Replace Closure in TaskRunner::PostTask with OneShotCallback

base/debug/task_annotator.cc

Index: base/debug/task_annotator.cc
diff --git a/base/debug/task_annotator.cc b/base/debug/task_annotator.cc
index 2747d63c2bf29aa3d356c8c750ff3784b943e66f..8568e48ebf679878fd687c0604284120ea32eabf 100644
--- a/base/debug/task_annotator.cc
+++ b/base/debug/task_annotator.cc
@@ -28,17 +28,17 @@ void TaskAnnotator::DidQueueTask(const char* queue_function,
 }
 
 void TaskAnnotator::RunTask(const char* queue_function,
-                            const PendingTask& pending_task) {
-  ScopedTaskRunActivity task_activity(pending_task);
+                            PendingTask* pending_task) {
+  ScopedTaskRunActivity task_activity(*pending_task);
 
   tracked_objects::TaskStopwatch stopwatch;
   stopwatch.Start();
   tracked_objects::Duration queue_duration =
-      stopwatch.StartTime() - pending_task.EffectiveTimePosted();
+      stopwatch.StartTime() - pending_task->EffectiveTimePosted();
 
   TRACE_EVENT_WITH_FLOW1(TRACE_DISABLED_BY_DEFAULT("toplevel.flow"),
                           queue_function,
-                          TRACE_ID_MANGLE(GetTaskTraceID(pending_task)),
+                          TRACE_ID_MANGLE(GetTaskTraceID(*pending_task)),
                           TRACE_EVENT_FLAG_FLOW_IN,
                           "queue_duration",
                           queue_duration.InMilliseconds());
@@ -48,14 +48,14 @@ void TaskAnnotator::RunTask(const char* queue_function,
   // crashes. Be careful not to assume that the variable itself will have the
   // expected value when displayed by the optimizer in an optimized build.
   // Look at a memory dump of the stack.
-  const void* program_counter = pending_task.posted_from.program_counter();
+  const void* program_counter = pending_task->posted_from.program_counter();
   debug::Alias(&program_counter);
 
-  pending_task.task.Run();
+  std::move(pending_task->task).Run();
 
   stopwatch.Stop();
   tracked_objects::ThreadData::TallyRunOnNamedThreadIfTracking(
-      pending_task, stopwatch);
+      *pending_task, stopwatch);
 }
 
 uint64_t TaskAnnotator::GetTaskTraceID(const PendingTask& task) const {