Add some sweet XML classes.

frog/corejs.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * Generates JS helpers for dart:core. This used to be in a file "core.js".
  * Having them in Dart code means we can easily control which are generated.
  */
 // TODO(jmesserly): one idea to make this cleaner: put these as private "native"
 // methods somewhere in a library that we import. This would be rather elegant
@@ skipping 390 matching lines @@
     // we have to fall through to the toString() based implementation
     // below in that case.
     if (name && typeof(name) == 'string' && name != 'Object') return name;
   }
   var string = Object.prototype.toString.call(this);
   var name = string.substring(8, string.length - 1);
   if (name == 'Window') {
     name = 'DOMWindow';
   } else if (name == 'Document') {
     name = 'HTMLDocument';
+  } else if (name == 'XMLDocument') {
+    name = 'Document';
   }
   return name;
 });""";
 
 /** Snippet for `$inherits`. */
 final String _INHERITS_FUNCTION = @"""
 /** Implements extends for Dart classes on JavaScript prototypes. */
 function $inherits(child, parent) {
   if (child.prototype.__proto__) {
     child.prototype.__proto__ = parent.prototype;
@@ skipping 134 matching lines @@
       bound.$length = Math.max(0, funcLength - (argsLength - 1));
       return bound;
     } else {
       var bound = function() {
         return func.apply(thisObj, arguments);
       };
       bound.$length = funcLength;
       return bound;
     }
   };""";