Implement BluetoothGattNotifySession::Stop on Android, 2nd attempt

device/bluetooth/bluez/bluetooth_gatt_notify_session_bluez.h

-// 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.
-
-#ifndef DEVICE_BLUETOOTH_BLUEZ_BLUETOOTH_GATT_NOTIFY_SESSION_BLUEZ_H_
-#define DEVICE_BLUETOOTH_BLUEZ_BLUETOOTH_GATT_NOTIFY_SESSION_BLUEZ_H_
-
-#include <string>
-
-#include "base/callback.h"
-#include "base/macros.h"
-#include "device/bluetooth/bluetooth_gatt_notify_session.h"
-#include "device/bluetooth/dbus/bluetooth_gatt_characteristic_client.h"
-
-namespace device {
-
-class BluetoothAdapter;
-
-}  // namespace device
-
-namespace bluez {
-
-class BluetoothRemoteGattCharacteristicBlueZ;
-
-// BluetoothGattNotifySessionBlueZ implements
-// BluetoothGattNotifySession for platforms that use BlueZ.
-class BluetoothGattNotifySessionBlueZ
-    : public device::BluetoothGattNotifySession,
-      public bluez::BluetoothGattCharacteristicClient::Observer {
- public:
-  ~BluetoothGattNotifySessionBlueZ() override;
-
-  // BluetoothGattNotifySession overrides.
-  std::string GetCharacteristicIdentifier() const override;
-  bool IsActive() override;
-  void Stop(const base::Closure& callback) override;
-
- private:
-  friend class BluetoothRemoteGattCharacteristicBlueZ;
-
-  explicit BluetoothGattNotifySessionBlueZ(
-      scoped_refptr<device::BluetoothAdapter> adapter,
-      const std::string& device_address,
-      const std::string& service_identifier,
-      const std::string& characteristic_identifier,
-      const dbus::ObjectPath& characteristic_path);
-
-  // bluez::BluetoothGattCharacteristicClient::Observer overrides.
-  void GattCharacteristicRemoved(const dbus::ObjectPath& object_path) override;
-  void GattCharacteristicPropertyChanged(
-      const dbus::ObjectPath& object_path,
-      const std::string& property_name) override;
-
-  // True, if this session is currently active.
-  bool active_;
-
-  // The Bluetooth adapter that this session is associated with.
-  scoped_refptr<device::BluetoothAdapter> adapter_;
-
-  // The Bluetooth address of the device hosting the characteristic.
-  std::string device_address_;
-
-  // The GATT service that the characteristic belongs to.
-  std::string service_id_;
-
-  // Identifier of the associated characteristic.
-  std::string characteristic_id_;
-
-  // D-Bus object path of the associated characteristic. This is used to filter
-  // observer events.
-  dbus::ObjectPath object_path_;
-
-  DISALLOW_COPY_AND_ASSIGN(BluetoothGattNotifySessionBlueZ);
-};
-
-}  // namespace bluez
-
-#endif  //  DEVICE_BLUETOOTH_BLUEZ_BLUETOOTH_GATT_NOTIFY_SESSION_BLUEZ_H_