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When this feature is enabled, and the user has never changed the
schedule on the device, NL is set automatically to follow a
sunset-to-sunrise schedule.
We also show a notification when NL changes status because of Auto
Night Light. This notification is never shown again once the user
interacts with it (by closing it, or clicking on it).

This feature is not exposed to the end user, and only enabled by
the session manager on some devices based on their cros-config.

BUG=1026871
TEST=ash_unittests --gtest_filter=*AutoNightLight*

Change-Id: Ia15cd94d7c6a4c5fa30413f526282f713b9ba395
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1927987
Commit-Queue: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719304}