Reports the position of the caret and current selection in content editables.

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 495 matching lines @@
     dst->AddFloatAttribute(ui::AX_ATTR_DOC_LOADING_PROGRESS,
                            src.estimatedLoadingProgress());
 
     const WebDocumentType& doctype = document.doctype();
     if (!doctype.isNull()) {
       dst->AddStringAttribute(
           ui::AX_ATTR_DOC_DOCTYPE,
           UTF16ToUTF8(base::StringPiece16(doctype.name())));
     }
 
+    WebAXObject anchor_object, focus_object;
+    int anchor_offset, focus_offset;
+    src.selection(anchor_object, anchor_offset, focus_object, focus_offset);
+    if (!anchor_object.isNull() && !focus_object.isNull() &&
+        anchor_offset >= 0 && focus_offset >= 0) {
+      int32 anchor_id = anchor_object.axID();
+      int32 focus_id = focus_object.axID();
+      dst->AddIntAttribute(ui::AX_ATTR_ANCHOR_OBJECT_ID, anchor_id);
+      dst->AddIntAttribute(ui::AX_ATTR_ANCHOR_OFFSET, anchor_offset);
+      dst->AddIntAttribute(ui::AX_ATTR_FOCUS_OBJECT_ID, focus_id);
+      dst->AddIntAttribute(ui::AX_ATTR_FOCUS_OFFSET, focus_offset);
+    }
   }
 
   if (dst->role == ui::AX_ROLE_TABLE) {
     int column_count = src.columnCount();
     int row_count = src.rowCount();
     if (column_count > 0 && row_count > 0) {
       std::set<int32> unique_cell_id_set;
       std::vector<int32> cell_ids;
       std::vector<int32> unique_cell_ids;
       dst->AddIntAttribute(ui::AX_ATTR_TABLE_COLUMN_COUNT, column_count);
@@ skipping 109 matching lines @@
   }
 }
 
 blink::WebDocument BlinkAXTreeSource::GetMainDocument() const {
   if (render_frame_ && render_frame_->GetWebFrame())
     return render_frame_->GetWebFrame()->document();
   return WebDocument();
 }
 
 }  // namespace content