QmlCppEngine: Update Views when switching between engines.

Change-Id: I90958e77c4d8c845ef6e55fe65eaffe0ac24dcc5
Reviewed-by: Kai Koehne <kai.koehne@nokia.com>

src/plugins/debugger/qml/qmlcppengine.h

@@ -138,6 +138,7 @@ private:
     void slaveEngineStateChanged(DebuggerEngine *slaveEngine, DebuggerState state);
 
     void readyToExecuteQmlStep();
+    void setActiveEngine(DebuggerEngine *engine);
 
 private:
     QmlCppEnginePrivate *d;