dbus: add support for passing file descriptors

dbus/file_descriptor.cc

Index: dbus/file_descriptor.cc
diff --git a/dbus/file_descriptor.cc b/dbus/file_descriptor.cc
new file mode 100644
index 0000000000000000000000000000000000000000..661e1d8171a5fb31da305c212c7257ea7391b569
--- /dev/null
+++ b/dbus/file_descriptor.cc
@@ -0,0 +1,15 @@
+// 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.
+
+#include "base/platform_file.h"
+#include "dbus/file_descriptor.h"
+
+namespace dbus {
+
+FileDescriptor::~FileDescriptor() {
+  if (owner_)

[satorux1, 2012/03/28 00:32:43]

If we get rid of owner_, this becomes

  if (value_ == -1)

[Sam Leffler, 2012/03/28 17:28:09]

Please explain how to get rid of owner_.  instances may have a valid value_ and
have owner_ true or false.

+    base::ClosePlatformFile(value_);
+}
+
+} // namespace dbus

[keybuk, 2012/03/27 22:36:35]

nit: two spaces before //

[Sam Leffler, 2012/03/27 23:20:40]

copied from object_path; fixed