Reland of "Tracking reference filter mutation via SVGElementProxy"

third_party/WebKit/Source/core/css/resolver/ElementStyleResources.h

Index: third_party/WebKit/Source/core/css/resolver/ElementStyleResources.h
diff --git a/third_party/WebKit/Source/core/css/resolver/ElementStyleResources.h b/third_party/WebKit/Source/core/css/resolver/ElementStyleResources.h
index 25e75ef26c963353fe42110278bb06b0634bd83d..2d7dc04ea4655fb47fd77f20317e583670adbb2a 100644
--- a/third_party/WebKit/Source/core/css/resolver/ElementStyleResources.h
+++ b/third_party/WebKit/Source/core/css/resolver/ElementStyleResources.h
@@ -42,7 +42,7 @@ class CSSURIValue;
 class CSSValue;
 class ComputedStyle;
 class Document;
-class FilterOperation;
+class SVGElementProxy;
 class StyleImage;
 class StylePendingImage;
 
@@ -58,11 +58,10 @@ class ElementStyleResources {
   StyleImage* styleImage(CSSPropertyID, const CSSValue&);
   StyleImage* cachedOrPendingFromValue(CSSPropertyID, const CSSImageValue&);
   StyleImage* setOrPendingFromValue(CSSPropertyID, const CSSImageSetValue&);
+  SVGElementProxy& cachedOrPendingFromValue(const CSSURIValue&);
 
   void loadPendingResources(ComputedStyle*);
 
-  void addPendingSVGDocument(FilterOperation*, const CSSURIValue*);
-
  private:
   StyleImage* cursorOrPendingFromValue(CSSPropertyID,
                                        const CSSCursorImageValue&);
@@ -79,8 +78,6 @@ class ElementStyleResources {
 
   Member<Document> m_document;
   HashSet<CSSPropertyID> m_pendingImageProperties;
-  HeapHashMap<Member<FilterOperation>, Member<const CSSURIValue>>
-      m_pendingSVGDocuments;
   float m_deviceScaleFactor;
 };