[automerger skipped] [Cherry-pick] Add debug property to safe guard ANGLE developer option UI. am: 3182b0e298 am: e92284ced1 -s ours am: 574928e691 -s ours

am skip reason: Merged-In Ife31f4b0426f3ce107f86cfbaf3f1aeca567e250 with SHA-1 774378530f is already in history

Original change: https://android-review.googlesource.com/c/platform/packages/apps/Settings/+/2794055

Change-Id: I48eda37e1c530025aae5daf5c0bce05737be120b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>