Initial skeleton for System Indicator API

chrome/browser/extensions/extension_action_manager.h

 // Copyright (c) 2012 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_ACTION_MANAGER_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_ACTION_MANAGER_H_
 
 #include <map>
 #include <string>
 
@@ skipping 21 matching lines @@
   // shared between a profile and its incognito version.
   static ExtensionActionManager* Get(Profile* profile);
 
   // Retrieves the page action, browser action, or script badge for |extension|.
   // If the result is not NULL, it remains valid until the extension is
   // unloaded.
   ExtensionAction* GetPageAction(const extensions::Extension& extension) const;
   ExtensionAction* GetBrowserAction(
       const extensions::Extension& extension) const;
   ExtensionAction* GetScriptBadge(const extensions::Extension& extension) const;
+  ExtensionAction* GetSystemIndicator(
+      const extensions::Extension& extension) const;
 
  private:
   // Implement content::NotificationObserver.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   content::NotificationRegistrar registrar_;
 
   // Keyed by Extension ID.  These maps are populated lazily when their
   // ExtensionAction is first requested, and the entries are removed when the
   // extension is unloaded.  Not every extension has a page action or browser
   // action, but all have a script badge.
   typedef std::map<std::string, linked_ptr<ExtensionAction> > ExtIdToActionMap;
   mutable ExtIdToActionMap page_actions_;
   mutable ExtIdToActionMap browser_actions_;
   mutable ExtIdToActionMap script_badges_;
+  mutable ExtIdToActionMap system_indicators_;
 };
 
-}
+}  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_ACTION_MANAGER_H_