QmlProfiler: Add test for debug messages model

Change-Id: Ie6872646c09a89a417379a3e1f551526234ab26a
Reviewed-by: Christian Kandeler <christian.kandeler@theqtcompany.com>

src/plugins/qmlprofiler/qmlprofilerplugin.h

@@ -46,6 +46,8 @@ public:
 
     static bool debugOutput;
     static QmlProfilerSettings *globalSettings();
+
+    QList<QObject *> createTestObjects() const override;
 };
 
 } // namespace Internal