Identify the hung thread using the Wait Chain Traversal API

base/BUILD.gn

 # Copyright (c) 2013 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.
 
 # HOW TO WRITE CONDITIONALS IN THIS FILE
 # ======================================
 #
 # In many other places, one would write a conditional that expresses all the
 # cases when a source file is used or unused, and then either add or subtract
 # it from the sources list in that case
@@ skipping 956 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",
   ]
 
   defines = []
   data = []
@@ skipping 897 matching lines @@
     "win/object_watcher_unittest.cc",
     "win/pe_image_unittest.cc",
     "win/registry_unittest.cc",
     "win/scoped_bstr_unittest.cc",
     "win/scoped_comptr_unittest.cc",
     "win/scoped_handle_unittest.cc",
     "win/scoped_process_information_unittest.cc",
     "win/scoped_variant_unittest.cc",
     "win/shortcut_unittest.cc",
     "win/startup_information_unittest.cc",
+    "win/wait_chain_unittest.cc",
     "win/win_util_unittest.cc",
     "win/windows_version_unittest.cc",
     "win/wrapped_window_proc_unittest.cc",
   ]
 
   deps = [
     ":base",
     ":i18n",
     ":message_loop_tests",
     "//base/test:run_all_unittests",
@@ skipping 313 matching lines @@
 
   # GYP: //base.gyp:base_java_unittest_support
   android_library("base_java_unittest_support") {
     deps = [
       ":base_java",
     ]
     java_files =
         [ "test/android/java/src/org/chromium/base/ContentUriTestUtils.java" ]
   }
 }