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* OwningAudioManagerAccessor

* ServiceMain()

* Test fixture for out-of-process tests; used only for lifetime tests at this point.

* ServiceTest modification to allow custom test-specific manifests: we need that to
be able to have both in-process and out-of-process tests for the service. Done
following rockot@'s detailed instructions, see [1]

* kAudioServiceQuitTimeoutMs media switch to allow a non-default Audio service quit
timeout value (used in tests).

At this point we do not run Audio service out-of-process in Chrome: it's only an
basic infrastructure to enable testing various out-of-process functionality, such
as on crash behavior.

[1] https://www.google.com/url?hl=en&q=https://groups.google.com/a/chromium.org/d/msgid/services-dev/CAHri2_SHP26hm-a-295OCX5fMQZQqpopDxqLzi%252BpZXLzVnVN1w%2540mail.gmail.com?utm_medium%3Demail%26utm_source%3Dfooter&source=gmail&ust=1521721921151000&usg=AFQjCNH-pgZMrFjovDxxAE9ejd9v0eHHZg

Change-Id: I3af4760b1dedaa9211c135d5b11d33e78da772ac
Bug: 672469
Reviewed-on: https://chromium-review.googlesource.com/973861
Commit-Queue: Olga Sharonova <olka@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Max Morin <maxmorin@chromium.org>
Reviewed-by: Ken Rockot <rockot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#546477}