packages/SystemUI/res-keyguard/drawable/progress_bar.xml

<?xml version="1.0" encoding="utf-8"?>
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  ~ Copyright (C) 2023 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
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  ~ distributed under the License is distributed on an "AS IS" BASIS,
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<layer-list xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:androidprv="http://schemas.android.com/apk/prv/res/android"
    android:paddingMode="stack">
    <item
        android:id="@android:id/background"
        android:gravity="center_vertical|fill_horizontal">
        <shape
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:shape="rectangle">
            <corners android:radius="30dp" />
            <solid android:color="?androidprv:attr/materialColorSurfaceContainerHighest" />
        </shape>
    </item>
    <item
        android:id="@android:id/progress"
        android:gravity="center_vertical|fill_horizontal">
        <clip>
            <shape
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:shape="rectangle">
                <corners android:radius="30dp" />
                <solid android:color="?androidprv:attr/textColorPrimary" />
            </shape>
        </clip>
    </item>
</layer-list>