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 13 namespace base { 14 class MessageLoop; 15 } 16 17 namespace 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. 26 CONTENT_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