GitLab

Added OzonePlatform::CreateScreen(), which returns in instance of the
new PlatformScren interface. Also added aura::SceenOzone that implements
display::Screen on top of PlatformScreen.

Bug: 850650
Change-Id: I3481dda921f564f0c117d9c8a0e8ce060254f4c3
Reviewed-on: https://chromium-review.googlesource.com/1162354
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Reviewed-by: Michael Spang <spang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582792}