This defers starting background extension page RenderViews

chrome/browser/extensions/extension_system.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/extensions/extension_system.h"
 
 #include "base/base_switches.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
@@ skipping 284 matching lines @@
   }
 }
 
 ExtensionSystemImpl::~ExtensionSystemImpl() {
 }
 
 void ExtensionSystemImpl::Shutdown() {
   extension_process_manager_.reset();
 }
 
-void ExtensionSystemImpl::InitForRegularProfile(bool extensions_enabled) {
+void ExtensionSystemImpl::InitForRegularProfile(
+    bool extensions_enabled,
+    bool defer_background_creation) {
   DCHECK(!profile_->IsOffTheRecord());
   if (user_script_master() || extension_service())
     return;  // Already initialized.
 
   // The ExtensionInfoMap needs to be created before the
   // ExtensionProcessManager.
   shared_->info_map();
 
   extension_process_manager_.reset(ExtensionProcessManager::Create(profile_));
 
+  extension_process_manager_->DeferBackgroundHostCreation(
+      defer_background_creation);
+
   shared_->Init(extensions_enabled);
 }
 
 ExtensionService* ExtensionSystemImpl::extension_service() {
   return shared_->extension_service();
 }
 
 ManagementPolicy* ExtensionSystemImpl::management_policy() {
   return shared_->management_policy();
 }
@@ skipping 61 matching lines @@
 void ExtensionSystemImpl::UnregisterExtensionWithRequestContexts(
     const std::string& extension_id,
     const extension_misc::UnloadedExtensionReason reason) {
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       base::Bind(&ExtensionInfoMap::RemoveExtension, info_map(),
                  extension_id, reason));
 }
 
 }  // namespace extensions