Create a Tether section in the system tray network list.

ash/common/system/chromeos/network/network_list_md.h

 // Copyright 2016 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 ASH_COMMON_SYSTEM_CHROMEOS_NETWORK_NETWORK_LIST_MD_H_
 #define ASH_COMMON_SYSTEM_CHROMEOS_NETWORK_NETWORK_LIST_MD_H_
 
 #include <map>
 #include <memory>
 #include <set>
@@ skipping 90 matching lines @@
 
   // network_icon::AnimationObserver:
   void NetworkIconChanged() override;
 
   bool needs_relayout_;
   NetworkListDelegate* delegate_;
 
   views::Label* no_wifi_networks_view_;
   views::Label* no_cellular_networks_view_;
   SectionHeaderRowView* cellular_header_view_;
+  SectionHeaderRowView* tether_header_view_;
   SectionHeaderRowView* wifi_header_view_;
   views::Separator* cellular_separator_view_;
+  views::Separator* tether_separator_view_;
   views::Separator* wifi_separator_view_;
 
   // An owned list of network info.
   std::vector<std::unique_ptr<NetworkInfo>> network_list_;
 
   using NetworkMap = std::map<views::View*, std::string>;
   NetworkMap network_map_;
 
   // A map of network guids to their view.
   typedef std::map<std::string, views::View*> NetworkGuidMap;
   NetworkGuidMap network_guid_map_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkListViewMd);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_CHROMEOS_NETWORK_NETWORK_LIST_MD_H_