Implement Bus and ObjectProxy classes for our D-Bus library.

dbus/scoped_dbus_error.h

Index: dbus/scoped_dbus_error.h
diff --git a/dbus/scoped_dbus_error.h b/dbus/scoped_dbus_error.h
new file mode 100644
index 0000000000000000000000000000000000000000..e76e4f722b5bf603210a3449456377117970a4f7
--- /dev/null
+++ b/dbus/scoped_dbus_error.h
@@ -0,0 +1,34 @@
+// Copyright (c) 2011 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 DBUS_SCOPED_DBUS_ERROR_H_
+#define DBUS_SCOPED_DBUS_ERROR_H_
+#pragma once
+
+#include <dbus/dbus.h>
+
+namespace dbus {
+
+// Utility class to ensure that DBusError is freed.
+class ScopedDBusError {
+ public:
+  ScopedDBusError() {
+    dbus_error_init(&error_);
+  }
+
+  ~ScopedDBusError() {
+    dbus_error_free(&error_);
+  }
+
+  DBusError* get() { return &error_; }
+  bool is_set() { return dbus_error_is_set(&error_); }
+  const char* message() { return error_.message; }
+
+ private:
+  DBusError error_;
+};
+
+}  // namespace dbus
+
+#endif  // DBUS_SCOPED_DBUS_ERROR_H_