Various fixes for aria-activedescendant.

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

 /*
  * Copyright (C) 2012, 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:
  *
  * 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 112 matching lines @@
     bool isClickable() const final;
     bool isEnabled() const override;
     AccessibilityExpanded isExpanded() const override;
     bool isPressed() const final;
     bool isReadOnly() const override;
     bool isRequired() const final;
 
     // Check whether certain properties can be modified.
     bool canSetFocusAttribute() const override;
     bool canSetValueAttribute() const override;
+    bool canSetSelectedAttribute() const override;
 
     // Properties of static elements.
     RGBA32 colorValue() const final;
     bool canvasHasFallbackContent() const final;
     int headingLevel() const final;
     unsigned hierarchicalLevel() const final;
     AccessibilityOrientation orientation() const override;
     String text() const override;
 
     // Properties of interactive elements.
@@ skipping 64 matching lines @@
     bool isNativeCheckboxInMixedState() const;
     String textFromDescendants(AXObjectSet& visited, bool recursive) const override;
     String nativeTextAlternative(AXObjectSet& visited, AXNameFrom&, AXRelatedObjectVector*, NameSources*, bool* foundTextAlternative) const;
     float stepValueForRange() const;
     bool isDescendantOfElementType(const HTMLQualifiedName& tagName) const;
 };
 
 } // namespace blink
 
 #endif // AXNodeObject_h