This should prevent states where Assistant triggers from
the vertical-center of the screen in portrait (see bug).
Also fleshes out OrientationTouchTransformerTests and
adds some new ones that fail without this change:
- enableMultipleRegions_assistantTriggersInMostRecent
- enableMultipleRegions_assistantTriggersInCurrentOrientationAfterDisable
Fixes: 158686674
Change-Id: I6d045a485f62e4010e9e3d00805a50fdd953a2fc
(cherry picked from commit 4b531b972d)
Andy Wickham
d2731957ea