Add test for garbage collected window event listeners issue.

tests/html/native_gc_test.dart

 #library('NativeGCTest');
 #import('../../lib/unittest/unittest.dart');
 #import('../../lib/unittest/html_config.dart');
 #import('dart:html');
 
 main() {
   useHtmlConfiguration();
 
+  Element testDiv = new DivElement();
+  testDiv.id = '#TestDiv';
+  document.body.nodes.add(testDiv);
+  window.on.message.add((e) => testDiv.click());
+
   test('EventListener', () {
       final int N = 1000000;
       final int M = 1000;
 
       var div;
       for (int i = 0; i < M; ++i) {
         // This memory should be freed when the listener below is
         // collected.
         List l = new List(N);
 
         // Record the iteration number.
         l[N - 1] = i;
 
         div = new Element.tag('div');
         div.on['test'].add((_) {
             // Only the final iteration's listener should be invoked.
             // Note: the reference to l keeps the entire list alive.
             Expect.equals(M - 1, l[N - 1]);
           }, false);
       }
 
       final event = new Event('test');
       div.on['test'].dispatch(event);
   });
+
+  test('WindowEventListener', () {
+    testDiv.on.click.add(expectAsync1((e) {}));

[Anton Muhin, 2012/07/06 15:06:15]

isn't it too fragile to depend on the test order?

[podivilov, 2012/07/06 16:08:19]

Done.

+    window.postMessage('test', '*');
+  });
 }