[Payments] Fix the Payment Request histogram check failure in tests.

chrome/android/javatests/src/org/chromium/chrome/browser/payments/PaymentRequestTestBase.java

Index: chrome/android/javatests/src/org/chromium/chrome/browser/payments/PaymentRequestTestBase.java
diff --git a/chrome/android/javatests/src/org/chromium/chrome/browser/payments/PaymentRequestTestBase.java b/chrome/android/javatests/src/org/chromium/chrome/browser/payments/PaymentRequestTestBase.java
index 8b0c0ae3b7524970a9c79fda3f8609edf86b4338..3d212682810179fb8eaef04eb512e1ebe0a26644 100644
--- a/chrome/android/javatests/src/org/chromium/chrome/browser/payments/PaymentRequestTestBase.java
+++ b/chrome/android/javatests/src/org/chromium/chrome/browser/payments/PaymentRequestTestBase.java
@@ -145,6 +145,13 @@ abstract class PaymentRequestTestBase extends ChromeActivityTestCaseBase<ChromeT
         clickNodeAndWait(nodeId, helper);
     }
 
+    protected void reTriggerUIAndWait(
+            String nodeId, PaymentsCallbackHelper<PaymentRequestUI> helper)
+            throws InterruptedException, ExecutionException, TimeoutException {
+        clickNodeAndWait(nodeId, helper);
+        mUI = helper.getTarget();
+    }
+
     /** Clicks on an HTML node. */
     protected void clickNodeAndWait(String nodeId, CallbackHelper helper)
             throws InterruptedException, ExecutionException, TimeoutException {