Add support for maction@toggle
https://bugs.webkit.org/show_bug.cgi?id=120059

Patch by Frédéric Wang <fred.wang@free.fr> on 2013-12-15
Reviewed by Chris Fleizach.

Source/WebCore:

Test: mathml/presentation/maction-toggle.html

* mathml/MathMLSelectElement.cpp:
(WebCore::MathMLSelectElement::getSelectedChildAndIndex):
(WebCore::MathMLSelectElement::updateSelectedChild):
(WebCore::MathMLSelectElement::defaultEventHandler):
(WebCore::MathMLSelectElement::willRespondToMouseClickEvents):
(WebCore::MathMLSelectElement::toggle):
* mathml/MathMLSelectElement.h:

LayoutTests:

* mathml/presentation/maction-toggle-expected.html: Added.
* mathml/presentation/maction-toggle.html: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@160631 268f45cc-cd09-0410-ab3c-d52691b4dbfc