Generate toSVGGradient|Graphics|PolyElement()

Source/core/svg/SVGGradientElement.h

Index: Source/core/svg/SVGGradientElement.h
diff --git a/Source/core/svg/SVGGradientElement.h b/Source/core/svg/SVGGradientElement.h
index 65f92d05aedfab8503c226a5d65075d34449bd04..fa520c0cb0a7633538a352e6de074f94b1104471 100644
--- a/Source/core/svg/SVGGradientElement.h
+++ b/Source/core/svg/SVGGradientElement.h
@@ -107,12 +107,13 @@ private:
     END_DECLARE_ANIMATED_PROPERTIES
 };
 
-inline SVGGradientElement* toSVGGradientElement(Node* node)
+inline bool isSVGGradientElement(const Node& node)
 {
-    ASSERT_WITH_SECURITY_IMPLICATION(!node || (node->hasTagName(SVGNames::radialGradientTag) || node->hasTagName(SVGNames::linearGradientTag)));
-    return static_cast<SVGGradientElement*>(node);
+    return node.hasTagName(SVGNames::radialGradientTag) || node.hasTagName(SVGNames::linearGradientTag);
 }
 
+DEFINE_NODE_TYPE_CASTS_WITH_FUNCTION(SVGGradientElement);
+
 } // namespace WebCore
 
 #endif