Implement BluetoothRemoteGattCharacteristicWin::StartNotifySession and related unit tests

device/bluetooth/bluetooth_gatt_notify_session_win.cc

+// 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_gatt_notify_session_win.h"
+
+#include "base/location.h"
+#include "base/thread_task_runner_handle.h"
+
+namespace device {
+BluetoothGattNotifySessionWin::BluetoothGattNotifySessionWin(
+    base::WeakPtr<BluetoothRemoteGattCharacteristicWin> characteristic)
+    : is_active_(true), characteristic_(characteristic) {}
+
+BluetoothGattNotifySessionWin::~BluetoothGattNotifySessionWin() {
+  if (characteristic_.get() != nullptr && is_active_)
+    characteristic_.get()->StopNotifySession();
+}
+
+std::string BluetoothGattNotifySessionWin::GetCharacteristicIdentifier() const {
+  if (characteristic_.get() != nullptr)
+    return characteristic_.get()->GetIdentifier();
+  return std::string();
+}
+
+bool BluetoothGattNotifySessionWin::IsActive() {
+  return is_active_ && characteristic_.get() != nullptr;
+}
+
+void BluetoothGattNotifySessionWin::Stop(const base::Closure& callback) {
+  if (characteristic_.get() != nullptr && is_active_)
+    characteristic_.get()->StopNotifySession();
+  is_active_ = false;
+  base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE, callback);
+}
+
+}  // namespace device