Reland "Add Linux support for the Bluetooth API"

device/bluetooth/dbus/dbus_thread_manager_linux.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_DBUS_DBUS_THREAD_MANAGER_LINUX_H_
+#define DEVICE_BLUETOOTH_DBUS_DBUS_THREAD_MANAGER_LINUX_H_
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "device/bluetooth/bluetooth_export.h"
+
+namespace base {
+class Thread;
+}  // namespace base
+
+namespace dbus {
+class Bus;
+}  // namespace dbus
+
+namespace bluez {
+
+// LinuxDBusManager manages the D-Bus thread, the thread dedicated to
+// handling asynchronous D-Bus operations.
+class DEVICE_BLUETOOTH_EXPORT DBusThreadManagerLinux {
+ public:
+  // Sets the global instance. Must be called before any calls to Get().
+  // We explicitly initialize and shut down the global object, rather than
+  // making it a Singleton, to ensure clean startup and shutdown.
+  static void Initialize();
+
+  // Destroys the global instance.
+  static void Shutdown();
+
+  // Gets the global instance. Initialize() must be called first.
+  static DBusThreadManagerLinux* Get();
+
+  // Returns various D-Bus bus instances, owned by LinuxDBusManager.
+  dbus::Bus* GetSystemBus();
+
+ private:
+  explicit DBusThreadManagerLinux();
+  ~DBusThreadManagerLinux();
+
+  // Creates a global instance of LinuxDBusManager with the real
+  // implementations for all clients that are listed in |unstub_client_mask| and
+  // stub implementations for all clients that are not included. Cannot be
+  // called more than once.
+  static void CreateGlobalInstance();
+
+  scoped_ptr<base::Thread> dbus_thread_;
+  scoped_refptr<dbus::Bus> system_bus_;
+
+  DISALLOW_COPY_AND_ASSIGN(DBusThreadManagerLinux);
+};
+
+}  // namespace bluez
+
+#endif  // DEVICE_BLUETOOTH_DBUS_DBUS_THREAD_MANAGER_LINUX_H_