shill: vpn: Associate VPN device with service and update IP configuration.

BUG=chromium-os:27384,chromium-os:27385
TEST=unit tests

Change-Id: I5b35bebeadd25f50f7044d2e4ec5bc121a56835e
Reviewed-on: https://gerrit.chromium.org/gerrit/17488
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_service.cc b/mock_vpn_service.cc
new file mode 100644
index 0000000..56b51a1
--- /dev/null
+++ b/mock_vpn_service.cc
@@ -0,0 +1,18 @@
+// 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_service.h"
+
+namespace shill {
+
+MockVPNService::MockVPNService(ControlInterface *control,
+                               EventDispatcher *dispatcher,
+                               Metrics *metrics,
+                               Manager *manager,
+                               VPNDriver *driver)
+    : VPNService(control, dispatcher, metrics, manager, driver) {}
+
+MockVPNService::~MockVPNService() {}
+
+}  // namespace shill