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This is a reland of d80f755b

TBR=antrim@chromium.org
TBR=alemate@chromium.org

Original change's description:
> DeviceStateMixin: Update local state and support for setting policy
>
> Taking over rsorokin's patch at CL:1578742, given that he is OOO.
>
> DeviceStateMixin now initialized device state values in local
> state during setup.
>
> Add support for setting device policy and device local account policies
> in in-memory fake session manager client, in a way similar to
> UserPolicyMixin. Later this functionality can be moved to a separate
> mixin, which might make sense if/when we add functionality for setting
> up policy served by local test policy server to this mixin (this should
> already be possible using LocalPolicyTestServerMixin).
>
> Uses AutoLaunchedKioskTest as an example of new usage.
>
> Also fixes a number of tests to wirk with the new device state setup.
>
> Bug: 952855
> Change-Id: I1c0314a51581137d0f5a0907a09a4ef5b0bccda3
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1600857
> Reviewed-by: Denis Kuznetsov <antrim@chromium.org>
> Reviewed-by: Alexander Alekseev <alemate@chromium.org>
> Commit-Queue: Toni Baržić <tbarzic@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#658297}

Bug: 952855
Change-Id: I966406b55aaffe78137be296a31b4b42202fe8cd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1604186Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Reviewed-by: Denis Kuznetsov <antrim@chromium.org>
Commit-Queue: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#658808}