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ARC MIDI uses this to connect to the midis daemon running in
Chrome OS. It takes a Mojo connection request over the ArcBridge,
and then uses D-Bus (for sending across a message handle) to initiate
a Mojo connection with that daemon. The daemon then returns a 2nd Mojo
interface (with the actual Midis client calls) back to the proxy,
which in turn sends it to the Android side. At present, the Connect()
call which should return the 2nd Mojo interface handle has not yet
been implemented.

It retains the initial Mojo connection with the daemon is maintained,
for future ARC sessions, and tears down when the daemon dies.

This implementation is a based on the similar implementation used by
ArcOemCrypto.

BUG=chromium:701005

Change-Id: Icc8c937f743ddcc3deca85446c303408b17ec759
Reviewed-on: https://chromium-review.googlesource.com/638913
Commit-Queue: Prashant Malani <pmalani@google.com>
Reviewed-by: Greg Kerr <kerrnel@chromium.org>
Reviewed-by: Luis Hector Chavez <lhchavez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#501170}