AndroidLauncher3/1210_r27/Code/quickstep/res/layout/rotate_suggestion.xml

<?xml version="1.0" encoding="utf-8"?>
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  ~ Copyright (C) 2021 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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<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >
    <com.android.systemui.shared.rotation.FloatingRotationButtonView
        android:id="@+id/rotate_suggestion"
        android:layout_width="@dimen/floating_rotation_button_diameter"
        android:layout_height="@dimen/floating_rotation_button_diameter"
        android:paddingStart="@dimen/navigation_key_padding"
        android:paddingEnd="@dimen/navigation_key_padding"
        android:layout_gravity="bottom|left"
        android:scaleType="center"
        android:visibility="invisible" />
</FrameLayout>