Add test controller copy again

pkg/unittest/test_controller.js

Index: pkg/unittest/test_controller.js
diff --git a/pkg/unittest/lib/test_controller.js b/pkg/unittest/test_controller.js
similarity index 94%
copy from pkg/unittest/lib/test_controller.js
copy to pkg/unittest/test_controller.js
index 5332c190554559ef26e289ff9a5c4727951e0fba..eb8848da02c1b889a79751a0b94afb926d1142f5 100644
--- a/pkg/unittest/lib/test_controller.js
+++ b/pkg/unittest/test_controller.js
@@ -2,6 +2,12 @@
 // 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.