[Web Payments] Implement the CVC Unmask dialog.

components/payments/content/payment_request_state_unittest.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 "components/payments/content/payment_request_state.h"
 
 #include <utility>
 
 #include "base/memory/weak_ptr.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 37 matching lines @@
     num_on_selected_information_changed_called_++;
   }
 
   // PaymentRequestState::Delegate:
   void OnPaymentResponseAvailable(mojom::PaymentResponsePtr response) override {
     payment_response_ = std::move(response);
   };
   void OnShippingOptionIdSelected(std::string shipping_option_id) override {}
   void OnShippingAddressSelected(mojom::PaymentAddressPtr address) override {}
 
+  PaymentRequestDelegate* GetPaymentRequestDelegate() override {
+    return nullptr;
+  }
+
   void RecreateStateWithOptionsAndDetails(
       mojom::PaymentOptionsPtr options,
       mojom::PaymentDetailsPtr details,
       std::vector<mojom::PaymentMethodDataPtr> method_data) {
     // The spec will be based on the |options| and |details| passed in.
     spec_ = base::MakeUnique<PaymentRequestSpec>(
         std::move(options), std::move(details), std::move(method_data), nullptr,
         "en-US");
     state_ = base::MakeUnique<PaymentRequestState>(
         spec_.get(), this, "en-US", &test_personal_data_manager_);
@@ skipping 323 matching lines @@
   EXPECT_TRUE(state()->is_ready_to_pay());
   state()->GeneratePaymentResponse();
 
   // Check that the name was set, but not the other values.
   EXPECT_EQ("John H. Doe", response()->payer_name.value());
   EXPECT_FALSE(response()->payer_phone.has_value());
   EXPECT_FALSE(response()->payer_email.has_value());
 }
 
 }  // namespace payments