chrome/android/java/res/layout/preference_spinner_single_line.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright 2017 The Chromium Authors. All rights reserved.
     Use of this source code is governed by a BSD-style license that can be
     found in the LICENSE file. -->

<!-- Layout used by SpinnerPreference if singleLine is set to true and the device's smallest width
     is less than 360dp. This layout doesn't actually use a single line for text and spinner but is
     used as a fallback for small devices. -->

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    style="@style/PreferenceLayout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:paddingEnd="8dp"
    android:orientation="vertical">

    <TextView
        android:id="@+id/title"
        android:layout_height="wrap_content"
        android:layout_width="match_parent" />

    <Spinner
        android:id="@+id/spinner"
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        android:textSize="16sp"
        android:paddingTop="6dp" />

</LinearLayout>