Fix potential loophole where ime adjust notification is not sent

- If IME adjust is cleared due to minimizing status change, make
  do a performSurfacePlacement to get UPDATE_DOCKED_STACK_DIVIDER

- If IME adjust status is changed while waiting for drawn for the
  resizing mode, only report the latest status not the stale status

- Add some verbose log to help debugging

bug: 29313747
Change-Id: I0c561d2ad294dba1a966ffa7205f1315b599a4bb