https://bugs.webkit.org/show_bug.cgi?id=123649

Reviewed by Chris Fleizach.

No new tests, the change occurs in a code path that forces the context menu to show which
locks up DRT if we try to test it (platform menu is shown). The change itself gives the mouse
event handler a chance to handle our platform mouse event BEFORE the event ends up in the show
context menu machinery. This is necessary because without it, the element will not become
focused. Without focus, accessibility shows different/less menu items than a mouse click. The
end result is that context menus shown via accessibility are consistent with menus shown via click.

* page/ContextMenuController.cpp:
(WebCore::ContextMenuController::showContextMenuAt):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@158629 268f45cc-cd09-0410-ab3c-d52691b4dbfc