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// Copyright (c) 2012 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.h"
#include <string>
#include "base/command_line.h"
#include "base/metrics/field_trial.h"
#include "base/prefs/pref_service.h"
#include "base/string_util.h"
#include "base/time.h"
#include "chrome/browser/omnibox/omnibox_field_trial.h"
#include "chrome/common/chrome_switches.h"
#include "chrome/common/chrome_version_info.h"
#include "chrome/common/metrics/variations/uniformity_field_trials.h"
#include "chrome/common/pref_names.h"
#if defined(OS_ANDROID) || defined(OS_IOS)
#include "chrome/browser/chrome_browser_field_trials_mobile.h"
#else
#include "chrome/browser/chrome_browser_field_trials_desktop.h"
#endif
ChromeBrowserFieldTrials::ChromeBrowserFieldTrials(
const CommandLine& parsed_command_line)
: parsed_command_line_(parsed_command_line) {
}
ChromeBrowserFieldTrials::~ChromeBrowserFieldTrials() {
}
void ChromeBrowserFieldTrials::SetupFieldTrials(PrefService* local_state) {
const base::Time install_time = base::Time::FromTimeT(
local_state->GetInt64(prefs::kInstallDate));
DCHECK(!install_time.is_null());
// Field trials that are shared by all platforms.
chrome_variations::SetupUniformityFieldTrials(install_time);
SetUpSimpleCacheFieldTrial();
InstantiateDynamicTrials();
#if defined(OS_ANDROID) || defined(OS_IOS)
chrome::SetupMobileFieldTrials(
parsed_command_line_, install_time, local_state);
#else
chrome::SetupDesktopFieldTrials(
parsed_command_line_, install_time, local_state);
#endif
}
// Sets up the experiment. The actual cache backend choice is made in the net/
// internals by looking at the experiment state.
void ChromeBrowserFieldTrials::SetUpSimpleCacheFieldTrial() {
const std::string opt_value = parsed_command_line_.GetSwitchValueASCII(
switches::kUseSimpleCacheBackend);
const base::FieldTrial::Probability kDivisor = 100;
scoped_refptr<base::FieldTrial> trial(
base::FieldTrialList::FactoryGetFieldTrial("SimpleCacheTrial", kDivisor,
"ExperimentNo", 2013, 12, 31,
NULL));
trial->UseOneTimeRandomization();
if (LowerCaseEqualsASCII(opt_value, "off")) {
trial->AppendGroup("ExplicitNo", kDivisor);
trial->group();
return;
}
if (LowerCaseEqualsASCII(opt_value, "on")) {
trial->AppendGroup("ExplicitYes", kDivisor);
trial->group();
return;
}
#if defined(OS_ANDROID)
base::FieldTrial::Probability simple_cache_experiment_probability = 0;
base::FieldTrial::Probability simple_cache_experiment2_probability = 0;
base::FieldTrial::Probability simple_cache_control_probability = 0;
switch (chrome::VersionInfo::GetChannel()) {
case chrome::VersionInfo::CHANNEL_DEV:
simple_cache_experiment_probability = 45;
simple_cache_control_probability = 45;
break;
case chrome::VersionInfo::CHANNEL_BETA:
simple_cache_experiment_probability = 80;
simple_cache_experiment2_probability = 10;
simple_cache_control_probability = 10;
break;
default:
break;
}
trial->AppendGroup("ExperimentYes", simple_cache_experiment_probability);
trial->AppendGroup("ExperimentYes2", simple_cache_experiment2_probability);
trial->AppendGroup("ExperimentControl", simple_cache_control_probability);
#endif
trial->group();
}
void ChromeBrowserFieldTrials::InstantiateDynamicTrials() {
// Call |FindValue()| on the trials below, which may come from the server, to
// ensure they get marked as "used" for the purposes of data reporting.
base::FieldTrialList::FindValue("UMA-Dynamic-Binary-Uniformity-Trial");
base::FieldTrialList::FindValue("UMA-Dynamic-Uniformity-Trial");
base::FieldTrialList::FindValue("InstantDummy");
base::FieldTrialList::FindValue("InstantChannel");
base::FieldTrialList::FindValue("Test0PercentDefault");
// Activate the autocomplete dynamic field trials.
OmniboxFieldTrial::ActivateDynamicTrials();
}
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