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Adds automated versions of VR manual tests involving Incognito tabs.

Bug: 861925
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: I197b2940755ec92d648c35fb77a1f213e2b402f5
Reviewed-on: https://chromium-review.googlesource.com/1134508Reviewed-by: Amirhossein Simjour <asimjour@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578335}