base: Factor task debug annotations out of MessageLoop

base/message_loop/incoming_task_queue.cc

 // Copyright 2013 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.
 
 #include "base/message_loop/incoming_task_queue.h"
 
-#include "base/debug/trace_event.h"
 #include "base/location.h"
 #include "base/message_loop/message_loop.h"
 #include "base/synchronization/waitable_event.h"
 
 namespace base {
 namespace internal {
 
 IncomingTaskQueue::IncomingTaskQueue(MessageLoop* message_loop)
     : message_loop_(message_loop),
       next_sequence_num_(0) {
@@ skipping 105 matching lines @@
   if (!message_loop_) {
     pending_task->task.Reset();
     return false;
   }
 
   // Initialize the sequence number. The sequence number is used for delayed
   // tasks (to faciliate FIFO sorting when two tasks have the same
   // delayed_run_time value) and for identifying the task in about:tracing.
   pending_task->sequence_num = next_sequence_num_++;
 
-  TRACE_EVENT_FLOW_BEGIN0(TRACE_DISABLED_BY_DEFAULT("toplevel.flow"),
-      "MessageLoop::PostTask",
-      TRACE_ID_MANGLE(message_loop_->GetTaskTraceID(*pending_task)));
+  message_loop_->task_annotator()->DidQueueTask("MessageLoop::PostTask",
+                                                *pending_task);
 
   bool was_empty = incoming_queue_.empty();
   incoming_queue_.push(*pending_task);
   pending_task->task.Reset();
 
   // Wake up the pump.
   message_loop_->ScheduleWork(was_empty);
 
   return true;
 }
 
 }  // namespace internal
 }  // namespace base