[Web Payments] Implement the CVC Unmask dialog.

components/payments/content/payment_request_delegate.h

 // 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.
 
 #ifndef COMPONENTS_PAYMENTS_CONTENT_PAYMENT_REQUEST_DELEGATE_H_
 #define COMPONENTS_PAYMENTS_CONTENT_PAYMENT_REQUEST_DELEGATE_H_
 
 #include <string>
 
+#include "components/payments/core/autofill_payment_instrument.h"
+
 namespace autofill {
 class PersonalDataManager;
 }
 
+namespace content {
+class WebContents;
+}
+
 namespace payments {
 
 class PaymentRequest;
 
-class PaymentRequestDelegate {
+class PaymentRequestDelegate
+    : public AutofillPaymentInstrument::FullCardRequestDelegate {
  public:
-  virtual ~PaymentRequestDelegate() {}
+  ~PaymentRequestDelegate() override {}
 
   // Shows the Payment Request dialog for the given |request|.
   virtual void ShowDialog(PaymentRequest* request) = 0;
 
   // Closes the same dialog that was opened by this delegate. Must be safe to
   // call when the dialog is not showing.
   virtual void CloseDialog() = 0;
 
   // Disables the dialog and shows an error message that the transaction has
   // failed.
   virtual void ShowErrorMessage() = 0;
 
   // Gets the PersonalDataManager associated with this PaymentRequest flow.
   // Cannot be null.
   virtual autofill::PersonalDataManager* GetPersonalDataManager() = 0;
 
   virtual const std::string& GetApplicationLocale() const = 0;
 
   // Returns whether the user is in Incognito mode.
   virtual bool IsIncognito() const = 0;
+
+  // Returns the current request's web contents.
+  virtual content::WebContents* GetWebContents() = 0;
 };
 
 }  // namespace payments
 
 #endif  // COMPONENTS_PAYMENTS_CONTENT_PAYMENT_REQUEST_DELEGATE_H_