Merge "Nest SystemUI alert dialogs in NestedScrollLayout" into tm-dev am: ea91f5bb91

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17756832

Change-Id: I292c50a0bad2eb5fe5b9ed3e649f58ba27294e04
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>