[Payments] PR: Basic test for the order summary section.

chrome/test/data/payments/no_shipping.js

Index: chrome/test/data/payments/no_shipping.js
diff --git a/chrome/test/data/payments/no_shipping.js b/chrome/test/data/payments/no_shipping.js
index 354fc9acb42acf1278770db823a78d67bd54fe23..27981b450a2cef620435b589701cfde9c6103c62 100644
--- a/chrome/test/data/payments/no_shipping.js
+++ b/chrome/test/data/payments/no_shipping.js
@@ -11,9 +11,17 @@
  */
 function buy() {  // eslint-disable-line no-unused-vars
   try {
-    new PaymentRequest(
-        [{supportedMethods: ['visa', 'mastercard']}],
-        {total: {label: 'Total', amount: {currency: 'USD', value: '5.00'}}})
+    new PaymentRequest([{supportedMethods: ['visa', 'mastercard']}], {
+      total: {label: 'Total', amount: {currency: 'USD', value: '5.00'}},
+      displayItems: [
+        {
+          label: 'Subtotal',
+          amount: {currency: 'USD', value: '4.50'},
+          pending: true
+        },
+        {label: 'Taxes', amount: {currency: 'USD', value: '0.50'}}
+      ]
+    })
         .show()
         .then(function(resp) {
           resp.complete('success')