This defers starting background extension page RenderViews

chrome/browser/extensions/extension_system.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_SYSTEM_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_SYSTEM_H_
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
@@ skipping 34 matching lines @@
 
   // Returns the instance for the given profile, or NULL if none. This is
   // a convenience wrapper around ExtensionSystemFactory::GetForProfile.
   static ExtensionSystem* Get(Profile* profile);
 
   // BrowserContextKeyedService implementation.
   virtual void Shutdown() OVERRIDE {}
 
   // Initializes extensions machinery.
   // Component extensions are always enabled, external and user extensions
-  // are controlled by |extensions_enabled|.
-  virtual void InitForRegularProfile(bool extensions_enabled) = 0;
+  // are controlled by |extensions_enabled|.  If |defer_background_creation| is
+  // true, then background extension RenderViews will be deferred until
+  // ExtensionProcessManager::CreateDeferredBackgroundHosts is called.
+  virtual void InitForRegularProfile(bool extensions_enabled,
+                                     bool defer_background_creation) = 0;
 
   // The ExtensionService is created at startup.
   virtual ExtensionService* extension_service() = 0;
 
   // The class controlling whether users are permitted to perform certain
   // actions on extensions (install, uninstall, disable, etc.).
   // The ManagementPolicy is created at startup.
   virtual ManagementPolicy* management_policy() = 0;
 
   // The UserScriptMaster is created at startup.
@@ skipping 51 matching lines @@
 // instances. A private Shared class (also a BrowserContextKeyedService,
 // but with a shared instance for incognito) keeps the common services.
 class ExtensionSystemImpl : public ExtensionSystem {
  public:
   explicit ExtensionSystemImpl(Profile* profile);
   virtual ~ExtensionSystemImpl();
 
   // BrowserContextKeyedService implementation.
   virtual void Shutdown() OVERRIDE;
 
-  virtual void InitForRegularProfile(bool extensions_enabled) OVERRIDE;
+  virtual void InitForRegularProfile(bool extensions_enabled,
+                                     bool defer_background_creation) OVERRIDE;
 
   virtual ExtensionService* extension_service() OVERRIDE;  // shared
   virtual ManagementPolicy* management_policy() OVERRIDE;  // shared
   virtual UserScriptMaster* user_script_master() OVERRIDE;  // shared
   virtual ExtensionProcessManager* process_manager() OVERRIDE;
   virtual StateStore* state_store() OVERRIDE;  // shared
   virtual StateStore* rules_store() OVERRIDE;  // shared
   virtual LazyBackgroundTaskQueue* lazy_background_task_queue()
       OVERRIDE;  // shared
   virtual ExtensionInfoMap* info_map() OVERRIDE;  // shared
@@ skipping 81 matching lines @@
   // incoming resource requests from extension processes and those require
   // access to the ResourceContext owned by |io_data_|.
   scoped_ptr<ExtensionProcessManager> extension_process_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionSystemImpl);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_SYSTEM_H_