Add UMA stats to track whitelist download latency.

components/autofill/browser/autocheckout/whitelist_manager.cc

Index: components/autofill/browser/autocheckout/whitelist_manager.cc
diff --git a/components/autofill/browser/autocheckout/whitelist_manager.cc b/components/autofill/browser/autocheckout/whitelist_manager.cc
index aeb60f113393bfbe12ee93af31708c6632f2588a..583c7e33e1554a7bc7d2cb6147234963b1cce925 100644
--- a/components/autofill/browser/autocheckout/whitelist_manager.cc
+++ b/components/autofill/browser/autocheckout/whitelist_manager.cc
@@ -55,6 +55,10 @@ void WhitelistManager::Init(net::URLRequestContextGetter* context_getter) {
   ScheduleDownload(kInitialDownloadDelaySeconds);
 }
 
+const AutofillMetrics& WhitelistManager::GetMetricLogger() const {
+  return metrics_logger_;
+}

[Ilya Sherman, 2013/04/17 05:01:48]

nit: Please order this so that its sorted the same in the header and in the
implementation file.

[benquan, 2013/04/17 05:48:18]

Done.

+
 void WhitelistManager::ScheduleDownload(size_t interval_seconds) {
   if (!experimental_form_filling_enabled_) {
     // The feature is not enabled: do not do the request.
@@ -77,6 +81,8 @@ void WhitelistManager::StartDownloadTimer(size_t interval_seconds) {
 void WhitelistManager::TriggerDownload() {
   callback_is_pending_ = true;
 
+  request_started_timestamp_ = base::Time::Now();
+
   request_.reset(net::URLFetcher::Create(
       0, GURL(kWhitelistUrl), net::URLFetcher::GET, this));
   request_->SetRequestContext(context_getter_);
@@ -99,9 +105,16 @@ void WhitelistManager::OnURLFetchComplete(
   DCHECK_EQ(source, old_request.get());
 
   if (source->GetResponseCode() == net::HTTP_OK) {
+    GetMetricLogger().LogAutocheckoutWhitelistDownloadDuration(
+        base::Time::Now() - request_started_timestamp_,
+        AutofillMetrics::AUTOCHECKOUT_WHITELIST_DOWNLOAD_SUCCEEDED);
     std::string data;
     source->GetResponseAsString(&data);
     BuildWhitelist(data);
+  } else {
+    GetMetricLogger().LogAutocheckoutWhitelistDownloadDuration(
+        base::Time::Now() - request_started_timestamp_,
+        AutofillMetrics::AUTOCHECKOUT_WHITELIST_DOWNLOAD_FAILED);
   }
 
   ScheduleDownload(kDownloadIntervalSeconds);