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