Use TaskScheduler instead of WorkerPool in x11_hotplug_event_handler.cc.

ui/events/platform/x11/x11_hotplug_event_handler.cc

 // Copyright 2014 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 "ui/events/platform/x11/x11_hotplug_event_handler.h"
 
 #include <stdint.h>
 #include <X11/extensions/XInput.h>
 #include <X11/extensions/XInput2.h>
 #include <X11/Xatom.h>
 
 #include <algorithm>
 #include <cmath>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/process/launch.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/string_util.h"
 #include "base/sys_info.h"
+#include "base/task_scheduler/post_task.h"
 #include "base/threading/thread_task_runner_handle.h"
-#include "base/threading/worker_pool.h"
 #include "ui/events/devices/device_data_manager.h"
 #include "ui/events/devices/device_hotplug_event_observer.h"
 #include "ui/events/devices/device_util_linux.h"
 #include "ui/events/devices/input_device.h"
 #include "ui/events/devices/touchscreen_device.h"
 #include "ui/gfx/x/x11_types.h"
 
 #ifndef XI_PROP_PRODUCT_ID
 #define XI_PROP_PRODUCT_ID "Device Product ID"
 #endif
@@ skipping 448 matching lines @@
   display_state.mt_position_x = atom_cache_.GetAtom("Abs MT Position X");
   display_state.mt_position_y = atom_cache_.GetAtom("Abs MT Position Y");
 
   UiCallbacks callbacks;
   callbacks.keyboard_callback = base::Bind(&OnKeyboardDevices);
   callbacks.touchscreen_callback = base::Bind(&OnTouchscreenDevices);
   callbacks.mouse_callback = base::Bind(&OnMouseDevices);
   callbacks.touchpad_callback = base::Bind(&OnTouchpadDevices);
   callbacks.hotplug_finished_callback = base::Bind(&OnHotplugFinished);
 
-  // Parsing the device information may block, so delegate the operation to a
-  // worker thread. Once the device information is extracted the parsed devices
-  // will be returned via the callbacks.
-  base::WorkerPool::PostTask(
+  // Parse the device information asynchronously since this operation may block.
+  // Once the device information is extracted the parsed devices will be
+  // returned via the callbacks.
+  base::PostTaskWithTraits(
       FROM_HERE,
-      base::Bind(&HandleHotplugEventInWorker, device_infos, display_state,
-                 base::ThreadTaskRunnerHandle::Get(), callbacks),
-      true /* task_is_slow */);
+      {base::MayBlock(), base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN},
+      base::BindOnce(&HandleHotplugEventInWorker, device_infos, display_state,
+                     base::ThreadTaskRunnerHandle::Get(), callbacks));
 }
 
 }  // namespace ui