This required munging a bit of test.dart code too to tease out some
dependencies, but the changes are minor. I considered moving all of
test.dart out into a package and making the status file library a
public one that other packages in the repo could import but this seemed
like the less intrusive change.
R=bkonyi@google.com
Review-Url: https://codereview.chromium.org/2984203002 .
Bob Nystrom