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      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 
     17 bool 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