Fix A11y tools focus on blocked component 2/2

 - Add a callback to BottomActionBar, let the registrant receive BottomActionBar's state and disable the a11y param when expended
 video: https://drive.google.com/file/d/1T1w1bnAoQYvgpdSa7eYsFPOspjWV4hEP/view?usp=sharing

 Bug: 157871987
 Test: manually

Change-Id: I59666dde616c86d176d10bee0d1081358bb18959
3 files changed