Add a ComboboxModel and strings for the account chooser's "More" button.

chrome/browser/ui/passwords/account_chooser_more_combobox_model.h

+// Copyright 2015 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_PASSWORDS_ACCOUNT_CHOOSER_MORE_COMBOBOX_MODEL_H_
+#define CHROME_BROWSER_UI_PASSWORDS_ACCOUNT_CHOOSER_MORE_COMBOBOX_MODEL_H_
+
+#include "ui/base/models/combobox_model.h"
+
+// Model for the account chooser's "More" combobox.
+class AccountChooserMoreComboboxModel : public ui::ComboboxModel {
+ public:
+  AccountChooserMoreComboboxModel();
+  ~AccountChooserMoreComboboxModel() override;
+
+  // Index constants.
+  static const int INDEX_MORE;
+  static const int INDEX_LEARN_MORE;
+  static const int INDEX_SETTINGS;
+
+  // ui::ComboboxModel:
+  int GetItemCount() const override;
+  base::string16 GetItemAt(int index) override;
+  bool IsItemSeparatorAt(int index) override;
+  int GetDefaultIndex() const override;
+  bool IsItemEnabledAt(int index) const override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(AccountChooserMoreComboboxModel);
+};
+
+#endif  // CHROME_BROWSER_UI_PASSWORDS_ACCOUNT_CHOOSER_MORE_COMBOBOX_MODEL_H_