[Downloads] Retry renames after transient failures.

content/browser/download/download_stats.cc

Index: content/browser/download/download_stats.cc
diff --git a/content/browser/download/download_stats.cc b/content/browser/download/download_stats.cc
index 66716cac415d555be3af8e34fe8e437c8f137702..b508970cb319c99f05fa10d6582e8044e23c62ce 100644
--- a/content/browser/download/download_stats.cc
+++ b/content/browser/download/download_stats.cc
@@ -611,6 +611,20 @@ void RecordFileBandwidth(size_t length,
                            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,