Build on Qt5.7 failed!

[huaxz1986]

When I tried to build on Qt 5.7 ,it failed! I read advice of "Porting from Qt WebKit to Qt WebEngine" given by Qt , but there are so many questions in building, such as ' m_webView->page()->mainFrame()->scrollBarValue(Qt::Vertical)'

[dbelyaev]

@huaxz1986, you can find some answers in the related issue #303.

[laris]

@huaxz1986 Thanks for your work to merge offline code and I try to build in QT5.6 and hope to fork your branch but failed.

hope the official code can update to support QTWebEngine.