Name TaskScheduler's worker threads

base/task_scheduler/task_scheduler_impl.cc

Index: base/task_scheduler/task_scheduler_impl.cc
diff --git a/base/task_scheduler/task_scheduler_impl.cc b/base/task_scheduler/task_scheduler_impl.cc
index ca6c78d1524341512aac43f67fc3e9e19f2b9f48..c7631305c4bf80d76639855831151911fec2ada6 100644
--- a/base/task_scheduler/task_scheduler_impl.cc
+++ b/base/task_scheduler/task_scheduler_impl.cc
@@ -90,23 +90,27 @@ void TaskSchedulerImpl::Initialize() {
   // SchedulerThreadPoolImpl::Create() is safe because a TaskSchedulerImpl can't
   // be deleted before all its thread pools have been joined.
   background_thread_pool_ = SchedulerThreadPoolImpl::Create(
-      ThreadPriority::BACKGROUND, 1u, IORestriction::DISALLOWED,
-      re_enqueue_sequence_callback, &task_tracker_, &delayed_task_manager_);
+      "TaskSchedulerBackground", ThreadPriority::BACKGROUND, 1u,
+      IORestriction::DISALLOWED, re_enqueue_sequence_callback, &task_tracker_,
+      &delayed_task_manager_);
   CHECK(background_thread_pool_);
 
   background_file_io_thread_pool_ = SchedulerThreadPoolImpl::Create(
-      ThreadPriority::BACKGROUND, 1u, IORestriction::ALLOWED,
-      re_enqueue_sequence_callback, &task_tracker_, &delayed_task_manager_);
+      "TaskSchedulerBackgroundFileIO", ThreadPriority::BACKGROUND, 1u,
+      IORestriction::ALLOWED, re_enqueue_sequence_callback, &task_tracker_,
+      &delayed_task_manager_);
   CHECK(background_file_io_thread_pool_);
 
   normal_thread_pool_ = SchedulerThreadPoolImpl::Create(
-      ThreadPriority::NORMAL, 4u, IORestriction::DISALLOWED,
-      re_enqueue_sequence_callback, &task_tracker_, &delayed_task_manager_);
+      "TaskSchedulerForeground", ThreadPriority::NORMAL, 4u,
+      IORestriction::DISALLOWED, re_enqueue_sequence_callback, &task_tracker_,
+      &delayed_task_manager_);
   CHECK(normal_thread_pool_);
 
   normal_file_io_thread_pool_ = SchedulerThreadPoolImpl::Create(
-      ThreadPriority::NORMAL, 12u, IORestriction::ALLOWED,
-      re_enqueue_sequence_callback, &task_tracker_, &delayed_task_manager_);
+      "TaskSchedulerForegroundFileIO", ThreadPriority::NORMAL, 12u,
+      IORestriction::ALLOWED, re_enqueue_sequence_callback, &task_tracker_,
+      &delayed_task_manager_);
   CHECK(normal_file_io_thread_pool_);
 }