Implement computedRole and computedName (behind a flag)

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 22 matching lines @@
 #include "core/editing/VisiblePosition.h"
 #include "platform/geometry/FloatQuad.h"
 #include "platform/geometry/LayoutRect.h"
 #include "wtf/Forward.h"
 #include "wtf/RefPtr.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 class AXObject;
+class AXObjectCache;
 class AXObjectCacheImpl;
 class Element;
 class FrameView;
 class IntPoint;
 class Node;
 class RenderObject;
 class ScrollableArea;
 class Widget;
 
 typedef unsigned AXID;
 
 enum AccessibilityRole {
+    NoRole = 0,

[dmazzoni, 2014/12/12 00:41:48]

Same comment as before - I think you should use UnknownRole, but if you prefer
NoRole you should add this to WebAXEnums.h and handle it in Chromium too.

     AlertDialogRole = 1,
     AlertRole,
     AnnotationRole,
     ApplicationRole,
     ArticleRole,
     BannerRole,
     BlockquoteRole,
     BusyIndicatorRole,
     ButtonRole,
     CanvasRole,
@@ skipping 95 matching lines @@
     TimerRole,
     ToggleButtonRole,
     ToolbarRole,
     TreeGridRole,
     TreeItemRole,
     TreeRole,
     UnknownRole,
     UserInterfaceTooltipRole,
     WebAreaRole,
     WindowRole,
+    NumRoles
 };
 
 enum AccessibilityTextSource {
     AlternativeText,
     ChildrenText,
     SummaryText,
     HelpText,
     VisibleText,
     TitleTagText,
     PlaceholderText,
@@ skipping 390 matching lines @@
     virtual VisiblePosition visiblePositionForIndex(int) const { return VisiblePosition(); }
     int lineForPosition(const VisiblePosition&) const;
     virtual int index(const VisiblePosition&) const { return -1; }
     virtual void lineBreaks(Vector<int>&) const { }
 
     // Static helper functions.
     static bool isARIAControl(AccessibilityRole);
     static bool isARIAInput(AccessibilityRole);
     static AccessibilityRole ariaRoleToWebCoreRole(const String&);
     static IntRect boundingBoxForQuads(RenderObject*, const Vector<FloatQuad>&);
+    static const AtomicString& roleName(const AccessibilityRole);
 
 protected:
     AXID m_id;
     AccessibilityChildrenVector m_children;
     mutable bool m_haveChildren;
     AccessibilityRole m_role;
     AXObjectInclusion m_lastKnownIsIgnoredValue;
     LayoutRect m_explicitElementRect;
 
     virtual bool computeAccessibilityIsIgnored() const { return true; }
@@ skipping 23 matching lines @@
     // functions called here may only search up the tree (ancestors), not down.
     void updateCachedAttributeValuesIfNeeded() const;
 };
 
 #define DEFINE_AX_OBJECT_TYPE_CASTS(thisType, predicate) \
     DEFINE_TYPE_CASTS(thisType, AXObject, object, object->predicate, object.predicate)
 
 } // namespace blink
 
 #endif // AXObject_h