QmlProfiler: Delay creation of views until activation

We don't need to waste the time and memory required to create the views
if they are never shown.

Change-Id: I56add08981c90263e6735f5b7e6fac2140b457e4
Fixes: QTCREATORBUG-21894
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>
Reviewed-by: hjk <hjk@qt.io>

src/plugins/qmlprofiler/qmlprofilerviewmanager.h

@@ -58,8 +58,11 @@ public:
 signals:
     void typeSelected(int typeId);
     void gotoSourceLocation(QString,int,int);
+    void viewsCreated();
 
 private:
+    void createViews();
+
     QmlProfilerTraceView *m_traceView = nullptr;
     QmlProfilerStatisticsView *m_statisticsView = nullptr;
     FlameGraphView *m_flameGraphView = nullptr;