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This is a reland of 2e1031ec

Original change's description:
> [CrOS PhoneHub] Add enable hotspot and locate phone controller to quick
> actions UI.
>
> - Add enable hotspot and locate phone quick actions controllers.
> - Connect the controllers to quick actions UI.
> - Minor changes in fake tether controller for testing.
>
> BUG=1106937,1126208
>
> Change-Id: I1d4ace03120a4c51fcb351b7c19f33252b3fb81c
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2428735
> Commit-Queue: Andre Le <leandre@chromium.org>
> Reviewed-by: Tim Song <tengs@chromium.org>
> Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#812915}

Bug: 1106937
Bug: 1126208
Change-Id: Ica4cafc1d2dac4d0c579fcbead6a7b771e35b87c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2445835
Commit-Queue: Andre Le <leandre@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813287}