Merge "Add listeners for the creation and destruction of virtual displays....

Merge "Add listeners for the creation and destruction of virtual displays. This will be used later by VibrationSettings to keep record of active virtual displays." into tm-qpr-dev am: 81b40bae

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/19477752



Change-Id: I66fa50d09760d2308315ea27f35b37812d07ec02
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>