Merge "Revert "Introduce Windowless starting window."" into udc-dev am: f515de95 am: 54d0eb08

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21590159



Change-Id: Ib7aaaac5f36e8de47df6e3e14f2ea5f799584338
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>