Read characteristic implementation on macOS

device/bluetooth/test/mock_bluetooth_cbperipheral_mac.mm

 // Copyright 2015 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_cbperipheral_mac.h"
 
 #include "base/mac/foundation_util.h"
 #include "base/mac/scoped_nsobject.h"
 #include "device/bluetooth/test/bluetooth_test_mac.h"
 #include "device/bluetooth/test/mock_bluetooth_cbservice_mac.h"
@@ skipping 73 matching lines @@
   if (_bluetoothTestMac) {
     _bluetoothTestMac->OnFakeBluetoothServiceDiscovery();
   }
   [_delegate peripheral:self.peripheral didDiscoverServices:nil];
 }
 
 - (void)discoverCharacteristics:(NSArray*)characteristics
                      forService:(CBService*)service {
 }
 
+- (void)readValueForCharacteristic:(CBCharacteristic*)characteristic {
+  DCHECK(_bluetoothTestMac);
+  _bluetoothTestMac->OnFakeBluetoothCharacteristicReadValue();
+}
+
 - (void)removeAllServices {
   [_services.get() removeAllObjects];
 }
 
 - (void)addServices:(NSArray*)services {
   if (!_services.get()) {
     _services.reset([[NSMutableArray alloc] init]);
   }
   for (CBUUID* uuid in services) {
     base::scoped_nsobject<MockCBService> service([[MockCBService alloc]
@@ skipping 46 matching lines @@
 
 - (NSArray*)services {
   return _services.get();
 }
 
 - (CBPeripheral*)peripheral {
   return ObjCCast<CBPeripheral>(self);
 }
 
 @end