Split up element_animate_test into groups to get more information about what might be timing out

tests/html/element_animate_test.dart

 // Copyright (c) 2015, 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 element_animate_test;
 
 import 'dart:async';
 import 'dart:html';
 import 'package:unittest/html_individual_config.dart';
 import 'package:unittest/unittest.dart';
 
 main() {
   useHtmlIndividualConfiguration();
 
   group('animate_supported', () {
     test('supported', () {
       expect(Notification.supported, true);
     });
+  });
 
+  group('simple_timing', () {
     test('simple timing', () {
       var body = document.body;
       var opacity = num.parse(body.getComputedStyle().opacity);
       body.animate([{"opacity": 100}, {"opacity": 0}], 100);
       var newOpacity = num.parse(body.getComputedStyle().opacity);
       expect(newOpacity < opacity, isTrue);
     });
+  });
 
+  group('timing_dict', () {
     test('timing dict', () {
       var body = document.body;
       // Animate different characteristics so the tests can run concurrently.
       var fontSize = body.getComputedStyle().fontSize;
       var player = body.animate(
-          [{"font-size": "500px"}, {"font-size": fontSize}],
-          {"duration": 100});
+          [{"font-size": "500px"}, {"font-size": fontSize}], {"duration": 100});
       var newFontSize = body.getComputedStyle().fontSize;
       // Don't bother to parse to numbers, as long as it's changed that
       // indicates something is happening.
       expect(newFontSize == fontSize, isFalse);
       player.on['finish'].listen(expectAsync((_) => 'done'));
     });
+  });
 
+  group('omit_timing', () {
     test('omit timing', () {
       var body = document.body;
       var player = body.animate([
         {"transform": "translate(100px, -100%)"},
         {"transform": "translate(400px, 500px)"}
       ]);
       player.on['finish'].listen(expectAsync((_) => 'done'));
     });
   });
 }