Add a checkbox for using the billing address for shipping

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

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright (c) 2013 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.
 -->
 <GridLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:id="@+id/general_layout"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
@@ skipping 65 matching lines @@
         android:layout_columnSpan="4"/>
     <TextView
         android:id="@+id/shipping_label"
         android:layout_marginLeft="@dimen/autofill_steady_margin"
         android:layout_columnSpan="2"
         android:textStyle="bold"
         android:textSize="@dimen/autofill_steady_text_size"/>
     <Space
           android:layout_gravity="fill"
           android:layout_columnSpan="2"/>
+    <CheckBox
+        android:id="@+id/use_billing_checkbox"
+        android:padding="@dimen/autofill_steady_margin"
+        android:textSize="@dimen/autofill_notification_text_size"
+        android:layout_gravity="fill_horizontal"
+        android:layout_columnSpan="4"/>
     <Spinner
         android:layout_margin="@dimen/autofill_steady_margin"
         android:id="@+id/address_spinner"
         android:layout_gravity="fill_horizontal"
         android:layout_columnSpan="4"/>
     <LinearLayout
         android:id="@+id/bottom_notifications"
         android:visibility="gone"
         android:layout_gravity="fill_horizontal"
         android:layout_columnSpan="4"/>
     <View
         android:id="@+id/line_bottom"
         android:layout_height="1dp"
         android:layout_columnSpan="4"
         android:background="#D9D9DC"/>
     <Button
         android:text="@string/autofill_terms_of_service"
         android:padding="10dp"
         android:visibility="gone"
         android:id="@+id/terms_info"
         android:textSize="@dimen/autofill_notification_text_size"
         android:background="?android:attr/selectableItemBackground"
         android:drawableRight="@drawable/arrow"
         android:layout_columnSpan="4"
         android:gravity="left"/>
 </GridLayout>