Disable gesture detector on mini-keyboard (DO NOT MERGE)

This is cherry-pick I548501f7 from Honeycomb.

Gesture detector, for closing keyboard by swiping down, must be
disabled not only when mini-keyboard is on the screen, but also in the
mini-keyboard itself.

Bug: 3105595
Change-Id: Ic4603637208794a1bf6cfeb0d22dadd9a1e49e81