Reviewed by Brady.

        This patch adds support for the ARIA progressbar role and the 
        following ARIA states (ie HTML attributes): aria-checked, aria-
        level, aria-pressed, aria-valuenow, aria-valuemin, and aria-
        valuemax.

        * html/HTMLAttributeNames.in:
        * page/AccessibilityObject.h:
        (WebCore::AccessibilityObject::isProgressIndicator):
        (WebCore::AccessibilityObject::valueForRange):
        (WebCore::AccessibilityObject::maxValueForRange):
        (WebCore::AccessibilityObject::minValueForRange):
        * page/AccessibilityRenderObject.cpp:
        (WebCore::AccessibilityRenderObject::isProgressIndicator):
        (WebCore::AccessibilityRenderObject::isPressed): Check the aria-
        pressed attribute if this is an ARIA button.
        (WebCore::AccessibilityRenderObject::headingLevel): Check the aria-
        level attribute if this is an ARIA heading.
        (WebCore::AccessibilityRenderObject::intValue): Check the aria-
        checked attribute if this is an ARIA radio button or checkbox.
        (WebCore::AccessibilityRenderObject::valueForRange):
        (WebCore::AccessibilityRenderObject::maxValueForRange):
        (WebCore::AccessibilityRenderObject::minValueForRange):
        (WebCore::RoleEntry::):
        (WebCore::AccessibilityRenderObject::canSetValueAttribute):
        * page/AccessibilityRenderObject.h:
        * page/mac/AccessibilityObjectWrapper.mm:
        (-[AccessibilityObjectWrapper accessibilityAttributeNames]):
        (-[AccessibilityObjectWrapper accessibilityAttributeValue:]):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@33465 268f45cc-cd09-0410-ab3c-d52691b4dbfc