Add support in test scripts backend for simple HTML tests.

tools/testing/dart/test_controller.js

 // 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.
 
 /*
  * The communication protocol between test_controller.js and the driving
  * page are JSON encoded messages of the following form:
  *   message = {
  *      is_first_message: true/false,
  *      is_status_update: true/false,
@@ skipping 16 matching lines @@
  *   {
  *     'type' : 'sync_exception' / 'window_onerror' / 'script_onerror' / 'print'
  *              'window_compilationerror' / 'message_received' / 'dom' / 'debug'
  *     'value' : 'some content',
  *     'timestamp' : TimestampInMs,
  *   }
  */
 var recordedEventList = [];
 var timestampOfFirstEvent = null;
 
-var STATUS_UPDATE_INTERVALL = 10000;
+var STATUS_UPDATE_INTERVAL = 10000;
 
 function getCurrentTimestamp() {
   if (timestampOfFirstEvent == null) {
     timestampOfFirstEvent = new Date().getTime();
   }
   return (new Date().getTime() - timestampOfFirstEvent) / 1000.0;
 }
 
 function stringifyEvent(event) {
   return JSON.stringify(event, null, 2);
@@ skipping 145 matching lines @@
   }
 }
 
 function notifyDone(testOutcome) {
   notifyUpdate(testOutcome, false, false, true);
 }
 
 // Repeatedly send back the current status of this test.
 function sendStatusUpdate(isFirstMessage) {
   notifyUpdate('', isFirstMessage, true, false);
-  setTimeout(function() {sendStatusUpdate(false)}, STATUS_UPDATE_INTERVALL);
+  setTimeout(function() {sendStatusUpdate(false)}, STATUS_UPDATE_INTERVAL);
 }
 
 // We call notifyStart here to notify the encapsulating browser.
 recordEvent('debug', 'test_controller.js started');
 sendStatusUpdate(true);
 
 function processMessage(msg) {
   // Filter out ShadowDOM polyfill messages which are random floats.
   if (msg != parseFloat(msg)) {
     recordEvent('message_received', '' + msg);
@@ skipping 95 matching lines @@
   dartPrint('dart-calling-main');
   try {
     main();
   } catch (e) {
     recordEvent('sync_exception', 'Exception: ' + e + '\nStack: ' + e.stack);
     notifyDone('FAIL');
     return;
   }
   dartPrint('dart-main-done');
 }