Reland of "Tracking reference filter mutation via SVGElementProxy"

third_party/WebKit/Source/core/style/FilterOperations.h

 /*
  * Copyright (C) 2011 Apple Inc. 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 14 matching lines @@
 
 #ifndef FilterOperations_h
 #define FilterOperations_h
 
 #include "core/CoreExport.h"
 #include "core/style/FilterOperation.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
+class SVGResourceClient;
+
 class CORE_EXPORT FilterOperations {
   DISALLOW_NEW();
 
  public:
   FilterOperations();
   FilterOperations(const FilterOperations& other) { *this = other; }
 
   FilterOperations& operator=(const FilterOperations&);
 
   bool operator==(const FilterOperations&) const;
@@ skipping 17 matching lines @@
   // Maps "forward" to determine which pixels in a destination rect are
   // affected by pixels in the source rect.
   // See also FilterEffect::mapRect.
   FloatRect mapRect(const FloatRect&) const;
 
   bool hasFilterThatAffectsOpacity() const;
   bool hasFilterThatMovesPixels() const;
 
   bool hasReferenceFilter() const;
 
+  void addClient(SVGResourceClient*) const;
+  void removeClient(SVGResourceClient*) const;
+
   DECLARE_TRACE();
 
  private:
   FilterOperationVector m_operations;
 };
 
 // Wrapper object for the FilterOperations part object.
 class FilterOperationsWrapper
     : public GarbageCollected<FilterOperationsWrapper> {
  public:
@@ skipping 14 matching lines @@
 
   explicit FilterOperationsWrapper(const FilterOperations& operations)
       : m_operations(operations) {}
 
   FilterOperations m_operations;
 };
 
 }  // namespace blink
 
 #endif  // FilterOperations_h