NetInfo V3 support for browser

net/base/network_change_notifier.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_NETWORK_CHANGE_NOTIFIER_H_
 #define NET_BASE_NETWORK_CHANGE_NOTIFIER_H_
 
 #include "base/basictypes.h"
 #include "base/observer_list_threadsafe.h"
 #include "base/time/time.h"
@@ skipping 17 matching lines @@
 // NetworkChangeNotifier monitors the system for network changes, and notifies
 // registered observers of those events.  Observers may register on any thread,
 // and will be called back on the thread from which they registered.
 // NetworkChangeNotifiers are threadsafe, though they must be created and
 // destroyed on the same thread.
 class NET_EXPORT NetworkChangeNotifier {
  public:
   // Using the terminology of the Network Information API:
   // http://www.w3.org/TR/netinfo-api.
   enum ConnectionType {
     CONNECTION_UNKNOWN = 0, // A connection exists, but its type is unknown.

[brettw, 2014/05/27 18:26:36]

It seems like this comment is wrong given that the network change notifier also
returns this if you request the status before its initialized (in which case you
may have no connection). Is this also your understanding? Can we clarify this?

[jkarlin, 2014/05/27 18:44:37]

I think you're right. Updated the comment.

     CONNECTION_ETHERNET = 1,
     CONNECTION_WIFI = 2,
     CONNECTION_2G = 3,
     CONNECTION_3G = 4,
     CONNECTION_4G = 5,
-    CONNECTION_NONE = 6     // No connection.
+    CONNECTION_NONE = 6,    // No connection.
+    CONNECTION_LAST = CONNECTION_NONE
   };
 
   class NET_EXPORT IPAddressObserver {
    public:
     // Will be called when the IP address of the primary interface changes.
     // This includes when the primary interface itself changes.
     virtual void OnIPAddressChanged() = 0;
 
    protected:
     IPAddressObserver() {}
@@ skipping 268 matching lines @@
 
   // Computes NetworkChange signal from IPAddress and ConnectionType signals.
   scoped_ptr<NetworkChangeCalculator> network_change_calculator_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkChangeNotifier);
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_NETWORK_CHANGE_NOTIFIER_H_