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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/chrome_browser_field_trials_desktop.h"
#include <string>
#include "base/command_line.h"
#include "base/environment.h"
#include "base/metrics/field_trial.h"
#include "base/prefs/pref_service.h"
#include "base/strings/string_util.h"
#include "chrome/browser/auto_launch_trial.h"
#include "chrome/browser/google/google_util.h"
#include "chrome/browser/omnibox/omnibox_field_trial.h"
#include "chrome/browser/prerender/prerender_field_trial.h"
#include "chrome/browser/profiles/profiles_state.h"
#include "chrome/browser/safe_browsing/safe_browsing_blocking_page.h"
#include "chrome/browser/ui/app_list/app_list_util.h"
#include "chrome/browser/ui/sync/one_click_signin_helper.h"
#include "chrome/common/chrome_constants.h"
#include "chrome/common/chrome_switches.h"
#include "chrome/common/chrome_version_info.h"
#include "chrome/common/metrics/variations/variations_util.h"
#include "chrome/common/pref_names.h"
#include "content/public/common/content_constants.h"
#include "net/spdy/spdy_session.h"
#include "ui/base/layout.h"
namespace chrome {
namespace {
void AutoLaunchChromeFieldTrial() {
std::string brand;
google_util::GetBrand(&brand);
// Create a 100% field trial based on the brand code.
if (auto_launch_trial::IsInExperimentGroup(brand)) {
base::FieldTrialList::CreateFieldTrial(kAutoLaunchTrialName,
kAutoLaunchTrialAutoLaunchGroup);
} else if (auto_launch_trial::IsInControlGroup(brand)) {
base::FieldTrialList::CreateFieldTrial(kAutoLaunchTrialName,
kAutoLaunchTrialControlGroup);
}
}
void SetupInfiniteCacheFieldTrial() {
const base::FieldTrial::Probability kDivisor = 100;
base::FieldTrial::Probability infinite_cache_probability = 0;
scoped_refptr<base::FieldTrial> trial(
base::FieldTrialList::FactoryGetFieldTrial(
"InfiniteCache", kDivisor, "No", 2013, 12, 31,
base::FieldTrial::ONE_TIME_RANDOMIZED, NULL));
trial->AppendGroup("Yes", infinite_cache_probability);
trial->AppendGroup("Control", infinite_cache_probability);
}
void DisableShowProfileSwitcherTrialIfNecessary() {
// This trial is created by the VariationsService, but it needs to be disabled
// if multi-profiles isn't enabled.
base::FieldTrial* trial = base::FieldTrialList::Find("ShowProfileSwitcher");
if (trial && !profiles::IsMultipleProfilesEnabled())
trial->Disable();
}
void SetupLowLatencyFlashAudioFieldTrial() {
scoped_refptr<base::FieldTrial> trial(
base::FieldTrialList::FactoryGetFieldTrial(
content::kLowLatencyFlashAudioFieldTrialName, 100, "Standard",
2013, 9, 1, base::FieldTrial::SESSION_RANDOMIZED, NULL));
// Trial is enabled for dev / beta / canary users only.
if (chrome::VersionInfo::GetChannel() != chrome::VersionInfo::CHANNEL_STABLE)
trial->AppendGroup(content::kLowLatencyFlashAudioFieldTrialEnabledName, 25);
}
void SetupPreReadFieldTrial() {
// The chrome executable will have set (or not) an environment variable with
// the group name into which this client belongs.
std::string group;
scoped_ptr<base::Environment> env(base::Environment::Create());
if (!env->GetVar(chrome::kPreReadEnvironmentVariable, &group) ||
group.empty()) {
return;
}
// Initialize the field trial. We declare all of the groups here (so that
// the dashboard creation tools can find them) but force the probability
// of being assigned to the group already chosen by the executable, if any,
// to 100%.
scoped_refptr<base::FieldTrial> trial(
base::FieldTrialList::FactoryGetFieldTrial(
"BrowserPreReadExperiment", 100, "100-pct-default",
2014, 7, 1, base::FieldTrial::SESSION_RANDOMIZED, NULL));
trial->AppendGroup("100-pct-control", group == "100-pct-control" ? 100 : 0);
trial->AppendGroup("95-pct", group == "95-pct" ? 100 : 0);
trial->AppendGroup("90-pct", group == "90-pct" ? 100 : 0);
trial->AppendGroup("85-pct", group == "85-pct" ? 100 : 0);
trial->AppendGroup("80-pct", group == "80-pct" ? 100 : 0);
trial->AppendGroup("75-pct", group == "75-pct" ? 100 : 0);
trial->AppendGroup("70-pct", group == "70-pct" ? 100 : 0);
trial->AppendGroup("65-pct", group == "65-pct" ? 100 : 0);
trial->AppendGroup("60-pct", group == "60-pct" ? 100 : 0);
trial->AppendGroup("55-pct", group == "55-pct" ? 100 : 0);
trial->AppendGroup("50-pct", group == "50-pct" ? 100 : 0);
trial->AppendGroup("45-pct", group == "45-pct" ? 100 : 0);
trial->AppendGroup("40-pct", group == "40-pct" ? 100 : 0);
trial->AppendGroup("35-pct", group == "35-pct" ? 100 : 0);
trial->AppendGroup("30-pct", group == "30-pct" ? 100 : 0);
trial->AppendGroup("25-pct", group == "25-pct" ? 100 : 0);
trial->AppendGroup("20-pct", group == "20-pct" ? 100 : 0);
trial->AppendGroup("15-pct", group == "15-pct" ? 100 : 0);
trial->AppendGroup("10-pct", group == "10-pct" ? 100 : 0);
trial->AppendGroup("5-pct", group == "5-pct" ? 100 : 0);
trial->AppendGroup("0-pct", group == "0-pct" ? 100 : 0);
// We have to call group in order to mark the experiment as active.
trial->group();
}
} // namespace
void SetupDesktopFieldTrials(const CommandLine& parsed_command_line,
const base::Time& install_time,
PrefService* local_state) {
prerender::ConfigurePrefetchAndPrerender(parsed_command_line);
AutoLaunchChromeFieldTrial();
OmniboxFieldTrial::ActivateStaticTrials();
SetupInfiniteCacheFieldTrial();
DisableShowProfileSwitcherTrialIfNecessary();
SetupShowAppLauncherPromoFieldTrial(local_state);
SetupLowLatencyFlashAudioFieldTrial();
SetupPreReadFieldTrial();
}
} // namespace chrome
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