Update task tracking to not depend on message_loop_ singleton

base/threading/worker_pool_posix.cc

Index: base/threading/worker_pool_posix.cc
===================================================================
--- base/threading/worker_pool_posix.cc	(revision 104925)
+++ base/threading/worker_pool_posix.cc	(working copy)
@@ -87,7 +87,15 @@
     UNSHIPPED_TRACE_EVENT2("task", "WorkerThread::ThreadMain::Run",
         "src_file", pending_task.posted_from.file_name(),
         "src_func", pending_task.posted_from.function_name());
+
+#if defined(TRACK_ALL_TASK_OBJECTS)
+    TimeTicks start_of_run = tracked_objects::ThreadData::Now();
+#endif  // defined(TRACK_ALL_TASK_OBJECTS)
     pending_task.task.Run();
+#if defined(TRACK_ALL_TASK_OBJECTS)
+    tracked_objects::ThreadData::TallyADeathIfActive(pending_task.post_births,
+        pending_task.time_posted, TimeTicks::TimeTicks(), start_of_run);
+#endif  // defined(TRACK_ALL_TASK_OBJECTS)
   }
 
   // The WorkerThread is non-joinable, so it deletes itself.
@@ -113,6 +121,10 @@
     const base::Closure& task)
     : posted_from(posted_from),
       task(task) {
+#if defined(TRACK_ALL_TASK_OBJECTS)
+  post_births = tracked_objects::ThreadData::TallyABirthIfActive(posted_from);
+  time_posted = tracked_objects::ThreadData::Now();
+#endif  // defined(TRACK_ALL_TASK_OBJECTS)
 }
 
 PosixDynamicThreadPool::PendingTask::~PendingTask() {