I'd like to test other things (like tap makes the IME move), but to do
that means replacing the mock with a proper fake. That can come later,
but this at least tests that the flagging works correctly.
The changes between this and
commit cae34b8e22 is the bouncer height is
now measured using wrap_content, so the placement can be controlled
properly by the outer View (as the position of the bouncer changes
depending on the size of the screen).
This reverts commit cae34b8e22.
Test: Included
Bug: 170858298
Change-Id: I18428a6df9abf0e8e37c1c179be6843e4eee793c
868e770b82