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It adds X11ScreenOzone for PlatformScreen which has basic
implementation.

When it creates PlatformScreen for Ozone/X11, X11ScreenOzone
is created and it creates X11DisplayFetcherOzone, which
communicates with 'x11::xrandr'. The way to get display
information in X11DisplayFetcherOzone is similar to
DesktopScreenX11. Once it builds display information from
'x11::xrandr', it adds the information to display list from
X11ScreenOzone.

This patch also moves 'GetICCProfileForMonitor' to x11_util.cc
to share it with X11ScreenOzone.

Bug: 891175
Test: ozone_x11_unittests
Change-Id: I2d901f72ca2d9609ef19eef7da35bf99aec62d2a
Reviewed-on: https://chromium-review.googlesource.com/c/1293290Reviewed-by: kylechar <kylechar@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>
Commit-Queue: Julie Jeongeun Kim <jkim@igalia.com>
Cr-Commit-Position: refs/heads/master@{#604826}