76c0dd4827
1. The active window for accessibility purposes is the either the window the user is touching or the window that has input focus. We were using the touch exploration gesture end event to figure when the user stops touching the screen so we can set the active window to the input focused one. However, we do not send such gesture end if the user does not touch explore. If the user only taps we do not consider this touch exploring. We now have dedicated accessibility events for first and last touch and this change uses them as a guide when to update the active window. bug:6523219 Change-Id: I6262c0c5f408b02dbaa127664e4b426935d7f81f