Use an SVGElementProxy in ReferenceClipPathOperation

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

Index: third_party/WebKit/Source/core/style/ClipPathOperation.h
diff --git a/third_party/WebKit/Source/core/style/ClipPathOperation.h b/third_party/WebKit/Source/core/style/ClipPathOperation.h
index 16405443cb531a41e8c76197864b4bb47463d7d1..e08e4d4f0fe46518fb4045b702eb14e198450c3e 100644
--- a/third_party/WebKit/Source/core/style/ClipPathOperation.h
+++ b/third_party/WebKit/Source/core/style/ClipPathOperation.h
@@ -31,6 +31,7 @@
 #define ClipPathOperation_h
 
 #include "core/style/BasicShapes.h"
+#include "core/svg/SVGElementProxy.h"
 #include "platform/graphics/Path.h"
 #include "wtf/PtrUtil.h"
 #include "wtf/RefCounted.h"
@@ -39,6 +40,10 @@
 
 namespace blink {
 
+class SVGElement;
+class SVGResourceClient;
+class TreeScope;
+
 class ClipPathOperation : public RefCounted<ClipPathOperation> {
  public:
   enum OperationType { REFERENCE, SHAPE };
@@ -61,25 +66,26 @@ class ReferenceClipPathOperation final : public ClipPathOperation {
  public:
   static PassRefPtr<ReferenceClipPathOperation> create(
       const String& url,
-      const AtomicString& fragment) {
-    return adoptRef(new ReferenceClipPathOperation(url, fragment));
+      SVGElementProxy& elementProxy) {
+    return adoptRef(new ReferenceClipPathOperation(url, elementProxy));
   }
 
+  void addClient(SVGResourceClient*);
+  void removeClient(SVGResourceClient*);
+
+  SVGElement* findElement(TreeScope&) const;
+
   const String& url() const { return m_url; }
-  const AtomicString& fragment() const { return m_fragment; }
 
  private:
-  bool operator==(const ClipPathOperation& o) const override {
-    return isSameType(o) &&
-           m_url == static_cast<const ReferenceClipPathOperation&>(o).m_url;
-  }
+  bool operator==(const ClipPathOperation&) const override;
   OperationType type() const override { return REFERENCE; }
 
-  ReferenceClipPathOperation(const String& url, const AtomicString& fragment)
-      : m_url(url), m_fragment(fragment) {}
+  ReferenceClipPathOperation(const String& url, SVGElementProxy& elementProxy)
+      : m_elementProxy(&elementProxy), m_url(url) {}
 
+  Persistent<SVGElementProxy> m_elementProxy;
   String m_url;
-  AtomicString m_fragment;
 };
 
 DEFINE_TYPE_CASTS(ReferenceClipPathOperation,