Test dismissing CVC prompt for PaymentRequest

chrome/android/java/src/org/chromium/chrome/browser/payments/ui/PaymentRequestUI.java

Index: chrome/android/java/src/org/chromium/chrome/browser/payments/ui/PaymentRequestUI.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/payments/ui/PaymentRequestUI.java b/chrome/android/java/src/org/chromium/chrome/browser/payments/ui/PaymentRequestUI.java
index 8b7b2cbb28f7bc436c06612319306efbd8a02595..771a8bd090eae11f0813398a7c700ce7970d5c27 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/payments/ui/PaymentRequestUI.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/payments/ui/PaymentRequestUI.java
@@ -129,6 +129,11 @@ public class PaymentRequestUI implements DialogInterface.OnDismissListener, View
         void onPaymentRequestReadyToPay(PaymentRequestUI ui);
 
         /**
+         * Called when the result UI is showing.
+         */
+        void onPaymentRequestResultReady(PaymentRequestUI ui);
+
+        /**
          * Called when the UI is gone.
          */
         void onPaymentRequestDismiss();
@@ -342,6 +347,7 @@ public class PaymentRequestUI implements DialogInterface.OnDismissListener, View
     public void close(boolean paymentSuccess, final Runnable callback) {
         mIsClientClosing = true;
         mResultUI.update(paymentSuccess, mDialog, callback);
+        if (mObserverForTest != null) mObserverForTest.onPaymentRequestResultReady(this);
     }
 
     /**