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