Merge "Execute app transition if starting window is drawn" into sc-dev am: e8db0791 am: 8438fdc0

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

Change-Id: I61f1c8dcab5f9b1b6e6e4a432e9dc2eb9b79f507