Adds accessibility role for figure tag and handles its children as a group.

public/web/WebAXEnums.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 82 matching lines @@
     WebAXRoleDescriptionListDetail,
     WebAXRoleDescriptionListTerm,
     WebAXRoleDialog,
     WebAXRoleDirectory,
     WebAXRoleDisclosureTriangle,
     WebAXRoleDiv,
     WebAXRoleDocument,
     WebAXRoleDrawer,
     WebAXRoleEditableText,
     WebAXRoleEmbeddedObject,
+    WebAXRoleFigure,
     WebAXRoleFooter,
     WebAXRoleForm,
     WebAXRoleGrid,
     WebAXRoleGroup,
     WebAXRoleGrowArea,
     WebAXRoleHeading,
     WebAXRoleHelpTag,
     WebAXRoleHorizontalRule,
     WebAXRoleIframe,
     WebAXRoleIgnored,
@@ skipping 103 matching lines @@
 enum WebAXTextDirection {
     WebAXTextDirectionLR,
     WebAXTextDirectionRL,
     WebAXTextDirectionTB,
     WebAXTextDirectionBT
 };
 
 } // namespace blink
 
 #endif