Hook up the SequencedWorkerPool to the browser thread.

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 478 matching lines @@
     } else if (thread_to_stop) {
       thread_to_stop->reset();
     } else {
       NOTREACHED();
     }
 
     if (parts_.get())
       parts_->PostStopThread(id);
   }
 
+  // Close the blocking I/O pool after the other threads. Other threads such
+  // as the I/O thread may need to schedule work like closing files or flushing
+  // data during shutdown, so the blocking pool needs to be available. There
+  // may also be slow operations pending that will blcok shutdown, so closing
+  // it here (which will block until required operations are complete) gives
+  // more head start for those operations to finish.
+  BrowserThreadImpl::ShutdownThreadPool();
+
   if (parts_.get())
     parts_->PostDestroyThreads();
 }
 
 void BrowserMainLoop::InitializeMainThread() {
   const char* kThreadName = "CrBrowserMain";
   base::PlatformThread::SetName(kThreadName);
   main_message_loop_->set_thread_name(kThreadName);
 
   // Register the main thread by instantiating it, but don't call any methods.
@@ skipping 50 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