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This patch implements a simple functional UI in ambient mode
for further testing and investigation.

Bug: b/139698911
Test: manually.
Change-Id: Iaac9af294afe4d47cd3a7138f56fb2e8c668a634
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1850585
Commit-Queue: Meilin Wang <meilinw@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Reviewed-by: Tao Wu <wutao@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708363}