Add audio role API to QMediaPlayer.

Change-Id: Ia5e3e2fe714f10b6aad62f0a4801c607905c7e0d
Task-number: QTBUG-41054
Reviewed-by: Yoann Lopes <yoann.lopes@theqtcompany.com>

tests/auto/unit/qmultimedia_common/mockaudiorolecontrol.h

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+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** 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 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** As a special exception, The Qt Company gives you certain additional
+** rights. These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef MOCKAUDIOROLECONTROL_H
+#define MOCKAUDIOROLECONTROL_H
+
+#include <qaudiorolecontrol.h>
+
+class MockAudioRoleControl : public QAudioRoleControl
+{
+    friend class MockMediaPlayerService;
+
+public:
+    MockAudioRoleControl()
+        : QAudioRoleControl()
+        , m_audioRole(QAudio::UnknownRole)
+    {
+    }
+
+    QAudio::Role audioRole() const
+    {
+        return m_audioRole;
+    }
+
+    void setAudioRole(QAudio::Role role)
+    {
+        if (role != m_audioRole)
+            emit audioRoleChanged(m_audioRole = role);
+    }
+
+    QList<QAudio::Role> supportedAudioRoles() const
+    {
+        return QList<QAudio::Role>() << QAudio::MusicRole
+                                     << QAudio::AlarmRole
+                                     << QAudio::NotificationRole;
+    }
+
+    QAudio::Role m_audioRole;
+};
+
+#endif // MOCKAUDIOROLECONTROL_H
+