Revert of Remove old/unused atomicops code

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 73 matching lines @@
           'android/sys_utils.cc',
           'android/sys_utils.h',
           'android/thread_utils.h',
           'android/trace_event_binding.cc',
           'android/trace_event_binding.h',
           'at_exit.cc',
           'at_exit.h',
           'atomic_ref_count.h',
           'atomic_sequence_num.h',
           'atomicops.h',
+          'atomicops_internals_gcc.h',
           'atomicops_internals_mac.h',
           'atomicops_internals_portable.h',
+          'atomicops_internals_x86_gcc.cc',
+          'atomicops_internals_x86_gcc.h',
           'atomicops_internals_x86_msvc.h',
           'barrier_closure.cc',
           'barrier_closure.h',
           'base64.cc',
           'base64.h',
           'base_export.h',
           'base_paths.cc',
           'base_paths.h',
           'base_paths_android.cc',
           'base_paths_android.h',
@@ skipping 657 matching lines @@
         'target_conditions': [
           ['OS == "mac" or OS == "ios"', {
             'sources!': [
               'memory/shared_memory_posix.cc',
             ],
           }],
           ['(<(desktop_linux) == 0 and <(chromeos) == 0) or >(nacl_untrusted_build)==1', {
               'sources/': [
                 ['exclude', '^nix/'],
               ],
+              'sources!': [
+                'atomicops_internals_x86_gcc.cc',
+              ],
           }],
           ['<(use_glib)==0 or >(nacl_untrusted_build)==1', {
               'sources!': [
                 'message_loop/message_pump_glib.cc',
               ],
           }],
           ['(OS != "linux" and <(os_bsd) != 1 and OS != "android") or >(nacl_untrusted_build)==1', {
               'sources!': [
                 # Not automatically excluded by the *linux.cc rules.
                 'linux_util.cc',
@@ skipping 64 matching lines @@
               ['include', '^sys_info_linux\\.cc$'],
               ['include', '^worker_pool_linux\\.cc$'],
             ],
           }],
           ['OS == "android" and _toolset == "host" and host_os == "linux"', {
             'defines': [
               'OS_ANDROID_HOST=Linux',
             ],
             'sources/': [
               # Pull in specific files for host builds.
+              ['include', '^atomicops_internals_x86_gcc\\.cc$'],
               ['include', '^threading/platform_thread_linux\\.cc$'],
             ],
           }],
           ['<(chromeos) == 1', {
             'sources!': [
               'power_monitor/power_monitor_device_source_posix.cc',
             ],
           }],
           ['OS == "ios" and _toolset != "host"', {
             'sources/': [
@@ skipping 162 matching lines @@
           'i18n/time_formatting.h',
           'i18n/timezone.cc',
           'i18n/timezone.h',
           'i18n/utf8_validator_tables.cc',
           'i18n/utf8_validator_tables.h',
         ],
       }]
     ],
   },
 }