[WebPayments] Desktop implementation of Contact Editor

chrome/test/data/payments/contact_details.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 requests contact details.
  */
 function buy() {  // eslint-disable-line no-unused-vars
   try {
     new PaymentRequest(
-        [{supportedMethods: ['https://bobpay.com']}],
+        [{supportedMethods: ['https://bobpay.com', 'amex']}],
         {total: {label: 'Total', amount: {currency: 'USD', value: '5.00'}}},
         {requestPayerName: true, requestPayerEmail: true,
          requestPayerPhone: true})
         .show()
         .then(function(resp) {
           resp.complete('success')
               .then(function() {
                 print(
                     resp.payerName + '<br>' + resp.payerEmail + '<br>' +
                     resp.payerPhone + '<br>' + resp.methodName + '<br>' +
                     JSON.stringify(resp.details, undefined, 2));
               })
               .catch(function(error) {
                 print(error);
               });
         })
         .catch(function(error) {
           print(error);
         });
   } catch (error) {
     print(error.message);
   }
 }