Add SSID getter to WiFiService

components/wifi/wifi_service.h

 // Copyright 2013 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 CHROME_UTILITY_WIFI_WIFI_SERVICE_H_
 #define CHROME_UTILITY_WIFI_WIFI_SERVICE_H_
 
 #include <list>
 #include <set>
 #include <string>
@@ skipping 100 matching lines @@
   // events needs to be sent. Notifications are posted on |message_loop_proxy|.
   virtual void SetEventObservers(
       scoped_refptr<base::MessageLoopProxy> message_loop_proxy,
       const NetworkGuidListCallback& networks_changed_observer,
       const NetworkGuidListCallback& network_list_changed_observer) = 0;
 
   // Request update of Connected Network information. Send |NetworksChanged|
   // event on completion.
   virtual void RequestConnectedNetworkUpdate() = 0;
 
+  // Get the GUID of the currently connected network, if any.

[mef, 2015/01/28 22:41:39]

I think for UI presentation you should explicitly get SSID instead. Yes,
currently GUID is the same as SSID, but this is subject to change. Also,
apparently there are SSIDs that cannot be represented in utf-8
(https://code.google.com/p/chromium/issues/detail?id=432546).

pneubeck has introduced HexSSID and I'm planning to add support for that on Win
and Mac.

+  virtual void GetConnectedNetworkGUID(std::string* guid,
+                                       std::string* error) = 0;
+
  protected:
   WiFiService() {}
 
   // Error constants.
   static const char kErrorAssociateToNetwork[];
   static const char kErrorInvalidData[];
   static const char kErrorNotConfigured[];
   static const char kErrorNotConnected[];
   static const char kErrorNotFound[];
   static const char kErrorNotImplemented[];
   static const char kErrorScanForNetworksWithName[];
   static const char kErrorWiFiService[];
 
  private:
   DISALLOW_COPY_AND_ASSIGN(WiFiService);
 };
 
 }  // namespace wifi
 
 #endif  // CHROME_UTILITY_WIFI_WIFI_SERVICE_H_