GitLab

Add unit tests for probe service.

Bug: b:158658869
Change-Id: I3feff23e437d1883b7f4be9c9dcb97910f3ad85d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2248185
Commit-Queue: Oleh Lamzin <lamzin@google.com>
Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781797}