Delay some extension startup until after first run import.

chrome/browser/extensions/extension_service.h

 // Copyright (c) 2011 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_SERVICE_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_H_
 #pragma once
 
 #include <list>
 #include <map>
@@ skipping 264 matching lines @@
   // TODO(mpcomplete): remove. http://crbug.com/100411
   bool HasUsedWebRequest(const Extension* extension);
   void SetHasUsedWebRequest(const Extension* extension, bool value);
 
   // Getter for the extension's runtime data PropertyBag.
   base::PropertyBag* GetPropertyBag(const Extension* extension);
 
   // Initialize and start all installed extensions.
   void Init();
 
-  // Initialize the event routers after import has finished.
+  // To delay some initialization until after import has finished, register
+  // for the notification.
+  // TODO(yoz): remove InitEventRoutersAterImport.
   void InitEventRoutersAfterImport();
+  void RegisterForImportFinished();
+
+  // Complete some initialization after being notified that import has finished.
+  void InitAfterImport();
 
   // Start up the extension event routers.
   void InitEventRouters();
 
   // Look up an extension by ID.  Does not include terminated
   // extensions.
   virtual const Extension* GetExtensionById(
       const std::string& id, bool include_disabled) const OVERRIDE;
 
   // Looks up a terminated (crashed) extension by ID.
@@ skipping 557 matching lines @@
   ImageLoadingTracker tracker_;
 
   FRIEND_TEST_ALL_PREFIXES(ExtensionServiceTest,
                            InstallAppsWithUnlimtedStorage);
   FRIEND_TEST_ALL_PREFIXES(ExtensionServiceTest,
                            InstallAppsAndCheckStorageProtection);
   DISALLOW_COPY_AND_ASSIGN(ExtensionService);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_H_