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Used to indicate high confidence/low confident text distinctly.
Screenshot in bug.

Bug: b:78644149
Change-Id: If5b1a19481b124c414b27d310c5a60832d0e4fd6
Reviewed-on: https://chromium-review.googlesource.com/1030978
Commit-Queue: David Black <dmblack@google.com>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554812}