Moved JsonPrefStore to use SequencedWorkerPool

chrome/service/service_process.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/service/service_process.h"
 
 #include <algorithm>
 
 #include "base/basictypes.h"
 #include "base/callback.h"
@@ skipping 134 matching lines @@
   base::Thread::Options options;
   options.message_loop_type = MessageLoop::TYPE_IO;
   io_thread_.reset(new ServiceIOThread("ServiceProcess_IO"));
   file_thread_.reset(new base::Thread("ServiceProcess_File"));
   if (!io_thread_->StartWithOptions(options) ||
       !file_thread_->StartWithOptions(options)) {
     NOTREACHED();
     Teardown();
     return false;
   }
+  blocking_pool_ = new base::SequencedWorkerPool(3, "ServiceBlocking");
 
   request_context_getter_ = new ServiceURLRequestContextGetter();
 
   FilePath user_data_dir;
   PathService::Get(chrome::DIR_USER_DATA, &user_data_dir);
   FilePath pref_path = user_data_dir.Append(chrome::kServiceStateFileName);
   service_prefs_.reset(
-      new ServiceProcessPrefs(pref_path, file_thread_->message_loop_proxy()));
+      new ServiceProcessPrefs(pref_path, blocking_pool_));
   service_prefs_->ReadPrefs();
 
   // Check if a locale override has been specified on the command-line.
   std::string locale = command_line.GetSwitchValueASCII(switches::kLang);
   if (!locale.empty()) {
     service_prefs_->SetString(prefs::kApplicationLocale, locale);
     service_prefs_->WritePrefs();
   } else {
     // If no command-line value was specified, read the last used locale from
     // the prefs.
@@ skipping 38 matching lines @@
 bool ServiceProcess::Teardown() {
   service_prefs_.reset();
   cloud_print_proxy_.reset();
 
   ipc_server_.reset();
   // Signal this event before shutting down the service process. That way all
   // background threads can cleanup.
   shutdown_event_.Signal();
   io_thread_.reset();
   file_thread_.reset();
+
+  if (blocking_pool_.get()) {
+    blocking_pool_->Shutdown();
+    blocking_pool_ = NULL;
+  }
+
   // The NetworkChangeNotifier must be destroyed after all other threads that
   // might use it have been shut down.
   network_change_notifier_.reset();
 
   service_process_state_->SignalStopped();
   return true;
 }
 
 // This method is called when a shutdown command is received from IPC channel
 // or there was an error in the IPC channel.
@@ skipping 119 matching lines @@
   if (enabled_services_ && !ipc_server_->is_client_connected()) {
     GetCloudPrintProxy()->CheckCloudPrintProxyPolicy();
   }
   ScheduleCloudPrintPolicyCheck();
 }
 
 ServiceProcess::~ServiceProcess() {
   Teardown();
   g_service_process = NULL;
 }