chromeos: Add a stub implementation for SensorsSource.

chrome/browser/chromeos/dbus/sensors_client.h

+// Copyright (c) 2011 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.
+
+#ifndef CHROME_BROWSER_CHROMEOS_DBUS_SENSORS_CLIENT_H_
+#define CHROME_BROWSER_CHROMEOS_DBUS_SENSORS_CLIENT_H_
+
+#include "base/basictypes.h"
+
+namespace dbus {
+class Bus;
+class ObjectProxy;
+class Signal;
+}  // namespace
+
+namespace chromeos {
+
+// Creates and manages a dbus signal receiver for device orientation changes,
+// and eventually receives data for other motion-related sensors.
+class SensorsClient {
+ public:
+  virtual ~SensorsClient();
+
+  // Creates the instance.
+  static SensorsClient* Create(dbus::Bus* bus);
+
+ protected:
+  // Create() should be used instead.
+  SensorsClient();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(SensorsClient);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_DBUS_SENSORS_CLIENT_H_