Support timers in DOM isolates.

lib/html/dartium/html_dartium.dart

Index: lib/html/dartium/html_dartium.dart
diff --git a/lib/html/dartium/html_dartium.dart b/lib/html/dartium/html_dartium.dart
index dfe5957191db7b9f31f649ace41ebe4a3fed4650..19ab8a9d7aef104b443e66263a6e994d5c0579e1 100644
--- a/lib/html/dartium/html_dartium.dart
+++ b/lib/html/dartium/html_dartium.dart
@@ -40565,6 +40565,35 @@ interface ReadyState {
    */
   static final String COMPLETE = "complete";
 }
+// Copyright (c) 2012, 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(antonm): support not DOM isolates too.
+class _Timer implements Timer {
+  final canceller;
+
+  _Timer(this.canceller);
+
+  void cancel() { canceller(); }
+}
+
+_getTimerFactoryClosure() =>
+  (int milliSeconds, void callback(Timer timer), bool repeating) {
+    var maker;
+    var canceller;
+    if (repeating) {
+      maker = window.setInterval;
+      canceller = window.clearInterval;
+    } else {
+      maker = window.setTimeout;
+      canceller = window.clearTimeout;
+    }
+    Timer timer;
+    final int id = maker(() { callback(timer); }, milliSeconds);
+    timer = new _Timer(() { canceller(id); });
+    return timer;
+  };
 // 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.