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Define the bridge interface to connect the machine USB devices to the
Android USB host API.
Implement the API using /device/usb.

The permission request for the USB devices is currently stubbed and
fails closed. So until the Permission UI and settings are submitted, the
API basically rejects all the requests.

Bug: 24572867
Test: Manual, run with ARC++ app using android.hardware.usb to use USB
devices.

Change-Id: Ibce0a45e4359a97ee06d8d49981169bd5f18176f
Reviewed-on: https://chromium-review.googlesource.com/731284Reviewed-by: Mattias Nissler <mnissler@chromium.org>
Reviewed-by: Luis Hector Chavez <lhchavez@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Vincent Palatin <vpalatin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523790}