Added UMA for downloads that are interrupted at the end.

content/browser/download/download_stats.cc

 // Copyright (c) 2011 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/string_util.h"
 
 namespace download_stats {
@@ skipping 43 matching lines @@
                               received_kb,
                               1,
                               kMaxKb,
                               kBuckets);
   if (!unknown_size) {
     UMA_HISTOGRAM_CUSTOM_COUNTS("Download.InterruptedTotalSizeK",
                                 total_kb,
                                 1,
                                 kMaxKb,
                                 kBuckets);
-    if (delta_bytes >= 0) {
+    if (delta_bytes == 0) {
+      RecordDownloadCount(INTERRUPTED_AT_END_COUNT);
+      UMA_HISTOGRAM_CUSTOM_ENUMERATION(
+          "Download.InterruptedAtEndError",
+          -error,
+          base::CustomHistogram::ArrayToCustomRanges(
+              kAllNetErrorCodes, arraysize(kAllNetErrorCodes)));
+    } else if (delta_bytes > 0) {
       UMA_HISTOGRAM_CUSTOM_COUNTS("Download.InterruptedOverrunBytes",
                                   delta_bytes,
                                   1,
                                   kMaxKb,
                                   kBuckets);
     } else {
       UMA_HISTOGRAM_CUSTOM_COUNTS("Download.InterruptedUnderrunBytes",
                                   -delta_bytes,
                                   1,
                                   kMaxKb,
@@ skipping 85 matching lines @@
     }
   }
 
   // Record the value.
   UMA_HISTOGRAM_ENUMERATION("Download.ContentType",
                             download_content,
                             DOWNLOAD_CONTENT_MAX);
 }
 
 }  // namespace download_stats