[Web Payments] Implement the CVC Unmask dialog.

chrome/browser/ui/views/payments/cvc_unmask_view_controller_browsertest.cc

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/strings/utf_string_conversions.h"
+#include "chrome/browser/ui/views/payments/payment_request_browsertest_base.h"
+#include "components/autofill/core/browser/autofill_test_utils.h"
+
+namespace payments {
+
+class CvcUnmaskViewControllerTest : public PaymentRequestBrowserTestBase {
+ protected:
+  CvcUnmaskViewControllerTest()
+      : PaymentRequestBrowserTestBase(
+            "/payment_request_no_shipping_test.html") {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(CvcUnmaskViewControllerTest);
+};
+
+IN_PROC_BROWSER_TEST_F(CvcUnmaskViewControllerTest, CvcSentToResponse) {
+  AddCreditCard(autofill::test::GetCreditCard());  // Visa.
+
+  InvokePaymentRequestUI();
+  ResetEventObserver(DialogEvent::DIALOG_CLOSED);
+  PayWithCreditCardAndWait(base::ASCIIToUTF16("012"));
+
+  ExpectBodyContains(std::vector<base::string16>{
+      base::UTF8ToUTF16("\"cardSecurityCode\": \"012\"")});
+}
+
+}  // namespace payments