Enable desktopui_PyAutoEnduranceTests in the autotest lab and on the results dashboard.

BUG=chromium-os:21881
TEST=None

Change-Id: I199b296eba9774696be1a1aa248bf863b201627a
Reviewed-on: https://gerrit.chromium.org/gerrit/25155
Reviewed-by: Scott Zawalski <scottz@chromium.org>
Commit-Ready: Dennis Jeffrey <dennisjeffrey@chromium.org>
Tested-by: Dennis Jeffrey <dennisjeffrey@chromium.org>
3 files changed