Implement 'mouseenter' and 'mouseleave' from DOM Level 3 Events.

Source/core/svg/SVGElement.cpp

Index: Source/core/svg/SVGElement.cpp
diff --git a/Source/core/svg/SVGElement.cpp b/Source/core/svg/SVGElement.cpp
index c73ef14d5ad4464a4882fb2687a9e5c27a929326..8c4065c22ea0c8c5f087a337098f3af2ebb2f308 100644
--- a/Source/core/svg/SVGElement.cpp
+++ b/Source/core/svg/SVGElement.cpp
@@ -319,6 +319,10 @@ void SVGElement::parseAttribute(const QualifiedName& name, const AtomicString& v
         setAttributeEventListener(eventNames().clickEvent, createAttributeEventListener(this, name, value));
     else if (name == onmousedownAttr)
         setAttributeEventListener(eventNames().mousedownEvent, createAttributeEventListener(this, name, value));
+    else if (name == onmouseenterAttr)
+        setAttributeEventListener(eventNames().mouseenterEvent, createAttributeEventListener(this, name, value));
+    else if (name == onmouseleaveAttr)
+        setAttributeEventListener(eventNames().mouseleaveEvent, createAttributeEventListener(this, name, value));
     else if (name == onmousemoveAttr)
         setAttributeEventListener(eventNames().mousemoveEvent, createAttributeEventListener(this, name, value));
     else if (name == onmouseoutAttr)