Fix GN bootstrap.

Add two files needed to compile GN.

R=brettw@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2059803002
Cr-Original-Commit-Position: refs/heads/master@{#399288}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 6810e5b4eb8470827156f0ee2041030c09fa9b04
diff --git a/tools/gn/bootstrap/bootstrap.py b/tools/gn/bootstrap/bootstrap.py
index 4648b54..72ffd60 100755
--- a/tools/gn/bootstrap/bootstrap.py
+++ b/tools/gn/bootstrap/bootstrap.py
@@ -316,6 +316,7 @@
       'base/trace_event/memory_dump_manager.cc',
       'base/trace_event/memory_dump_request_args.cc',
       'base/trace_event/memory_dump_session_state.cc',
+      'base/trace_event/memory_infra_background_whitelist.cc',
       'base/trace_event/process_memory_dump.cc',
       'base/trace_event/process_memory_maps.cc',
       'base/trace_event/process_memory_totals.cc',
@@ -353,6 +354,7 @@
         'base/process/process_posix.cc',
         'base/synchronization/condition_variable_posix.cc',
         'base/synchronization/lock_impl_posix.cc',
+        'base/synchronization/read_write_lock_posix.cc',
         'base/synchronization/waitable_event_posix.cc',
         'base/sys_info_posix.cc',
         'base/threading/platform_thread_internal_posix.cc',