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

Source/modules/accessibility/AXLayoutObject.h

 /*
  * Copyright (C) 2008 Apple 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 54 matching lines @@
     virtual AccessibilityRole determineAccessibilityRole() override;
     void checkCachedElementRect() const;
     void updateCachedElementRect() const;
 
 protected:
     LayoutObject* m_layoutObject;
     mutable LayoutRect m_cachedElementRect;
     mutable LayoutRect m_cachedFrameRect;
     mutable IntPoint m_cachedScrollPosition;
     mutable bool m_cachedElementRectDirty;
+    mutable bool m_hasInheritedPresentationRole;
 
     //
     // Overridden from AXObject.
     //
 
     virtual void init() override;
     virtual void detach() override;
     virtual bool isDetached() const override { return !m_layoutObject; }
     virtual bool isAXLayoutObject() const override { return true; }
 
@@ skipping 100 matching lines @@
     // Notifications that this object may have changed.
     virtual void handleActiveDescendantChanged() override;
     virtual void handleAriaExpandedChanged() override;
     virtual void textChanged() override;
 
     // Text metrics. Most of these should be deprecated, needs major cleanup.
     virtual int index(const VisiblePosition&) const override;
     virtual VisiblePosition visiblePositionForIndex(int) const override;
     virtual void lineBreaks(Vector<int>&) const override;
 
+    virtual bool hasInheritedPresentationRole() const override { return m_hasInheritedPresentationRole; }
+    bool isPresentationRole(AXObject*) const;

[dmazzoni, 2015/03/29 07:46:22]

Implement this in AXNodeObject instead of AXLayoutObject.

In general, use AXNodeObject when the only information you need is the node -
like ARIA attributes. AXLayoutObject should be used when the implementation
might depend on the CSS style, on its laid-out position / size, etc.

This isn't perfect now. Originally everything was in AXLayoutObject (or
AXRenderObject, as it was called until recently). I added AXNodeObject and
slowly we've been moving things from AXLayoutObject to AXNodeObject where they
make sense.

If you have a <canvas> element, the nodes inside the canvas aren't drawn. They
will have AXNodeObjects but they won't have AXLayoutObjects.

[je_julie(Not used), 2015/03/31 16:14:27]

Thanks for suggestion.
I move it at AXNodeObject.

+    bool isPresentationRoleInTable(AXObject*) const;
+
 private:
     bool isAllowedChildOfTree() const;
     void ariaListboxSelectedChildren(AccessibilityChildrenVector&);
     PlainTextRange ariaSelectedTextRange() const;
     bool nodeIsTextControl(const Node*) const;
     bool isTabItemSelected() const;
     AXObject* accessibilityImageMapHitTest(HTMLAreaElement*, const IntPoint&) const;
     bool layoutObjectIsObservable(LayoutObject*) const;
     LayoutObject* layoutParentObject() const;
     bool isDescendantOfElementType(const HTMLQualifiedName& tagName) const;
+    bool isListElement(Node*) const;
+    bool isRequiredOwnedElement(AXObject*) const;
     bool isSVGImage() const;
     void detachRemoteSVGRoot();
     AXSVGRoot* remoteSVGRootElement() const;
     AXObject* remoteSVGElementHitTest(const IntPoint&) const;
     void offsetBoundingBoxForRemoteSVGElement(LayoutRect&) const;
     void addHiddenChildren();
     void addTextFieldChildren();
     void addImageMapChildren();
     void addCanvasChildren();
     void addAttachmentChildren();
     void addPopupChildren();
     void addRemoteSVGChildren();
     void addInlineTextBoxChildren(bool force);
 
     void ariaSelectedRows(AccessibilityChildrenVector&);
     bool elementAttributeValue(const QualifiedName&) const;
     bool inheritsPresentationalRole() const;
     LayoutRect computeElementRect() const;
     VisibleSelection selection() const;
     int indexForVisiblePosition(const VisiblePosition&) const;
     void accessibilityChildrenFromAttribute(QualifiedName attr, AccessibilityChildrenVector&) const;
 };
 
 DEFINE_AX_OBJECT_TYPE_CASTS(AXLayoutObject, isAXLayoutObject());
 
 } // namespace blink
 
 #endif // AXLayoutObject_h