Merge "Create splash screen if activity launched with FLAG_ACTIVITY_CLEAR_TASK" into sc-dev am: 3abf2a7c am: 9a4bc41e

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14963616

Change-Id: Icec4309bd4264b5c423b77b5694ad7dedad80df7