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Add API in ash_message_center_controller.mojom to support
DO_NOT_DISTURB setting modification when query comes.

Test: local compile and manually test.
Change-Id: I645cff4aace79038ff8a7a39a498464cfced9979
Reviewed-on: https://chromium-review.googlesource.com/c/1260504Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Commit-Queue: Meilin Wang <meilinw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#597363}