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This change is to support the Switch Access focus ring style described
in this spec: https://gallery.googleplex.com/projects/MCHbtQVoQ2HCZQBEKUk1sS_U/files/MCHtA7U1iMGr6-mR9r6ArPGAjSutDL__KP4

Bug: 925103
Change-Id: I6aeda730fd8717282cb49867840010aea7a92f83
Reviewed-on: https://chromium-review.googlesource.com/c/1435435
Commit-Queue: Anastasia Helfinstein <anastasi@google.com>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#626224}