"random" is used where the bug is likely in the test, or the test was already
random on other platforms because the feature was not complete.
"fails" is used where it looks like the bug is in the product, so that we know
to re-enable the test with the product is fixed.
MozReview-Commit-ID: FenLhua7tm8
--HG--
extra : rebase_source : f93e5a67036174fcc20ef9209c731b311190f362