NONCOPYABLE(PaintLayerFilterInfo);
   USING_GARBAGE_COLLECTED_MIXIN(PaintLayerFilterInfo);
 
  public:
   explicit PaintLayerFilterInfo(PaintLayer*);
   ~PaintLayerFilterInfo() override;
 
-  FilterEffect* lastEffect() const { return m_lastEffect; }
   void setLastEffect(FilterEffect*);
+  FilterEffect* lastEffect() const;
+  void invalidateFilterChain();
 
-  void updateReferenceFilterClients(const FilterOperations&);
   void clearLayer() { m_layer = nullptr; }
 
-  void filterNeedsInvalidation() override;
+  TreeScope* treeScope() override;
+
+  void resourceContentChanged() override;
+  void resourceElementChanged() override;
 
   DECLARE_TRACE();
 
  private:
   // |clearLayer| must be called before *m_layer becomes invalid.
   PaintLayer* m_layer;
   Member<FilterEffect> m_lastEffect;
 };
 
 }  // namespace blink
 
 #endif  // PaintLayerFilterInfo_h