Converted Observatory cpu-profile element

runtime/observatory/tests/observatory_ui/isolate/isolate-shared-summary/element_test.dart

 // Copyright (c) 2016, 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.
+
 import 'dart:html';
 import 'package:unittest/unittest.dart';
 import 'package:observatory/src/elements/isolate/counter_chart.dart';
 import 'package:observatory/src/elements/isolate/shared_summary.dart';
 import '../../mocks.dart';
 
 main() {
   IsolateSharedSummaryElement.tag.ensureRegistration();
 
   final cTag = IsolateCounterChartElement.tag.name;
 
   const isolate = const IsolateMock();
   test('instantiation', () {
     final e = new IsolateSharedSummaryElement(isolate);
     expect(e, isNotNull, reason: 'element correctly created');
   });
   test('elements created', () async {
     final e = new IsolateSharedSummaryElement(isolate);
     document.body.append(e);
     await e.onRendered.first;
     expect(e.children.length, isNonZero, reason: 'has elements');
     expect(e.querySelectorAll(cTag).length, equals(1));
     e.remove();
     await e.onRendered.first;
     expect(e.children.length, isZero, reason: 'is empty');
   });
 }