Merge "Update DreamManagerService to be aware of user switching." into udc-qpr-dev am: fcb72565

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23523729



Change-Id: I964d32b9a4aa381855479c0106a931e1e9849fe6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>