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Updates the VR UI model to allow an array of controllers, each of which
will be rendered as part of the UI. This update introduces a concept of
a "primary controller" (largely for porting convenience) that is
currently always the controller at index 0 of the array. We may want to
improve the logic around that in future CLs.

Bug: 873274
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: I1a91f6550f4d051d35d872118c822f1b6716c614
Reviewed-on: https://chromium-review.googlesource.com/c/1171519
Commit-Queue: Brandon Jones <bajones@chromium.org>
Reviewed-by: Christopher Grant <cjgrant@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612778}