Add Precache.CacheStatus.Prefetch UMA.

components/precache/core/precache_database.cc

 // Copyright 2013 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/precache/core/precache_database.h"
 
+#include <utility>
+
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/location.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/time/time.h"
 #include "components/history/core/browser/history_constants.h"
 #include "components/precache/core/proto/unfinished_work.pb.h"
 #include "net/http/http_response_headers.h"
@@ skipping 127 matching lines @@
                                                 downloaded_urls);
   precache_url_table_.SetDownloadReported(referrer_host_id);
 }
 
 void PrecacheDatabase::RecordURLPrefetchMetrics(
     const net::HttpResponseInfo& info,
     const base::TimeDelta& latency) {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   UMA_HISTOGRAM_TIMES("Precache.Latency.Prefetch", latency);
+  UMA_HISTOGRAM_ENUMERATION("Precache.CacheStatus.Prefetch",
+                            info.cache_entry_status,
+                            net::HttpResponseInfo::CacheEntryStatus::ENTRY_MAX);
 
   DCHECK(info.headers) << "The headers are required to get the freshness.";
   if (info.headers) {
     UMA_HISTOGRAM_CUSTOM_COUNTS(
         "Precache.Freshness.Prefetch",
         info.headers->GetFreshnessLifetimes(info.response_time)
             .freshness.InSeconds(),
         base::TimeDelta::FromMinutes(5).InSeconds() /* min */,
         base::TimeDelta::FromDays(356).InSeconds() /* max */,
         100 /* bucket_count */);
@@ skipping 289 matching lines @@
 
 PrecacheQuota PrecacheDatabase::GetQuota() {
   return precache_session_table_.GetQuota();
 }
 
 base::WeakPtr<PrecacheDatabase> PrecacheDatabase::GetWeakPtr() {
   return weak_factory_.GetWeakPtr();
 }
 
 }  // namespace precache