[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 a8558e15aa7f8fcb5ba751524e9eb10dbe0d1d0a..85db90324b11253965d6d63cadcc8c9bc9a1d168 100644
--- a/chrome/browser/ui/views/payments/payment_request_dialog_view.h
+++ b/chrome/browser/ui/views/payments/payment_request_dialog_view.h
@@ -55,6 +55,8 @@ class PaymentRequestDialogView : public views::DialogDelegateView,
     virtual void OnErrorMessageShown() = 0;
 
     virtual void OnSpecDoneUpdating() = 0;
+
+    virtual void OnCvcPromptShown() = 0;
   };
 
   // Build a Dialog around the PaymentRequest object. |observer| is used to
@@ -92,6 +94,12 @@ class PaymentRequestDialogView : public views::DialogDelegateView,
   void ShowShippingAddressEditor();
   void EditorViewUpdated();
 
+  void ShowCvcUnmaskPrompt(
+      const autofill::CreditCard& credit_card,
+      base::WeakPtr<autofill::payments::FullCardRequest::ResultDelegate>
+          result_delegate,
+      content::WebContents* web_contents) override;
+
   ViewStack* view_stack_for_testing() { return &view_stack_; }
 
  private: