[Cherry-pick] Add debug property to safe guard ANGLE developer option UI. am: 3182b0e298

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

Change-Id: If12eaf605c7e85da20bbcd48ccf3f855e744091d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>