Relanding the language detection.

chrome/browser/tab_contents/navigation_entry.h

 // Copyright (c) 2006-2008 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.
 
 #ifndef CHROME_BROWSER_TAB_CONTENTS_NAVIGATION_ENTRY_H_
 #define CHROME_BROWSER_TAB_CONTENTS_NAVIGATION_ENTRY_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 371 matching lines @@
 
   // The RestoreType for this entry. This is set if the entry was retored. This
   // is set to RESTORE_NONE once the entry is loaded.
   void set_restore_type(RestoreType type) {
     restore_type_ = type;
   }
   RestoreType restore_type() const {
     return restore_type_;
   }
 
+  // The ISO 639-1 language code (ex: en, fr, zh...) for the page.
+  // Can be empty if the language was not detected yet or is unknown.
+  void set_language(const std::string& language) {
+    language_ = language;
+  }
+  std::string language() const {
+    return language_;
+  }
+
  private:
   // WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
   // Session/Tab restore save portions of this class so that it can be recreated
   // later. If you add a new field that needs to be persisted you'll have to
   // update SessionService/TabRestoreService appropriately.
   // WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
 
   // See the accessors above for descriptions.
   int unique_id_;
   scoped_refptr<SiteInstance> site_instance_;
   PageType page_type_;
   GURL url_;
   GURL referrer_;
   GURL virtual_url_;
   bool update_virtual_url_with_url_;
   string16 title_;
   FaviconStatus favicon_;
   std::string content_state_;
   int32 page_id_;
   SSLStatus ssl_;
   PageTransition::Type transition_type_;
   GURL user_typed_url_;
   bool has_post_data_;
   RestoreType restore_type_;
+  std::string language_;  // ISO 639-1 language code.
 
   // This is a cached version of the result of GetTitleForDisplay. It prevents
   // us from having to do URL formatting on the URL evey time the title is
   // displayed. When the URL, virtual URL, or title is set, this should be
   // cleared to force a refresh.
   string16 cached_display_title_;
 
   // Copy and assignment is explicitly allowed for this class.
 };
 
 #endif  // CHROME_BROWSER_TAB_CONTENTS_NAVIGATION_ENTRY_H_