Add QuotaChangeListener interface.

/*

 * Copyright (C) 2019 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.android.server.utils.quota;

import android.annotation.NonNull;

import android.annotation.Nullable;

/**

 * Listener that is notified when a UPTC goes in and out of quota.

 *

 * @see Uptc

 */

public interface QuotaChangeListener {

    /**

     * Called when the UPTC reaches its quota or comes back into quota.

     *

     * @see Uptc

     */

    void onQuotaStateChanged(int userId, @NonNull String packageName, @Nullable String tag);

}