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

samples/tests/samples/lib/layout/layout_test.dart

Index: samples/tests/samples/lib/layout/layout_test.dart
diff --git a/samples/tests/samples/lib/layout/layout_test.dart b/samples/tests/samples/lib/layout/layout_test.dart
index 031eb139530d684128601aa182a510f97b48ed45..ad6ba146a4419b73081ee8bc6b2fcdd9ce121dc3 100644
--- a/samples/tests/samples/lib/layout/layout_test.dart
+++ b/samples/tests/samples/lib/layout/layout_test.dart
@@ -4,6 +4,7 @@
 
 library layout_tests;
 
+import 'dart:async';
 import 'dart:html';
 import '../../../../swarm/swarm_ui_lib/base/base.dart';
 import '../../../../swarm/swarm_ui_lib/layout/layout.dart';
@@ -156,10 +157,10 @@ main() {
 usingGrid(String example, void test_(View grid)) {
   final grid = createGrid(GridExamples.styles[example]);
   grid.addToDocument(document.body);
-  window.setTimeout(() {
+  Timer.run(() {
     test_(grid);
-    window.setTimeout(expectAsync0(() { grid.removeFromDocument(); }), 0);
-  }, 0);
+    Timer.run(expectAsync0(() { grid.removeFromDocument(); }));
+  });
 }
 
 verifyGrid(String example, [Map expected = null]) {