SystemUI: implement better partial screenshot

<?xml version="1.0" encoding="utf-8"?>

<shape xmlns:android="http://schemas.android.com/apk/res/android"

    android:shape="oval">

    <solid android:color="#a0000000" />

    <size android:width="48dp" android:height="48dp" />

</shape>

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">

    <item

        android:drawable="@drawable/ic_screenshot_selector_bg"

        android:height="48dp"

        android:width="48dp" />

    <item

        android:drawable="@drawable/ic_screenshot_selector_cancel_fg"

        android:height="24dp"

        android:width="24dp"

        android:left="12dp"

        android:top="12dp" />

</layer-list>

<vector xmlns:android="http://schemas.android.com/apk/res/android"

    android:height="24dp"

    android:width="24dp"

    android:viewportWidth="24"

    android:viewportHeight="24">

    <path android:fillColor="#fff" android:pathData="M19,6.41L17.59,5L12,10.59L6.41,5L5,6.41L10.59,12L5,17.59L6.41,19L12,13.41L17.59,19L19,17.59L13.41,12L19,6.41Z" />

</vector>

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">

    <item

        android:drawable="@drawable/ic_screenshot_selector_bg"

        android:height="48dp"

        android:width="48dp" />

    <item

        android:drawable="@drawable/ic_screenshot_selector_capture_fg"

        android:height="24dp"

        android:width="24dp"

        android:left="12dp"

        android:top="12dp" />

</layer-list>

<vector xmlns:android="http://schemas.android.com/apk/res/android"

    android:height="24dp"

    android:width="24dp"

    android:viewportWidth="24"

    android:viewportHeight="24">

    <path android:fillColor="#fff" android:pathData="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z" />

</vector>