Page actions behave as disableable browser actions when script badges are enabled.

chrome/browser/ui/gtk/browser_actions_toolbar_gtk.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_UI_GTK_BROWSER_ACTIONS_TOOLBAR_GTK_H_
 #define CHROME_BROWSER_UI_GTK_BROWSER_ACTIONS_TOOLBAR_GTK_H_
 
 #include <map>
 #include <string>
 
@@ skipping 42 matching lines @@
   // BrowserActions.
   GtkWidget* GetBrowserActionWidget(const extensions::Extension* extension);
 
   int button_count() { return extension_button_map_.size(); }
 
   Browser* browser() { return browser_; }
 
   ExtensionToolbarModel* model() { return model_; }
 
   // Returns the currently selected tab ID, or -1 if there is none.
-  int GetCurrentTabId();
+  int GetCurrentTabId() const;
 
   // Update the display of all buttons.
   void Update();
 
   // content::NotificationObserver implementation.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   bool animating() {
@@ skipping 149 matching lines @@
   ui::GtkSignalRegistrar signals_;
 
   content::NotificationRegistrar registrar_;
 
   base::WeakPtrFactory<BrowserActionsToolbarGtk> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserActionsToolbarGtk);
 };
 
 #endif  // CHROME_BROWSER_UI_GTK_BROWSER_ACTIONS_TOOLBAR_GTK_H_