Expose runtime_probe DBus client via DBusThreadManager

Also make fake client implementation provide reasonable values.

Bug: 916991
Change-Id: I85c35f27f80bfd7179ad47db8e9ef14ac4f1f8c9
Reviewed-on: https://chromium-review.googlesource.com/c/1400839
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Denis Kuznetsov <antrim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#621552}
4 files changed