Add UMA stats to track whitelist download latency.

components/autofill/browser/autofill_metrics.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 "components/autofill/browser/autofill_metrics.h"
 
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/time.h"
 #include "components/autofill/browser/autofill_type.h"
@@ skipping 430 matching lines @@
 
     case AUTOCHECKOUT_SUCCEEDED:
       suffix = "Succeeded";
       break;
   }
 
   LogUMAHistogramLongTimes("Autocheckout.FlowDuration", duration);
   LogUMAHistogramLongTimes("Autocheckout.FlowDuration." + suffix, duration);
 }
 
+void AutofillMetrics::LogAutocheckoutWhitelistDownloadDuration(
+    const base::TimeDelta& duration, WhitelistDownloadStatus status) const {
+  std::string suffix;
+  switch (status) {
+    case WHITELIST_DOWNLOAD_FAILED:
+      suffix = "Failed";
+      break;
+
+    case WHITELIST_DOWNLOAD_SUCCEEDED:
+      suffix = "Succeeded";
+      break;
+  }
+
+  LogUMAHistogramLongTimes("Autocheckout.WhitelistDownloadDuration", duration);

[ahutter, 2013/04/16 17:56:54]

I think you want to use LogUMAHistogramTimes since this isn't going to be a long
running call.

[benquan, 2013/04/17 01:51:30]

Done.

+  LogUMAHistogramLongTimes(
+      "Autocheckout.WhitelistDownloadDuration." + suffix, duration);
+}
+
 void AutofillMetrics::LogDeveloperEngagementMetric(
     DeveloperEngagementMetric metric) const {
   DCHECK_LT(metric, NUM_DEVELOPER_ENGAGEMENT_METRICS);
 
   UMA_HISTOGRAM_ENUMERATION("Autofill.DeveloperEngagement", metric,
                             NUM_DEVELOPER_ENGAGEMENT_METRICS);
 }
 
 void AutofillMetrics::LogHeuristicTypePrediction(
     FieldTypeQualityMetric metric,
@@ skipping 105 matching lines @@
     const std::string& experiment_id) const {
   LogServerExperimentId("Autofill.ServerExperimentId.Query", experiment_id);
 }
 
 void AutofillMetrics::LogServerExperimentIdForUpload(
     const std::string& experiment_id) const {
   LogServerExperimentId("Autofill.ServerExperimentId.Upload", experiment_id);
 }
 
 }  // namespace autofill