Make a ShowExtensionActionPopup function

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 15 matching lines @@
 class ExtensionActionManager : public KeyedService,
                                public ExtensionRegistryObserver {
  public:
   explicit ExtensionActionManager(Profile* profile);
   virtual ~ExtensionActionManager();
 
   // Returns this profile's ExtensionActionManager.  One instance is
   // shared between a profile and its incognito version.
   static ExtensionActionManager* Get(content::BrowserContext* browser_context);
 
-  // Retrieves the page action, or browser action for |extension|.
+  // Retrieves the page action, browser action, or system indicator 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* GetSystemIndicator(
-      const extensions::Extension& extension) const;
+  ExtensionAction* GetPageAction(const Extension& extension) const;
+  ExtensionAction* GetBrowserAction(const Extension& extension) const;
+  ExtensionAction* GetSystemIndicator(const Extension& extension) const;
+
+  // Returns either the PageAction or BrowserAction for |extension|, or NULL if
+  // none exists. Since an extension can only declare one of Browser|PageAction,
+  // this is okay to use anywhere you need a generic "ExtensionAction".
+  // Since SystemIndicators are used differently and don't follow this
+  // rule of mutual exclusion, they are not checked or returned.
+  ExtensionAction* GetExtensionAction(const Extension& extension) const;
 
   // Gets the best fit ExtensionAction for the given |extension|. This takes
   // into account |extension|'s browser or page actions, if any, along with its
   // name and any declared icons.
   scoped_ptr<ExtensionAction> GetBestFitAction(
-      const extensions::Extension& extension,
-      extensions::ActionInfo::Type type) const;
+      const Extension& extension, ActionInfo::Type type) const;
 
  private:
   // Implement ExtensionRegistryObserver.
   virtual void OnExtensionUnloaded(content::BrowserContext* browser_context,
                                    const Extension* extension,
                                    UnloadedExtensionInfo::Reason reason)
       OVERRIDE;
 
   Profile* profile_;
 
   // Listen to extension unloaded notifications.
   ScopedObserver<ExtensionRegistry, ExtensionRegistryObserver>
       extension_registry_observer_;
 
   // 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.
   typedef std::map<std::string, linked_ptr<ExtensionAction> > ExtIdToActionMap;
   mutable ExtIdToActionMap page_actions_;
   mutable ExtIdToActionMap browser_actions_;
   mutable ExtIdToActionMap system_indicators_;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_ACTION_MANAGER_H_