Using parent windowId instead

AccessibilityWindowManager would get null interactive region since
embedded hierarchy doesn't have window. Because interactive region
is null, A11yInteractionController#adjustIsVisibleToUserIfNeeded
wouldn't adjust its visibility to false. This results in that the
visibility of A11yNodeInfo on embedded hierarchy may be incorrect.

Bug: 151203875
Test: a11y CTS & unit tests
Change-Id: I7d61a15994bf726e708e597d0363904fdb32f183