Use TaskScheduler instead of WorkerPool in print_job.cc.

chrome/browser/printing/print_job.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/browser/printing/print_job.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/location.h"
 #include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
+#include "base/task_scheduler/post_task.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/threading/thread_task_runner_handle.h"
-#include "base/threading/worker_pool.h"
 #include "build/build_config.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/printing/print_job_worker.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_service.h"
 #include "printing/printed_document.h"
 #include "printing/printed_page.h"
 
 #if defined(OS_WIN)
 #include "chrome/browser/printing/pdf_to_emf_converter.h"
@@ skipping 406 matching lines @@
   // Delay shutdown until the worker terminates.  We want this code path
   // to wait on the thread to quit before continuing.
   if (worker_->IsRunning()) {
     base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
         FROM_HERE, base::Bind(&PrintJob::ControlledWorkerShutdown, this),
         base::TimeDelta::FromMilliseconds(100));
     return;
   }
 #endif
 
-
   // Now make sure the thread object is cleaned up. Do this on a worker
   // thread because it may block.
-  base::WorkerPool::PostTaskAndReply(
+  // TODO(fdoray): Remove MayBlock() once base::Thread::Stop() passes
+  // base::ThreadRestrictions::AssertWaitAllowed().
+  base::PostTaskWithTraitsAndReply(
       FROM_HERE,
+      base::TaskTraits()
+          .MayBlock()
+          .WithBaseSyncPrimitives()
+          .WithPriority(base::TaskPriority::BACKGROUND)
+          .WithShutdownBehavior(
+              base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN),
       base::BindOnce(&PrintJobWorker::Stop, base::Unretained(worker_.get())),
-      base::BindOnce(&PrintJob::HoldUntilStopIsCalled, this), false);
+      base::BindOnce(&PrintJob::HoldUntilStopIsCalled, this));
 
   is_job_pending_ = false;
   registrar_.RemoveAll();
   UpdatePrintedDocument(nullptr);
 }
 
 void PrintJob::HoldUntilStopIsCalled() {
 }
 
 void PrintJob::Quit() {
   base::MessageLoop::current()->QuitWhenIdle();
 }
 
 // Takes settings_ ownership and will be deleted in the receiving thread.
 JobEventDetails::JobEventDetails(Type type,
                                  int job_id,
                                  PrintedDocument* document,
                                  PrintedPage* page)
     : document_(document), page_(page), type_(type), job_id_(job_id) {}
 
 JobEventDetails::~JobEventDetails() {
 }
 
 PrintedDocument* JobEventDetails::document() const { return document_.get(); }
 
 PrintedPage* JobEventDetails::page() const { return page_.get(); }
 
 }  // namespace printing