downloads: Improve download rate estimation.

content/browser/download/download_file_impl.h

 // Copyright (c) 2012 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.
 
 #ifndef CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_FILE_IMPL_H_
 #define CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_FILE_IMPL_H_
 
 #include "content/browser/download/download_file.h"
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time.h"
 #include "base/timer.h"
 #include "content/browser/byte_stream.h"
 #include "content/browser/download/base_file.h"
+#include "content/browser/download/rate_estimator.h"
 #include "content/public/browser/download_save_info.h"
 #include "net/base/net_log.h"
 
 namespace content {
 class ByteStreamReader;
 class DownloadDestinationObserver;
 class DownloadManager;
 class PowerSaveBlocker;
 struct DownloadCreateInfo;
 
@@ skipping 62 matching lines @@
   // with DownloadFile and get rid of BaseFile.
   scoped_ptr<ByteStreamReader> stream_reader_;
 
   // Used to trigger progress updates.
   scoped_ptr<base::RepeatingTimer<DownloadFileImpl> > update_timer_;
 
   // Statistics
   size_t bytes_seen_;
   base::TimeDelta disk_writes_time_;
   base::TimeTicks download_start_;
+  RateEstimator rate_estimator_;
 
   net::BoundNetLog bound_net_log_;
 
   base::WeakPtr<DownloadDestinationObserver> observer_;
 
   base::WeakPtrFactory<DownloadFileImpl> weak_factory_;
 
   // RAII handle to keep the system from sleeping while we're downloading.
   scoped_ptr<PowerSaveBlocker> power_save_blocker_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadFileImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_FILE_IMPL_H_