Merge "Showing starting window on freeform windowing mode." into sc-v2-dev am:...

Merge "Showing starting window on freeform windowing mode." into sc-v2-dev am: 244416ae am: 34c8bd2e

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15401452

Change-Id: Ifb4e503f625a0d5492948baa76ec2be82b05515b