1 // Copyright 2014 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "chrome/browser/prefetch/prefetch.h" 6 7 #include <string> 8 9 #include "base/metrics/field_trial.h" 10 #include "base/strings/string_util.h" 11 #include "chrome/browser/prefetch/prefetch_field_trial.h" 12 #include "chrome/browser/profiles/profile_io_data.h" 13 #include "net/base/network_change_notifier.h" 14 15 namespace prefetch { 16 IsPrefetchEnabled(content::ResourceContext * resource_context)17bool IsPrefetchEnabled(content::ResourceContext* resource_context) { 18 DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::IO)); 19 20 // TODO(jkarlin): Eventually tie this to a new Chrome preference to predict 21 // network actions when on cellular connections. See crbug.com/370454. 22 if (net::NetworkChangeNotifier::IsConnectionCellular( 23 net::NetworkChangeNotifier::GetConnectionType())) 24 return false; 25 26 ProfileIOData* io_data = ProfileIOData::FromResourceContext(resource_context); 27 if (io_data != NULL && io_data->network_prediction_enabled()->GetValue()) 28 return IsPrefetchFieldTrialEnabled(); 29 return false; 30 } 31 32 } // namespace prefetch 33