Bluetooth: mac: Working on macOS descriptor implementation.

device/bluetooth/bluetooth_low_energy_peripheral_delegate.mm

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "device/bluetooth/bluetooth_low_energy_peripheral_delegate.h"
 
 #include "device/bluetooth/bluetooth_adapter_mac.h"
 #include "device/bluetooth/bluetooth_low_energy_discovery_manager_mac.h"
 
 namespace device {
@@ skipping 26 matching lines @@
 
   void DidWriteValue(CBCharacteristic* characteristic, NSError* error) {
     device_mac_->DidWriteValue(characteristic, error);
   }
 
   void DidUpdateNotificationState(CBCharacteristic* characteristic,
                                   NSError* error) {
     device_mac_->DidUpdateNotificationState(characteristic, error);
   }
 
+  void DidDiscoverDescriptors(CBCharacteristic* characteristic,
+                              NSError* error) {
+    device_mac_->DidDiscoverDescriptors(characteristic, error);
+  }
+
   CBPeripheral* GetPeripheral() { return device_mac_->GetPeripheral(); }
 
  private:
   BluetoothLowEnergyDeviceMac* device_mac_;
 };
 
 }  // namespace device
 
 @implementation BluetoothLowEnergyPeripheralDelegate
 
@@ skipping 37 matching lines @@
                              error:(nullable NSError*)error {
   bridge_->DidWriteValue(characteristic, error);
 }
 
 - (void)peripheral:(CBPeripheral*)peripheral
     didUpdateNotificationStateForCharacteristic:
         (nonnull CBCharacteristic*)characteristic
                                           error:(nullable NSError*)error {
   bridge_->DidUpdateNotificationState(characteristic, error);
 }
+
+- (void)peripheral:(CBPeripheral*)peripheral
+    didDiscoverDescriptorsForCharacteristic:(CBCharacteristic*)characteristic
+                                      error:(nullable NSError*)error {
+  bridge_->DidDiscoverDescriptors(characteristic, error);
+}
+
 @end