Add new policy flag to notify if a key gesture was triggred

Policy needs to be passed a key event even if the key event was
used in a gesture (to maintain state). So use this flag to inform
policy that a key gesture was done using the KeyEvent

Test: None
Bug: 358569822
Flag: EXEMPT refactor
Change-Id: I431377df09080ae42d467b610d234b0f7734e025