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

Source/core/svg/SVGAnimationElement.idl

Index: Source/core/svg/SVGAnimationElement.idl
diff --git a/Source/core/svg/SVGAnimationElement.idl b/Source/core/svg/SVGAnimationElement.idl
index 945a2a358f5bc52b35216ae154fb10ae731fae44..babea0821e1e7af242801a270390593715583521 100644
--- a/Source/core/svg/SVGAnimationElement.idl
+++ b/Source/core/svg/SVGAnimationElement.idl
@@ -35,6 +35,10 @@ interface SVGAnimationElement : SVGElement {
     void beginElementAt([Default=Undefined] optional float offset);
     void endElement();
     void endElementAt([Default=Undefined] optional float offset);
+
+    attribute EventHandler onbegin;
+    attribute EventHandler onend;
+    attribute EventHandler onrepeat;
 };
 
 SVGAnimationElement implements SVGTests;