Don't crash when closing UI while waiting for apps to respond.

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

Index: chrome/android/javatests/src/org/chromium/chrome/browser/payments/PaymentRequestPaymentAppTest.java
diff --git a/chrome/android/javatests/src/org/chromium/chrome/browser/payments/PaymentRequestPaymentAppTest.java b/chrome/android/javatests/src/org/chromium/chrome/browser/payments/PaymentRequestPaymentAppTest.java
index 8c17d1279688435f01f6492a3e07b951bbd87942..7312837d881830573f9e4d6ddc29626f268a73f6 100644
--- a/chrome/android/javatests/src/org/chromium/chrome/browser/payments/PaymentRequestPaymentAppTest.java
+++ b/chrome/android/javatests/src/org/chromium/chrome/browser/payments/PaymentRequestPaymentAppTest.java
@@ -6,6 +6,7 @@ package org.chromium.chrome.browser.payments;
 
 import android.test.suitebuilder.annotation.MediumTest;
 
+import org.chromium.base.ThreadUtils;
 import org.chromium.chrome.R;
 
 import java.util.concurrent.ExecutionException;
@@ -59,6 +60,43 @@ public class PaymentRequestPaymentAppTest extends PaymentRequestTestBase {
     }
 
     /**
+     * If the payment app responds with more instruments after the UI has been dismissed, don't
+     * crash.
+     */
+    @MediumTest
+    public void testPaymentWithInstrumentsAppResponseAfterDismissShouldNotCrash()
+            throws InterruptedException, ExecutionException, TimeoutException {
+        final BobPay app = installPaymentApp(HAVE_INSTRUMENTS, IMMEDIATE_RESPONSE);
+        triggerUIAndWait(mReadyForInput);
+        clickAndWait(R.id.close_button, mDismissed);
+        ThreadUtils.runOnUiThreadBlocking(new Runnable() {
+            @Override
+            public void run() {
+                app.respond();
+            }
+        });
+        expectResultContains(new String[]{"show() rejected", "Request cancelled"});
+    }
+
+    /**
+     * If the payment app responds with no instruments after the UI has been dismissed, don't crash.
+     */
+    @MediumTest
+    public void testPaymentAppNoInstrumentsResponseAfterDismissShouldNotCrash()
+            throws InterruptedException, ExecutionException, TimeoutException {
+        final BobPay app = installPaymentApp(NO_INSTRUMENTS, IMMEDIATE_RESPONSE);
+        triggerUIAndWait(mShowFailed);
+        ThreadUtils.runOnUiThreadBlocking(new Runnable() {
+            @Override
+            public void run() {
+                app.respond();
+            }
+        });
+        expectResultContains(
+                new String[]{"show() rejected", "The payment method is not supported"});
+    }
+
+    /**
      * If Bob Pay is supported and installed, user should be able to pay with it. Here Bob Pay
      * responds to Chrome immediately.
      */