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Adds the Night Light automatic schedule settings.

Demo: https://bugs.chromium.org/p/chromium/issues/detail?id=705816#c15

BUG=705816
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2915753003
Cr-Commit-Position: refs/heads/master@{#478767}