Create WorkerThread, an abstraction to perform some work on an interval.

util/util.gyp

 # Copyright 2014 The Crashpad Authors. All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #     http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 134 matching lines @@
         'synchronization/semaphore_mac.cc',
         'synchronization/semaphore_posix.cc',
         'synchronization/semaphore_win.cc',
         'synchronization/semaphore.h',
         'thread/thread.cc',
         'thread/thread.h',
         'thread/thread_log_messages.cc',
         'thread/thread_log_messages.h',
         'thread/thread_posix.cc',
         'thread/thread_win.cc',
+        'thread/worker_thread.cc',
+        'thread/worker_thread.h',
         'win/address_types.h',
         'win/capture_context.asm',
         'win/capture_context.h',
         'win/checked_win_address_range.h',
         'win/command_line.cc',
         'win/command_line.h',
         'win/critical_section_with_debug_info.cc',
         'win/critical_section_with_debug_info.h',
         'win/exception_handler_server.cc',
         'win/exception_handler_server.h',
@@ skipping 103 matching lines @@
                   'UseSafeExceptionHandlers': 'true',
                 },
               },
             }],
           ],
         }],
       ],
     },
   ],
 }