Merge "Resolve 3 inconsistencies in accessibility button API - Unify logic for detecting availability of the accessibility button - Ensure the initial visibility state is propagated to A11yMS - Ensure services only receive availability callbacks for changes" into oc-dev am: 4ab690a50d
am: 8097485c28

Change-Id: I0c21a256e612fd2ecfb2dce6c4d28e3c33e075e2