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

Source/bindings/scripts/CodeGeneratorV8.pm

 # Copyright (C) 2005, 2006 Nikolas Zimmermann <zimmermann@kde.org>
 # Copyright (C) 2006 Anders Carlsson <andersca@mac.com>
 # Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
 # Copyright (C) 2006 Alexey Proskuryakov <ap@webkit.org>
 # Copyright (C) 2006 Apple Computer, Inc.
 # Copyright (C) 2007, 2008, 2009, 2012 Google Inc.
 # Copyright (C) 2009 Cameron McCormack <cam@mcc.id.au>
 # Copyright (C) Research In Motion Limited 2010. All rights reserved.
 # Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
 # Copyright (C) 2012 Ericsson AB. All rights reserved.
@@ skipping 186 matching lines @@
 my %svgAnimatedTypeHash = ("SVGAnimatedAngle" => 1, "SVGAnimatedBoolean" => 1,
                            "SVGAnimatedEnumeration" => 1, "SVGAnimatedInteger" => 1,
                            "SVGAnimatedLength" => 1, "SVGAnimatedLengthList" => 1,
                            "SVGAnimatedNumber" => 1, "SVGAnimatedNumberList" => 1,
                            "SVGAnimatedPreserveAspectRatio" => 1,
                            "SVGAnimatedRect" => 1, "SVGAnimatedString" => 1,
                            "SVGAnimatedTransformList" => 1);
 
 my %svgAttributesInHTMLHash = ("class" => 1, "id" => 1, "onabort" => 1, "onclick" => 1,
                                "onerror" => 1, "onload" => 1, "onmousedown" => 1,
+                               "onmouseenter" => 1, "onmouseleave" => 1,
                                "onmousemove" => 1, "onmouseout" => 1, "onmouseover" => 1,
                                "onmouseup" => 1, "onresize" => 1, "onscroll" => 1,
                                "onunload" => 1);
 
 my %svgTypeNeedingTearOff = (
     "SVGAngle" => "SVGPropertyTearOff<SVGAngle>",
     "SVGLength" => "SVGPropertyTearOff<SVGLength>",
     "SVGLengthList" => "SVGListPropertyTearOff<SVGLengthList>",
     "SVGMatrix" => "SVGPropertyTearOff<SVGMatrix>",
     "SVGNumber" => "SVGPropertyTearOff<float>",
@@ skipping 5823 matching lines @@
         if ($currentInterface->extendedAttributes->{$extendedAttribute}) {
             $found = 1;
         }
         return 1 if $found;
     }, 0);
 
     return $found;
 }
 
 1;