shill: vpn: Spawn the OpenVPN process when tunnel index becomes available.

BUG=chromium-os:27373
TEST=unit tests

Change-Id: Ie946e4275beff4d5ac176413cc219dbe52356b28
Reviewed-on: https://gerrit.chromium.org/gerrit/17407
Commit-Ready: Darin Petkov <petkov@chromium.org>
Reviewed-by: Darin Petkov <petkov@chromium.org>
Tested-by: Darin Petkov <petkov@chromium.org>
diff --git a/mock_vpn.cc b/mock_vpn.cc
new file mode 100644
index 0000000..74d538a
--- /dev/null
+++ b/mock_vpn.cc
@@ -0,0 +1,19 @@
+// Copyright (c) 2012 The Chromium OS 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 "shill/mock_vpn.h"
+
+namespace shill {
+
+MockVPN::MockVPN(ControlInterface *control,
+                 EventDispatcher *dispatcher,
+                 Metrics *metrics,
+                 Manager *manager,
+                 const std::string &link_name,
+                 int interface_index)
+    : VPN(control, dispatcher, metrics, manager, link_name, interface_index) {}
+
+MockVPN::~MockVPN() {}
+
+}  // namespace shill