Added visibility needed for the S snapshot am: 1b00dad50e am: 73b8bf0344

Original change: https://googleplex-android-review.googlesource.com/c/platform/libcore/+/19321575

Change-Id: Ic177ad4d038daac1b09b79b5acc83e076454e426
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>