Combine window.setTimeout/setInterval with Timer and Timer.repeating. Also

samples/dartcombat/views.dart

Index: samples/dartcombat/views.dart
diff --git a/samples/dartcombat/views.dart b/samples/dartcombat/views.dart
index 3ccf0b3af27bf30449ec157f7717de2982edfbc5..15e598c4f59e1c258cc8e052a1fe9c9714cc4359 100644
--- a/samples/dartcombat/views.dart
+++ b/samples/dartcombat/views.dart
@@ -279,7 +279,7 @@ class ViewUtil {
   /** Extract the position of a mouse event in a containing 500x500 grid. */
   static Future<List<int>> positionFromEvent(Element gridNode, MouseEvent e) {
     final completer = new Completer<List<int>>();
-    window.setImmediate(() {
+    window.immediate.then((_) {
       int x = (e.pageX - gridNode.offsetLeft) ~/ 50;
       int y = (e.pageY - gridNode.offsetTop) ~/ 50;
       completer.complete([x, y]);