Use TaskScheduler instead of blocking pool in user_policy_manager_factory_chromeos.cc.

chrome/browser/chromeos/policy/user_policy_manager_factory_chromeos.cc

 // Copyright (c) 2013 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/chromeos/policy/user_policy_manager_factory_chromeos.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/path_service.h"
 #include "base/sequenced_task_runner.h"
-#include "base/threading/sequenced_worker_pool.h"
+#include "base/task_scheduler/post_task.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/time/time.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chromeos/policy/active_directory_policy_manager.h"
 #include "chrome/browser/chromeos/policy/browser_policy_connector_chromeos.h"
 #include "chrome/browser/chromeos/policy/user_cloud_external_data_manager.h"
 #include "chrome/browser/chromeos/policy/user_cloud_policy_manager_chromeos.h"
 #include "chrome/browser/chromeos/policy/user_cloud_policy_store_chromeos.h"
 #include "chrome/browser/chromeos/profiles/profile_helper.h"
 #include "chrome/browser/chromeos/settings/cros_settings.h"
@@ skipping 205 matching lines @@
   CHECK(PathService::Get(chromeos::DIR_USER_POLICY_KEYS, &policy_key_dir));
 
   std::unique_ptr<UserCloudPolicyStoreChromeOS> store =
       base::MakeUnique<UserCloudPolicyStoreChromeOS>(
           chromeos::DBusThreadManager::Get()->GetCryptohomeClient(),
           chromeos::DBusThreadManager::Get()->GetSessionManagerClient(),
           background_task_runner, account_id, policy_key_dir,
           is_active_directory);
 
   scoped_refptr<base::SequencedTaskRunner> backend_task_runner =
-      content::BrowserThread::GetBlockingPool()->GetSequencedTaskRunner(
-          content::BrowserThread::GetBlockingPool()->GetSequenceToken());
+      base::CreateSequencedTaskRunnerWithTraits(
+          base::TaskTraits().MayBlock().WithPriority(
+              base::TaskPriority::BACKGROUND));

[Thiemo Nagel, 2017/04/27 09:44:52]

I think we should SKIP_ON_SHUTDOWN.  From what I can see, no data is lost if we
drop something on the floor as we can always re-fetch during the next session.

[fdoray, 2017/04/27 13:27:21]

Done.

   scoped_refptr<base::SequencedTaskRunner> io_task_runner =
       content::BrowserThread::GetTaskRunnerForThread(
           content::BrowserThread::IO);
   std::unique_ptr<CloudExternalDataManager> external_data_manager(
       new UserCloudExternalDataManager(base::Bind(&GetChromePolicyDetails),
                                        backend_task_runner, io_task_runner,
                                        external_data_dir, store.get()));
   if (force_immediate_load)
     store->LoadImmediately();
 
@@ skipping 67 matching lines @@
 
 bool UserPolicyManagerFactoryChromeOS::HasTestingFactory(
     content::BrowserContext* context) {
   return false;
 }
 
 void UserPolicyManagerFactoryChromeOS::CreateServiceNow(
     content::BrowserContext* context) {}
 
 }  // namespace policy