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Add overlay strategies single-fullscreen and single-on-top
when the primary DRM device has atomic capabilities.

Bug: 834015
Test: checked on kevin HW overlays are used.
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_layout_tests_layout_ng;master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: I06ac101311384baeb49eb31f5fab0d2550fb332e
Reviewed-on: https://chromium-review.googlesource.com/1022872Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Reviewed-by: Kristian H. Kristensen <hoegsberg@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Daniele Castagna <dcastagna@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554849}