Ensure accessibility focus rect is drawn correctly

Reverts previous change that draws it as part of View.draw() and ensures
that the display is always redrawn if a view has accessibility focus.
Correctly removes focus from views with accessibility focused ancestors.

Also reverts the focus indicator to use a solid line since the dotted
line looked janky.

BUG: 17675993
Change-Id: I25718334cc1ae1c2cd19d3c23af1c18c6a67504c