Merge "Implement the legacy splash screen behavior" into sc-dev am: 2be72d03 am: 97b93c7d am: e6d3219a

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14920934

Change-Id: I9b1c20c1641cbfa6007deafaea075dd25616c7cc