Fix controlWindowInsets for IME

If IME is already visible, requestShow() is immediate.
If animation is finishing and IME is hiding, notify IME process of the
visibility.

Bug: 111084606
Test: Use test app [1] and verify that swiping up and down multiple
      times opens and closes the IME respectively.

      [1] I4320871bdc8184fac38921616e1a1322f8dbc804

Change-Id: Icf202b56c0bc3833e86ee70c43fedd418e27b140