Close windows on ACTION_UP when touched outside

If a window is touched inside the touchable region, but outside of the
physical frame, the setting closeOnTouchOutside=True for this window
would mean that the window would close.

Currently, the window would close when ACTION_DOWN on the touchable
region happens.
However, with the new gesture nav, the KEYCODE_BACK would also be
injected. Normally, the KEYCODE_BACK would also close the window. But if
the window is already closed in response to ACTION_DOWN, the
KEYCODE_BACK event would cause the underlying window to close.

This could be confusing to the user, because in this case a single
action (swiping back outside of the dialog) causes 2 actions to occur:
the dismissal of the window, and the navigation back to the previous
screen of the underlying window.

To avoid this poor user experience, we instead dismiss the window when
ACTION_UP inside the touchable area happens.

UX impact:
This CL would not change the user experience for tapping to dismiss the
dialogs, because tap has a short duration between down and up (most
common usecase).
This CL would now allow the user to maintain the finger on the screen
outside of the dialog for an arbitrary amount of time, without the
dialog disappearing. When the finger is lifted, the dialog would be
dismissed.
This CL improves the user experience for gesturing back to dismiss the
dialog, because the dialog most of the time will dismiss and nothing
else will happen. However, there still exists opportunity to cause the
old behaviour. The window can receive ACTION_UP before KEYCODE_BACK is
injected by gesture nav.

Important! If BACK is received by the app after ACTION_UP is received
(can happen occasionally), then the we would still see 2 actions happen
in response to a single swipe. This issue is tracked in b/132735993, but
it is likely that it will remain in Q.

Bug: 131410670
Test: open any dialog (for example, go to settings->display->screen
timeout), then press outside of the dialog and hold. Watch that the
window is not dismissed. Then release finger. Watch that the dialog
dismisses.
Also, gesture back outside of the dialog area. Watch that the dialog
disappears and nothing else happens (but see the important note above
for exceptions to this).

Change-Id: I2e7c1bab986f019dc2f4640ff9f4151ebb96479c