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 am: 09e2a7f9

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



Change-Id: If97536e1b889be899966529215695e12750e2c57
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>