[Web Payments] Implement the CVC Unmask dialog.

chrome/browser/ui/views/payments/payment_request_dialog_view.h

Index: chrome/browser/ui/views/payments/payment_request_dialog_view.h
diff --git a/chrome/browser/ui/views/payments/payment_request_dialog_view.h b/chrome/browser/ui/views/payments/payment_request_dialog_view.h
index 8c1738e68cb69d0296b5dd317db34aae7e38c179..a1fb2da2600ed6882f5fda8af45ad5154b9f6e25 100644
--- a/chrome/browser/ui/views/payments/payment_request_dialog_view.h
+++ b/chrome/browser/ui/views/payments/payment_request_dialog_view.h
@@ -68,7 +68,7 @@ class PaymentRequestDialogView : public views::DialogDelegateView,
   bool ShouldShowCloseButton() const override;
   int GetDialogButtons() const override;
 
-  // payments::PaymentRequestDialog
+  // PaymentRequestDialog
   void ShowDialog() override;
   void CloseDialog() override;
   void ShowErrorMessage() override;
@@ -84,6 +84,11 @@ class PaymentRequestDialogView : public views::DialogDelegateView,
   void ShowShippingAddressEditor();
   void EditorViewUpdated();
 
+  void ShowCvcUnmaskPrompt(
+      const autofill::CreditCard& credit_card,
+      base::WeakPtr<autofill::payments::FullCardRequest::ResultDelegate>
+          result_delegate) override;
+
   ViewStack* view_stack_for_testing() { return &view_stack_; }
 
  private: