Merge "Add windowing_frontend flags to window flags" into main am: 5effed6cda am: 64d057e1d2 am: 06c5bddba1

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2750643

Change-Id: I0d65a9e83ea806139e2f2e5a75420a0931991200
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>