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

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

Change-Id: I51a525130ae058b43169c871d1583eba5e9c6cf4