[Downloads/Phone] Add button to icon row for offlining pages

chrome/android/java/res/values-v17/styles.xml

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2014 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. -->
 
 <resources xmlns:tools="http://schemas.android.com/tools">
     <!-- Q: Why put style resources under values-v17/ ?
          A: Problem:
             1. paddingStart causes a crash on Galaxy Tab&Note b/8351339.
             2. So we wrote a build script(generate_v14_compatible_resources.py) to convert
@@ skipping 203 matching lines @@
         <item name="android:textAlignment">viewStart</item>
         <item name="android:paddingTop">10dp</item>
     </style>
 
     <style name="OverflowMenuTheme" parent="Theme.AppCompat.Light">
         <item name="android:popupBackground">@null</item>
         <item name="android:listDivider">@null</item>
         <item name="android:listPreferredItemHeightSmall">48dp</item>
         <item name="android:textSize">16sp</item>
     </style>
+    <style name="OverflowMenuButton">
+        <item name="android:layout_width">0dp</item>
+        <item name="android:layout_height">match_parent</item>
+        <item name="android:layout_weight">1</item>
+        <item name="android:background">?attr/listChoiceBackgroundIndicator</item>
+        <item name="android:scaleType">center</item>
+    </style>
     <style name="OverflowMenuAnim">
         <item name="android:windowEnterAnimation">@anim/menu_enter</item>
         <item name="android:windowExitAnimation">@anim/menu_exit</item>
     </style>
     <style name="DistilledPagePrefThemeButton">
         <item name="android:layout_width">0dp</item>
         <item name="android:layout_height">wrap_content</item>
         <item name="android:layout_weight">1</item>
         <item name="android:button">@null</item>
         <item name="android:gravity">center</item>
@@ skipping 322 matching lines @@
     <style name="RobotoMediumStyle">
         <item name="android:fontFamily">sans-serif</item>
         <item name="android:textStyle">bold</item>
     </style>
 
     <!-- New tab page RecyclerView overscroll color -->
     <style name="NewTabPageRecyclerView">
         <item name="android:colorEdgeEffect">@color/google_grey_300</item>
     </style>
 </resources>