Check if precaching is allowed before reporting related metrics

chrome/browser/net/chrome_network_delegate.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 "chrome/browser/net/chrome_network_delegate.h"
 
 #include <stdlib.h>
 
 #include <vector>
 
@@ skipping 199 matching lines @@
                                    bool was_cached, void* profile_id) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   Profile* profile = reinterpret_cast<Profile*>(profile_id);
   if (!g_browser_process->profile_manager()->IsValidProfile(profile)) {
     return;
   }
 
   precache::PrecacheManager* precache_manager =
       precache::PrecacheManagerFactory::GetForBrowserContext(profile);
-  if (!precache_manager) {
-    // This could be NULL if the profile is off the record.
+  if (!precache_manager || !precache_manager->IsPrecachingAllowed()) {
+    // |precache_manager| could be NULL if the profile is off the record.
     return;
   }
 
   precache_manager->RecordStatsForFetch(url, fetch_time, size, was_cached);
 }
 
 void RecordIOThreadToRequestStartOnUIThread(
     const base::TimeTicks& request_start) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   base::TimeDelta request_lag = request_start -
@@ skipping 585 matching lines @@
     data_reduction_proxy::DataReductionProxyRequestType request_type) {
   DCHECK_GE(received_content_length, 0);
   DCHECK_GE(original_content_length, 0);
   StoreAccumulatedContentLength(received_content_length,
                                 original_content_length,
                                 request_type,
                                 reinterpret_cast<Profile*>(profile_));
   received_content_length_ += received_content_length;
   original_content_length_ += original_content_length;
 }