Fix top-level trace event name in MessageLoop::RunTask

base/message_loop/message_loop.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/message_loop.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
@@ skipping 456 matching lines @@
     pending_high_res_tasks_--;
     CHECK_GE(pending_high_res_tasks_, 0);
   }
 #endif
 
   // Execute the task and assume the worst: It is probably not reentrant.
   nestable_tasks_allowed_ = false;
 
   HistogramEvent(kTaskRunEvent);
 
-  TRACE_TASK_EXECUTION("toplevel", pending_task);
+  TRACE_TASK_EXECUTION("MessageLoop::RunTask", pending_task);
 
   FOR_EACH_OBSERVER(TaskObserver, task_observers_,
                     WillProcessTask(pending_task));
   task_annotator_.RunTask("MessageLoop::PostTask", pending_task);
   FOR_EACH_OBSERVER(TaskObserver, task_observers_,
                     DidProcessTask(pending_task));
 
   nestable_tasks_allowed_ = true;
 }
 
@@ skipping 259 matching lines @@
       persistent,
       mode,
       controller,
       delegate);
 }
 #endif
 
 #endif  // !defined(OS_NACL_SFI)
 
 }  // namespace base