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diff --git a/chromeos/dbus/dbus_client.h b/chromeos/dbus/dbus_client.h
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+++ b/chromeos/dbus/dbus_client.h
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+// Copyright 2013 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 CHROMEOS_DBUS_DBUS_CLIENT_H_
+#define CHROMEOS_DBUS_DBUS_CLIENT_H_
+
+namespace dbus {
+class Bus;
+};
+
+namespace chromeos {
+
+// Interface for all DBus clients handled by DBusThreadManager. It restricts
+// access to the Init function to DBusThreadManagerImpl only to prevent
+// incorrect calls. Stub clients may lift that restriction however.
+class DBusClient {
+ protected:
+  friend class DBusThreadManagerImpl;
+
+  virtual ~DBusClient() {}
+
+  // This function is called by DBusThreadManager. Only in unit tests, which
+  // don't use DBusThreadManager, this function can be called through Stub
+  // implementations (they change Init's member visibility to public).
+  virtual void Init(dbus::Bus* bus) = 0;
+
+ private:
+  DISALLOW_ASSIGN(DBusClient);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROMEOS_DBUS_DBUS_CLIENT_H_