Mark several tests as failing after recent webkit merge and fix string concatenation in html_print.…

lib/unittest/html_print.dart

 // Copyright (c) 2011, 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.
 
 /** This file is sourced by both dom_config.dart and html_config.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) {
@@ skipping 47 matching lines @@
   }
 
   var html = '''
       <tr>
         <td>${test_.id}</td>
         <td class="unittest-${test_.result}">${test_.result.toUpperCase()}</td>
         <td>Expectation: ${test_.description}. ${_htmlEscape(test_.message)}</td>
       </tr>''';
 
   if (test_.stackTrace != null) {
-    html +=
-        '<tr><td></td><td colspan="2"><pre>${_htmlEscape(test_.stackTrace)}</pre></td></tr>';
+    html =
+        '$html<tr><td></td><td colspan="2"><pre>${_htmlEscape(test_.stackTrace)}</pre></td></tr>';
   }
 
   return html;
 }
 
 //TODO(pquitslund): Move to a common lib
 String _htmlEscape(String string) {
   return string.replaceAll('&', '&amp;')
                .replaceAll('<','&lt;')
                .replaceAll('>','&gt;');
 }