Print a count of total tests and expected failures in completion tests.

R=brianwilkerson@google.com

Review URL: https://codereview.chromium.org//806413003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@42441 260f80e4-7a28-3924-810f-c04153c831b5
Ensure shutdown is always called

R=paulberry@google.com

Review URL: https://codereview.chromium.org//814453003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@42442 260f80e4-7a28-3924-810f-c04153c831b5