Adding the last test related with connect/disconnect

device/bluetooth/bluetooth_low_energy_device_mac.mm

Index: device/bluetooth/bluetooth_low_energy_device_mac.mm
diff --git a/device/bluetooth/bluetooth_low_energy_device_mac.mm b/device/bluetooth/bluetooth_low_energy_device_mac.mm
index d0f3f3dc29d2d5f464cfe057d9d28d44204f4e79..3e29b43d261dc931a8e5a3f26bba0896abe30d8b 100644
--- a/device/bluetooth/bluetooth_low_energy_device_mac.mm
+++ b/device/bluetooth/bluetooth_low_energy_device_mac.mm
@@ -269,10 +269,12 @@ CBPeripheral* BluetoothLowEnergyDeviceMac::GetPeripheral() {
   return peripheral_;
 }
 
-void BluetoothLowEnergyDeviceMac::DidDisconnectPeripheral() {
+void BluetoothLowEnergyDeviceMac::DidDisconnectPeripheral(
+    BluetoothDevice::ConnectErrorCode error_code) {
   if (create_gatt_connection_error_callbacks_.empty()) {
+    // TODO(http://crbug.com/585897): Need to pass the error.
     DidDisconnectGatt();
   } else {
-    DidFailToConnectGatt(ERROR_FAILED);
+    DidFailToConnectGatt(error_code);
   }
 }