[shill] Add support for setting properties.

This CL adds a framework for supporting RPC-exposed properties in Shill.
It also plumbs the code for setting properties on Service objects to prove
the approach.  Device and Manager settings will follow.

BUG=chromium-os:16343
TEST=build shill, run unit tests.

Change-Id: I55869453d6039e688f1a49be9dfb1ba1315efe0a
Reviewed-on: http://gerrit.chromium.org/gerrit/3004
Reviewed-by: Darin Petkov <petkov@chromium.org>
Tested-by: Chris Masone <cmasone@chromium.org>
diff --git a/cellular.cc b/cellular.cc
new file mode 100644
index 0000000..92e8262
--- /dev/null
+++ b/cellular.cc
@@ -0,0 +1,57 @@
+// 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.
+
+#include "shill/cellular.h"
+
+#include <string>
+
+#include <base/logging.h>
+
+#include "shill/cellular_service.h"
+#include "shill/control_interface.h"
+#include "shill/device.h"
+#include "shill/device_info.h"
+#include "shill/manager.h"
+#include "shill/shill_event.h"
+
+using std::string;
+
+namespace shill {
+
+Cellular::Cellular(ControlInterface *control_interface,
+                   EventDispatcher *dispatcher,
+                   Manager *manager,
+                   const string &link,
+                   int interface_index)
+    : Device(control_interface,
+             dispatcher,
+             manager,
+             link,
+             interface_index),
+      service_(new CellularService(control_interface,
+                                   dispatcher,
+                                   this,
+                                   "service-" + link)),
+      service_registered_(false) {
+  VLOG(2) << "Cellular device " << link_name() << " initialized.";
+}
+
+Cellular::~Cellular() {
+  Stop();
+}
+
+void Cellular::Start() {
+  Device::Start();
+}
+
+void Cellular::Stop() {
+  manager_->DeregisterService(service_.get());
+  Device::Stop();
+}
+
+bool Cellular::TechnologyIs(const Device::Technology type) {
+  return type == Device::kCellular;
+}
+
+}  // namespace shill