Bluetooth: macOS: Implementing read/write for descriptors

device/bluetooth/test/mock_bluetooth_cbcharacteristic_mac.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/test/mock_bluetooth_cbcharacteristic_mac.h"
 
 #include "base/mac/foundation_util.h"
 #include "base/mac/scoped_nsobject.h"
 #include "device/bluetooth/bluetooth_gatt_characteristic.h"
 #include "device/bluetooth/test/mock_bluetooth_cbdescriptor_mac.h"
@@ skipping 78 matching lines @@
 }  // namespace
 }  // device
 
 @interface MockCBCharacteristic () {
   // Owner of this instance.
   CBService* _service;
   scoped_nsobject<CBUUID> _UUID;
   CBCharacteristicProperties _cb_properties;
   scoped_nsobject<NSMutableArray> _simulatedDescriptors;
   scoped_nsobject<NSArray> _descriptors;
-  scoped_nsobject<NSData> _value;
+  scoped_nsobject<NSObject> _value;
   BOOL _notifying;
 }
 @end
 
 @implementation MockCBCharacteristic
 
 - (instancetype)initWithService:(CBService*)service
                          CBUUID:(CBUUID*)uuid
                      properties:(int)properties {
   self = [super init];
@@ skipping 17 matching lines @@
 }
 
 - (BOOL)isMemberOfClass:(Class)aClass {
   if (aClass == [CBCharacteristic class] ||
       [aClass isSubclassOfClass:[CBCharacteristic class]]) {
     return YES;
   }
   return [super isKindOfClass:aClass];
 }
 
-- (void)simulateReadWithValue:(NSData*)value error:(NSError*)error {
+- (void)simulateReadWithValue:(id)value error:(NSError*)error {
   _value.reset([value copy]);
   CBPeripheral* peripheral = _service.peripheral;
   [peripheral.delegate peripheral:peripheral
       didUpdateValueForCharacteristic:self.characteristic
                                 error:error];
 }
 
 - (void)simulateWriteWithError:(NSError*)error {
   CBPeripheral* peripheral = _service.peripheral;
   [peripheral.delegate peripheral:peripheral
@@ skipping 65 matching lines @@
 }
 
 - (CBCharacteristicProperties)properties {
   return _cb_properties;
 }
 
 - (NSArray*)descriptors {
   return _descriptors;
 }
 
-- (NSData*)value {
+- (id)value {
   return _value.get();
 }
 
 - (BOOL)isNotifying {
   return _notifying;
 }
 
 @end