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Add content description to handle in bubble
When a bubble is expanded from bubble bar, it will have the app handle. Add content description to the handle so users using talkback know what it is. Update content description of the handle from "handle" to "app handle" based on UX feedback. Bug: 344671270 Flag: com.android.wm.shell.enable_bubble_bar Test: enable talkback and focus on bubble handle Change-Id: I22d15b4fcdea4549e9a8b1589ad0d584d4e23af1