Merge "Expose FRONT_BUFFER usage flags" am: 96d426fbfb

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/2393619

Change-Id: I918867ec8c679777c24fcd4a9bbaa242ab159b44
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>