Merge "Allow per-app opt in to use system ANGLE." into udc-qpr-dev am: 5d2d19c538 am: 3b59ccfd6b

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/23768276

Change-Id: I734774b0adab3a317a8a3e0e17e74c7536d04025
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>