log wifi actions from settings

To start:
  enable
  disable
  forget
  connect
  add

Depends-On: I60163e44602b8e23b643b9103c324fa0e0d2c4c4
Change-Id: I52f40298db63f410ced2dbf5ba05d3ad098a85a2

src/com/android/settings/wifi/WifiEnabler.java

@@ -30,6 +30,7 @@ import android.provider.Settings;
 import android.widget.Switch;
 import android.widget.Toast;
 
+import com.android.internal.logging.MetricsLogger;
 import com.android.settings.R;
 import com.android.settings.search.Index;
 import com.android.settings.widget.SwitchBar;
@@ -209,7 +210,8 @@ public class WifiEnabler implements SwitchBar.OnSwitchChangeListener  {
                 (wifiApState == WifiManager.WIFI_AP_STATE_ENABLED))) {
             mWifiManager.setWifiApEnabled(null, false);
         }
-
+        MetricsLogger.action(mContext,
+                isChecked ? MetricsLogger.ACTION_WIFI_ON : MetricsLogger.ACTION_WIFI_OFF);
         if (!mWifiManager.setWifiEnabled(isChecked)) {
             // Error
             mSwitchBar.setEnabled(true);