TaskScheduler: Add internal::GetTaskPriorityForCurrentThread().

base/BUILD.gn

 # 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.
 
 # HOW TO WRITE CONDITIONALS IN THIS FILE
 # ======================================
 #
 # In many other places, one would write a conditional that expresses all the
 # cases when a source file is used or unused, and then either add or subtract
 # it from the sources list in that case
@@ skipping 810 matching lines @@
     "task_scheduler/scheduler_worker_pool_params.cc",
     "task_scheduler/scheduler_worker_pool_params.h",
     "task_scheduler/scheduler_worker_stack.cc",
     "task_scheduler/scheduler_worker_stack.h",
     "task_scheduler/sequence.cc",
     "task_scheduler/sequence.h",
     "task_scheduler/sequence_sort_key.cc",
     "task_scheduler/sequence_sort_key.h",
     "task_scheduler/task.cc",
     "task_scheduler/task.h",
+    "task_scheduler/task_priority_for_current_thread.cc",
+    "task_scheduler/task_priority_for_current_thread.h",
     "task_scheduler/task_scheduler.cc",
     "task_scheduler/task_scheduler.h",
     "task_scheduler/task_scheduler_impl.cc",
     "task_scheduler/task_scheduler_impl.h",
     "task_scheduler/task_tracker.cc",
     "task_scheduler/task_tracker.h",
     "task_scheduler/task_tracker_posix.cc",
     "task_scheduler/task_tracker_posix.h",
     "task_scheduler/task_traits.cc",
     "task_scheduler/task_traits.h",
@@ skipping 1137 matching lines @@
     "task/cancelable_task_tracker_unittest.cc",
     "task_runner_util_unittest.cc",
     "task_scheduler/delayed_task_manager_unittest.cc",
     "task_scheduler/priority_queue_unittest.cc",
     "task_scheduler/scheduler_lock_unittest.cc",
     "task_scheduler/scheduler_worker_pool_impl_unittest.cc",
     "task_scheduler/scheduler_worker_stack_unittest.cc",
     "task_scheduler/scheduler_worker_unittest.cc",
     "task_scheduler/sequence_sort_key_unittest.cc",
     "task_scheduler/sequence_unittest.cc",
+    "task_scheduler/task_priority_for_current_thread_unittest.cc",
     "task_scheduler/task_scheduler_impl_unittest.cc",
     "task_scheduler/task_tracker_posix_unittest.cc",
     "task_scheduler/task_tracker_unittest.cc",
     "task_scheduler/task_unittest.cc",
     "task_scheduler/test_task_factory.cc",
     "task_scheduler/test_task_factory.h",
     "task_scheduler/test_utils.h",
     "template_util_unittest.cc",
     "test/histogram_tester_unittest.cc",
     "test/scoped_mock_time_message_loop_task_runner_unittest.cc",
@@ skipping 527 matching lines @@
 }
 
 fuzzer_test("base_json_correctness_fuzzer") {
   sources = [
     "json/correctness_fuzzer.cc",
   ]
   deps = [
     ":base",
   ]
 }