Add Talkback navigation for BABar bottom sheet

Video: https://drive.google.com/file/d/1Cahc2oh-RjL1MNSY6eWBh5hoDnp1jigR/view?usp=sharing

Test: Manually
Bug: 156985852
Change-Id: I562129021186cbe19a048e6c549c8796d2f59bce
2 files changed