bluetooth: macOS: Support for extra didConnectPeripheral event from macOS.

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 e2823d16eded4be599c5ab404dc5cc1d93a166ba..24b0b7f5972cb674154fad73167b7baa79721528 100644
--- a/device/bluetooth/bluetooth_low_energy_device_mac.h
+++ b/device/bluetooth/bluetooth_low_energy_device_mac.h
@@ -81,6 +81,7 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothLowEnergyDeviceMac
   // BluetoothDevice override.
   void CreateGattConnectionImpl() override;
   void DisconnectGatt() override;
+  void DidConnectGatt() override;
 
   // Methods used by BluetoothLowEnergyPeripheralBridge.
   void DidDiscoverPrimaryServices(NSError* error);
@@ -143,6 +144,9 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothLowEnergyDeviceMac
   // Whether the device is connectable.
   bool connectable_;
 
+  // Whether the device is connected.
+  bool connected_;
+
   // The peripheral's identifier, as returned by [CBPeripheral identifier].
   std::string identifier_;