Add ui_SystemTray test into bvt-perbuild test.

Test is ready to be onboarded into bvt-perbuild. That will also give us
more test results.

BUG=None.
TEST=None.

Change-Id: I40b6f12ed8784f02f760634080ce1362f56f9ff0
Reviewed-on: https://chromium-review.googlesource.com/222712
Reviewed-by: Tracy Turchetto <tturchetto@chromium.org>
Tested-by: Mussa Kiroga <mussa@chromium.org>
Commit-Queue: Mussa Kiroga <mussa@chromium.org>
1 file changed