Merge "Handle invalid dream window in DreamOverlayService." into tm-qpr-dev am: 85243f02

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21538455



Change-Id: Id75528773627ef0e6fa8349b1b71478f5066b4e5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>