Browser compat for window.requestAnimationFrame

client/tests/client/html/RequestAnimationFrameTest.dart

+// 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.
+
+#library('RequestAnimationFrameTest');
+#import('../../../../lib/unittest/unittest.dart');
+#import('../../../../lib/unittest/html_config.dart');
+#import('dart:html');
+
+main() {
+  useHtmlConfiguration();
+
+  asyncTest('oneShot', 1, () {
+      var frame = window.requestAnimationFrame(
+          (timestamp) { callbackDone(); });
+    });
+
+  asyncTest('twoShot', 1, () {
+      var frame = window.requestAnimationFrame(
+          (timestamp1) {
+            window.requestAnimationFrame(
+                (timestamp2) {
+                  Expect.isTrue(timestamp2 > timestamp1, 'timestamps ordered');
+                  callbackDone();
+                });
+          });
+    });
+}