Creating a framework for suppressing pollution of the profiler data

base/threading/worker_pool_win.cc

Index: base/threading/worker_pool_win.cc
diff --git a/base/threading/worker_pool_win.cc b/base/threading/worker_pool_win.cc
index fa11dc5a7636d49d7d98f8c982493b253dfad28c..8fc732420dd88428f5ca51f46fb920e7c98bfff8 100644
--- a/base/threading/worker_pool_win.cc
+++ b/base/threading/worker_pool_win.cc
@@ -25,17 +25,20 @@ DWORD CALLBACK WorkItemCallback(void* param) {
                "src_file", pending_task->posted_from.file_name(),
                "src_func", pending_task->posted_from.function_name());
 
-  tracked_objects::TrackedTime start_time =
-      tracked_objects::ThreadData::NowForStartOfRun(pending_task->birth_tally);
+  tracked_objects::ThreadData::PrepareForStartOfRun(pending_task->birth_tally);
 
   g_worker_pool_running_on_this_thread.Get().Set(true);
+
+  tracked_objects::TaskStopwatch stopwatch;
   pending_task->task.Run();
+  stopwatch.Stop();
+
   g_worker_pool_running_on_this_thread.Get().Set(false);
 
   tracked_objects::ThreadData::TallyRunOnWorkerThreadIfTracking(
       pending_task->birth_tally,
-      tracked_objects::TrackedTime(pending_task->time_posted), start_time,
-      tracked_objects::ThreadData::NowForEndOfRun());
+      tracked_objects::TrackedTime(pending_task->time_posted),
+      stopwatch);
 
   delete pending_task;
   return 0;