Improve download performance statistics.

content/browser/download/download_stats.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.
 //
 // Holds helpers for gathering UMA stats about downloads.
 
 #ifndef CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_STATS_H_
 #define CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_STATS_H_
 #pragma once
 
@@ skipping 123 matching lines @@
 
 // Record the number of downloads removed by ClearAll.
 void RecordClearAllSize(int size);
 
 // Record the number of completed unopened downloads when a download is opened.
 void RecordOpensOutstanding(int size);
 
 // Record how long we block the file thread at a time.
 void RecordContiguousWriteTime(base::TimeDelta time_blocked);
 
-// Record overall bandwidth stats at the network end.
-void RecordNetworkBandwidth(size_t length,
-                            base::TimeDelta elapsed_time,
-                            base::TimeDelta paused_time);
+// Record the percentage of time we had to block the network (i.e.
+// how often, for each download, something other than the network
+// was the bottleneck).
+void RecordNetworkBlockage(base::TimeDelta resource_handler_lifetime,
+                           base::TimeDelta resource_handler_blocked_time);
 
 // Record overall bandwidth stats at the file end.
 void RecordFileBandwidth(size_t length,
                          base::TimeDelta disk_write_time,
                          base::TimeDelta elapsed_time);
 
 enum SavePackageEvent {
   // The user has started to save a page as a package.
   SAVE_PACKAGE_STARTED,
 
@@ skipping 10 matching lines @@
   SAVE_PACKAGE_WRITE_TO_FAILED,
 
   SAVE_PACKAGE_LAST_ENTRY
 };
 
 void RecordSavePackageEvent(SavePackageEvent event);
 
 }  // namespace download_stats
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_STATS_H_