[automerger skipped] [Cherry-pick] Add debug property to safe guard ANGLE...

[automerger skipped] [Cherry-pick] Add debug property to safe guard ANGLE developer option UI. am: 3182b0e2 am: a62d0146 -s ours am: f3f3179e -s ours

am skip reason: Merged-In Ife31f4b0426f3ce107f86cfbaf3f1aeca567e250 with SHA-1 77437853 is already in history

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



Change-Id: If864f4a55b05fa0c6e2fed3770900df67df1c937
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>