[net] Add WifiPhyMode to SystemProfile

net/base/net_util.h

Index: net/base/net_util.h
diff --git a/net/base/net_util.h b/net/base/net_util.h
index f21c1edb16ce2404f471adf3f1e5d951b1c8d221..4b4057a3d90802d10a338b8fd7b15fbd60c88b62 100644
--- a/net/base/net_util.h
+++ b/net/base/net_util.h
@@ -516,6 +516,28 @@ typedef std::vector<NetworkInterface> NetworkInterfaceList;
 // Can be called only on a thread that allows IO.
 NET_EXPORT bool GetNetworkList(NetworkInterfaceList* networks);
 
+// General category of the IEEE 802.11 (wifi) physical layer operating mode.
+enum WifiPhyMode {
+  // No wifi support or no associated AP.
+  WIFI_PHY_MODE_NONE,
+  // An obsolete modes introduced by the original 802.11, e.g. IR, FHSS,
+  WIFI_PHY_MODE_ANCIENT,
+  // 802.11a, OFDM-based rates.
+  WIFI_PHY_MODE_A,
+  // 802.11b, DSSS or HR DSSS.
+  WIFI_PHY_MODE_B,
+  // 802.11g, same rates as 802.11a but compatible with 802.11b.
+  WIFI_PHY_MODE_G,
+  // 802.11n, HT rates.
+  WIFI_PHY_MODE_N,
+  // Unclassified mode or failure to identify.
+  WIFI_PHY_MODE_UNKNOWN
+};
+
+// Characterize the PHY mode of the currently associated access point.
+// Currently only available on OS_WIN.
+NET_EXPORT WifiPhyMode GetWifiPhyMode();
+
 }  // namespace net
 
 #endif  // NET_BASE_NET_UTIL_H_