Identify the hung thread using the Wait Chain Traversal API

base/base.gypi

 # Copyright (c) 2012 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.
 
 {
   'includes': [
     'trace_event/trace_event.gypi',
   ],
   'target_defaults': {
     'variables': {
@@ skipping 771 matching lines @@
           'win/scoped_process_information.cc',
           'win/scoped_process_information.h',
           'win/scoped_propvariant.h',
           'win/scoped_select_object.h',
           'win/scoped_variant.cc',
           'win/scoped_variant.h',
           'win/shortcut.cc',
           'win/shortcut.h',
           'win/startup_information.cc',
           'win/startup_information.h',
+          'win/wait_chain.cc',
+          'win/wait_chain.h',
           'win/win_util.cc',
           'win/win_util.h',
           'win/windows_version.cc',
           'win/windows_version.h',
           'win/wrapped_window_proc.cc',
           'win/wrapped_window_proc.h',
           '<@(trace_event_sources)',
         ],
         'defines': [
           'BASE_IMPLEMENTATION',
@@ skipping 280 matching lines @@
           'i18n/time_formatting.h',
           'i18n/timezone.cc',
           'i18n/timezone.h',
           'i18n/utf8_validator_tables.cc',
           'i18n/utf8_validator_tables.h',
         ],
       }]
     ],
   },
 }