[Home] Add a bottom navigation bar for the BottomSheet

chrome/android/java/res/layout/main.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. -->
 
 <merge xmlns:android="http://schemas.android.com/apk/res/android">
     <LinearLayout
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:orientation="vertical">
@@ skipping 52 matching lines @@
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content" />
 
             <ViewStub
                 android:id="@+id/empty_container_stub"
                 android:inflatedId="@+id/empty_container"
                 android:layout="@layout/empty_background_view_tablet"
                 android:layout_width="match_parent"
                 android:layout_height="match_parent" />
 
+            <ViewStub
+                android:id="@+id/bottom_nav_stub"
+                android:layout_width="match_parent"
+                android:layout_height="@dimen/bottom_nav_height"
+                android:layout_gravity="start|bottom"
+                android:inflatedId="@+id/bottom_nav"
+                android:layout="@layout/bottom_sheet_bottom_nav" />
+
         </android.support.design.widget.CoordinatorLayout>
 
         <HorizontalScrollView
             android:id="@+id/keyboard_accessory"
             android:layout_height="@dimen/keyboard_accessory_height"
             android:layout_width="match_parent"
             android:background="@drawable/keyboard_accessory_background"
             android:contentDescription="@string/autofill_keyboard_accessory_content_description"
             android:fillViewport="true"
             android:scrollbars="none"
             android:visibility="gone" />
     </LinearLayout>
 
     <!-- This empty view is used as the anchor for custom menu -->
     <View
         android:id="@+id/menu_anchor_stub"
         android:layout_width="0px"
         android:layout_height="0px"
         android:layout_gravity="bottom|start"
         />
 </merge>