Handles aria-dropeffect after getting its value from blink.

content/renderer/accessibility/blink_ax_tree_source.cc

 // Copyright 2014 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 "content/renderer/accessibility/blink_ax_tree_source.h"
 
 #include <set>
 
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
@@ skipping 556 matching lines @@
   WebVector<WebAXObject> controls;
   if (src.ariaControls(controls))
     AddIntListAttributeFromWebObjects(ui::AX_ATTR_CONTROLS_IDS, controls, dst);
 
   WebVector<WebAXObject> describedby;
   if (src.ariaDescribedby(describedby)) {
     AddIntListAttributeFromWebObjects(
         ui::AX_ATTR_DESCRIBEDBY_IDS, describedby, dst);
   }
 
+  if (src.ariaDropEffect().length()) {
+    dst->AddStringAttribute(ui::AX_ATTR_DROPEFFECT,
+        UTF16ToUTF8(src.ariaDropEffect()));
+  }
+
   WebVector<WebAXObject> flowTo;
   if (src.ariaFlowTo(flowTo))
     AddIntListAttributeFromWebObjects(ui::AX_ATTR_FLOWTO_IDS, flowTo, dst);
 
   WebVector<WebAXObject> labelledby;
   if (src.ariaLabelledby(labelledby)) {
     AddIntListAttributeFromWebObjects(
         ui::AX_ATTR_LABELLEDBY_IDS, labelledby, dst);
   }
 
   WebVector<WebAXObject> owns;
   if (src.ariaOwns(owns))
     AddIntListAttributeFromWebObjects(ui::AX_ATTR_OWNS_IDS, owns, dst);
 }
 
 blink::WebDocument BlinkAXTreeSource::GetMainDocument() const {
   if (render_frame_ && render_frame_->GetWebFrame())
     return render_frame_->GetWebFrame()->document();
   return WebDocument();
 }
 
 }  // namespace content