[SVG2] Add onbegin, onend and onrepeat EventHandlers on SVGAnimationElement

Source/core/svg/SVGAnimationElement.h

Index: Source/core/svg/SVGAnimationElement.h
diff --git a/Source/core/svg/SVGAnimationElement.h b/Source/core/svg/SVGAnimationElement.h
index 27497789ff8481784928fd74d926fd8dfe340a21..4f03b801f9eb5d5d0ce4e1150a752c3695f1e3b6 100644
--- a/Source/core/svg/SVGAnimationElement.h
+++ b/Source/core/svg/SVGAnimationElement.h
@@ -74,6 +74,10 @@ public:
     void endElement();
     void endElementAt(float offset);
 
+    DEFINE_MAPPED_ATTRIBUTE_EVENT_LISTENER(begin, beginEvent);
+    DEFINE_MAPPED_ATTRIBUTE_EVENT_LISTENER(end, endEvent);
+    DEFINE_MAPPED_ATTRIBUTE_EVENT_LISTENER(repeat, repeatEvent);
+
     static bool isTargetAttributeCSSProperty(SVGElement*, const QualifiedName&);
 
     virtual bool isAdditive() const;