Merge "Make client callbacks consurrent modification safe" into main

import com.android.internal.annotations.VisibleForTesting;

import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;

import java.util.concurrent.ConcurrentLinkedQueue;

/**

 * Allows clients (such as keyguard) to register for notifications on when biometric lockout

    private final Context mContext;

    @VisibleForTesting

    final List<ClientCallback> mClientCallbacks = new ArrayList<>();

    final ConcurrentLinkedQueue<ClientCallback> mClientCallbacks = new ConcurrentLinkedQueue<>();

    private static class ClientCallback {

        private static final long WAKELOCK_TIMEOUT_MS = 2000;