Adding the last test related with connect/disconnect

device/bluetooth/bluetooth_adapter_mac.h

Index: device/bluetooth/bluetooth_adapter_mac.h
diff --git a/device/bluetooth/bluetooth_adapter_mac.h b/device/bluetooth/bluetooth_adapter_mac.h
index d75cbc53e912031cb930a38893c9c7910dffa668..5da74cbd99722b7195f04c4d5589c2c37033bd93 100644
--- a/device/bluetooth/bluetooth_adapter_mac.h
+++ b/device/bluetooth/bluetooth_adapter_mac.h
@@ -18,6 +18,7 @@
 #include "base/observer_list.h"
 #include "device/bluetooth/bluetooth_adapter.h"
 #include "device/bluetooth/bluetooth_audio_sink.h"
+#include "device/bluetooth/bluetooth_device.h"
 #include "device/bluetooth/bluetooth_discovery_manager_mac.h"
 #include "device/bluetooth/bluetooth_export.h"
 #include "device/bluetooth/bluetooth_low_energy_device_mac.h"
@@ -108,6 +109,11 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothAdapterMac
   void DidFailToConnectPeripheral(CBPeripheral* peripheral, NSError* error);
   void DidDisconnectPeripheral(CBPeripheral* peripheral, NSError* error);
 
+  static NSError* GetNSErrorFromConnectErrorCode(
+      BluetoothDevice::ConnectErrorCode error_code);
+  static BluetoothDevice::ConnectErrorCode GetConnectErrorCodeFromNSError(
+      NSError* error);
+
  protected:
   // BluetoothAdapter override:
   void RemovePairingDelegateInternal(