Adds AX role for abbr tag.

third_party/WebKit/Source/modules/accessibility/AXObject.h

 /*
  * Copyright (C) 2008, 2009, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nuanti Ltd.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 39 matching lines @@
 class NameSource;
 class Node;
 class LayoutObject;
 class ScrollableArea;
 class Widget;
 
 typedef unsigned AXID;
 
 enum AccessibilityRole {
     UnknownRole = 0,
+    AbbrRole, // No mapping to ARIA role
     AlertDialogRole,
     AlertRole,
     AnnotationRole, // No mapping to ARIA role
     ApplicationRole,
     ArticleRole,
     BannerRole,
     BlockquoteRole, // No mapping to ARIA role
     BusyIndicatorRole, // No mapping to ARIA role
     ButtonRole,
     CanvasRole, // No mapping to ARIA role
@@ skipping 883 matching lines @@
 #define DEFINE_AX_OBJECT_TYPE_CASTS(thisType, predicate) \
     DEFINE_TYPE_CASTS(thisType, AXObject, object, object->predicate, object.predicate)
 
 } // namespace blink
 
 WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS(blink::IgnoredReason);
 WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS(blink::NameSource);
 WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS(blink::DescriptionSource);
 
 #endif // AXObject_h