Merge "Expose FRONT_BUFFER usage flags" am: 96d426fbfb am: 87ca77083c

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

Change-Id: Id534b2d2d411784bb46f137dec7e2312041a599b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>