Add debug info the test_controller.js

Add debug info the test_controller.js

This is to get more info on issue 13292

R=kustermann@google.com

Committed: https://code.google.com/p/dart/source/detail?r=27472

[kustermann, 2013-09-13 10:40:47]

lgtm

[ricow1, 2013-09-13 10:45:34]

Committed patchset #1 manually as r27472 (presubmit successful).

[Siggi Cherem (dart-lang), 2013-09-13 15:19:54]

lgtm

Thanks for investigating!