Track thread activities in order to diagnose hangs.

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 127 matching lines @@
           'containers/hash_tables.h',
           'containers/linked_list.h',
           'containers/mru_cache.h',
           'containers/scoped_ptr_hash_map.h',
           'containers/small_map.h',
           'containers/stack_container.h',
           'cpu.cc',
           'cpu.h',
           'critical_closure.h',
           'critical_closure_internal_ios.mm',
+          'debug/activity_tracker.cc',
+          'debug/activity_tracker.h',
           'debug/alias.cc',
           'debug/alias.h',
           'debug/asan_invalid_access.cc',
           'debug/asan_invalid_access.h',
           'debug/close_handle_hook_win.cc',
           'debug/close_handle_hook_win.h',
           'debug/crash_logging.cc',
           'debug/crash_logging.h',
           'debug/debugger.cc',
           'debug/debugger.h',
@@ skipping 937 matching lines @@
           'i18n/time_formatting.h',
           'i18n/timezone.cc',
           'i18n/timezone.h',
           'i18n/utf8_validator_tables.cc',
           'i18n/utf8_validator_tables.h',
         ],
       }]
     ],
   },
 }