Add proper offset to position right click to simulate a context menu invocation.

Add proper offset to position right click to simulate a context menu invocation.
https://bugs.webkit.org/show_bug.cgi?id=76421

Patch by Marc-Andre Decoste <mad@chromium.org> on 2012-01-20
Reviewed by Ojan Vafai.

.:

* ManualTests/win/contextmenu-key3.html: Added.

Source/WebCore:

Manual tests only because DRT doesn't support context menu key.

* page/EventHandler.cpp:
(WebCore::EventHandler::sendContextMenuEventForKey):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@105538 268f45cc-cd09-0410-ab3c-d52691b4dbfc