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This is a reland of e77cef6b

No changes, submit after the internal code submitted.

TBR=xiaohuic@chromium.org,xiyuan@chromium.org

Original change's description:
> ambient: Add Get/Update Settings APIs
>
> This patch adds the Get/Update Settings APIs so that we can show and
> update it in the Chrome OS Settings ambient mode page, which will be
> implemented in a follow up cl.
>
> Bug: b/148483925
> Test: manual
> Change-Id: Ia74d875813860a6abbfdc01479a67fed0c029fb8
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2125685
> Commit-Queue: Tao Wu <wutao@chromium.org>
> Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
> Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#755531}

Bug: b/148483925
Change-Id: I40f57d6e2cfe267a2ff27513e3702273e87d9434
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2135417Reviewed-by: Tao Wu <wutao@chromium.org>
Commit-Queue: Tao Wu <wutao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756159}