[GN] Fix tools/gn/bootstrap/bootstrap.py.

Update the list of files required to boostrap gn (best-effort).
Tested that gn is build successfully on macOS.

BUG=None

Review-Url: https://codereview.chromium.org/2538903003
Cr-Original-Commit-Position: refs/heads/master@{#435273}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: eace899f8a53284c3618940122caa858c03c602c

tools/gn/bootstrap/bootstrap.py

diff --git a/tools/gn/bootstrap/bootstrap.py b/tools/gn/bootstrap/bootstrap.py
index 90adca2..821a187 100755
--- a/tools/gn/bootstrap/bootstrap.py
+++ b/tools/gn/bootstrap/bootstrap.py
@@ -375,6 +375,7 @@
       'base/command_line.cc',
       'base/debug/activity_tracker.cc',
       'base/debug/alias.cc',
+      'base/debug/dump_without_crashing.cc',
       'base/debug/stack_trace.cc',
       'base/debug/task_annotator.cc',
       'base/environment.cc',
@@ -423,6 +424,7 @@
       'base/pending_task.cc',
       'base/pickle.cc',
       'base/process/kill.cc',
+      'base/process/process_handle.cc',
       'base/process/process_iterator.cc',
       'base/process/process_metrics.cc',
       'base/profiler/scoped_profile.cc',
@@ -452,6 +454,7 @@
       'base/task_scheduler/scheduler_lock_impl.cc',
       'base/task_scheduler/scheduler_worker.cc',
       'base/task_scheduler/scheduler_worker_pool_impl.cc',
+      'base/task_scheduler/scheduler_worker_pool_params.cc',
       'base/task_scheduler/scheduler_worker_stack.cc',
       'base/task_scheduler/sequence.cc',
       'base/task_scheduler/sequence_sort_key.cc',