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Since BadgeState is a mask, a direct equality comparison to
BadgeState values for the BadgeItem properties is not the correct
way to assess if a badge is accepted.

To add testing support for this case, accepted a11y identifiers
for BadgeButtons are created, and they will be properly set
in setAccepted: in BadgeButton.

This change is a relanding of crrev.com/c/1872938, which failed because
iPhone SE's screen was not wide enough to contain all the view in Showcase.
Changes were made in sc_badge_coordinator to create two rows instead of
one.

Bug: 976901, 1016793
Change-Id: Iadc7e3e42529ded0aa331da3845e8644e4cac9c2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1881364
Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
Reviewed-by: Peter Lee <pkl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709675}