Adding `content_security_policy` to a few sample extensions

chrome/common/extensions/docs/examples/extensions/ttsdebug/ttsdebug.js

 /**
  * Copyright (c) 2011 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 var voiceArray;
 var trials = 3;
 var resultMap = {};
 var updateDependencyFunctions = [];
@@ skipping 659 matching lines @@
       }
       opt.setAttribute('value', name);
       opt.innerText = voiceArray[i].voiceName;
       $('voices').appendChild(opt);
     }
   });
   $('voices').addEventListener('change', function() {
     var i = $('voices').selectedIndex;
     localStorage['voice'] = $('voices').item(i).value;
   }, false);
+  $('stop').addEventListener('click', stop);
 
   for (var i = 0; i < tests.length; i++) {
     registerTest(tests[i]);
   }
   updateDependencies();
 }
 
 function stop() {
   console.log('*** Emergency stop!');
   emergencyStop = true;
   chrome.tts.stop();
 }
+
+document.addEventListener('DOMContentLoaded', load);