Determine connection type in NetworkChangeNotifierLinux.

net/base/network_change_notifier.h

Index: net/base/network_change_notifier.h
diff --git a/net/base/network_change_notifier.h b/net/base/network_change_notifier.h
index 73842d4bd5f66a5475625595d3a4c84d8c8634d8..964fcf3c4b9a3a050a8030fe65da8bd0b4b0a304 100644
--- a/net/base/network_change_notifier.h
+++ b/net/base/network_change_notifier.h
@@ -5,6 +5,8 @@
 #ifndef NET_BASE_NETWORK_CHANGE_NOTIFIER_H_
 #define NET_BASE_NETWORK_CHANGE_NOTIFIER_H_
 
+#include <vector>
+
 #include "base/basictypes.h"
 #include "base/observer_list_threadsafe.h"
 #include "base/time/time.h"
@@ -17,6 +19,8 @@ namespace net {
 struct DnsConfig;
 class HistogramWatcher;
 class NetworkChangeNotifierFactory;
+struct NetworkInterface;
+typedef std::vector<NetworkInterface> NetworkInterfaceList;
 class URLRequest;
 
 #if defined(OS_LINUX)
@@ -258,6 +262,13 @@ class NET_EXPORT NetworkChangeNotifier {
   // current connection is cellular.
   static bool IsConnectionCellular(ConnectionType type);
 
+  // Gets the current connection type based on |interfaces|. Returns
+  // CONNECTION_NONE if there are no interfaces, CONNECTION_UNKNOWN if two
+  // interfaces have different connection types or the connection type of all
+  // interfaces if they have the same interface type.
+  static ConnectionType ConnectionTypeFromInterfaceList(
+      const NetworkInterfaceList& interfaces);
+
   // Like Create(), but for use in tests.  The mock object doesn't monitor any
   // events, it merely rebroadcasts notifications when requested.
   static NetworkChangeNotifier* CreateMock();