Run the later parts of startup as UI thread tasks

content/browser/browser_main.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 "content/browser/browser_main.h"
 
 #include "base/debug/trace_event.h"
 #include "content/common/content_constants_internal.h"
 #include "content/public/browser/browser_main_runner.h"
 
 namespace content {
 
 // Main routine for running as the Browser process.
 int BrowserMain(const MainFunctionParams& parameters) {
   TRACE_EVENT_BEGIN_ETW("BrowserMain", 0, "");
   base::debug::TraceLog::GetInstance()->SetProcessName("Browser");
   base::debug::TraceLog::GetInstance()->SetProcessSortIndex(
       kTraceEventBrowserProcessSortIndex);
 
   scoped_ptr<BrowserMainRunner> main_runner(BrowserMainRunner::Create());
 
-  int exit_code = main_runner->Initialize(parameters);
+  scoped_refptr<content::StartupTaskRunner> startup_task_runner =
+      make_scoped_refptr(new content::StartupTaskRunner(
+          content::StartupTaskRunner::IMMEDIATE, NULL));
+
+  int exit_code = main_runner->Initialize(parameters, startup_task_runner);
   if (exit_code >= 0)
     return exit_code;
 
   exit_code = main_runner->Run();
 
   main_runner->Shutdown();
 
   TRACE_EVENT_END_ETW("BrowserMain", 0, 0);
 
   return exit_code;
 }
 
 }  // namespace content