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/metrics/field_trial.h"
  11 #include "base/strings/string_util.h"
  12 #include "chrome/browser/auto_launch_trial.h"
  13 #include "chrome/browser/google/google_brand.h"
  14 #include "chrome/browser/prerender/prerender_field_trial.h"
  15 #include "chrome/browser/profiles/profiles_state.h"
  16 #include "chrome/browser/safe_browsing/safe_browsing_blocking_page.h"
  17 #include "chrome/common/chrome_switches.h"
  18 #include "chrome/common/chrome_version_info.h"
  19 #include "chrome/common/variations/variations_util.h"
  20 #include "components/variations/variations_associated_data.h"
  21 #include "content/public/common/content_constants.h"
  22 #include "net/spdy/spdy_session.h"
  23 #include "ui/base/layout.h"
  24
  25 namespace chrome {
  26
  27 namespace {
  28
  29 void AutoLaunchChromeFieldTrial() {
  30   std::string brand;
  31   google_brand::GetBrand(&brand);
  32
  33   // Create a 100% field trial based on the brand code.
  34   if (auto_launch_trial::IsInExperimentGroup(brand)) {
  35     base::FieldTrialList::CreateFieldTrial(kAutoLaunchTrialName,
  36                                            kAutoLaunchTrialAutoLaunchGroup);
  37   } else if (auto_launch_trial::IsInControlGroup(brand)) {
  38     base::FieldTrialList::CreateFieldTrial(kAutoLaunchTrialName,
  39                                            kAutoLaunchTrialControlGroup);
  40   }
  41 }
  42
  43 void SetupInfiniteCacheFieldTrial() {
  44   const base::FieldTrial::Probability kDivisor = 100;
  45
  46   base::FieldTrial::Probability infinite_cache_probability = 0;
  47
  48   scoped_refptr<base::FieldTrial> trial(
  49       base::FieldTrialList::FactoryGetFieldTrial(
  50           "InfiniteCache", kDivisor, "No", 2013, 12, 31,
  51           base::FieldTrial::ONE_TIME_RANDOMIZED, NULL));
  52   trial->AppendGroup("Yes", infinite_cache_probability);
  53   trial->AppendGroup("Control", infinite_cache_probability);
  54 }
  55
  56 void DisableShowProfileSwitcherTrialIfNecessary() {
  57   // This trial is created by the VariationsService, but it needs to be disabled
  58   // if multi-profiles isn't enabled.
  59   base::FieldTrial* trial = base::FieldTrialList::Find("ShowProfileSwitcher");
  60   if (trial && !profiles::IsMultipleProfilesEnabled())
  61     trial->Disable();
  62 }
  63
  64 void SetupLightSpeedTrials() {
  65   if (!variations::GetVariationParamValue("LightSpeed", "NoGpu").empty()) {
  66     base::CommandLine::ForCurrentProcess()->AppendSwitch(
  67         switches::kDisableGpu);
  68   }
  69 }
  70
  71 }  // namespace
  72
  73 void SetupDesktopFieldTrials(const base::CommandLine& parsed_command_line) {
  74   prerender::ConfigurePrerender(parsed_command_line);
  75   AutoLaunchChromeFieldTrial();
  76   SetupInfiniteCacheFieldTrial();
  77   DisableShowProfileSwitcherTrialIfNecessary();
  78   SetupLightSpeedTrials();
  79 }
  80
  81 }  // namespace chrome