[autotest] Add a high-level descirption to logging_manager.

BUG=None
TEST=None

Change-Id: I87e92289f6d0ab178b24ea5c6cd75d62693e82a6
Reviewed-on: https://chromium-review.googlesource.com/220173
Reviewed-by: Alex Miller <milleral@chromium.org>
Commit-Queue: Alex Miller <milleral@chromium.org>
Tested-by: Alex Miller <milleral@chromium.org>
1 file changed