Update from https://crrev.com/314320

net/base/address_tracker_linux.h

 // 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.
 
 #ifndef NET_BASE_ADDRESS_TRACKER_LINUX_H_
 #define NET_BASE_ADDRESS_TRACKER_LINUX_H_
 
 #include <sys/socket.h>  // Needed to include netlink.
 // Mask superfluous definition of |struct net|. This is fixed in Linux 2.6.38.
 #define net net_kernel
@@ skipping 47 matching lines @@
 
   AddressMap GetAddressMap() const;
 
   // Returns set of interface indicies for online interfaces.
   base::hash_set<int> GetOnlineLinks() const;
 
   // Implementation of NetworkChangeNotifierLinux::GetCurrentConnectionType().
   // Safe to call from any thread, but will block until Init() has completed.
   NetworkChangeNotifier::ConnectionType GetCurrentConnectionType();
 
+  // Returns the name for the interface with interface index |interface_index|.
+  // |buf| should be a pointer to an array of size IFNAMSIZ. The returned
+  // pointer will point to |buf|. This function acts like if_indextoname which
+  // cannot be used as net/if.h cannot be mixed with linux/if.h. We'll stick
+  // with exclusively talking to the kernel and not the C library.
+  static char* GetInterfaceName(int interface_index, char* buf);
+
  private:
   friend class AddressTrackerLinuxTest;
 
   // In tracking mode, holds |lock| while alive. In non-tracking mode,
   // enforces single-threaded access.
   class AddressTrackerAutoLock {
    public:
     AddressTrackerAutoLock(const AddressTrackerLinux& tracker,
                            base::Lock& lock);
     ~AddressTrackerAutoLock();
 
    private:
     const AddressTrackerLinux& tracker_;
     base::Lock& lock_;
     DISALLOW_COPY_AND_ASSIGN(AddressTrackerAutoLock);
   };
 
   // A function that returns the name of an interface given the interface index
-  // in |interface_index|.
-  typedef const char* (*GetInterfaceNameFunction)(int interface_index);
+  // in |interface_index|. |ifname| should be a buffer of size IFNAMSIZ. The
+  // function should return a pointer to |ifname|.
+  typedef char* (*GetInterfaceNameFunction)(int interface_index, char* ifname);
 
   // Sets |*address_changed| to indicate whether |address_map_| changed and
   // sets |*link_changed| to indicate if |online_links_| changed and sets
   // |*tunnel_changed| to indicate if |online_links_| changed with regards to a
   // tunnel interface while reading messages from |netlink_fd_|.
   void ReadMessages(bool* address_changed,
                     bool* link_changed,
                     bool* tunnel_changed);
 
   // Sets |*address_changed| to true if |address_map_| changed, sets
   // |*link_changed| to true if |online_links_| changed, sets |*tunnel_changed|
   // to true if |online_links_| changed with regards to a tunnel interface while
   // reading the message from |buffer|.
   void HandleMessage(char* buffer,
                      size_t length,
                      bool* address_changed,
                      bool* link_changed,
                      bool* tunnel_changed);
 
   // Call when some part of initialization failed; forces online and unblocks.
   void AbortAndForceOnline();
 
   // MessageLoopForIO::Watcher:
   void OnFileCanReadWithoutBlocking(int fd) override;
   void OnFileCanWriteWithoutBlocking(int /* fd */) override;
 
   // Close |netlink_fd_|
   void CloseSocket();
 
-  // Does |msg| refer to a tunnel interface?
-  bool IsTunnelInterface(const struct ifinfomsg* msg) const;
+  // Does |interface_index| refer to a tunnel interface?
+  bool IsTunnelInterface(int interface_index) const;
+
+  // Updates current_connection_type_ based on the network list.
+  void UpdateCurrentConnectionType();
 
   // Gets the name of an interface given the interface index |interface_index|.
   // May return empty string if it fails but should not return NULL. This is
   // overridden by tests.
   GetInterfaceNameFunction get_interface_name_;
 
   base::Closure address_callback_;
   base::Closure link_callback_;
   base::Closure tunnel_callback_;
 
   int netlink_fd_;
   base::MessageLoopForIO::FileDescriptorWatcher watcher_;
 
   mutable base::Lock address_map_lock_;
   AddressMap address_map_;
 
   // Set of interface indices for links that are currently online.
   mutable base::Lock online_links_lock_;
   base::hash_set<int> online_links_;
 
-  base::Lock is_offline_lock_;
-  bool is_offline_;
-  bool is_offline_initialized_;
-  base::ConditionVariable is_offline_initialized_cv_;
+  base::Lock connection_type_lock_;
+  bool connection_type_initialized_;
+  base::ConditionVariable connection_type_initialized_cv_;
+  NetworkChangeNotifier::ConnectionType current_connection_type_;
   bool tracking_;
 
   // Used to verify single-threaded access in non-tracking mode.
   base::ThreadChecker thread_checker_;
 };
 
 }  // namespace internal
 }  // namespace net
 
 #endif  // NET_BASE_ADDRESS_TRACKER_LINUX_H_