MD History: Add tooltip for history menu button

chrome/browser/ui/webui/settings/md_settings_localized_strings_provider.cc

 // 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.
 
 #include "chrome/browser/ui/webui/settings/md_settings_localized_strings_provider.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/i18n/number_formatting.h"
@@ skipping 54 matching lines @@
       {"cancel", IDS_CANCEL},
       {"confirm", IDS_CONFIRM},
       {"disable", IDS_DISABLE},
       {"learnMore", IDS_LEARN_MORE},
       {"ok", IDS_OK},
       {"save", IDS_SAVE},
       {"advancedPageTitle", IDS_SETTINGS_ADVANCED},
       {"basicPageTitle", IDS_SETTINGS_BASIC},
       {"settings", IDS_SETTINGS_SETTINGS},
       {"restart", IDS_SETTINGS_RESTART},
+      {"menuButtonLabel", IDS_SETTINGS_MENU_BUTTON_LABEL},
   };
   AddLocalizedStringsBulk(html_source, localized_strings,
                           arraysize(localized_strings));
 
   html_source->AddBoolean(
       "isGuest",
 #if defined(OS_CHROMEOS)
       user_manager::UserManager::Get()->IsLoggedInAsGuest());
 #else
       profile->IsOffTheRecord());
@@ skipping 1339 matching lines @@
 #endif
   AddUsersStrings(html_source);
   AddWebContentStrings(html_source);
 
   policy_indicator::AddLocalizedStrings(html_source);
 
   html_source->SetJsonPath(kLocalizedStringsFile);
 }
 
 }  // namespace settings