Update Window Extensions library APIs

Bug: 257937650
Bug: 259218261
fixes: 264025195
Test: manual - using sample app
Test: manual - update prebuilt library and verify in Settings app

Merged-In: Ife8dc02d6f62676c8f06558700afd8b2f75f01c6
Change-Id: Ife8dc02d6f62676c8f06558700afd8b2f75f01c6
9 files changed