Merge "Signal dream end to overlay in finish()." into tm-qpr-dev am: b9446e1e am: dec1941f

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21131403



Change-Id: Ia470348e4fecce4ef4a6d59573c5f541f7e3cfaa
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>