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Runtimes should only be handled by the XRRuntimeManager. Moving the
logic which handles getting current display info as well as checking for
session supports out of XRDeviceImpl is a step in that direction.

Bug: 842025
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: I95bd331a30c91deb665aa12853f8a80d79c0e51b
Reviewed-on: https://chromium-review.googlesource.com/1181535Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Commit-Queue: Anna Offenwanger <offenwanger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584550}