Give accessibility delegate the first pass at handling ACTION_CLICK

Delegation is broken for widgets, but this fixes the most egregious issue
where TextViews that are top-level list items weren't handling CLICK
actions correctly. This will still need work, since now the focus action
won't run, but it's an improvement.

BUG: 18736135
Change-Id: I808ef628198946cc87f13c53d6245cd162a1e517