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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}