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This CL is splitted from the original CL:
https://chromium-review.googlesource.com/c/chromium/src/+/2199870
with all files changed on ambient/. side.

Bug: b/156531168
Test: unittests.
Change-Id: I4f84277c74c95419ac96e6cfaaa48081c407b243
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2248878
Commit-Queue: Meilin Wang <meilinw@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779664}