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The implementation is based on UX design [1].

[1] https://docs.google.com/presentation/d/1MWWejK-y2vnBN3Wg__Kd_LIiAcIF3VctzMowMI3wM4w/edit#slide=id.g91c6bdd2e4_0_12

Bug: b/167491603
Change-Id: Id107ea7b4b90aad0714a617147acc877adb9fc1d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2397979
Commit-Queue: Jason Lin <lxj@google.com>
Reviewed-by: Tim Song <tengs@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814566}