Add unit-test for SharedSampler handling of zero-thread processes.

chrome/browser/BUILD.gn

 # Copyright 2014 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/chrome_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//chrome/common/features.gni")
@@ skipping 3395 matching lines @@
       "task_manager/providers/web_contents/tab_contents_task.h",
       "task_manager/providers/web_contents/web_contents_tag.cc",
       "task_manager/providers/web_contents/web_contents_tag.h",
       "task_manager/providers/web_contents/web_contents_tags_manager.cc",
       "task_manager/providers/web_contents/web_contents_tags_manager.h",
       "task_manager/providers/web_contents/web_contents_task_provider.cc",
       "task_manager/providers/web_contents/web_contents_task_provider.h",
       "task_manager/sampling/shared_sampler.h",
       "task_manager/sampling/shared_sampler_posix.cc",
       "task_manager/sampling/shared_sampler_win.cc",
+      "task_manager/sampling/shared_sampler_win_defines.h",
       "task_manager/sampling/task_group.cc",
       "task_manager/sampling/task_group.h",
       "task_manager/sampling/task_group_sampler.cc",
       "task_manager/sampling/task_group_sampler.h",
       "task_manager/sampling/task_manager_impl.cc",
       "task_manager/sampling/task_manager_impl.h",
       "task_manager/sampling/task_manager_io_thread_helper.cc",
       "task_manager/sampling/task_manager_io_thread_helper.h",
       "task_manager/task_manager_interface.cc",
       "task_manager/task_manager_interface.h",
@@ skipping 1076 matching lines @@
       "media/pepper_cdm_test_constants.cc",
       "media/pepper_cdm_test_constants.h",
     ]
   }
 }
 
 service_manifest("preferences_manifest") {
   name = "preferences"
   source = "prefs/preferences_manifest.json"
 }