Reapply r50859 with chromeos fixes.

app/menus/button_menu_item_model.cc

+// Copyright (c) 2010 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 "app/menus/button_menu_item_model.h"
+
+#include "app/l10n_util.h"
+
+namespace menus {
+
+ButtonMenuItemModel::ButtonMenuItemModel(
+    int string_id,
+    ButtonMenuItemModel::Delegate* delegate)
+    : item_label_(l10n_util::GetStringUTF16(string_id)),
+      delegate_(delegate) {
+}
+
+void ButtonMenuItemModel::AddItemWithStringId(int command_id, int string_id) {
+  Item item = { command_id, TYPE_BUTTON, l10n_util::GetStringUTF16(string_id),
+                SIDE_BOTH, -1 };
+  items_.push_back(item);
+}
+
+void ButtonMenuItemModel::AddItemWithImage(int command_id,
+                                           int icon_idr) {
+  Item item = { command_id, TYPE_BUTTON, string16(), SIDE_BOTH, icon_idr };
+  items_.push_back(item);
+}
+
+void ButtonMenuItemModel::AddSpace() {
+  Item item = { 0, TYPE_SPACE, string16(), SIDE_NONE, -1 };
+  items_.push_back(item);
+}
+
+int ButtonMenuItemModel::GetItemCount() const {
+  return static_cast<int>(items_.size());
+}
+
+ButtonMenuItemModel::ButtonType ButtonMenuItemModel::GetTypeAt(
+    int index) const {
+  return items_[index].type;
+}
+
+int ButtonMenuItemModel::GetCommandIdAt(int index) const {
+  return items_[index].command_id;
+}
+
+const string16& ButtonMenuItemModel::GetLabelAt(int index) const {
+  return items_[index].label;
+}
+
+bool ButtonMenuItemModel::GetIconAt(int index, int* icon_idr) const {
+  if (items_[index].icon_idr == -1)
+    return false;
+
+  *icon_idr = items_[index].icon_idr;
+  return true;
+}
+
+void ButtonMenuItemModel::ActivatedCommand(int command_id) {
+  if (delegate_)
+    delegate_->ExecuteCommand(command_id);
+}
+
+}  // namespace menus