Improve support for multiselect list box accessibility on Windows.

content/browser/accessibility/browser_accessibility.cc

 // Copyright (c) 2011 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/browser/accessibility/browser_accessibility.h"
 
 #include "base/logging.h"
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
 #include "content/browser/accessibility/browser_accessibility_manager.h"
@@ skipping 233 matching lines @@
     const string16& attr = html_attributes_[i].first;
     if (LowerCaseEqualsASCII(attr, html_attr)) {
       *value = html_attributes_[i].second;
       return true;
     }
   }
 
   return false;
 }
 
+bool BrowserAccessibility::HasState(WebAccessibility::State state_enum) const {
+  return (state_ >> state_enum) & 1;
+}
+
 bool BrowserAccessibility::IsEditableText() const {
   return (role_ == WebAccessibility::ROLE_TEXT_FIELD ||
           role_ == WebAccessibility::ROLE_TEXTAREA);
 }
 
 string16 BrowserAccessibility::GetTextRecursive() const {
   if (!name_.empty()) {
     return name_;
   }
 
   string16 result;
   for (size_t i = 0; i < children_.size(); ++i)
     result += children_[i]->GetTextRecursive();
   return result;
 }