Merge "Add listeners for the changes of App UIDs running on virtual displays....

Merge "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." into tm-qpr-dev am: e9192e1e

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/19785218



Change-Id: I5f15dea81dc138df2c0477a1e2333610ad16b262
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>