Handles aria-dropeffect after getting its value from blink.

ui/accessibility/ax_node_data.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/accessibility/ax_node_data.h"
 
 #include <set>
 
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
@@ skipping 262 matching lines @@
         break;
       case AX_ATTR_AUTO_COMPLETE:
         result += " autocomplete=" + value;
         break;
       case AX_ATTR_DESCRIPTION:
         result += " description=" + value;
         break;
       case AX_ATTR_DISPLAY:
         result += " display=" + value;
         break;
+      case AX_ATTR_DROPEFFECT:
+        result += " dropeffect=" + value;
+        break;
       case AX_ATTR_HELP:
         result += " help=" + value;
         break;
       case AX_ATTR_HTML_TAG:
         result += " html_tag=" + value;
         break;
       case AX_ATTR_ARIA_INVALID_VALUE:
         result += " aria_invalid_value=" + value;
         break;
       case AX_ATTR_LIVE_RELEVANT:
@@ skipping 142 matching lines @@
     }
   }
 
   if (!child_ids.empty())
     result += " child_ids=" + IntVectorToString(child_ids);
 
   return result;
 }
 
 }  // namespace ui