Create a secondary file thread, FILE_USER_BLOCKING...

content/browser/browser_main_loop.cc

 // 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.
 
 #include "content/browser/browser_main_loop.h"
 
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
@@ skipping 304 matching lines @@
     base::Thread::Options* options = &default_options;
 
     switch (thread_id) {
       case BrowserThread::DB:
         thread_to_start = &db_thread_;
         break;
       case BrowserThread::WEBKIT:
         // Special case as WebKitThread is a separate
         // type.  |thread_to_start| is not used in this case.
         break;
+      case BrowserThread::FILE_USER_BLOCKING:
+        thread_to_start = &file_user_blocking_thread_;
+        break;
       case BrowserThread::FILE:
         thread_to_start = &file_thread_;
 #if defined(OS_WIN)
         // On Windows, the FILE thread needs to be have a UI message loop
         // which pumps messages in such a way that Google Update can
         // communicate back to us.
         options = &ui_message_loop_options;
 #else
         options = &io_message_loop_options;
 #endif
@@ skipping 106 matching lines @@
     // - (Not sure why DB stops last.)
     scoped_ptr<BrowserProcessSubThread>* thread_to_stop = NULL;
     switch (thread_id) {
       case BrowserThread::DB:
         thread_to_stop = &db_thread_;
         break;
       case BrowserThread::WEBKIT:
         // Special case as WebKitThread is a separate
         // type.  |thread_to_stop| is not used in this case.
         break;
+      case BrowserThread::FILE_USER_BLOCKING:
+        thread_to_stop = &file_user_blocking_thread_;
+        break;
       case BrowserThread::FILE:
         thread_to_stop = &file_thread_;
         break;
       case BrowserThread::PROCESS_LAUNCHER:
         thread_to_stop = &process_launcher_thread_;
         break;
       case BrowserThread::CACHE:
         thread_to_stop = &cache_thread_;
         break;
       case BrowserThread::IO:
@@ skipping 87 matching lines @@
     MessageLoopForUI::current()->PostTask(FROM_HERE, parameters_.ui_task);
 
 #if defined(OS_MACOSX)
   MessageLoopForUI::current()->Run();
 #else
   MessageLoopForUI::current()->RunWithDispatcher(NULL);
 #endif
 }
 
 }  // namespace content