Reviewed by Benjamin Poulain.

        [Qt] Crash when calling QWebFrame::render() in response to QWebPage::repaintRequested()
        https://bugs.webkit.org/show_bug.cgi?id=52629

        * WebCoreSupport/ChromeClientQt.cpp:
        (WebCore::ChromeClientQt::invalidateContentsAndWindow): Make the emission of
        QWebPage::repaintRequested() use a Qt::QueuedConnection.

        * tests/qwebpage/tst_qwebpage.cpp:
        (RepaintRequestedRenderer::RepaintRequestedRenderer):
        (RepaintRequestedRenderer::onRepaintRequested):
        (tst_QWebPage::renderOnRepaintRequestedShouldNotRecurse): Test that calling
        QWebFrame::render() in a slot connected to to QWebPage::repaintRequested()
        doesn't cause recursive signal emissions.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@82142 268f45cc-cd09-0410-ab3c-d52691b4dbfc