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This is a reland of a3015a89

Original change's description:
> Add AR instrumentation test support
>
> Adds the necessary changes to build and run
> AR (augmented reality) tests in Monochrome.
>
> Does not actually enable the test APK to be
> built or run anywhere - that will be added
> at a later time once additional work to
> properly run the tests on bots is done, e.g.
> installing the ArCore APK.
>
> Bug: 851020
> Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_layout_tests_slimming_paint_v2;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;master.tryserver.blink:linux_trusty_blink_rel
> Change-Id: I4148fcc6626ef79852f78f6019cc7c6f297f3e37
> Reviewed-on: https://chromium-review.googlesource.com/1101958
> Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
> Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
> Reviewed-by: Brandon Jones <bajones@chromium.org>
> Reviewed-by: agrieve <agrieve@chromium.org>
> Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#573599}

TBR=yfriedman@chromium.org,mthiesse@chromium.org,bajones@chromium.org,agrieve@chromium.org

Bug: 851020
Change-Id: If8410366848ff25d276cb2473f773c153a32f94f
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_layout_tests_slimming_paint_v2;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;master.tryserver.blink:linux_trusty_blink_rel
Reviewed-on: https://chromium-review.googlesource.com/1131715Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#573899}