Support aria-dropeffect attribute.

public/web/WebAXObject.h

 /*
  * Copyright (C) 2009 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 99 matching lines @@
     BLINK_EXPORT bool isSelected() const;
     BLINK_EXPORT bool isSelectedOptionActive() const;
     BLINK_EXPORT bool isVisible() const;
     BLINK_EXPORT bool isVisited() const;
 
     BLINK_EXPORT WebString accessKey() const;
     BLINK_EXPORT WebAXObject ariaActiveDescendant() const;
     BLINK_EXPORT WebString ariaAutoComplete() const;
     BLINK_EXPORT bool ariaControls(WebVector<WebAXObject>& controlsElements) const;
     BLINK_EXPORT bool ariaDescribedby(WebVector<WebAXObject>& describedbyElements) const;
+    BLINK_EXPORT WebString ariaDropEffect() const;
     BLINK_EXPORT bool ariaFlowTo(WebVector<WebAXObject>& flowToElements) const;
     BLINK_EXPORT bool ariaHasPopup() const;
     BLINK_EXPORT bool ariaLabelledby(WebVector<WebAXObject>& labelledbyElements) const;
     BLINK_EXPORT bool ariaOwns(WebVector<WebAXObject>& ownsElements) const;
     BLINK_EXPORT WebRect boundingBoxRect() const;
     BLINK_EXPORT bool canvasHasFallbackContent() const;
     BLINK_EXPORT WebPoint clickPoint() const;
     BLINK_EXPORT void colorValue(int& r, int& g, int& b) const;
     BLINK_EXPORT WebAXInvalidState invalidState() const;
     // Only used when invalidState() returns WebAXInvalidStateOther.
@@ skipping 103 matching lines @@
     operator WTF::PassRefPtr<AXObject>() const;
 #endif
 
 private:
     WebPrivatePtr<AXObject> m_private;
 };
 
 } // namespace blink
 
 #endif