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

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.
 
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
@@ skipping 724 matching lines @@
       "files/file_enumerator_posix.cc",
       "files/file_proxy.cc",
       "files/file_util.cc",
       "files/file_util_posix.cc",
       "files/file_util_proxy.cc",
       "files/important_file_writer.cc",
       "files/important_file_writer.h",
       "files/scoped_temp_dir.cc",
       "message_loop/message_pump_libevent.cc",
       "native_library_posix.cc",
+      "native_stack_sampler_posix.cc",
       "path_service.cc",
       "rand_util_posix.cc",
       "scoped_native_library.cc",
       "sync_socket_posix.cc",
       "sys_info.cc",
       "sys_info_posix.cc",
     ]
   } else {
     # Remove NaCl stuff.
     sources -= [
@@ skipping 938 matching lines @@
 
   # GYP: //base.gyp:base_java_unittest_support
   android_library("base_java_unittest_support") {
     deps = [
       ":base_java",
     ]
     java_files =
         [ "test/android/java/src/org/chromium/base/ContentUriTestUtils.java" ]
   }
 }