@SuppressWarnings("MissingOverride") // For Android backward-compatibility.
    public final String[] getPeerSupportedSignatureAlgorithms() {
        return PEER_SUPPORTED_SIGNATURE_ALGORITHMS.clone();
    }
This is an adapter that wraps the active session with {@link ExtendedSSLSession}, if running
on Java 7+.
common/src/main/java/org/conscrypt/Java7ExtendedSSLSession.java