add a latency after simulating keyevets since they are queued up

Change-Id: Iaaaf01ab464cb2d310ed738de85ffdecd6cd854f
Reviewed-on: http://codereview.qt-project.org/5770
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Matthew Cattell <matthew.cattell@nokia.com>
Reviewed-by: Sergio Ahumada <sergio.ahumada@nokia.com>

src/testlib/qtestkeyboard.h

@@ -74,6 +74,11 @@ namespace QTest
         QEvent::Type type;
         type = press ? QEvent::KeyPress : QEvent::KeyRelease;
         QWindowSystemInterface::handleKeyEvent(window, type, code, modifier, text, repeat, delay);
+#ifdef QT_MAC_USE_COCOA
+        QTest::qWait(20);
+#else
+        qApp->processEvents();
+#endif
     }
 
     static void sendKeyEvent(KeyAction action, QWindow *window, Qt::Key code,