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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 "apps/field_trial_names.h"
#include "apps/pref_names.h"
#include "base/command_line.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/gpu/chrome_gpu_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/sync/one_click_signin_helper.h"
#include "chrome/common/chrome_switches.h"
#include "chrome/common/chrome_version_info.h"
#include "chrome/common/metrics/variations/variations_util.h"
#include "content/public/common/content_constants.h"
#include "net/spdy/spdy_session.h"
#include "ui/base/layout.h"
#if defined(OS_WIN)
#include "net/socket/tcp_client_socket_win.h"
#endif // defined(OS_WIN)
namespace chrome {
namespace {
void SetupAppLauncherFieldTrial(PrefService* local_state) {
if (base::FieldTrialList::FindFullName(apps::kLauncherPromoTrialName) ==
apps::kResetShowLauncherPromoPrefGroupName) {
local_state->SetBoolean(apps::prefs::kShowAppLauncherPromo, true);
}
}
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, NULL));
trial->UseOneTimeRandomization();
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 or if browser frame avatar menu is
// always hidden (Chrome OS).
bool avatar_menu_always_hidden = false;
#if defined(OS_CHROMEOS)
avatar_menu_always_hidden = true;
#endif
base::FieldTrial* trial = base::FieldTrialList::Find("ShowProfileSwitcher");
if (trial && (!profiles::IsMultipleProfilesEnabled() ||
avatar_menu_always_hidden)) {
trial->Disable();
}
}
void SetupCacheSensitivityAnalysisFieldTrial() {
const base::FieldTrial::Probability kDivisor = 100;
base::FieldTrial::Probability sensitivity_analysis_probability = 0;
#if defined(OS_ANDROID)
switch (chrome::VersionInfo::GetChannel()) {
case chrome::VersionInfo::CHANNEL_DEV:
sensitivity_analysis_probability = 10;
break;
case chrome::VersionInfo::CHANNEL_BETA:
sensitivity_analysis_probability = 5;
break;
case chrome::VersionInfo::CHANNEL_STABLE:
sensitivity_analysis_probability = 1;
break;
default:
break;
}
#endif
scoped_refptr<base::FieldTrial> trial(
base::FieldTrialList::FactoryGetFieldTrial("CacheSensitivityAnalysis",
kDivisor, "No",
2013, 06, 15, NULL));
trial->AppendGroup("ControlA", sensitivity_analysis_probability);
trial->AppendGroup("ControlB", sensitivity_analysis_probability);
trial->AppendGroup("100A", sensitivity_analysis_probability);
trial->AppendGroup("100B", sensitivity_analysis_probability);
trial->AppendGroup("200A", sensitivity_analysis_probability);
trial->AppendGroup("200B", sensitivity_analysis_probability);
// TODO(gavinp,rvargas): Re-add 400 group to field trial if results justify.
}
void WindowsOverlappedTCPReadsFieldTrial(
const CommandLine& parsed_command_line) {
#if defined(OS_WIN)
if (parsed_command_line.HasSwitch(switches::kOverlappedRead)) {
std::string option =
parsed_command_line.GetSwitchValueASCII(switches::kOverlappedRead);
if (LowerCaseEqualsASCII(option, "off"))
net::TCPClientSocketWin::DisableOverlappedReads();
} else {
const base::FieldTrial::Probability kDivisor = 2; // 1 in 2 chance
const base::FieldTrial::Probability kOverlappedReadProbability = 1;
scoped_refptr<base::FieldTrial> overlapped_reads_trial(
base::FieldTrialList::FactoryGetFieldTrial("OverlappedReadImpact",
kDivisor, "OverlappedReadEnabled", 2013, 6, 1, NULL));
int overlapped_reads_disabled_group =
overlapped_reads_trial->AppendGroup("OverlappedReadDisabled",
kOverlappedReadProbability);
int assigned_group = overlapped_reads_trial->group();
if (assigned_group == overlapped_reads_disabled_group)
net::TCPClientSocketWin::DisableOverlappedReads();
}
#endif
}
void SetupLowLatencyFlashAudioFieldTrial() {
scoped_refptr<base::FieldTrial> trial(
base::FieldTrialList::FactoryGetFieldTrial(
content::kLowLatencyFlashAudioFieldTrialName,
100, "Standard", 2013, 9, 1, NULL));
// Trial is enabled for dev / beta / canary users only.
if (chrome::VersionInfo::GetChannel() != chrome::VersionInfo::CHANNEL_STABLE)
trial->AppendGroup(content::kLowLatencyFlashAudioFieldTrialEnabledName, 25);
}
} // namespace
void SetupDesktopFieldTrials(const CommandLine& parsed_command_line,
const base::Time& install_time,
PrefService* local_state) {
prerender::ConfigurePrefetchAndPrerender(parsed_command_line);
AutoLaunchChromeFieldTrial();
gpu_util::InitializeCompositingFieldTrial();
OmniboxFieldTrial::ActivateStaticTrials();
SetupInfiniteCacheFieldTrial();
SetupCacheSensitivityAnalysisFieldTrial();
DisableShowProfileSwitcherTrialIfNecessary();
WindowsOverlappedTCPReadsFieldTrial(parsed_command_line);
SetupAppLauncherFieldTrial(local_state);
SetupLowLatencyFlashAudioFieldTrial();
}
} // namespace chrome
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