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This adds a small D-Bus service framework to ash and then adds an
initial service that has one call "OpenUrl" which will then
open a new tab in Chrome with that URL. This is intended to be used by
Chrome OS clients that want to open a URL with Chrome; initial usage
will be from VMs.

Relanding crrev.com/c/998081, fixed missing D-Bus .conf file
TBR=stevenjb@chromium.org,dominickn@chromium.org,hashimoto@chromium.org,mkwst@chromium.org

Bug: 822496
Bug: 831333
Test: Verified with dbus-send that links open properly
Change-Id: I5e6d9c716ef6da88b184e8e05582825d9547946e
Reviewed-on: https://chromium-review.googlesource.com/1014424
Commit-Queue: Jeffrey Kardatzke <jkardatzke@google.com>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551383}