Move OneWriterSeqLock and SharedMemorySeqLockBuffer from content/ to device/base/synchronization

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 735 matching lines @@
     "synchronization/atomic_flag.h",
     "synchronization/cancellation_flag.h",
     "synchronization/condition_variable.h",
     "synchronization/condition_variable_posix.cc",
     "synchronization/condition_variable_win.cc",
     "synchronization/lock.cc",
     "synchronization/lock.h",
     "synchronization/lock_impl.h",
     "synchronization/lock_impl_posix.cc",
     "synchronization/lock_impl_win.cc",
+    "synchronization/one_writer_seqlock.cc",
+    "synchronization/one_writer_seqlock.h",
     "synchronization/read_write_lock.h",
     "synchronization/read_write_lock_nacl.cc",
     "synchronization/read_write_lock_posix.cc",
     "synchronization/read_write_lock_win.cc",
+    "synchronization/shared_memory_seqlock_buffer.h",
     "synchronization/spin_wait.h",
     "synchronization/waitable_event.h",
     "synchronization/waitable_event_posix.cc",
     "synchronization/waitable_event_watcher.h",
     "synchronization/waitable_event_watcher_posix.cc",
     "synchronization/waitable_event_watcher_win.cc",
     "synchronization/waitable_event_win.cc",
     "sys_byteorder.h",
     "sys_info.cc",
     "sys_info.h",
@@ skipping 1147 matching lines @@
     "strings/stringprintf_unittest.cc",
     "strings/sys_string_conversions_mac_unittest.mm",
     "strings/sys_string_conversions_unittest.cc",
     "strings/utf_offset_string_conversions_unittest.cc",
     "strings/utf_string_conversions_unittest.cc",
     "supports_user_data_unittest.cc",
     "sync_socket_unittest.cc",
     "synchronization/atomic_flag_unittest.cc",
     "synchronization/condition_variable_unittest.cc",
     "synchronization/lock_unittest.cc",
+    "synchronization/one_writer_seqlock_unittest.cc",
     "synchronization/read_write_lock_unittest.cc",
     "synchronization/waitable_event_unittest.cc",
     "synchronization/waitable_event_watcher_unittest.cc",
     "sys_byteorder_unittest.cc",
     "sys_info_unittest.cc",
     "system_monitor/system_monitor_unittest.cc",
     "task/cancelable_task_tracker_unittest.cc",
     "task_runner_util_unittest.cc",
     "task_scheduler/delayed_task_manager_unittest.cc",
     "task_scheduler/priority_queue_unittest.cc",
@@ skipping 522 matching lines @@
     testonly = true
     deps = [
       ":base_java",
     ]
     java_files = [
       "test/android/java/src/org/chromium/base/ContentUriTestUtils.java",
       "test/android/java/src/org/chromium/base/TestSystemMessageHandler.java",
     ]
   }
 }