2008-04-30 Beth Dakin <bdakin@apple.com>

2008-04-30  Beth Dakin  <bdakin@apple.com>

        Reviewed by Sam Weinig.

        This patch does three things:
        1. Adds support for the "img" ARIA role
        2. Switches over to a HashMap for converting ARIA role attributes
        to WebCore's AccessibilityRole type.
        3. Fixes a crash in the new ARIA code that I ran into while
        browsing with VoiceOver enabled.

        * page/AccessibilityObject.cpp:
        (WebCore::AccessibilityObject::headingLevel): This is the crash
        fix. Make sure the node's renderer is not null before looking up
        its corresponding AccessibilityObject in the cache.
        (WebCore::AccessibilityObject::accessibilityIsIgnored): Account for
        ARIA images.
        (WebCore::createARIARoleMap): Switch to HashMap, and add "img" to
        the Map.
        (WebCore::RoleEntry::): Same.
        (WebCore::ariaRoleToWebCoreRole): Same.
        (WebCore::AccessibilityObject::ariaRoleAttribute): Same.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@32751 268f45cc-cd09-0410-ab3c-d52691b4dbfc