[chromium-reviews] Add getLanguage function to tabs extension

chrome/browser/extensions/extension_tabs_module.h

 // Copyright (c) 2009 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_EXTENSIONS_EXTENSION_TABS_MODULE_H__
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_TABS_MODULE_H__
 
 #include <string>
 
 #include "chrome/browser/extensions/extension_function.h"
+#include "chrome/common/notification_service.h"
+#include "chrome/common/notification_registrar.h"
 
 class Browser;
 class DictionaryValue;
 class TabContents;
 class TabStripModel;
 
 class ExtensionTabUtil {
  public:
   // Possible tab states.  These states are used to calculate the "status"
   // property of the Tab object that is used in the extension tab API.
@@ skipping 58 matching lines @@
 };
 class UpdateTabFunction : public SyncExtensionFunction {
   virtual bool RunImpl();
 };
 class MoveTabFunction : public SyncExtensionFunction {
   virtual bool RunImpl();
 };
 class RemoveTabFunction : public SyncExtensionFunction {
   virtual bool RunImpl();
 };
+class GetTabLanguageFunction : public AsyncExtensionFunction,
+                               public NotificationObserver {
+  virtual bool RunImpl();
+
+ private:
+  virtual void Observe(NotificationType type,
+                       const NotificationSource& source,
+                       const NotificationDetails& details);
+  NotificationRegistrar registrar_;
+};
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_TABS_MODULE_H__