Tell the testing-framework that we started the tests.

client/testing/unittest/unittest.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.
 
 /**
  * A simple unit test library for running tests in a browser.
  */
 #library("unittest");
 
 #import("dart:dom");
@@ skipping 20 matching lines @@
     _state = _UNCAUGHT_ERROR;
     if (testCase.callbacks > 0) {
       _currentTest++;
       _nextBatch();
     }
   }
 }
 
 /** Runs all queued tests, one at a time. */
 _platformStartTests() {
-  window.postMessage('unittest-suite-start', '*');
+  window.postMessage('unittest-suite-wait-for-done', '*');
 
   // Listen for uncaught errors.
   window.onerror = _onErrorClosure;
 }
 
 _platformCompleteTests(int testsPassed, int testsFailed, int testsErrors) {
   window.onerror = null;
 
   if (_isLayoutTest && testsPassed == _tests.length) {
     document.body.innerHTML = "PASS";
@@ skipping 43 matching lines @@
         <td>Expectation: ${test.description}. ${test.message}</td>
       </tr>''';
 
   if (test.stackTrace != null) {
     html +=
         '<tr><td></td><td colspan="2"><pre>${test.stackTrace}</pre></td></tr>';
   }
 
   return html;
 }