InputDispatcher: Update tests to verify spy window gesture monitors

Before we enable spy window gesture monitors, we update the tests to
ensure that the behavior of a gesture monitor will not change when its
implementation is switched to a spy window.

Bug: 162194035
Test: atest inputflinger_tests
Change-Id: Id2130d782a04abbdcbf0cc412e53ad849ccb9275
3 files changed