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

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright 2015 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. -->

<!-- Wrap a framelayout because android list view does not respect margins. -->
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="17dp" >

    <View
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:layout_gravity="center_vertical"
        android:background="#ffD6D6D6" />

</FrameLayout>