Add a WM API to query the touch region for the input method window

This is needed by VR to handle keyboards that display a window larger
than the interactable region

Bug: 62194867
Test: Manually with prints
Change-Id: I7288956ed8da8d24e7c46ffa8f27461f7abbca5e
(cherry picked from commit 56162a0a51e2aa752a500d941869f1af652eabbf)
2 files changed