One accessibility tree per frame.

content/browser/accessibility/accessibility_tree_formatter_blink.cc

 // Copyright (c) 2015 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 <stddef.h>
 
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
 #include "content/browser/accessibility/accessibility_tree_formatter_blink.h"
 
@@ skipping 21 matching lines @@
     return node.PlatformGetChild(i);
   else
     return node.InternalGetChild(i);
 }
 
 void AccessibilityTreeFormatterBlink::AddProperties(
     const BrowserAccessibility& node,
     base::DictionaryValue* dict) {
   dict->SetInteger("id", node.GetId());
 
-  dict->SetString("role", ui::ToString(node.GetData().role));
+  dict->SetString("internalRole", ui::ToString(node.GetData().role));
 
   dict->SetInteger("boundsX", node.GetData().location.x());
   dict->SetInteger("boundsY", node.GetData().location.y());
   dict->SetInteger("boundsWidth", node.GetData().location.width());
   dict->SetInteger("boundsHeight", node.GetData().location.height());
 
   for (int state_index = ui::AX_STATE_NONE;
        state_index <= ui::AX_STATE_LAST;
        ++state_index) {
     auto state = static_cast<ui::AXState>(state_index);
@@ skipping 52 matching lines @@
     const base::DictionaryValue& dict) {
   base::string16 line;
 
   if (show_ids()) {
     int id_value;
     dict.GetInteger("id", &id_value);
     WriteAttribute(true, base::IntToString16(id_value), &line);
   }
 
   base::string16 role_value;
-  dict.GetString("role", &role_value);
+  dict.GetString("internalRole", &role_value);
   WriteAttribute(true, base::UTF16ToUTF8(role_value), &line);
 
   for (int state_index = ui::AX_STATE_NONE;
        state_index <= ui::AX_STATE_LAST;
        ++state_index) {
     auto state = static_cast<ui::AXState>(state_index);
     const base::Value* value;
     if (!dict.Get(ui::ToString(state), &value))
       continue;
 
@@ skipping 84 matching lines @@
 
 const std::string AccessibilityTreeFormatterBlink::GetAllowString() {
   return "@BLINK-ALLOW:";
 }
 
 const std::string AccessibilityTreeFormatterBlink::GetDenyString() {
   return "@BLINK-DENY:";
 }
 
 }  // namespace content