Add 'total' field to 'PaymentDetails'.

chrome/test/data/android/payments/no_shipping.js

 /*
  * 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.
  */
 
 /* global PaymentRequest:false */
 
 /**
  * Launches the PaymentRequest UI that does not require a shipping address.
  */
 function buy() {  // eslint-disable-line no-unused-vars
   try {
-    new PaymentRequest(['visa'], {
-      displayItems: [{
-        id: 'total',
-        label: 'Total',
-        amount: {currency: 'USD', value: '5.00'}
-      }]
-    })
+    new PaymentRequest(
+        ['visa'],
+        {total: {label: 'Total', amount: {currency: 'USD', value: '5.00'}}})
         .show()
         .then(function(resp) {
           resp.complete(true)
               .then(function() {
                 print(
                     resp.methodName + '<br>' +
                     JSON.stringify(resp.details, undefined, 2));
               })
               .catch(function(error) {
                 print(error.message);
               });
         })
         .catch(function(error) {
           print(error.message);
         });
   } catch (error) {
     print(error.message);
   }
 }