https://bugs.webkit.org/show_bug.cgi?id=122534

Patch by Samuel White <samuel_white@apple.com> on 2013-10-14
Reviewed by Chris Fleizach.

Source/WebCore:

Changes fieldset to derive AXDescription from legend if one is available. Added
convenience method to AccessibilityObject to fetch element if available.

Test: accessibility/fieldset-element.html

* accessibility/AccessibilityNodeObject.cpp:
(WebCore::AccessibilityNodeObject::canHaveChildren):
(WebCore::AccessibilityNodeObject::alternativeText):
* accessibility/AccessibilityObject.cpp:
(WebCore::AccessibilityObject::element):
(WebCore::AccessibilityObject::isARIAHidden):
(WebCore::AccessibilityObject::isDOMHidden):
(WebCore::AccessibilityObject::defaultObjectInclusion):
* accessibility/AccessibilityObject.h:
(WebCore::AccessibilityObject::isHidden):
* accessibility/AccessibilitySlider.cpp:
(WebCore::AccessibilitySlider::getAttribute):
(WebCore::AccessibilitySlider::valueForRange):
(WebCore::AccessibilitySlider::maxValueForRange):
(WebCore::AccessibilitySlider::minValueForRange):
(WebCore::AccessibilitySlider::setValue):
(WebCore::AccessibilitySlider::inputElement):
* accessibility/AccessibilitySlider.h:
* accessibility/mac/AccessibilityObjectMac.mm:
(WebCore::AccessibilityObject::accessibilityPlatformIncludesObject):
* html/HTMLFieldSetElement.cpp:
(WebCore::HTMLFieldSetElement::legend):
* html/HTMLFieldSetElement.h:

LayoutTests:

legend no longer treated as titleUIElement so removing tests that check this functionality.
Added test to check that legend is used as AXDescription of fieldset if present.

* accessibility/fieldset-element.html: Added.
* accessibility/hidden-legend-expected.txt: Removed.
* accessibility/hidden-legend.html: Removed.
* accessibility/legend.html: Removed.
* platform/efl/accessibility/legend-expected.txt: Removed.
* platform/gtk/accessibility/legend-expected.txt: Removed.
* platform/mac/accessibility/fieldset-element-expected.txt: Added.
* platform/mac/accessibility/legend-expected.txt: Removed.
* platform/mac/accessibility/role-subrole-roledescription-expected.txt:
* platform/mac/accessibility/role-subrole-roledescription.html:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@157434 268f45cc-cd09-0410-ab3c-d52691b4dbfc