Revert of Remove SequencedWorkerPool::GetNamedSequenceToken from content::CreateFileSystemContext.

content/browser/fileapi/browser_file_system_helper.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/fileapi/browser_file_system_helper.h"
 
 #include <stddef.h>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/sequenced_task_runner.h"
 #include "base/strings/utf_string_conversions.h"
-#include "base/task_scheduler/post_task.h"
+#include "base/threading/sequenced_worker_pool.h"
 #include "content/browser/child_process_security_policy_impl.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/child_process_security_policy.h"
 #include "content/public/browser/content_browser_client.h"
 #include "content/public/common/content_client.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/drop_data.h"
 #include "content/public/common/url_constants.h"
 #include "net/base/filename_util.h"
@@ skipping 29 matching lines @@
   return FileSystemOptions(profile_mode, additional_allowed_schemes, NULL);
 }
 
 }  // namespace
 
 scoped_refptr<storage::FileSystemContext> CreateFileSystemContext(
     BrowserContext* browser_context,
     const base::FilePath& profile_path,
     bool is_incognito,
     storage::QuotaManagerProxy* quota_manager_proxy) {
+  base::SequencedWorkerPool* pool = BrowserThread::GetBlockingPool();
+  scoped_refptr<base::SequencedTaskRunner> file_task_runner =
+      pool->GetSequencedTaskRunnerWithShutdownBehavior(
+          pool->GetNamedSequenceToken("FileAPI"),
+          base::SequencedWorkerPool::SKIP_ON_SHUTDOWN);
+
   // Setting up additional filesystem backends.
   std::vector<std::unique_ptr<storage::FileSystemBackend>> additional_backends;
   GetContentClient()->browser()->GetAdditionalFileSystemBackends(
       browser_context,
       profile_path,
       &additional_backends);
 
   // Set up the auto mount handlers for url requests.
   std::vector<storage::URLRequestAutoMountHandler>
       url_request_auto_mount_handlers;
   GetContentClient()->browser()->GetURLRequestAutoMountHandlers(
       &url_request_auto_mount_handlers);
 
   scoped_refptr<storage::FileSystemContext> file_system_context =
       new storage::FileSystemContext(
           BrowserThread::GetTaskRunnerForThread(BrowserThread::IO).get(),
-          base::CreateSequencedTaskRunnerWithTraits(
-              {base::MayBlock(), base::TaskPriority::BACKGROUND,
-               base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN})
-              .get(),
+          file_task_runner.get(),
           BrowserContext::GetMountPoints(browser_context),
           browser_context->GetSpecialStoragePolicy(), quota_manager_proxy,
           std::move(additional_backends), url_request_auto_mount_handlers,
           profile_path, CreateBrowserFileSystemOptions(is_incognito));
 
   std::vector<storage::FileSystemType> types;
   file_system_context->GetFileSystemTypes(&types);
   for (size_t i = 0; i < types.size(); ++i) {
     ChildProcessSecurityPolicyImpl::GetInstance()
         ->RegisterFileSystemPermissionPolicy(
@@ skipping 115 matching lines @@
     // different from the receiver's.
     file_system_file.url =
         GURL(storage::GetIsolatedFileSystemRootURIString(
                  file_system_url.origin(), filesystem_id, std::string())
                  .append(register_name));
     file_system_file.filesystem_id = filesystem_id;
   }
 }
 
 }  // namespace content