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Add pause/resume on focus changes in ARCoreDevice to correctly
pause/resume ARCore.

Bug: 838513, 837550

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: I40f11c48c6a9f15b3a558546e017545f0ab66a1d
Reviewed-on: https://chromium-review.googlesource.com/1046112Reviewed-by: David Dorwin <ddorwin@chromium.org>
Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Reviewed-by: Klaus Weidner <klausw@chromium.org>
Reviewed-by: Bill Orr <billorr@chromium.org>
Commit-Queue: Iker Jamardo <ijamardo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#563168}