Merge "Set dream overlay window title to System UI." into tm-qpr-dev am: 31773d21 am: e0eaadb0

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21550079



Change-Id: I8bce34eb9b4913f4118ed0604588f287c5d2a433
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>