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This CL lands the service-side implementation of the mojom::VEA
and unit tests for it. It doesn't connect it yet, but the 
final result can be found in https://crrev.com/c/558846.

Bug: 736517
Change-Id: I6d77da653cfa8e4db9b2691707302fa2ad2d4479
Reviewed-on: https://chromium-review.googlesource.com/566262
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Reviewed-by: Emircan Uysaler <emircan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487022}