Merge "Make user switching dialog cover top part of the screen as well." into udc-dev am: 72e4b7e0 am: b647b707

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



Change-Id: Ie8c17efa7a1f1598c4de609b5e2b6a521ba9281f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>