[BlackBerry] Selection overlay is sometimes in wrong position.
https://bugs.webkit.org/show_bug.cgi?id=112748

Patch by Andrew Lo <anlo@rim.com> on 2013-03-19
Reviewed by Rob Buis.
Internally reviewed by Arvid Nilsson.

Internal PR 305384.
Translate by parent's offset when drawing selection overlay.

* WebKitSupport/SelectionOverlay.cpp:
(BlackBerry::WebKit::SelectionOverlay::paintContents):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@146278 268f45cc-cd09-0410-ab3c-d52691b4dbfc