base

Fix black flicker when closing IME

When closing the IME in docked adjusted mode, we still need to pass
in the IME window so we can still execute the logic to delay starting
the animation, so we don't see a black hole before the animation is
started.

Bug: 28175599
Change-Id: I606d30bd63b5e909fdebd78b0aa4968bd9f26c24