[Web Payments] Handle "Enter" accelerator when there's a primary action

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

 // Copyright 2017 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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_PAYMENTS_PAYMENT_REQUEST_DIALOG_VIEW_IDS_H_
 #define CHROME_BROWSER_UI_VIEWS_PAYMENTS_PAYMENT_REQUEST_DIALOG_VIEW_IDS_H_
 
 #include "components/autofill/core/browser/field_types.h"
 
 // This defines an enumeration of IDs that can uniquely identify a view within
@@ skipping 48 matching lines @@
   // Used in selectable rows. Each row in a view reuses this ID, but the ID is
   // unique at the scope of the parent row.
   CHECKMARK_VIEW,
 
   // 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,
+
+  // The following are the ids for the individual sheets.
+  CONTACT_INFO_EDITOR_SHEET,
+  CREDIT_CARD_EDITOR_SHEET,
+  CVC_UNMASK_SHEET,
+  SHIPPING_ADDRESS_EDITOR_SHEET,
 };
 
 }  // namespace payments
 
 #endif  // CHROME_BROWSER_UI_VIEWS_PAYMENTS_PAYMENT_REQUEST_DIALOG_VIEW_IDS_H_