our simplebrowser example needs some private browsing icon

Currently in simple browser example if we switch to 'private browsing' / 'incognito mode' there is no visual indication. it would be great to have some icon on the "bar" .

Simple browser example have following application icon:

http://code.qt.io/cgit/qt/qtwebengine.git/plain/examples/webenginewidgets/simplebrowser/data/AppLogoColor.png