chromium/chrome/browser/autofill/android/java/res/layout/payment_request_editor_dropdown.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
Copyright 2016 The Chromium Authors
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->

<LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="@dimen/editor_dialog_section_small_spacing"
        android:layout_marginBottom="@dimen/editor_dialog_section_large_spacing"
        android:layout_marginStart="@dimen/pref_autofill_field_horizontal_padding"
        android:layout_marginEnd="@dimen/pref_autofill_field_horizontal_padding"
        android:orientation="vertical">

    <TextView
            android:id="@+id/spinner_label"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textAppearance="@style/TextAppearance.TextSmall.Secondary" />

    <androidx.appcompat.widget.AppCompatSpinner
            android:id="@+id/spinner"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:dropDownWidth="match_parent"
            android:paddingBottom="@dimen/pref_autofill_dropdown_vertical_padding"
            android:paddingLeft="0dp"
            android:paddingRight="0dp"
            android:paddingTop="@dimen/pref_autofill_dropdown_vertical_padding" />

    <View android:id="@+id/spinner_underline" style="@style/PreferenceSpinnerUnderlineView" />

    <TextView
            android:id="@+id/spinner_error"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="@dimen/pref_autofill_field_top_margin"
            android:visibility="gone"
            android:textAppearance="@style/TextAppearance.ErrorCaption" />

</LinearLayout>