Implement navigator.languages.

Source/core/frame/NavigatorLanguage.cpp

 // 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 "config.h"
 #include "core/frame/NavigatorLanguage.h"
 
 #include "platform/Language.h"
 
 namespace WebCore {
 
+NavigatorLanguage::NavigatorLanguage()
+    : m_languagesChanged(true)
+{
+}
+
 AtomicString NavigatorLanguage::language(bool& isNull)
 {
     isNull = false;
     return defaultLanguage();
 }
 
+bool NavigatorLanguage::hasLanguagesChanged()
+{
+    if (!m_languagesChanged)
+        return false;
+
+    m_languagesChanged = false;
+    return true;
+}
+
+void NavigatorLanguage::setLanguagesChanged()
+{
+    m_languagesChanged = true;
+}
+
 } // namespace WebCore