Helper functions in NetworkChangeNotifier related to WWAN use

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 "net/base/net_export.h"
@@ skipping 112 matching lines @@
 #endif
 
   // Convenience method to determine if the user is offline.
   // Returns true if there is currently no internet connection.
   //
   // A return value of |true| is a pretty strong indicator that the user
   // won't be able to connect to remote sites. However, a return value of
   // |false| is inconclusive; even if some link is up, it is uncertain
   // whether a particular connection attempt to a particular remote site
   // will be successfully.
-  static bool IsOffline() {
-    return GetConnectionType() == CONNECTION_NONE;
-  }
+  static bool IsOffline();
+
+  // Returns true if the current connection type uses WWAN.

[pauljensen, 2012/10/12 14:01:15]

I'd prefer "Celluar" to "WWAN" as its more common terminology (262M versus 6M
Google.com hits).

+  static bool IsOverWWAN();

[pauljensen, 2012/10/12 14:01:15]

Slight preference to "IsOn" or "IsUsing" over "IsOver" just because "On" and
"Using" IMHO imply online to a greater degree than "Over".  Communication on my
cell phone could be over cellular but that doesn't mean its actively using the
connection.

+
+  // Returns true if |type| uses WWAN.
+  static bool IsOverWWAN(ConnectionType type);
 
   // Like Create(), but for use in tests.  The mock object doesn't monitor any
   // events, it merely rebroadcasts notifications when requested.
   static NetworkChangeNotifier* CreateMock();
 
   // Registers |observer| to receive notifications of network changes.  The
   // thread on which this is called is the thread on which |observer| will be
   // called back with notifications.  This is safe to call if Create() has not
   // been called (as long as it doesn't race the Create() call on another
   // thread), in which case it will simply do nothing.
@@ skipping 83 matching lines @@
 
   // A little-piggy-back observer that simply logs UMA histogram data.
   scoped_ptr<HistogramWatcher> histogram_watcher_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkChangeNotifier);
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_NETWORK_CHANGE_NOTIFIER_H_