chrome/android/java/res_download/layout/download_manager_toolbar.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright 2016 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. -->

<org.chromium.chrome.browser.download.ui.DownloadManagerToolbar
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    style="@style/ModernToolbar" >

    <android.support.v7.widget.AppCompatSpinner
        android:id="@+id/spinner"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:backgroundTint="@color/standard_mode_tint" />

</org.chromium.chrome.browser.download.ui.DownloadManagerToolbar>