adding HtmlEscape to dart:convert

pkg/unittest/lib/html_config.dart

 // Copyright (c) 2013, 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.
 
 /**
  * A simple unit test library for running tests in a browser.
  */
 library unittest_html_config;
 
 import 'dart:async';
+import 'dart:convert';
 import 'dart:html';
 import 'unittest.dart';
 
 /** Creates a table showing tests results in HTML. */
 void _showResultsInPage(int passed, int failed, int errors,
     List<TestCase> results, bool isLayoutTest, String uncaughtError) {
   if (isLayoutTest && (passed == results.length) && uncaughtError == null) {
     document.body.innerHtml = "PASS";
   } else {
     var newBody = new StringBuffer();
@@ skipping 48 matching lines @@
           <td>${test_.id}</td>
           <td class="unittest-error">NO STATUS</td>
           <td>Test did not complete</td>
         </tr>''';
   }
 
   var html = '''
       <tr>
         <td>${test_.id}</td>
         <td class="unittest-${test_.result}">${test_.result.toUpperCase()}</td>
-        <td>Expectation: <a href="#testFilter=${test_.description}">${test_.description}</a>. ${_htmlEscape(test_.message)}</td>
+        <td>Expectation: <a href="#testFilter=${test_.description}">${test_.description}</a>. ${HTML_ESCAPE.convert(test_.message)}</td>
       </tr>''';
 
   if (test_.stackTrace != null) {
     html = '$html<tr><td></td><td colspan="2"><pre>' +
-        _htmlEscape(test_.stackTrace.toString()) +
+        HTML_ESCAPE.convert(test_.stackTrace.toString()) +
         '</pre></td></tr>';
   }
 
   return html;
 }
 
-//TODO(pquitslund): Move to a common lib
-String _htmlEscape(String string) {
-  return string.replaceAll('&', '&amp;')
-               .replaceAll('<','&lt;')
-               .replaceAll('>','&gt;');
-}
-
 class HtmlConfiguration extends SimpleConfiguration {
   /** Whether this is run within dartium layout tests. */
   final bool _isLayoutTest;
   HtmlConfiguration(this._isLayoutTest);
 
   StreamSubscription<Event> _onErrorSubscription;
   StreamSubscription<Event> _onMessageSubscription;
 
   void _installHandlers() {
     if (_onErrorSubscription == null) {
@@ skipping 61 matching lines @@
     window.postMessage('unittest-suite-done', '*');
   }
 }
 
 void useHtmlConfiguration([bool isLayoutTest = false]) {
   unittestConfiguration = isLayoutTest ? _singletonLayout : _singletonNotLayout;
 }
 
 final _singletonLayout = new HtmlConfiguration(true);
 final _singletonNotLayout = new HtmlConfiguration(false);