[Web Payments] Implement the CVC Unmask dialog.

components/payments/content/payment_request.cc

 // Copyright 2016 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.h"
 
+#include <string>
 #include <utility>
 
 #include "base/memory/ptr_util.h"
 #include "components/payments/content/payment_details_validation.h"
 #include "components/payments/content/payment_request_web_contents_manager.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/web_contents.h"
 
 namespace payments {
 
@@ skipping 108 matching lines @@
 void PaymentRequest::OnShippingOptionIdSelected(
     std::string shipping_option_id) {
   client_->OnShippingOptionChange(shipping_option_id);
 }
 
 void PaymentRequest::OnShippingAddressSelected(
     mojom::PaymentAddressPtr address) {
   client_->OnShippingAddressChange(std::move(address));
 }
 
+PaymentRequestDelegate* PaymentRequest::GetPaymentRequestDelegate() {
+  return delegate_.get();
+}
+
 void PaymentRequest::UserCancelled() {
   // If |client_| is not bound, then the object is already being destroyed as
   // a result of a renderer event.
   if (!client_.is_bound())
     return;
 
   // This sends an error to the renderer, which informs the API user.
   client_->OnError(payments::mojom::PaymentErrorReason::USER_CANCEL);
 
   // We close all bindings and ask to be destroyed.
@@ skipping 12 matching lines @@
   binding_.Close();
   delegate_->CloseDialog();
   manager_->DestroyRequest(this);
 }
 
 void PaymentRequest::Pay() {
   state_->GeneratePaymentResponse();
 }
 
 }  // namespace payments