Observe OnExtensionLoaded to trigger update of chrome.commands keybindings for component extensions.

chrome/browser/extensions/api/commands/command_service.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_API_COMMANDS_COMMAND_SERVICE_H_
 #define CHROME_BROWSER_EXTENSIONS_API_COMMANDS_COMMAND_SERVICE_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 183 matching lines @@
 
   // ExtensionRegistryObserver.
   void OnExtensionWillBeInstalled(content::BrowserContext* browser_context,
                                   const Extension* extension,
                                   bool is_update,
                                   bool from_ephemeral,
                                   const std::string& old_name) override;
   void OnExtensionUninstalled(content::BrowserContext* browser_context,
                               const Extension* extension,
                               extensions::UninstallReason reason) override;
+  void OnExtensionLoaded(content::BrowserContext* browser_context,
+                         const Extension* extension) override;
 
   // Updates keybindings for a given |extension|'s page action, browser action
   // and named commands. Assigns new keybindings and removes relinquished
   // keybindings if not changed by the user. In the case of adding keybindings,
   // if the suggested keybinding is free, it will be taken by this extension. If
   // not, the keybinding request is ignored.
   void UpdateKeybindings(const Extension* extension);
 
   // On update, removes keybindings that the extension previously suggested but
   // now no longer does, as long as the user has not modified them.
@@ skipping 46 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(CommandService);
 };
 
 template <>
 void
     BrowserContextKeyedAPIFactory<CommandService>::DeclareFactoryDependencies();
 
 }  //  namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_COMMANDS_COMMAND_SERVICE_H_