[Payments] Add UI elements to secure branding for payments

chrome/android/java/res/layout/payment_request.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. -->
 
 <!-- PaymentRequestUI dialog
      Sits at the bottom of the screen like a Bottom Sheet.
 -->
 <org.chromium.chrome.browser.widget.BoundedLinearLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
@@ skipping 14 matching lines @@
         android:visibility="gone" >
 
         <LinearLayout
             android:id="@+id/payment_container_layout"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:orientation="vertical" />
 
     </org.chromium.chrome.browser.payments.ui.FadingEdgeScrollView>
 
-    <org.chromium.chrome.browser.widget.DualControlLayout
-        android:id="@+id/button_bar"
-        android:layout_height="wrap_content"
-        android:layout_width="match_parent"
-        android:padding="@dimen/payments_section_large_spacing"
-        android:background="@android:color/white"
-        android:visibility="gone" />
+     <include layout="@layout/payment_request_bottom_bar" />
 
 </org.chromium.chrome.browser.widget.BoundedLinearLayout>