mash: Allow a subset of D-Bus clients to be created in DBusThreadManager

ash/common/dbus_thread_manager_ash.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 ASH_COMMON_DBUS_THREAD_MANAGER_ASH_H_
+#define ASH_COMMON_DBUS_THREAD_MANAGER_ASH_H_
+
+#include "ash/ash_export.h"
+#include "base/macros.h"
+
+namespace chromeos {
+class PowerManagerClient;
+class SessionManagerClient;
+class SystemClockClient;
+}
+
+namespace ash {
+
+//JAMES DBusClientBundleAsh?
+class ASH_EXPORT DBusThreadManagerAsh {
+ public:
+  static DBusThreadManagerAsh* Get();
+
+  //JAMES external ownership? or traditional singleton like DBusThreadManager?
+  DBusThreadManagerAsh();
+  ~DBusThreadManagerAsh();
+
+  // D-Bus clients available to ash.
+  chromeos::PowerManagerClient* GetPowerManagerClient();
+  chromeos::SessionManagerClient* GetSessionManagerClient();
+  chromeos::SystemClockClient* GetSystemClockClient();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(DBusThreadManagerAsh);
+};
+
+}  // namespace ash
+
+#endif  // ASH_COMMON_DBUS_THREAD_MANAGER_ASH_H_