This defers starting background extension page RenderViews

chrome/browser/ui/startup/startup_browser_creator_impl.cc

 // 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.
 
 #include "chrome/browser/ui/startup/startup_browser_creator_impl.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "apps/app_restore_service.h"
@@ skipping 14 matching lines @@
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/thread_restrictions.h"
 #include "chrome/browser/auto_launch_trial.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/custom_handlers/protocol_handler_registry.h"
 #include "chrome/browser/custom_handlers/protocol_handler_registry_factory.h"
 #include "chrome/browser/defaults.h"
 #include "chrome/browser/extensions/extension_creator.h"
 #include "chrome/browser/extensions/extension_service.h"
+#include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/extensions/pack_extension_job.h"
 #include "chrome/browser/first_run/first_run.h"
 #include "chrome/browser/google/google_util.h"
 #include "chrome/browser/infobars/infobar_service.h"
 #include "chrome/browser/net/predictor.h"
 #include "chrome/browser/notifications/desktop_notification_service.h"
 #include "chrome/browser/performance_monitor/startup_timer.h"
 #include "chrome/browser/prefs/incognito_mode_prefs.h"
 #include "chrome/browser/prefs/session_startup_pref.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 337 matching lines @@
       KeystoneInfoBar::PromotionInfoBar(profile);
     }
 #endif
   }
 
 #if defined(OS_WIN)
   if (process_startup)
     ShellIntegration::MigrateChromiumShortcuts();
 #endif  // defined(OS_WIN)
 
+  // If we deferred creation of background extension hosts, we want to create
+  // them now that the session (if any) has been restored.
+  ExtensionProcessManager* process_manager =
+      extensions::ExtensionSystem::Get(profile)->process_manager();
+  process_manager->DeferBackgroundHostCreation(false);
+
   return true;
 }
 
 void StartupBrowserCreatorImpl::ExtractOptionalAppWindowSize(
     gfx::Rect* bounds) {
   if (command_line_.HasSwitch(switches::kAppWindowSize)) {
     int width, height;
     width = height = 0;
     std::string switch_value =
         command_line_.GetSwitchValueASCII(switches::kAppWindowSize);
@@ skipping 552 matching lines @@
 }
 
 #if !defined(OS_WIN)
 // static
 bool StartupBrowserCreatorImpl::OpenStartupURLsInExistingBrowser(
     Profile* profile,
     const std::vector<GURL>& startup_urls) {
   return false;
 }
 #endif