shill: Enable the ModemManager.Modem on Cellular device start.

Also, move DBus.Object/Connection properties to the Cellular device,
initializing them to the right values.

BUG=chromium-os:18315
TEST=unit tests, tested on device

Change-Id: I5788ca7aa375afee757fbd96edf96f9d07f29ded
Reviewed-on: http://gerrit.chromium.org/gerrit/4947
Reviewed-by: Darin Petkov <petkov@chromium.org>
Tested-by: Darin Petkov <petkov@chromium.org>
diff --git a/mock_modem_proxy.h b/mock_modem_proxy.h
new file mode 100644
index 0000000..7146ede
--- /dev/null
+++ b/mock_modem_proxy.h
@@ -0,0 +1,21 @@
+// Copyright (c) 2011 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.
+
+#ifndef SHILL_MOCK_MODEM_PROXY_H_
+#define SHILL_MOCK_MODEM_PROXY_H_
+
+#include <gmock/gmock.h>
+
+#include "shill/modem_proxy_interface.h"
+
+namespace shill {
+
+class MockModemProxy : public ModemProxyInterface {
+ public:
+  MOCK_METHOD1(Enable, void(const bool enable));
+};
+
+}  // namespace shill
+
+#endif  // SHILL_MOCK_MODEM_PROXY_H_