chrome/browser/chrome_browser_field_trials_desktop.cc

   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_desktop.h"
   6
   7 #include <string>
   8
   9 #include "base/command_line.h"
  10 #include "base/environment.h"
  11 #include "base/metrics/field_trial.h"
  12 #include "base/prefs/pref_service.h"
  13 #include "base/strings/string_util.h"
  14 #include "chrome/browser/auto_launch_trial.h"
  15 #include "chrome/browser/google/google_util.h"
  16 #include "chrome/browser/omnibox/omnibox_field_trial.h"
  17 #include "chrome/browser/prerender/prerender_field_trial.h"
  18 #include "chrome/browser/profiles/profiles_state.h"
  19 #include "chrome/browser/safe_browsing/safe_browsing_blocking_page.h"
  20 #include "chrome/browser/ui/app_list/app_list_util.h"
  21 #include "chrome/browser/ui/sync/one_click_signin_helper.h"
  22 #include "chrome/common/chrome_constants.h"
  23 #include "chrome/common/chrome_switches.h"
  24 #include "chrome/common/chrome_version_info.h"
  25 #include "chrome/common/metrics/variations/variations_util.h"
  26 #include "chrome/common/pref_names.h"
  27 #include "content/public/common/content_constants.h"
  28 #include "net/spdy/spdy_session.h"
  29 #include "ui/base/layout.h"
  30
  31 namespace chrome {
  32
  33 namespace {
  34
  35 void AutoLaunchChromeFieldTrial() {
  36   std::string brand;
  37   google_util::GetBrand(&brand);
  38
  39   // Create a 100% field trial based on the brand code.
  40   if (auto_launch_trial::IsInExperimentGroup(brand)) {
  41     base::FieldTrialList::CreateFieldTrial(kAutoLaunchTrialName,
  42                                            kAutoLaunchTrialAutoLaunchGroup);
  43   } else if (auto_launch_trial::IsInControlGroup(brand)) {
  44     base::FieldTrialList::CreateFieldTrial(kAutoLaunchTrialName,
  45                                            kAutoLaunchTrialControlGroup);
  46   }
  47 }
  48
  49 void SetupInfiniteCacheFieldTrial() {
  50   const base::FieldTrial::Probability kDivisor = 100;
  51
  52   base::FieldTrial::Probability infinite_cache_probability = 0;
  53
  54   scoped_refptr<base::FieldTrial> trial(
  55       base::FieldTrialList::FactoryGetFieldTrial(
  56           "InfiniteCache", kDivisor, "No", 2013, 12, 31,
  57           base::FieldTrial::ONE_TIME_RANDOMIZED, NULL));
  58   trial->AppendGroup("Yes", infinite_cache_probability);
  59   trial->AppendGroup("Control", infinite_cache_probability);
  60 }
  61
  62 void DisableShowProfileSwitcherTrialIfNecessary() {
  63   // This trial is created by the VariationsService, but it needs to be disabled
  64   // if multi-profiles isn't enabled.
  65   base::FieldTrial* trial = base::FieldTrialList::Find("ShowProfileSwitcher");
  66   if (trial && !profiles::IsMultipleProfilesEnabled())
  67     trial->Disable();
  68 }
  69
  70 void SetupLowLatencyFlashAudioFieldTrial() {
  71   scoped_refptr<base::FieldTrial> trial(
  72       base::FieldTrialList::FactoryGetFieldTrial(
  73           content::kLowLatencyFlashAudioFieldTrialName, 100, "Standard",
  74           2013, 9, 1, base::FieldTrial::SESSION_RANDOMIZED, NULL));
  75
  76   // Trial is enabled for dev / beta / canary users only.
  77   if (chrome::VersionInfo::GetChannel() != chrome::VersionInfo::CHANNEL_STABLE)
  78     trial->AppendGroup(content::kLowLatencyFlashAudioFieldTrialEnabledName, 25);
  79 }
  80
  81 void SetupPreReadFieldTrial() {
  82   // The chrome executable will have set (or not) an environment variable with
  83   // the group name into which this client belongs.
  84   std::string group;
  85   scoped_ptr<base::Environment> env(base::Environment::Create());
  86   if (!env->GetVar(chrome::kPreReadEnvironmentVariable, &group) ||
  87       group.empty()) {
  88     return;
  89   }
  90
  91   // Initialize the field trial. We declare all of the groups here (so that
  92   // the dashboard creation tools can find them) but force the probability
  93   // of being assigned to the group already chosen by the executable, if any,
  94   // to 100%.
  95   scoped_refptr<base::FieldTrial> trial(
  96       base::FieldTrialList::FactoryGetFieldTrial(
  97           "BrowserPreReadExperiment", 100, "100-pct-default",
  98           2014, 7, 1, base::FieldTrial::SESSION_RANDOMIZED, NULL));
  99   trial->AppendGroup("100-pct-control", group == "100-pct-control" ? 100 : 0);
 100   trial->AppendGroup("95-pct", group == "95-pct" ? 100 : 0);
 101   trial->AppendGroup("90-pct", group == "90-pct" ? 100 : 0);
 102   trial->AppendGroup("85-pct", group == "85-pct" ? 100 : 0);
 103   trial->AppendGroup("80-pct", group == "80-pct" ? 100 : 0);
 104   trial->AppendGroup("75-pct", group == "75-pct" ? 100 : 0);
 105   trial->AppendGroup("70-pct", group == "70-pct" ? 100 : 0);
 106   trial->AppendGroup("65-pct", group == "65-pct" ? 100 : 0);
 107   trial->AppendGroup("60-pct", group == "60-pct" ? 100 : 0);
 108   trial->AppendGroup("55-pct", group == "55-pct" ? 100 : 0);
 109   trial->AppendGroup("50-pct", group == "50-pct" ? 100 : 0);
 110   trial->AppendGroup("45-pct", group == "45-pct" ? 100 : 0);
 111   trial->AppendGroup("40-pct", group == "40-pct" ? 100 : 0);
 112   trial->AppendGroup("35-pct", group == "35-pct" ? 100 : 0);
 113   trial->AppendGroup("30-pct", group == "30-pct" ? 100 : 0);
 114   trial->AppendGroup("25-pct", group == "25-pct" ? 100 : 0);
 115   trial->AppendGroup("20-pct", group == "20-pct" ? 100 : 0);
 116   trial->AppendGroup("15-pct", group == "15-pct" ? 100 : 0);
 117   trial->AppendGroup("10-pct", group == "10-pct" ? 100 : 0);
 118   trial->AppendGroup("5-pct", group == "5-pct" ? 100 : 0);
 119   trial->AppendGroup("0-pct", group == "0-pct" ? 100 : 0);
 120
 121   // We have to call group in order to mark the experiment as active.
 122   trial->group();
 123 }
 124
 125 }  // namespace
 126
 127 void SetupDesktopFieldTrials(const CommandLine& parsed_command_line,
 128                              const base::Time& install_time,
 129                              PrefService* local_state) {
 130   prerender::ConfigurePrerender(parsed_command_line);
 131   AutoLaunchChromeFieldTrial();
 132   OmniboxFieldTrial::ActivateStaticTrials();
 133   SetupInfiniteCacheFieldTrial();
 134   DisableShowProfileSwitcherTrialIfNecessary();
 135   SetupShowAppLauncherPromoFieldTrial(local_state);
 136   SetupLowLatencyFlashAudioFieldTrial();
 137   SetupPreReadFieldTrial();
 138 }
 139
 140 }  // namespace chrome