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Rewrite android layout test device setup to not use ThreadPool.

This also moves device setup out of the driver, allowing us to set up
the devices without creating driver instances for the sole purpose of
doing so.

Bug: 784303
Change-Id: I948a3f9a2c6d69e76b42bbc7f1e239a3adb92206
Reviewed-on: https://chromium-review.googlesource.com/786778Reviewed-by: Quinten Yearsley <qyearsley@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521365}