Test coordinates of ACTION_OUTSIDE events

The ACTION_OUTSIDE events have valid coordinates when the window
watching outside touches has the same owner as the first touched
window.

Add a test to document this behaviour.

Bug: 211379801
Test: m inputflinger_tests && $ANDROID_HOST_OUT/nativetest64/inputflinger_tests/inputflinger_tests
Change-Id: I701089ca39999ad8548ca8b83f11ac29f75a8cce