device/bluetooth: Add abstract API definition for BluetoothGattDescriptor.

device/bluetooth/bluetooth.gyp

 # Copyright 2013 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 23 matching lines @@
         'bluetooth_device.cc',
         'bluetooth_device.h',
         'bluetooth_device_chromeos.cc',
         'bluetooth_device_chromeos.h',
         'bluetooth_device_mac.h',
         'bluetooth_device_mac.mm',
         'bluetooth_device_win.cc',
         'bluetooth_device_win.h',
         'bluetooth_gatt_characteristic.cc',
         'bluetooth_gatt_characteristic.h',
+        'bluetooth_gatt_descriptor.cc',
+        'bluetooth_gatt_descriptor.h',
         'bluetooth_gatt_service.cc',
         'bluetooth_gatt_service.h',
         'bluetooth_init_win.cc',
         'bluetooth_init_win.h',
         'bluetooth_out_of_band_pairing_data.h',
         'bluetooth_profile.cc',
         'bluetooth_profile.h',
         'bluetooth_profile_chromeos.cc',
         'bluetooth_profile_chromeos.h',
         'bluetooth_profile_mac.h',
@@ skipping 64 matching lines @@
         'test/mock_bluetooth_device.cc',
         'test/mock_bluetooth_device.h',
         'test/mock_bluetooth_profile.cc',
         'test/mock_bluetooth_profile.h',
         'test/mock_bluetooth_socket.cc',
         'test/mock_bluetooth_socket.h',
       ],
     },
   ],
 }