[Payments] Update some editor titles to reflect missing information

chrome/browser/ui/views/payments/credit_card_editor_view_controller.cc

 // 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.
 
 #include "chrome/browser/ui/views/payments/credit_card_editor_view_controller.h"
 
 #include <memory>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 255 matching lines @@
       return std::unique_ptr<ui::ComboboxModel>(
           new ui::SimpleComboboxModel(GetExpirationYearItems()));
     default:
       NOTREACHED();
       break;
   }
   return std::unique_ptr<ui::ComboboxModel>();
 }
 
 base::string16 CreditCardEditorViewController::GetSheetTitle() {
-  return l10n_util::GetStringUTF16(
-      IDS_PAYMENT_REQUEST_CREDIT_CARD_EDITOR_ADD_TITLE);
+  if (!credit_card_to_edit_)
+    return l10n_util::GetStringUTF16(
+        IDS_PAYMENT_REQUEST_CREDIT_CARD_EDITOR_ADD_TITLE);
+
+  // Gets the completion message, or empty if nothing is missing from the card.
+  base::string16 title = autofill::GetCompletionMessageForCard(
+      autofill::GetCompletionStatusForCard(*credit_card_to_edit_,
+                                           state()->GetApplicationLocale()));
+  return title.empty() ? l10n_util::GetStringUTF16(IDS_PAYMENTS_EDIT_CARD)
+                       : title;
 }
 
 CreditCardEditorViewController::CreditCardValidationDelegate::
     CreditCardValidationDelegate(
         const EditorField& field,
         EditorViewController* controller,
         const std::vector<std::string>& supported_card_networks)
     : field_(field),
       controller_(controller),
       supported_card_networks_(supported_card_networks.begin(),
@@ skipping 27 matching lines @@
   bool is_required_valid = !field_.required;
   const base::string16 displayed_message =
       is_required_valid ? base::ASCIIToUTF16("")
                         : l10n_util::GetStringUTF16(
                               IDS_PAYMENTS_FIELD_REQUIRED_VALIDATION_MESSAGE);
   controller_->DisplayErrorMessageForField(field_, displayed_message);
   return is_required_valid;
 }
 
 }  // namespace payments