Merge "Execute app transition if starting window is drawn" into sc-dev am:...

Merge "Execute app transition if starting window is drawn" into sc-dev am: e8db0791 am: f799c098 am: e13f577a

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14934413

Change-Id: I8ecde893df137abbdeb712b4824469ce39250cc1