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This is a reland of edb91802

Original change's description:
> Add an interface to communicate between the fake openvr and tests
> 
> This change creates a way for tests to control the behavior of
> the fake OpenVR, and allows devices to send information up to
> tests.
> 
> BUG=801034
> 
> Change-Id: Ie0fe035ada9553114c054717f52788d375d5c62f
> Reviewed-on: https://chromium-review.googlesource.com/1100157
> Commit-Queue: Bill Orr <billorr@chromium.org>
> Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#567725}

Bug: 801034
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:linux_vr;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: Ic4c1b4891df8ba1de9d7bf07863d4b696ec81de0
Reviewed-on: https://chromium-review.googlesource.com/1104761
Commit-Queue: Bill Orr <billorr@chromium.org>
Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568201}