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Please see demo screenshot in the linked bug.

Bug: b/161481969
Test: covered by unittests.
Change-Id: I8e3d867220ff7e23e79ac807ce6929fd04a246ca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2342784
Commit-Queue: Meilin Wang <meilinw@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796884}