1 // Copyright 2013 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/chrome_browser_field_trials_mobile.h" 6 7 #include <string> 8 9 #include "base/command_line.h" 10 #include "base/metrics/field_trial.h" 11 #include "base/prefs/pref_service.h" 12 #include "chrome/common/chrome_switches.h" 13 #include "chrome/common/chrome_version_info.h" 14 15 #if defined(OS_ANDROID) 16 #include "chrome/browser/prerender/prerender_field_trial.h" 17 #endif 18 19 namespace chrome { 20 21 namespace { 22 23 // Base function used by all data reduction proxy field trials. A trial is 24 // only conducted for installs that are in the "Enabled" group. They are always 25 // enabled on DEV and BETA channels, and for STABLE, a percentage will be 26 // controlled from the server. Until the percentage is learned from the server, 27 // a client-side configuration is used. 28 void DataCompressionProxyBaseFieldTrial( 29 const char* trial_name, 30 const base::FieldTrial::Probability enabled_group_probability, 31 const base::FieldTrial::Probability total_probability) { 32 const char kEnabled[] = "Enabled"; 33 const char kDisabled[] = "Disabled"; 34 35 // Find out if this is a stable channel. 36 const bool kIsStableChannel = 37 chrome::VersionInfo::GetChannel() == chrome::VersionInfo::CHANNEL_STABLE; 38 39 // Experiment enabled until Jan 1, 2015. By default, disabled. 40 scoped_refptr<base::FieldTrial> trial( 41 base::FieldTrialList::FactoryGetFieldTrial( 42 trial_name, 43 total_probability, 44 kDisabled, 2015, 1, 1, base::FieldTrial::ONE_TIME_RANDOMIZED, NULL)); 45 46 // Non-stable channels will run with probability 1. 47 trial->AppendGroup( 48 kEnabled, 49 kIsStableChannel ? enabled_group_probability : total_probability); 50 51 trial->group(); 52 } 53 54 void SetupDataCompressionProxyFieldTrials() { 55 // Governs the rollout of the _promo_ for the compression proxy 56 // independently from the rollout of compression proxy. The enabled 57 // percentage is configured to be 10% = 100 / 1000 until overridden by the 58 // server. When this trial is "Enabled," users get a promo, whereas 59 // otherwise, compression is available without a promo. 60 DataCompressionProxyBaseFieldTrial( 61 "DataCompressionProxyPromoVisibility", 100, 1000); 62 } 63 64 } // namespace 65 66 void SetupMobileFieldTrials(const CommandLine& parsed_command_line) { 67 SetupDataCompressionProxyFieldTrials(); 68 #if defined(OS_ANDROID) 69 prerender::ConfigurePrerender(parsed_command_line); 70 #endif 71 } 72 73 } // namespace chrome 74