Implement SequenceChecker, which is a generalization of ThreadChecker

base/base.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'includes': [
     '../build/win_precompile.gypi',
@@ skipping 493 matching lines @@
         'posix/file_descriptor_shuffle_unittest.cc',
         'pr_time_unittest.cc',
         'process_util_unittest.cc',
         'process_util_unittest_ios.cc',
         'process_util_unittest_mac.h',
         'process_util_unittest_mac.mm',
         'profiler/tracked_time_unittest.cc',
         'rand_util_unittest.cc',
         'scoped_native_library_unittest.cc',
         'scoped_observer.h',
+        'sequence_checker_unittest.cc',
+        'sequence_checker_impl_unittest.cc',
         'sha1_unittest.cc',
         'shared_memory_unittest.cc',
         'stl_util_unittest.cc',
         'string16_unittest.cc',
         'string_number_conversions_unittest.cc',
         'string_piece_unittest.cc',
         'string_split_unittest.cc',
         'string_tokenizer_unittest.cc',
         'string_util_unittest.cc',
         'stringize_macros_unittest.cc',
@@ skipping 251 matching lines @@
         'test/main_hook_ios.mm',
         'test/mock_chrome_application_mac.h',
         'test/mock_chrome_application_mac.mm',
         'test/mock_devices_changed_observer.cc',
         'test/mock_devices_changed_observer.h',
         'test/mock_time_provider.cc',
         'test/mock_time_provider.h',
         'test/multiprocess_test.cc',
         'test/multiprocess_test.h',
         'test/multiprocess_test_android.cc',
+        'test/null_task_runner.cc',
+        'test/null_task_runner.h',
         'test/perf_test_suite.cc',
         'test/perf_test_suite.h',
         'test/scoped_locale.cc',
         'test/scoped_locale.h',
         'test/scoped_path_override.cc',
         'test/scoped_path_override.h',
         'test/sequenced_task_runner_test_template.cc',
         'test/sequenced_task_runner_test_template.h',
         'test/task_runner_test_template.cc',
         'test/task_runner_test_template.h',
@@ skipping 308 matching lines @@
             'base_unittests.isolate',
           ],
           'sources': [
             'base_unittests.isolate',
           ],
         },
       ],
     }],
   ],
 }