Expose isRadioButton and isCheckbox API in chromium-webkit glue layer.
https://bugs.webkit.org/show_bug.cgi?id=108031

Patch by Raman Kumar <ramankk@chromium.org> on 2013-01-28
Reviewed by Adam Barth.

In chromium, to know if an InputElement is radiobutton or a checkbox,
we are checking for formControlType (a string comparision), which is
very slow. Exposing these API to chromium will make them faster.

* public/WebInputElement.h:
(WebInputElement):
* src/WebInputElement.cpp:
(WebKit::WebInputElement::isRadioButton):
(WebKit):
(WebKit::WebInputElement::isCheckbox):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@141055 268f45cc-cd09-0410-ab3c-d52691b4dbfc