Automatically fire AX events on Win based on tree changes

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 <stddef.h>
 
 #include <set>
 
@@ skipping 83 matching lines @@
         break;
       default:
         NOTREACHED();
     }
   }
 
   void AddObjectAttribute(WebAXObjectAttribute attribute,
                           const WebAXObject& value) override {
     switch (attribute) {
       case WebAXObjectAttribute::kAriaActiveDescendant:
-        dst_->AddIntAttribute(ui::AX_ATTR_ACTIVEDESCENDANT_ID, value.AxID());
+        // TODO(dmazzoni): WebAXObject::ActiveDescendant currently returns
+        // more information than the sparse interface does.
         break;
       case WebAXObjectAttribute::kAriaDetails:
         dst_->AddIntAttribute(ui::AX_ATTR_DETAILS_ID, value.AxID());
         break;
       case WebAXObjectAttribute::kAriaErrorMessage:
         dst_->AddIntAttribute(ui::AX_ATTR_ERRORMESSAGE_ID, value.AxID());
         break;
       default:
         NOTREACHED();
     }
@@ skipping 783 matching lines @@
     return WebAXObject();
 
   WebDocument document = render_frame_->GetWebFrame()->GetDocument();
   if (!document.IsNull())
     return WebAXObject::FromWebDocument(document);
 
   return WebAXObject();
 }
 
 }  // namespace content