Changes: Use xcb in MSnapshotItem::updateSnapshot to avoid XSync.
Changes: Use xcb in MSnapshotItem::updateSnapshot to avoid XSync.

RevBy: Daniel d'Andrada
Details: Avoid error handler switching and hence calls to XSync.
xcb_request_check will sync the connection only if needed. Since
XSync is a slow operation, this should result in performance
improvements.

nemomobile-graveyard/libmeegotouch,nemomobile-graveyard/libmeegotouch,nemomobile-graveyard/libmeegotouch,nemomobile-graveyard/libmeegotouch,nemomobile-graveyard/libmeegotouch,nemomobile-graveyard/libmeegotouch