Support for observable models, fixes #259

test/data/input/escape_uri_test.html

Index: test/data/input/escape_uri_test.html
diff --git a/test/data/input/escape_uri_test.html b/test/data/input/escape_uri_test.html
index 03c52fce2b80a8c7129d7e4cd0605660ccb6db03..9408c7779f6510d0703563a522a114b4af1fa4f4 100644
--- a/test/data/input/escape_uri_test.html
+++ b/test/data/input/escape_uri_test.html
@@ -18,6 +18,7 @@ BSD-style license that can be found in the LICENSE file.
   <a href="javascript:{{m3}}"></a>
   <a href="javascript:{{m4}}"></a>
   <script type="application/dart">
+  @observable library main;
   import 'dart:html';
   import 'package:web_ui/safe_html.dart';
 
@@ -32,7 +33,7 @@ BSD-style license that can be found in the LICENSE file.
         tag.dispatchEvent(new MouseEvent('click', detail: 1));
       });
 
-      window.setTimeout(() => window.postMessage('done', '*'), 0);
+      window.setImmediate(() => window.postMessage('done', '*'));
     }, 0);
   }
   </script>