Merge "Make user switching dialog cover top part of the screen as well." into udc-dev am: 72e4b7e0 am: c919a7e4 am: 229b019e am: 4f43ce57

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23639284



Change-Id: Icd85f792e0ac453f3e35069f97021550b211b32e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>