Cleanup JS() expressions. New Constructor for JsObject that preserves the correct prototype. Type c…

tests/html/js_test.dart

 // Copyright (c) 2013, 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.
 
 library jsTest;
 
 import 'dart:async';
 import 'dart:html';
 import 'dart:js';
 
@@ skipping 310 matching lines @@
       final bufView = new JsObject(context['Uint8Array'], [buf]);
       for (var i = 0; i < codeUnits.length; i++) {
         bufView[i] = codeUnits[i];
       }
     }
   });
 
   test('js instantiation : >10 parameters', () {
     final o = new JsObject(context['Baz'], [1,2,3,4,5,6,7,8,9,10,11]);
     for (var i = 1; i <= 11; i++) {
-      o["f$i"] = i;
+      expect(o["f$i"], i);
     }
+    expect(o['constructor'], same(context['Baz']));
   });
 
   test('write global field', () {
     context['y'] = 42;
     expect(context['y'], equals(42));
   });
 
   test('get JS JsFunction', () {
     var razzle = context['razzle'];
     expect(razzle.apply(context), equals(42));
@@ skipping 161 matching lines @@
     expect(context.callMethod('Bar'), "ret_value");
     expect(context['Bar']['foo'], "property_value");
   });
 
   test('usage of Serializable', () {
     final red = Color.RED;
     context['color'] = red;
     expect(context['color'], equals(red._value));
   });
 }