Introduce TaskRunnerHandle.

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 681 matching lines @@
           'threading/platform_thread_posix.cc',
           'threading/platform_thread_win.cc',
           'threading/post_task_and_reply_impl.cc',
           'threading/post_task_and_reply_impl.h',
           'threading/sequenced_task_runner_handle.cc',
           'threading/sequenced_task_runner_handle.h',
           'threading/sequenced_worker_pool.cc',
           'threading/sequenced_worker_pool.h',
           'threading/simple_thread.cc',
           'threading/simple_thread.h',
+          'threading/task_runner_handle.cc',
+          'threading/task_runner_handle.h',
+          'threading/task_runner_handle_internal.h',
           'threading/thread.cc',
           'threading/thread.h',
           'threading/thread_checker.h',
           'threading/thread_checker_impl.cc',
           'threading/thread_checker_impl.h',
           'threading/thread_collision_warner.cc',
           'threading/thread_collision_warner.h',
           'threading/thread_id_name_manager.cc',
           'threading/thread_id_name_manager.h',
           'threading/thread_local.h',
@@ skipping 387 matching lines @@
           'i18n/time_formatting.h',
           'i18n/timezone.cc',
           'i18n/timezone.h',
           'i18n/utf8_validator_tables.cc',
           'i18n/utf8_validator_tables.h',
         ],
       }]
     ],
   },
 }