[Payments] Implement openWindow for service worker based payment handler

content/test/data/payments/payment_app_invocation.html

Index: content/test/data/payments/payment_app_invocation.html
diff --git a/content/test/data/payments/payment_app_invocation.html b/content/test/data/payments/payment_app_invocation.html
index 5b74c69a62de824244a0c1c998d642c54d0b8937..79ba835f9d4e9195d7edbb16bf74cd0d36dcbb5f 100644
--- a/content/test/data/payments/payment_app_invocation.html
+++ b/content/test/data/payments/payment_app_invocation.html
@@ -9,10 +9,23 @@ function registerPaymentApp() {
         return navigator.serviceWorker.ready;
       })
     .then(registration => {
-        return registration.paymentManager.instruments.set('payment-app-id', {
-            name: 'Visa ****',
-            enabledMethods: ['basic-card']
-          });
+      const instrumentPromises = [
+      registration.paymentManager.instruments.set(
+        'basic-card-payment-app-id',
+        {
+          name: 'Visa ****',
+          enabledMethods: ['basic-card']
+        }),
+
+      registration.paymentManager.instruments.set(
+        'bobpay-payment-app-id',
+        {
+          name: "Bob Pay",
+          enabledMethods: ['https://bobpay.com']
+        }),
+      ];
+
+      return Promise.all(instrumentPromises);
       })
     .then(result => {
         sendResultToTest('registered');