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 am: c0acfac5

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



Change-Id: I74affdc1ad7686cb771b50066a9c8c0201878549
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>