1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef CONTENT_PUBLIC_BROWSER_HISTOGRAM_FETCHER_H_
6#define CONTENT_PUBLIC_BROWSER_HISTOGRAM_FETCHER_H_
7
8#include "base/basictypes.h"
9#include "base/callback.h"
10#include "base/time/time.h"
11#include "content/common/content_export.h"
12
13namespace base {
14class MessageLoop;
15}
16
17namespace content {
18
19// Fetch histogram data asynchronously from the various child processes, into
20// the browser process. This method is used by the metrics services in
21// preparation for a log upload. It contacts all processes, and get them to
22// upload to the browser any/all changes to histograms.  When all changes have
23// been acquired, or when the wait time expires (whichever is sooner), post the
24// callback to the specified message loop. Note the callback is posted exactly
25// once.
26CONTENT_EXPORT void FetchHistogramsAsynchronously(
27    base::MessageLoop* callback_thread,
28    const base::Closure& callback,
29    base::TimeDelta wait_time);
30
31}  // namespace content
32
33#endif  // CONTENT_PUBLIC_BROWSER_HISTOGRAM_FETCHER_H_
34