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This will allow us to complete the driver upgrade. It does not use
the optional swarming mixin feature. A prior attempt to use the
optional mixin failed due to a bug. After the upgrade is complete
we will need to quickly remove the alternate swarming dimensions.

Bug: 887241
Change-Id: Ib2bdbe3587a61597287285047c7dfdd7f19fdad1
Reviewed-on: https://chromium-review.googlesource.com/c/1447841Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Cr-Commit-Position: refs/heads/master@{#628022}