Expose the level of headings to NVDA....

chrome/browser/browser_accessibility_win.cc

 // Copyright (c) 2010 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 "chrome/browser/browser_accessibility_win.h"
 
 #include "base/logging.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/browser_accessibility_manager_win.h"
@@ skipping 28 matching lines @@
   index_in_parent_ = index_in_parent;
 
   renderer_id_ = src.id;
   name_ = src.name;
   value_ = src.value;
   attributes_ = src.attributes;
   html_attributes_ = src.html_attributes;
   location_ = src.location;
   InitRoleAndState(src.role, src.state);
 
+  // Expose headings levels to NVDA with the "level" object attribute.
+  if (src.role == WebAccessibility::ROLE_HEADING && role_name_.size() == 2 &&
+          IsAsciiDigit(role_name_[1])) {
+    html_attributes_.push_back(std::make_pair(L"level", role_name_.substr(1)));
+  }
+
   // If this object doesn't have a name but it does have a description,
   // use the description as its name - because some screen readers only
   // announce the name.
   if (name_.empty() && HasAttribute(WebAccessibility::ATTR_DESCRIPTION)) {
     GetAttribute(WebAccessibility::ATTR_DESCRIPTION, &name_);
   }
 
   instance_active_ = true;
 }
 
@@ skipping 1299 matching lines @@
   }
 
   // The role should always be set.
   DCHECK(!role_name_.empty() || role_);
 
   // If we didn't explicitly set the IAccessible2 role, make it the same
   // as the MSAA role.
   if (!ia2_role_)
     ia2_role_ = role_;
 }