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This CL moves all files in ui/display/manager/chromeos to
ui/display/manager and adds build_display_configuration GN arg
so that the display configurator could be used in Linux
desktop.

BUG=733450

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
Change-Id: Idd790cfe6f9e5daf6ccad23353573028ebe5d7ee
Reviewed-on: https://chromium-review.googlesource.com/969416Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: kylechar <kylechar@chromium.org>
Reviewed-by: Malay Keshav <malaykeshav@chromium.org>
Commit-Queue: Joone Hur <joone.hur@intel.com>
Cr-Commit-Position: refs/heads/master@{#551390}