[Downloads] Retry renames after transient failures.

content/browser/download/download_stats.cc

 // 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.
 
 #include "content/browser/download/download_stats.h"
 
 #include "base/metrics/histogram.h"
 #include "base/metrics/sparse_histogram.h"
 #include "base/strings/string_util.h"
 #include "content/browser/download/download_resource_handler.h"
@@ skipping 593 matching lines @@
   UMA_HISTOGRAM_CUSTOM_COUNTS(
       "Download.BandwidthOverallBytesPerSecond",
       (1000 * length / elapsed_time_ms), 1, 50000000, 50);
   UMA_HISTOGRAM_CUSTOM_COUNTS(
       "Download.BandwidthDiskBytesPerSecond",
       (1000 * length / disk_write_time_ms), 1, 50000000, 50);
   UMA_HISTOGRAM_COUNTS_100("Download.DiskBandwidthUsedPercentage",
                            disk_write_time_ms * 100 / elapsed_time_ms);
 }
 
+void RecordDownloadFileRenameResult(base::TimeTicks time_of_first_failure,
+                                    DownloadInterruptReason interrupt_reason) {
+  if (time_of_first_failure.is_null())
+    return;
+  base::TimeDelta interval = time_of_first_failure - base::TimeTicks::Now();
+  if (interrupt_reason == DOWNLOAD_INTERRUPT_REASON_NONE) {
+    UMA_HISTOGRAM_TIMES("Download.TimeToRenameSuccessAfterInitialFailure",
+                        interval);
+  } else {
+    UMA_HISTOGRAM_TIMES("Download.TimeToRenameFailureAfterInitialFailure",
+                        interval);
+  }
+}
+
 void RecordSavePackageEvent(SavePackageEvent event) {
   UMA_HISTOGRAM_ENUMERATION("Download.SavePackage",
                             event,
                             SAVE_PACKAGE_LAST_ENTRY);
 }
 
 void RecordOriginStateOnResumption(bool is_partial,
                                    int state) {
   if (is_partial)
     UMA_HISTOGRAM_ENUMERATION("Download.OriginStateOnPartialResumption", state,
                               ORIGIN_STATE_ON_RESUMPTION_MAX);
   else
     UMA_HISTOGRAM_ENUMERATION("Download.OriginStateOnFullResumption", state,
                               ORIGIN_STATE_ON_RESUMPTION_MAX);
 }
 
 }  // namespace content