Add test controller copy again

pkg/unittest/test_controller.js

 // 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.
 
+
+// TODO(sigmund): remove this file.
+// this file was moved inside the lib directory, but dartium bots are unhappy.
+// We need to fix some references pointing to this file in the dartium repo
+// first, and then we'll be able to remove this file.
+
 /**
  * Test controller logic - used by unit test harness to embed tests in
  * DumpRenderTree.
  */
 
 // Clear the console before every test run - this is Firebug specific code.
 if (typeof console == "object" && typeof console.clear == "function") {
   console.clear();
 }
 // Set window onerror to make sure that we catch test harness errors across all
@@ skipping 118 matching lines @@
 function dartMainRunner(main) {
   window.postMessage('dart-calling-main', '*');
   try {
     main();
   } catch (e) {
     window.postMessage('unittest-suite-fail', '*');
     return;
   }
   window.postMessage('dart-main-done', '*');
 }