Android R S T U版本如何在下拉栏菜单增加基本截图功能

本文主要是MTK增加下拉栏开关菜单，功能实现为基本的截图功能，metrics_constants.proto修改 QuickSetting 新增快捷设置图标，以便对应getMetricsCategory获取；一个布局文件，一个配置加载合入实现，一个新增想要实现截图的类。

/frameworks/base/proto/src/metrics_constants/metrics_constants.proto//

SETTINGS_AWARE_DISPLAY = 1750; 

//*/add start最后代码处添加 + 数值加一即可；
    QS_SCREENSHOT = 1751;
    //*/

/vendor/mediatek/proprietary/packages/apps/SystemUI/res/drawable/ic_screenshot.xml

 新增布局文件：

<!--
Copyright (C) 2018 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.
-->
<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="24.0dp"
    android:height="24.0dp"
    android:viewportWidth="24.0"
    android:viewportHeight="24.0"
    android:tint="?attr/colorControlNormal">
    <path
        android:fillColor="#FF000000"
        android:pathData="M17,1.01L7,1C5.9,1 5,1.9 5,3v18c0,1.1 0.9,2 2,2h10c1.1,0 2,-0.9 2,-2V3C19,1.9 18.1,1.01 17,1.01zM17,21H7l0,-1h10V21zM17,18H7V6h10V18zM17,4H7V3h10V4z&#