Open bookmark in new background tab at Ctrl+Click but not closing menu

chrome/browser/ui/views/bookmarks/bookmark_menu_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/views/bookmarks/bookmark_menu_delegate.h"
 
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/bookmarks/bookmark_model.h"
 #include "chrome/browser/bookmarks/bookmark_model_factory.h"
 #include "chrome/browser/bookmarks/bookmark_node_data.h"
@@ skipping 117 matching lines @@
 
   const BookmarkNode* node = menu_id_to_node_map_[id];
   std::vector<const BookmarkNode*> selection;
   selection.push_back(node);
 
   chrome::OpenAll(parent_->GetNativeWindow(), page_navigator_, selection,
       chrome::DispositionFromEventFlags(mouse_event_flags));
   bookmark_utils::RecordBookmarkLaunch(location_);
 }
 
+bool BookmarkMenuDelegate::ShouldExecuteCommandWithoutClosingMenu(
+    int id, const ui::Event& event) {
+  return (event.flags() & ui::EF_LEFT_MOUSE_BUTTON) &&
+         chrome::DispositionFromEventFlags(event.flags()) == NEW_BACKGROUND_TAB;
+}
+
 bool BookmarkMenuDelegate::GetDropFormats(
     MenuItemView* menu,
     int* formats,
     std::set<ui::OSExchangeData::CustomFormat>* custom_formats) {
   *formats = ui::OSExchangeData::URL;
   custom_formats->insert(BookmarkNodeData::GetBookmarkCustomFormat());
   return true;
 }
 
 bool BookmarkMenuDelegate::AreDropTypesRequired(MenuItemView* menu) {
@@ skipping 342 matching lines @@
 MenuItemView* BookmarkMenuDelegate::GetMenuByID(int id) {
   for (NodeToMenuMap::const_iterator i(node_to_menu_map_.begin());
        i != node_to_menu_map_.end(); ++i) {
     MenuItemView* menu = i->second->GetMenuItemByID(id);
     if (menu)
       return menu;
   }
 
   return parent_menu_item_ ? parent_menu_item_->GetMenuItemByID(id) : NULL;
 }