[Web Payments] Implement the CVC Unmask dialog.

components/payments/content/payment_request_dialog.h

Index: components/payments/content/payment_request_dialog.h
diff --git a/components/payments/content/payment_request_dialog.h b/components/payments/content/payment_request_dialog.h
index 5befff8d08fc695f29b2ce8227c54d2e8502b012..57d554f77d60327a090ffcf4ea2355a012475e75 100644
--- a/components/payments/content/payment_request_dialog.h
+++ b/components/payments/content/payment_request_dialog.h
@@ -5,6 +5,8 @@
 #ifndef COMPONENTS_PAYMENTS_CONTENT_PAYMENT_REQUEST_DIALOG_H_
 #define COMPONENTS_PAYMENTS_CONTENT_PAYMENT_REQUEST_DIALOG_H_
 
+#include "components/autofill/core/browser/payments/full_card_request.h"
+
 namespace payments {
 
 // Used to interact with a cross-platform Payment Request dialog.
@@ -15,6 +17,9 @@ class PaymentRequestDialog {
   virtual void ShowDialog() = 0;
 
   virtual void CloseDialog() = 0;
+
+  virtual base::WeakPtr<autofill::payments::FullCardRequest::UIDelegate>
+  GetFullCardRequestUIDelegate() = 0;
 };
 
 }  // namespace payments