The active window for accessibility purposes can be miscomputed.

1. The active window is the one that the user touches or the one
   that has input focus. We recognize the user touching a window
   by the received accessibility hover events and the user not
   touching the screen by a call from the touch explorer. It is
   possible that the user touches window that does not have
   input focus and as soon as he lifts finger the active one
   will become the window that has input focus but now we get
   he hover accessibility events from the touched window which
   incorrectly changes the active window to be the touched one.
   Note that at this point the user is not touching the screen.

bug:7298484

Change-Id: Ife035a798a6e68133f9220eeeabdfcd35a431b56