Improve download performance statistics.

content/browser/download/download_stats.h

Index: content/browser/download/download_stats.h
diff --git a/content/browser/download/download_stats.h b/content/browser/download/download_stats.h
index 7633e510d4ee111f47af8a45edb8169a46d808ff..91a68228467b1bf63c552cefad13d014ad3d8976 100644
--- a/content/browser/download/download_stats.h
+++ b/content/browser/download/download_stats.h
@@ -141,10 +141,11 @@ 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,