chrome.bluetooth API improvements.

device/bluetooth/bluetooth_socket_thread_win.h

+// Copyright 2014 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_SOCKET_THREAD_WIN_H_
+#define DEVICE_BLUETOOTH_BLUETOOTH_SOCKET_THREAD_WIN_H_
+
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/threading/thread_checker.h"
+
+namespace base {
+class SequencedTaskRunner;
+class Thread;
+}  // namespace base
+
+namespace device {
+
+// Thread abstraction used by |BluetoothSocketWWin| to perform IO operations on
+// the underlying platform sockets. An instance of this class can be shared by
+// many active sockets.
+class BluetoothSocketThreadWin
+    : public base::RefCountedThreadSafe<BluetoothSocketThreadWin> {
+ public:
+  static scoped_refptr<BluetoothSocketThreadWin> Get();
+  void OnSocketActivate();
+  void OnSocketDeactivate();
+
+  scoped_refptr<base::SequencedTaskRunner> task_runner() const;
+
+ private:
+  friend class base::RefCountedThreadSafe<BluetoothSocketThreadWin>;
+  BluetoothSocketThreadWin();
+  virtual ~BluetoothSocketThreadWin();
+
+  void EnsureStarted();
+
+  base::ThreadChecker thread_checker_;
+  int active_socket_count_;
+  scoped_ptr<base::Thread> thread_;
+  scoped_refptr<base::SequencedTaskRunner> task_runner_;
+
+  DISALLOW_COPY_AND_ASSIGN(BluetoothSocketThreadWin);
+};
+
+}  // namespace device
+
+#endif  // DEVICE_BLUETOOTH_BLUETOOTH_SOCKET_THREAD_WIN_H_