AX presentation role should be inherited to its required owned elements.

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 594 matching lines @@
     virtual void selectionChanged();
     virtual void textChanged() { }
     virtual void updateAccessibilityRole() { }
 
     // Text metrics. Most of these should be deprecated, needs major cleanup.
     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 { }
 
+    // Returns it has implicit inheritedPresentation Role.
+    virtual bool hasInheritedPresentationRole() const { return false; }
+
     // Static helper functions.
     static bool isARIAControl(AccessibilityRole);
     static bool isARIAInput(AccessibilityRole);
     static AccessibilityRole ariaRoleToWebCoreRole(const String&);
     static IntRect boundingBoxForQuads(LayoutObject*, const Vector<FloatQuad>&);
     static const AtomicString& roleName(AccessibilityRole);
     static bool isInsideFocusableElementOrARIAWidget(const Node&);
 
 protected:
     AXID m_id;
@@ skipping 36 matching lines @@
     static bool includesARIAWidgetRole(const String&);
     static bool hasInteractiveARIAAttribute(const Element&);
 };
 
 #define DEFINE_AX_OBJECT_TYPE_CASTS(thisType, predicate) \
     DEFINE_TYPE_CASTS(thisType, AXObject, object, object->predicate, object.predicate)
 
 } // namespace blink
 
 #endif // AXObject_h