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This change also adds a new target for performance tests in VR
and a target for dependencies shared among vr test targets.

Bug: 772551, 774636
Change-Id: I7de0cd8a5fcba3e71358625c1f3ebfb9bab49fba
Reviewed-on: https://chromium-review.googlesource.com/703690
Commit-Queue: Tibor Goldschwendt <tiborg@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Ian Vollick <vollick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#509419}