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This is a reland of 3792c739

Reason for reland: This is safe to reland as the original revert was
due a merge conflict with crrev/2428735 which has been reverted. This
reland will land first.

Original change's description:
> Add additional states to FindMyDeviceController
>
> Fully implements the FindMyDeviceControllerImpl class. This change
> also features a new state: kRingingNotAvailable.
> This state is only set if the DoNotDisturb is enabled.
>
> Bug: 1106937
> Test: chromeos_components_unittests
> Change-Id: Ifeb4dd88ea19ad6949bad2a92d840f392d7ccd47
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2438773
> Commit-Queue: Jimmy Gong <jimmyxgong@chromium.org>
> Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#812962}

Bug: 1106937
Change-Id: Id8400f68f1980dc8288d7c1b2545810721844249
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2444410
Commit-Queue: Jimmy Gong <jimmyxgong@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813053}