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When an automatic schedule is being used, users can toggle the status
of Night Light manually from the system tray or the system settings.

This manual setting used to get reverted, and the schedule used to get
reapplied in the following cases:
- Switching users.
- Resume from suspend.
- Receiving a new geoposition.

This CL makes it possible to remember manual toggles, and reapply
them if possible.

BUG=999397
TEST=Manually, added new tests.

Change-Id: Idb1b76cf24c95e0833a65542f0b0ffa341195c3e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2049950
Commit-Queue: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#741569}