Stack sampling profiler to profile on Mac. TEST-- not for commit.

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 797 matching lines @@
                'files/file_path_watcher_kqueue.h',
                'files/file_proxy.cc',
                'files/file_util.cc',
                'files/file_util_posix.cc',
                'files/file_util_proxy.cc',
                'files/important_file_writer.cc',
                'files/scoped_temp_dir.cc',
                'memory/shared_memory_posix.cc',
                'native_library_posix.cc',
                'path_service.cc',
+               'profiler/native_stack_sampler_posix.cc',
                'posix/unix_domain_socket_linux.cc',
                'process/kill.cc',
                'process/kill_posix.cc',
                'process/launch.cc',
                'process/launch_posix.cc',
                'process/process_metrics.cc',
                'process/process_metrics_posix.cc',
                'process/process_posix.cc',
                'rand_util_posix.cc',
                'scoped_native_library.cc',
@@ skipping 220 matching lines @@
           'i18n/time_formatting.h',
           'i18n/timezone.cc',
           'i18n/timezone.h',
           'i18n/utf8_validator_tables.cc',
           'i18n/utf8_validator_tables.h',
         ],
       }]
     ],
   },
 }