Bluetooth: mac: Working on macOS descriptor implementation.

device/bluetooth/bluetooth_low_energy_device_mac.h

Index: device/bluetooth/bluetooth_low_energy_device_mac.h
diff --git a/device/bluetooth/bluetooth_low_energy_device_mac.h b/device/bluetooth/bluetooth_low_energy_device_mac.h
index 76b31306cecde853deadc863d08ec9910e1069c5..e33d5398ea023a8d1d06ab9781f6b24c03fe6042 100644
--- a/device/bluetooth/bluetooth_low_energy_device_mac.h
+++ b/device/bluetooth/bluetooth_low_energy_device_mac.h
@@ -89,6 +89,7 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothLowEnergyDeviceMac
   void DidWriteValue(CBCharacteristic* characteristic, NSError* error);
   void DidUpdateNotificationState(CBCharacteristic* characteristic,
                                   NSError* error);
+  void DidDiscoverDescriptors(CBCharacteristic* characteristic, NSError* error);
 
   static std::string GetPeripheralIdentifier(CBPeripheral* peripheral);
 
@@ -106,6 +107,9 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothLowEnergyDeviceMac
   friend class BluetoothTestMac;
   friend class BluetoothRemoteGattServiceMac;
 
+  // Sends notification if this device is ready with all services discovered.
+  void SendNotificationIfDiscoveryComplete();
+
   // Returns the Bluetooth adapter.
   BluetoothAdapterMac* GetMacAdapter();