Makes TYPE_ACCESSIBILITY_MAGNIFICATION_OVERLAY as trusted overlay

A MotionEvent dispatched within the area of trusted overlay
would not referred as an obscured event even a trusted overlay
overlaps other windows.
If a MotionEvent is referred as obscured when clicking accessibility
settings dialog, it would stop users from switching on an accessibility
settings and show a warning toast.
This change could make magnification window as trusted overlay that
users able to switch on an accessibility setting by touching inside
the area of the magnification window.

Bug: 144075853
Test: Verified an a11y settings is abled to be switched on when
the MotionEevent is dispatched within the magnification overlay.

Change-Id: I83a6ce1f6e66c55c45746e5a16d0d988d1c1ae0b
diff --git a/include/input/InputWindow.h b/include/input/InputWindow.h
index c44db51..aa85e6d 100644
--- a/include/input/InputWindow.h
+++ b/include/input/InputWindow.h
@@ -107,6 +107,7 @@
         TYPE_MAGNIFICATION_OVERLAY = FIRST_SYSTEM_WINDOW+27,
         TYPE_ACCESSIBILITY_OVERLAY = FIRST_SYSTEM_WINDOW+32,
         TYPE_DOCK_DIVIDER = FIRST_SYSTEM_WINDOW+34,
+        TYPE_ACCESSIBILITY_MAGNIFICATION_OVERLAY = FIRST_SYSTEM_WINDOW+39,
         LAST_SYSTEM_WINDOW      = 2999,
     };