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This is a reland of ac56b3e7

Original change's description:
> [CrOS PhoneHub] Add PhoneHubUiController.
>
> This class translates the PhoneHubManager state into the corresponding
> UI state and view that is shown in the tray bubble. Each state has
> it's own view class and the PhoneHubTray bubble transitions through
> these content views as the UI state changes.
>
> This CL also refactors PhoneConnectedView into it's own class.
>
> BUG=1106937,1126208
>
> Change-Id: Ie012077a1905f80be91fbfb0b084d89219bd6c26
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2427060
> Commit-Queue: Tim Song <tengs@chromium.org>
> Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#810942}

Bug: 1106937
Bug: 1126208
Change-Id: Idd71d6828f4a4bee3ecbbd5b598d57be3de2fadf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2436758
Commit-Queue: Tim Song <tengs@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811602}