Add bazel worker support to the dev compiler.

test/worker/hello_world.dart

Index: test/worker/hello_world.dart
diff --git a/test/codegen/language/failing_main.dart b/test/worker/hello_world.dart
similarity index 63%
copy from test/codegen/language/failing_main.dart
copy to test/worker/hello_world.dart
index 3b922772f8560f4b8395bd0661845c40c3bd0c54..7b2581a615804a9fc9fb54044c834b6fee7f7686 100644
--- a/test/codegen/language/failing_main.dart
+++ b/test/worker/hello_world.dart
@@ -1,7 +1,7 @@
-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2016, 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.
 
 main() {
-  Expect.equals(true, false);
+  print('hello world!');
 }