bluetooth: Call error callback when characteristics get destroyed during a GATT Event (mac)

device/bluetooth/bluetooth_remote_gatt_characteristic_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/bluetooth_remote_gatt_characteristic_mac.h"
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/threading/thread_task_runner_handle.h"
@@ skipping 62 matching lines @@
       characteristic_value_read_or_write_in_progress_(false),
       start_notifications_in_progress_(false),
       weak_ptr_factory_(this) {
   uuid_ = BluetoothAdapterMac::BluetoothUUIDWithCBUUID(
       [cb_characteristic_.get() UUID]);
   identifier_ = base::SysNSStringToUTF8(
       [NSString stringWithFormat:@"%s-%p", uuid_.canonical_value().c_str(),
                                  (void*)cb_characteristic_]);
 }
 
-BluetoothRemoteGattCharacteristicMac::~BluetoothRemoteGattCharacteristicMac() {}
+BluetoothRemoteGattCharacteristicMac::~BluetoothRemoteGattCharacteristicMac() {
+  if (!read_characteristic_value_callbacks_.first.is_null()) {
+    std::pair<ValueCallback, ErrorCallback> callbacks;
+    callbacks.swap(read_characteristic_value_callbacks_);
+    callbacks.second.Run(BluetoothGattService::GATT_ERROR_FAILED);
+  }
+  if (!write_characteristic_value_callbacks_.first.is_null()) {
+    std::pair<base::Closure, ErrorCallback> callbacks;
+    callbacks.swap(write_characteristic_value_callbacks_);
+    callbacks.second.Run(BluetoothGattService::GATT_ERROR_FAILED);
+  }
+}
 
 std::string BluetoothRemoteGattCharacteristicMac::GetIdentifier() const {
   return identifier_;
 }
 
 BluetoothUUID BluetoothRemoteGattCharacteristicMac::GetUUID() const {
   return uuid_;
 }
 
 BluetoothGattCharacteristic::Properties
@@ skipping 263 matching lines @@
   return (GetProperties() & BluetoothGattCharacteristic::PROPERTY_WRITE)
              ? CBCharacteristicWriteWithResponse
              : CBCharacteristicWriteWithoutResponse;
 }
 
 CBCharacteristic* BluetoothRemoteGattCharacteristicMac::GetCBCharacteristic()
     const {
   return cb_characteristic_.get();
 }
 }  // namespace device.