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This change switches SimpleOverlayRenderer to use command buffer instead of
native D3D11 to render overlays.

Note that SimpleOverlayRenderer is still not enabled by default - only used for
dev testing with code changes to enable it.

BUG=819448

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: I4833f5773a838326457c56890bd177f3ad7a5ad5
Reviewed-on: https://chromium-review.googlesource.com/c/1259424
Commit-Queue: Bill Orr <billorr@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Klaus Weidner <klausw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#598432}