[Web Payments] Implement the CVC Unmask dialog.

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

Index: chrome/browser/ui/views/payments/payment_request_dialog_view_ids.h
diff --git a/chrome/browser/ui/views/payments/payment_request_dialog_view_ids.h b/chrome/browser/ui/views/payments/payment_request_dialog_view_ids.h
index e78be2b1a114be69404d428f6ec1c6894bbc9345..c6cc7cbc077ec54d9f3e9b95daa96dd1e9647b4b 100644
--- a/chrome/browser/ui/views/payments/payment_request_dialog_view_ids.h
+++ b/chrome/browser/ui/views/payments/payment_request_dialog_view_ids.h
@@ -28,6 +28,7 @@ enum class DialogViewID : int {
   PAY_BUTTON,
   CANCEL_BUTTON,
   BACK_BUTTON,
+  CVC_PROMPT_CONFIRM_BUTTON,
 
   // The following are Label objects.
   ORDER_SUMMARY_TOTAL_AMOUNT_LABEL,
@@ -54,6 +55,9 @@ enum class DialogViewID : int {
   // Used to label the error labels with an offset, which gets added to
   // the Autofill type value they represent (for tests).
   ERROR_LABEL_OFFSET,
+
+  // The CVC text field in the unmask sheet.
+  CVC_PROMPT_TEXT_FIELD,
 };
 
 }  // namespace payments