bluetooth: macOS: Adding log in BluetoothAdapterMac::DisconnectGatt()

device/bluetooth/bluetooth_adapter_mac.mm

Index: device/bluetooth/bluetooth_adapter_mac.mm
diff --git a/device/bluetooth/bluetooth_adapter_mac.mm b/device/bluetooth/bluetooth_adapter_mac.mm
index 7ecac69a5de80fbd65ff1be6ca84927c90c777ff..61f664095eea64126734bc91cbd2ee2d3458540d 100644
--- a/device/bluetooth/bluetooth_adapter_mac.mm
+++ b/device/bluetooth/bluetooth_adapter_mac.mm
@@ -641,12 +641,14 @@ BluetoothAdapterMac::RetrieveGattConnectedDevicesWithService(
 
 void BluetoothAdapterMac::CreateGattConnection(
     BluetoothLowEnergyDeviceMac* device_mac) {
+  VLOG(1) << *device_mac << ": Create gatt connection.";
   [low_energy_central_manager_ connectPeripheral:device_mac->peripheral_
                                          options:nil];
 }
 
 void BluetoothAdapterMac::DisconnectGatt(
     BluetoothLowEnergyDeviceMac* device_mac) {
+  VLOG(1) << *device_mac << ": Disconnect gatt.";
   [low_energy_central_manager_
       cancelPeripheralConnection:device_mac->peripheral_];
 }