Reland of "Tracking reference filter mutation via SVGElementProxy"

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

Index: third_party/WebKit/Source/core/svg/SVGResourceClient.h
diff --git a/third_party/WebKit/Source/core/svg/SVGResourceClient.h b/third_party/WebKit/Source/core/svg/SVGResourceClient.h
index 58b4f5378f9c9a8ee6f2412c75245c6a397f413d..e3f8ec0b36da34d7b73629f4ce5094e695ee0834 100644
--- a/third_party/WebKit/Source/core/svg/SVGResourceClient.h
+++ b/third_party/WebKit/Source/core/svg/SVGResourceClient.h
@@ -7,35 +7,26 @@
 
 #include "core/CoreExport.h"
 #include "core/fetch/DocumentResource.h"
-#include "core/svg/SVGFilterElement.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
-class Document;
-class FilterOperations;
+class TreeScope;
 
 class CORE_EXPORT SVGResourceClient : public DocumentResourceClient {
-  USING_PRE_FINALIZER(SVGResourceClient, clearFilterReferences);
-
  public:
-  SVGResourceClient();
-  ~SVGResourceClient() override;
-  void addFilterReferences(const FilterOperations&, const Document&);
-  void clearFilterReferences();
-
-  virtual void filterNeedsInvalidation() = 0;
+  virtual ~SVGResourceClient() {}
 
-  void filterWillBeDestroyed(SVGFilterElement*);
+  virtual TreeScope* treeScope() = 0;
 
-  void notifyFinished(Resource*) override;
-  String debugName() const override { return "SVGResourceClient"; }
+  virtual void resourceContentChanged() = 0;
+  virtual void resourceElementChanged() = 0;
 
-  DECLARE_TRACE();
+ protected:
+  SVGResourceClient() {}
 
- private:
-  HeapHashSet<WeakMember<SVGFilterElement>> m_internalFilterReferences;
-  HeapVector<Member<DocumentResource>> m_externalFilterReferences;
+  String debugName() const override { return "SVGResourceClient"; }
+  void notifyFinished(Resource*) override { resourceElementChanged(); }
 };
 
 }  // namespace blink