[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..d88eef2c4e2c039e61add7820cc94b88b562cfbe 100644
--- a/content/browser/download/download_stats.cc
+++ b/content/browser/download/download_stats.cc
@@ -611,6 +611,18 @@ void RecordFileBandwidth(size_t length,
                            disk_write_time_ms * 100 / elapsed_time_ms);
 }
 
+void RecordDownloadFileRenameResultAfterRetry(
+    base::TimeDelta time_since_first_failure,
+    DownloadInterruptReason interrupt_reason) {
+  if (interrupt_reason == DOWNLOAD_INTERRUPT_REASON_NONE) {
+    UMA_HISTOGRAM_TIMES("Download.TimeToRenameSuccessAfterInitialFailure",
+                        time_since_first_failure);
+  } else {
+    UMA_HISTOGRAM_TIMES("Download.TimeToRenameFailureAfterInitialFailure",
+                        time_since_first_failure);
+  }
+}
+
 void RecordSavePackageEvent(SavePackageEvent event) {
   UMA_HISTOGRAM_ENUMERATION("Download.SavePackage",
                             event,