alternate ntp: add "Recent Tabs" submenu to wrench menu

chrome/browser/ui/toolbar/recent_tabs_menu_model_delegate.cc

+// Copyright (c) 2012 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/toolbar/recent_tabs_menu_model_delegate.h"
+
+#include "ui/base/models/menu_model.h"
+#include "ui/gfx/image/image.h"
+#include "ui/views/controls/menu/menu_item_view.h"
+
+RecentTabsMenuModelDelegate::RecentTabsMenuModelDelegate(
+    ui::MenuModel* model,
+    views::MenuItemView* menu_item)
+    : model_(model),
+      menu_item_(menu_item) {
+  model_->SetMenuModelDelegate(this);
+}
+
+RecentTabsMenuModelDelegate::~RecentTabsMenuModelDelegate() {
+  model_->SetMenuModelDelegate(NULL);
+}
+
+void RecentTabsMenuModelDelegate::OnIconChanged(int index) {
+  // |index| specifies position in children items of |menu_item_| starting at 0,
+  // its corresponding command id as used in the children menu item views
+  // follows that of the parent menu item view |menu_item_|.
+  int command_id = menu_item_->GetCommand() + 1 + index;
+  views::MenuItemView* item = menu_item_->GetMenuItemByID(command_id);
+  DCHECK(item);
+  gfx::Image icon;
+  if (model_->GetIconAt(index, &icon))
+    item->SetIcon(*icon.ToImageSkia());
+}