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If GVR reports a floor offset from the current tracking origin the floor
grid will be adjusted to render at the same offset. This should help
user comfort when using standalone devices.

Bug: 845225
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;luci.chromium.try:win_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_vr
Change-Id: I08bd081087f4f6528ec8200ee424d08f9bf9f059
Reviewed-on: https://chromium-review.googlesource.com/1067541
Commit-Queue: Brandon Jones <bajones@chromium.org>
Reviewed-by: Christopher Grant <cjgrant@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561690}