Implemented BluetoothTaskManagerWin class.

device/bluetooth/bluetooth_polling_thread_win.h

+// Copyright (c) 2012 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_BLUETOOTH_POLLING_THREAD_WIN_H_
+#define DEVICE_BLUETOOTH_BLUETOOTH_POLLING_THREAD_WIN_H_
+
+#include "base/synchronization/cancellation_flag.h"
+#include "base/threading/thread.h"
+
+namespace device {
+
+class BluetoothTaskManagerWin;
+
+// A thread dedicated to perform blocking bluetooth APIs on Windows.
+// Other than constructor, destructor, StartPolling(), and Cancel(), all else in
+// this class should run on its own thread.
+// The constructor, destructor, StartPolling(), and Cancel() MUST be run from
+// the |task_manager_|'s message loop.
+class BluetoothPollingThreadWin : public base::Thread {
+ public:
+  BluetoothPollingThreadWin(BluetoothTaskManagerWin* task_manager);
+  virtual ~BluetoothPollingThreadWin();
+
+  void StartPolling();
+  void Cancel();
+
+ private:
+  friend class BluetoothTaskManagerWin;
+
+  // Called periodically to get the latest state of the Bluetooth Adapter from
+  // the Windows APIs. Posts another call to PollAdapter unless
+  // |cancellation_flag_| is set.
+  void PollAdapter();
+
+  static const int kPollIntervalMs;
+
+  // The task manager owning this thread. It is guaranteed to outlive this
+  // object.
+  BluetoothTaskManagerWin* task_manager_;
+
+  base::CancellationFlag cancellation_flag_;
+
+  DISALLOW_COPY_AND_ASSIGN(BluetoothPollingThreadWin);
+};
+
+}  // namespace device
+
+#endif  // DEVICE_BLUETOOTH_BLUETOOTH_POLLING_THREAD_WIN_H_