Cannot double tap and hold outside of the input focused window.

1. The long press routine was using the coordintates of the
   accessibility focused item in the input focused window.
   As a result double tap and hold did not work in a window
   that does not take input focus such as the system bar.
   Now the routine is using the last touch explored location
   if it cannot find accessibility focus in the last touched
   window.

bug:6584438

Change-Id: Ifd43adb20a066f389a9d4bd5716dd7ad834dd574