Merge "Provide a way to keep dreaming when undocking." into tm-qpr-dev am: e9adc317

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/19607670



Change-Id: I52efcbdda2517ef6d601741e51b1b55558e986d9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>