15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2012 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "chrome/browser/net/async_dns_field_trial.h" 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/metrics/field_trial.h" 8868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)#include "base/strings/string_util.h" 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "build/build_config.h" 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace chrome_browser_net { 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool ConfigureAsyncDnsFieldTrial() { 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#if defined(OS_ANDROID) || defined(OS_IOS) 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // There is no DnsConfigService on those platforms so disable the field trial. 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return false; 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 182a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 192a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#if defined(OS_CHROMEOS) || defined(OS_LINUX) || defined(OS_MACOSX) 202a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const bool kDefault = true; 212a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#else 222a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const bool kDefault = false; 232a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#endif 242a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Configure the AsyncDns field trial as follows: 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // groups AsyncDnsA and AsyncDnsB: return true, 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // groups SystemDnsA and SystemDnsB: return false, 282a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // otherwise (trial absent): return default. 292a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) std::string group_name = base::FieldTrialList::FindFullName("AsyncDns"); 302a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (!group_name.empty()) 312a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) return StartsWithASCII(group_name, "AsyncDns", false /* case_sensitive */); 322a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) return kDefault; 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace chrome_browser_net 36