Read characteristic implementation on macOS

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 13 matching lines @@
   }
 
   void DidDiscoverPrimaryServices(NSError* error) {
     device_mac_->DidDiscoverPrimaryServices(error);
   };
 
   void DidDiscoverCharacteristics(CBService* service, NSError* error) {
     device_mac_->DidDiscoverCharacteristics(service, error);
   };
 
+  void DidUpdateValue(CBCharacteristic* characteristic, NSError* error) {
+    device_mac_->DidUpdateValue(characteristic, error);
+  }
+
   CBPeripheral* GetPeripheral() { return device_mac_->GetPeripheral(); }
 
  private:
   BluetoothLowEnergyDeviceMac* device_mac_;
 };
 
 }  // namespace device
 
 @implementation BluetoothLowEnergyPeripheralDelegate
 
@@ skipping 19 matching lines @@
     didDiscoverServices:(NSError*)error {
   bridge_->DidDiscoverPrimaryServices(error);
 }
 
 - (void)peripheral:(CBPeripheral*)peripheral
     didDiscoverCharacteristicsForService:(CBService*)service
                                    error:(NSError*)error {
   bridge_->DidDiscoverCharacteristics(service, error);
 }
 
+- (void)peripheral:(CBPeripheral*)peripheral
+    didUpdateValueForCharacteristic:(CBCharacteristic*)characteristic
+                              error:(NSError*)error {
+  bridge_->DidUpdateValue(characteristic, error);
+}
+
 @end