[chromium-discuss] How to get the arguments for a task in message loop

[l***@pku.edu.cn]

Hi all,

I know that `PostTask(FROM_HERE, base::bind(..))` can be utilized to
generate a task into thread's message loop. I find that
`TaskAnnotator:RunTask` executes a pending task. Now I want to get the real
arguments for a pending task in `TaskAnnotator:RunTask`.

```
void TaskAnnotator::RunTask(const char* queue_function,
PendingTask* pending_task) {
...
// before this task runs, I want to get the corresponding function name
and arguments
std::move(pending_task->task).Run();
...
}
```

I try to read `OnceCallback` class, but it is hard for me to understand. Is
there any solution? If I cannot directly get these arguments, please tell
me how to add a new function in `OnceCallback ` class or anything else to
figure it out. Great thanks.