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This adds a perftest which moves the reticle around and measures the
UI costs.

Bug: None
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_vr;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I688ad47adb6e3ba4f6cf5fd19410d348ba154e30
Reviewed-on: https://chromium-review.googlesource.com/993760
Commit-Queue: Ian Vollick <vollick@chromium.org>
Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548068}