Reland of [tracing] Adding task information to heap profiler

base/threading/worker_pool_posix.cc

Index: base/threading/worker_pool_posix.cc
diff --git a/base/threading/worker_pool_posix.cc b/base/threading/worker_pool_posix.cc
index 53ae4e69627807b209618834104fecf70ed65fc9..dcebe0ab7d2fb704d118a6f797a272ef6c1c0aeb 100644
--- a/base/threading/worker_pool_posix.cc
+++ b/base/threading/worker_pool_posix.cc
@@ -86,9 +86,7 @@ void WorkerThread::ThreadMain() {
     PendingTask pending_task = pool_->WaitForTask();
     if (pending_task.task.is_null())
       break;
-    TRACE_EVENT2("toplevel", "WorkerThread::ThreadMain::Run",
-        "src_file", pending_task.posted_from.file_name(),
-        "src_func", pending_task.posted_from.function_name());
+    TRACE_TASK_EXECUTION("WorkerThread::ThreadMain::Run", pending_task);
 
     tracked_objects::TaskStopwatch stopwatch;
     stopwatch.Start();