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Callback custom PiP action as Button
For Accessibility, callback the custom PiP actions provided by app as "Button", instead of asking each app to set so. This aligns with other system provided actions, such as Expand, Settings and Close. Flag: EXEMPT bugfix Bug: 373840926 Test: Manually check TalkBack Change-Id: Id577f88a436cf7579545843918600eaaf4e7007f