Add "sidebar" section to extension manifest:...

chrome/browser/sidebar/sidebar_manager.h

 // Copyright (c) 2010 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_SIDEBAR_SIDEBAR_MANAGER_H_
 #define CHROME_BROWSER_SIDEBAR_SIDEBAR_MANAGER_H_
 
 #include <map>
 #include <string>
 
@@ skipping 56 matching lines @@
 
   // Collapses sidebar identified by |tab| and |content_id| (has no effect
   // if sidebar is not expanded).
   void CollapseSidebar(TabContents* tab, const std::string& content_id);
 
   // Hides sidebar identified by |tab| and |content_id| (removes sidebar's
   // mini tab).
   void HideSidebar(TabContents* tab, const std::string& content_id);
 
   // Navigates sidebar identified by |tab| and |content_id| to |url|.
-  void NavigateSidebar(TabContents* tab, const std::string& content_id,
+  void NavigateSidebar(TabContents* tab,
+                       const std::string& content_id,
                        const GURL& url);
 
   // Changes sidebar's badge text (displayed on the mini tab).
-  void SetSidebarBadgeText(TabContents* tab, const std::string& content_id,
+  void SetSidebarBadgeText(TabContents* tab,
+                           const std::string& content_id,
                            const string16& badge_text);
 
   // Changes sidebar's icon (displayed on the mini tab).
-  void SetSidebarIcon(TabContents* tab, const std::string& content_id,
+  void SetSidebarIcon(TabContents* tab,
+                      const std::string& content_id,
                       const SkBitmap& bitmap);
 
   // Changes sidebar's title (mini tab's tooltip).
-  void SetSidebarTitle(TabContents* tab, const std::string& content_id,
+  void SetSidebarTitle(TabContents* tab,
+                       const std::string& content_id,
                        const string16& title);
 
  private:
   friend class base::RefCounted<SidebarManager>;
 
   virtual ~SidebarManager();
 
   // Overridden from NotificationObserver.
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
@@ skipping 39 matching lines @@
   TabToSidebarHostMap tab_to_sidebar_host_;
 
   typedef std::map<SidebarContainer*, TabContents*> SidebarHostToTabMap;
   SidebarHostToTabMap sidebar_host_to_tab_;
 
   DISALLOW_COPY_AND_ASSIGN(SidebarManager);
 };
 
 #endif  // CHROME_BROWSER_SIDEBAR_SIDEBAR_MANAGER_H_