Add documentation to recently added system API

    private static volatile boolean sForceSafeLabels = false;

    /** {@hide} */

    /**

     * Always use {@link #loadSafeLabel safe labels} when calling {@link #loadLabel}.

     *

     * @param forceSafeLabels {@code true} to enforce safe labels

     *

     * @hide

     */

    @SystemApi

    public static void setForceSafeLabels(boolean forceSafeLabels) {

        sForceSafeLabels = forceSafeLabels;

package android.permissionpresenterservice;

import android.annotation.NonNull;

import android.annotation.SystemApi;

import android.app.Service;

import android.content.Context;

    public abstract List<RuntimePermissionPresentationInfo> onGetAppPermissions(String packageName);

    /**

     * Revoke the permission {@code permissionName} for app {@code packageName}

     * Revokes the permission {@code permissionName} for app {@code packageName}

     *

     * @param packageName The package for which to revoke

     * @param permissionName The permission to revoke

     */

    public abstract void onRevokeRuntimePermission(String packageName, String permissionName);

    public abstract void onRevokeRuntimePermission(@NonNull String packageName,

            @NonNull String permissionName);

    @Override

    public final IBinder onBind(Intent intent) {