Isolates in frog - tweaks in existing js code to make things run

frog/lib/core.js

 // 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.
 
 // TODO(jimhug): Completeness - see tests/corelib
 
 /** Implements extends for dart classes on javascript prototypes. */
 function $inherits(child, parent) {
   if (child.prototype.__proto__) {
     child.prototype.__proto__ = parent.prototype;
@@ skipping 311 matching lines @@
 }
 
 function $varMethod(name, methods) {
   Object.prototype[name] = function() {
     $patchMethod(this, name, methods);
     this[name].apply(this, Array.prototype.slice.call(arguments));
   };
 }
 
 Object.prototype.get$typeName = function() {
-  // TODO(vsm): how can we make this go down the fast path for Chrome?
-  //(for Chrome: return this.constructor.name;)
+  // TODO(sigmund): find a way to make this work on all browsers, including
+  // checking the typeName on prototype objects (so we can fix dynamic
+  // dispatching on $varMethod).
+  if (window.constructor.name == 'DOMWindow') { // fast-path for Chrome
+    return this.constructor.name;
+  }
   var str = Object.prototype.toString.call(this);
   return str.substring(8, str.length - 1);
 }
 
 function $patchMethod(obj, name, methods) {
   // Get the prototype to patch.
   // Don't overwrite an existing stub, like the one on Object.prototype
   var proto = Object.getPrototypeOf(obj);
   if (!proto || proto.hasOwnProperty(name)) proto = obj;
   var method;
   while (obj && !(method = methods[obj.get$typeName()])) {
     obj = Object.getPrototypeOf(obj);
   }
-  Object.defineProperty(proto, name, {value: method || methods['Object']});
+  obj[name] = method || methods['Object'];
 }