Fix GN bootstrap

BUG=none
R=brettw@chromium.org

Review URL: https://codereview.chromium.org/2272653003 .

Cr-Commit-Position: refs/heads/master@{#414376}

tools/gn/bootstrap/bootstrap.py

@@ -445,6 +445,21 @@ def write_gn_ninja(path, root_gen_dir, options):
       'base/synchronization/lock.cc',
       'base/sys_info.cc',
       'base/task_runner.cc',
+      'base/task_scheduler/delayed_task_manager.cc',
+      'base/task_scheduler/post_task.cc',
+      'base/task_scheduler/priority_queue.cc',
+      'base/task_scheduler/scheduler_lock_impl.cc',
+      'base/task_scheduler/scheduler_service_thread.cc',
+      'base/task_scheduler/scheduler_worker.cc',
+      'base/task_scheduler/scheduler_worker_pool_impl.cc',
+      'base/task_scheduler/scheduler_worker_stack.cc',
+      'base/task_scheduler/sequence.cc',
+      'base/task_scheduler/sequence_sort_key.cc',
+      'base/task_scheduler/task.cc',
+      'base/task_scheduler/task_scheduler.cc',
+      'base/task_scheduler/task_scheduler_impl.cc',
+      'base/task_scheduler/task_tracker.cc',
+      'base/task_scheduler/task_traits.cc',
       'base/third_party/dmg_fp/dtoa_wrapper.cc',
       'base/third_party/dmg_fp/g_fmt.cc',
       'base/third_party/icu/icu_utf.cc',