[chromium] Improve keyboardEvent() so a web page could receive a DOM3 spec compliant...

[chromium] Improve keyboardEvent() so a web page could receive a DOM3 spec compliant keyboard event.
https://bugs.webkit.org/show_bug.cgi?id=89637

Patch by Yusuke Sato <yusukes@chromium.org> on 2012-06-27
Reviewed by Tony Chang.

This is a Gtk port of http://crrev.com/142209.

Normalizes event->state to make it Windows/Mac compatible. Since the
way of setting modifier mask on X is very different than Windows/Mac
as shown in http://crbug.com/127142#c8, the normalization is necessary.

* src/gtk/WebInputEventFactory.cpp:
(WebKit):
(WebKit::normalizeEventState):
(WebKit::WebInputEventFactory::keyboardEvent):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@121397 268f45cc-cd09-0410-ab3c-d52691b4dbfc