Add listeners for the changes of App UIDs running on virtual displays.
This will be used later by VibrationSettings to keep record of apps
currently on virtual displays.

Test: VirtualDeviceManagerServiceTest

bug: 189474679
Change-Id: I120f8f8a1d3d0d8c72bf3ff42a6661147e474ccb
(cherry picked from commit 0880191a03477eebf9cf78850bca00fe6def5514)
3 files changed