fuchsia: Implement platform thread functions

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 1227 matching lines @@
       "message_loop/message_pump_libevent.h",
       "process/kill_posix.cc",
       "process/launch_posix.cc",
       "process/process_handle_posix.cc",
       "process/process_posix.cc",
     ]
 
     sources += [
       "process/process_fuchsia.cc",
       "sys_info_fuchsia.cc",
+      "threading/platform_thread_fuchsia.cc",
     ]
   }
 
   # NaCl.
   if (is_nacl) {
     # We reset sources_assignment_filter in order to explicitly include
     # the linux file (which would otherwise be filtered out).
     set_sources_assignment_filter([])
     sources += [
       "files/file_path_watcher_stub.cc",
@@ skipping 1508 matching lines @@
 }
 
 fuzzer_test("base_json_correctness_fuzzer") {
   sources = [
     "json/correctness_fuzzer.cc",
   ]
   deps = [
     ":base",
   ]
 }