QmlDesigner.itemLibrary: adding plugin for extra components

A new extra component plugin.

src/plugins/qmldesigner/extrasplugin/extrasplugin.cpp

@@ -0,0 +1,58 @@
+/**************************************************************************
+**
+** This file is part of Qt Creator
+**
+** Copyright (c) 2011 Nokia Corporation and/or its subsidiary(-ies).
+**
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** No Commercial Usage
+**
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+**
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**************************************************************************/
+
+#include "extrasplugin.h"
+#include <widgetplugin_helper.h>
+#include <QtCore/QtPlugin>
+
+namespace QmlDesigner {
+
+
+ExtrasPlugin::ExtrasPlugin()
+{
+}
+
+QString ExtrasPlugin::pluginName()
+{
+    return ("ExtrasPlugin");
+}
+
+QString ExtrasPlugin::metaInfo()
+{
+    return QString(":/extrasplugin/extras.metainfo");
+}
+
+}
+
+Q_EXPORT_PLUGIN(QmlDesigner::ExtrasPlugin)
+