Merge "Add RandomGeneratorFactory test coverage." into main am: 790a6497c1 am: a80808733e

Original change: https://android-review.googlesource.com/c/platform/libcore/+/2977931

Change-Id: Ib17ac67dfa91193b4d7a5ba3b4d7a7fb10e90479
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>