Add SSID getter to WiFiService

components/wifi/wifi_service_win.cc

 // 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.
 
 #include "components/wifi/wifi_service.h"
 
 #include <iphlpapi.h>
 #include <objbase.h>
 #include <wlanapi.h>
 
@@ skipping 208 matching lines @@
                                 std::string* key_data,
                                 std::string* error) override;
 
   virtual void SetEventObservers(
       scoped_refptr<base::MessageLoopProxy> message_loop_proxy,
       const NetworkGuidListCallback& networks_changed_observer,
       const NetworkGuidListCallback& network_list_changed_observer) override;
 
   virtual void RequestConnectedNetworkUpdate() override {}
 
+  virtual void GetConnectedNetworkSSID(std::string* ssid,
+                                       std::string* error) override;
+
  private:
   typedef int32 EncryptionType;
   enum EncryptionTypeEnum {
     kEncryptionTypeAny = 0,
     kEncryptionTypeAES = 1,
     kEncryptionTypeTKIP = 2
   };
 
   // Static callback for Windows WLAN_NOTIFICATION. Calls OnWlanNotification
   // on WiFiServiceImpl passed back as |context|.
@@ skipping 560 matching lines @@
     WlanRegisterNotification_function_(client_,
                                        WLAN_NOTIFICATION_SOURCE_ALL,
                                        FALSE,
                                        OnWlanNotificationCallback,
                                        this,
                                        NULL,
                                        NULL);
   }
 }
 
+void WiFiServiceImpl::GetConnectedNetworkSSID(std::string* ssid,
+                                              std::string* error) {
+  DWORD error_code = EnsureInitialized();
+  if (CheckError(error_code, kErrorWiFiService, error))
+    return;
+  NetworkProperties connected_properties;
+  error_code = GetCurrentProperties(&connected_properties);

[mef, 2015/01/30 17:45:41]

GetCurrentProperties may be a little overkill for this as it also gets list of
network's BSS using WlanGetNetworkBssList. 
I don't think it should cause any issues, but I would double-check that.

[meacer, 2015/01/30 19:11:50]

Added a lightweight version that doesn't use the BSS list: GetCurrentSSID.
Please let me know if you prefer this.

[mef, 2015/01/30 19:45:11]

Yeah, I think this has less performance concerns.

+  if (CheckError(error_code, kErrorWiFiService, error))
+    return;
+  *ssid = connected_properties.ssid;
+}
+
 void WiFiServiceImpl::OnWlanNotificationCallback(
     PWLAN_NOTIFICATION_DATA wlan_notification_data,
     PVOID context) {
   WiFiServiceImpl* service = reinterpret_cast<WiFiServiceImpl*>(context);
   service->OnWlanNotification(wlan_notification_data);
 }
 
 void WiFiServiceImpl::OnWlanNotification(
     PWLAN_NOTIFICATION_DATA wlan_notification_data) {
   if (message_loop_proxy_.get() == NULL)
@@ skipping 1021 matching lines @@
     NetworkGuidList changed_networks(1, network_guid);
     message_loop_proxy_->PostTask(
         FROM_HERE,
         base::Bind(networks_changed_observer_, changed_networks));
   }
 }
 
 WiFiService* WiFiService::Create() { return new WiFiServiceImpl(); }
 
 }  // namespace wifi