Reference CL for the new task scheduler.

base/BUILD.gn

Index: base/BUILD.gn
diff --git a/base/BUILD.gn b/base/BUILD.gn
index 3bafc89ff1939bffd03a1e487233f4fd31d63a55..719c5ba23e36b5bd4ea008e221d6927ced297d27 100644
--- a/base/BUILD.gn
+++ b/base/BUILD.gn
@@ -739,6 +739,34 @@ component("base") {
     "task_runner.cc",
     "task_runner.h",
     "task_runner_util.h",
+    "task_scheduler/delayed_task_manager.cc",
+    "task_scheduler/delayed_task_manager.h",
+    "task_scheduler/post_task.cc",
+    "task_scheduler/post_task.h",
+    "task_scheduler/priority_queue.cc",
+    "task_scheduler/priority_queue.h",
+    "task_scheduler/scheduler_lock.cc",
+    "task_scheduler/scheduler_lock.h",
+    "task_scheduler/sequence.cc",
+    "task_scheduler/sequence.h",
+    "task_scheduler/sequence_sort_key.cc",
+    "task_scheduler/sequence_sort_key.h",
+    "task_scheduler/shutdown_manager.cc",
+    "task_scheduler/shutdown_manager.h",
+    "task_scheduler/task.cc",
+    "task_scheduler/task.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_traits.cc",
+    "task_scheduler/task_traits.h",
+    "task_scheduler/thread_pool.cc",
+    "task_scheduler/thread_pool.h",
+    "task_scheduler/utils.cc",
+    "task_scheduler/utils.h",
+    "task_scheduler/worker_thread.cc",
+    "task_scheduler/worker_thread.h",
     "template_util.h",
     "third_party/dmg_fp/dmg_fp.h",
     "third_party/dmg_fp/dtoa_wrapper.cc",
@@ -1686,6 +1714,18 @@ test("base_unittests") {
     "system_monitor/system_monitor_unittest.cc",
     "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/sequence_sort_key_unittest.cc",
+    "task_scheduler/sequence_unittest.cc",
+    "task_scheduler/shutdown_manager_unittest.cc",
+    "task_scheduler/task_scheduler_impl_unittest.cc",
+    "task_scheduler/test_util.cc",
+    "task_scheduler/test_util.h",
+    "task_scheduler/thread_pool_unittest.cc",
+    "task_scheduler/utils_unittest.cc",
+    "task_scheduler/worker_thread_unittest.cc",
     "template_util_unittest.cc",
     "test/histogram_tester_unittest.cc",
     "test/icu_test_util.cc",