device/bluetooth: Improvements to GATT descriptor access API.

device/bluetooth/bluetooth_remote_gatt_characteristic_chromeos.h

 // Copyright 2014 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.
 
 #ifndef DEVICE_BLUETOOTH_BLUETOOTH_REMOTE_GATT_CHARACTERISTIC_CHROMEOS_H_
 #define DEVICE_BLUETOOTH_BLUETOOTH_REMOTE_GATT_CHARACTERISTIC_CHROMEOS_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 26 matching lines @@
   // device::BluetoothGattCharacteristic overrides.
   virtual std::string GetIdentifier() const OVERRIDE;
   virtual device::BluetoothUUID GetUUID() const OVERRIDE;
   virtual bool IsLocal() const OVERRIDE;
   virtual const std::vector<uint8>& GetValue() const OVERRIDE;
   virtual device::BluetoothGattService* GetService() const OVERRIDE;
   virtual Properties GetProperties() const OVERRIDE;
   virtual Permissions GetPermissions() const OVERRIDE;
   virtual std::vector<device::BluetoothGattDescriptor*>
       GetDescriptors() const OVERRIDE;
+  virtual device::BluetoothGattDescriptor* GetDescriptor(
+      const std::string& identifier) const OVERRIDE;
   virtual bool AddDescriptor(
       device::BluetoothGattDescriptor* descriptor) OVERRIDE;
   virtual bool UpdateValue(const std::vector<uint8>& value) OVERRIDE;
   virtual void ReadRemoteCharacteristic(
       const ValueCallback& callback,
       const ErrorCallback& error_callback) OVERRIDE;
   virtual void WriteRemoteCharacteristic(
       const std::vector<uint8>& new_value,
       const base::Closure& callback,
       const ErrorCallback& error_callback) OVERRIDE;
@@ skipping 48 matching lines @@
   // invalidate its weak pointers before any other members are destroyed.
   base::WeakPtrFactory<BluetoothRemoteGattCharacteristicChromeOS>
       weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BluetoothRemoteGattCharacteristicChromeOS);
 };
 
 }  // namespace chromeos
 
 #endif  // DEVICE_BLUETOOTH_BLUETOOTH_REMOTE_GATT_CHARACTERISTIC_CHROMEOS_H_