Return empty scan results for background user

package com.android.server;

import android.app.ActivityManager;

import android.app.AlarmManager;

import android.app.Notification;

import android.app.NotificationManager;

import android.os.RemoteException;

import android.os.ServiceManager;

import android.os.SystemProperties;

import android.os.UserHandle;

import android.os.WorkSource;

import android.provider.Settings;

import android.text.TextUtils;

     */

    public List<ScanResult> getScanResults() {

        enforceAccessPermission();

        if (UserHandle.getCallingUserId() != ActivityManager.getCurrentUser()) {

            return new ArrayList<ScanResult>();

        } else {

            return mWifiStateMachine.syncGetScanResultsList();

        }

    }

    /**

     * Tell the supplicant to persist the current list of configured networks.