// 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/chromeos/chrome_browser_main_chromeos.h" #include #include #include "ash/shell.h" #include "base/bind.h" #include "base/callback.h" #include "base/chromeos/chromeos_version.h" #include "base/command_line.h" #include "base/lazy_instance.h" #include "base/message_loop.h" #include "base/string_number_conversions.h" #include "base/string_split.h" #include "chrome/browser/browser_process.h" #include "chrome/browser/chromeos/audio/audio_handler.h" #include "chrome/browser/chromeos/boot_times_loader.h" #include "chrome/browser/chromeos/contacts/contact_manager.h" #include "chrome/browser/chromeos/cros/cros_library.h" #include "chrome/browser/chromeos/dbus/cros_dbus_service.h" #include "chrome/browser/chromeos/external_metrics.h" #include "chrome/browser/chromeos/imageburner/burn_manager.h" #include "chrome/browser/chromeos/input_method/input_method_manager.h" #include "chrome/browser/chromeos/input_method/xkeyboard.h" #include "chrome/browser/chromeos/kiosk_mode/kiosk_mode_idle_logout.h" #include "chrome/browser/chromeos/kiosk_mode/kiosk_mode_screensaver.h" #include "chrome/browser/chromeos/kiosk_mode/kiosk_mode_settings.h" #include "chrome/browser/chromeos/login/authenticator.h" #include "chrome/browser/chromeos/login/login_utils.h" #include "chrome/browser/chromeos/login/login_wizard.h" #include "chrome/browser/chromeos/login/screen_locker.h" #include "chrome/browser/chromeos/login/user_manager.h" #include "chrome/browser/chromeos/login/wallpaper_manager.h" #include "chrome/browser/chromeos/login/wizard_controller.h" #include "chrome/browser/chromeos/low_memory_observer.h" #include "chrome/browser/chromeos/mtp/media_transfer_protocol_manager.h" #include "chrome/browser/chromeos/net/cros_network_change_notifier_factory.h" #include "chrome/browser/chromeos/net/network_change_notifier_chromeos.h" #include "chrome/browser/chromeos/oom_priority_manager.h" #include "chrome/browser/chromeos/power/brightness_observer.h" #include "chrome/browser/chromeos/power/output_observer.h" #include "chrome/browser/chromeos/power/power_button_controller_delegate_chromeos.h" #include "chrome/browser/chromeos/power/power_button_observer.h" #include "chrome/browser/chromeos/power/power_state_override.h" #include "chrome/browser/chromeos/power/resume_observer.h" #include "chrome/browser/chromeos/power/screen_dimming_observer.h" #include "chrome/browser/chromeos/power/screen_lock_observer.h" #include "chrome/browser/chromeos/power/user_activity_notifier.h" #include "chrome/browser/chromeos/power/video_activity_notifier.h" #include "chrome/browser/chromeos/settings/device_settings_service.h" #include "chrome/browser/chromeos/settings/owner_key_util.h" #include "chrome/browser/chromeos/system/statistics_provider.h" #include "chrome/browser/chromeos/system_key_event_listener.h" #include "chrome/browser/chromeos/upgrade_detector_chromeos.h" #include "chrome/browser/chromeos/web_socket_proxy_controller.h" #include "chrome/browser/chromeos/xinput_hierarchy_changed_event_listener.h" #include "chrome/browser/defaults.h" #include "chrome/browser/metrics/metrics_service.h" #include "chrome/browser/net/chrome_network_delegate.h" #include "chrome/browser/policy/browser_policy_connector.h" #include "chrome/browser/prefs/pref_service.h" #include "chrome/browser/profiles/profile.h" #include "chrome/browser/profiles/profile_manager.h" #include "chrome/browser/signin/token_service_factory.h" #include "chrome/browser/system_monitor/media_transfer_protocol_device_observer_chromeos.h" #include "chrome/browser/system_monitor/removable_device_notifications_chromeos.h" #include "chrome/common/chrome_notification_types.h" #include "chrome/common/chrome_switches.h" #include "chrome/common/chrome_version_info.h" #include "chrome/common/logging_chrome.h" #include "chrome/common/pref_names.h" #include "chromeos/cryptohome/async_method_caller.h" #include "chromeos/dbus/dbus_thread_manager.h" #include "chromeos/dbus/power_manager_client.h" #include "chromeos/dbus/session_manager_client.h" #include "chromeos/disks/disk_mount_manager.h" #include "chromeos/display/output_configurator.h" #include "content/public/browser/notification_service.h" #include "content/public/common/main_function_params.h" #include "grit/platform_locale_settings.h" #include "net/base/network_change_notifier.h" #include "net/url_request/url_request.h" class MessageLoopObserver : public MessageLoopForUI::Observer { virtual base::EventStatus WillProcessEvent( const base::NativeEvent& event) OVERRIDE { return base::EVENT_CONTINUE; } virtual void DidProcessEvent( const base::NativeEvent& event) OVERRIDE { } }; static base::LazyInstance g_message_loop_observer = LAZY_INSTANCE_INITIALIZER; // Login ----------------------------------------------------------------------- // Class is used to login using passed username and password. // The instance will be deleted upon success or failure. class StubLogin : public chromeos::LoginStatusConsumer, public chromeos::LoginUtils::Delegate { public: StubLogin(std::string username, std::string password) : pending_requests_(false), profile_prepared_(false) { authenticator_ = chromeos::LoginUtils::Get()->CreateAuthenticator(this); authenticator_.get()->AuthenticateToLogin( g_browser_process->profile_manager()->GetDefaultProfile(), username, password, std::string(), std::string()); } ~StubLogin() { chromeos::LoginUtils::Get()->DelegateDeleted(this); } void OnLoginFailure(const chromeos::LoginFailure& error) { LOG(ERROR) << "Login Failure: " << error.GetErrorString(); delete this; } void OnLoginSuccess(const std::string& username, const std::string& password, bool pending_requests, bool using_oauth) { pending_requests_ = pending_requests; if (!profile_prepared_) { // Will call OnProfilePrepared in the end. chromeos::LoginUtils::Get()->PrepareProfile(username, std::string(), password, pending_requests, using_oauth, false, this); } else if (!pending_requests) { delete this; } } // LoginUtils::Delegate implementation: virtual void OnProfilePrepared(Profile* profile) { profile_prepared_ = true; chromeos::LoginUtils::Get()->DoBrowserLaunch(profile, NULL); if (!pending_requests_) delete this; } scoped_refptr authenticator_; bool pending_requests_; bool profile_prepared_; }; void OptionallyRunChromeOSLoginManager(const CommandLine& parsed_command_line, Profile* profile) { // Login should always use dual display if there is an external display. chromeos::OutputConfigurator* output_configurator = ash::Shell::GetInstance()->output_configurator(); if (output_configurator->connected_output_count() > 1) output_configurator->SetDisplayMode(chromeos::STATE_DUAL_PRIMARY_ONLY); if (parsed_command_line.HasSwitch(switches::kLoginManager)) { std::string first_screen = parsed_command_line.GetSwitchValueASCII(switches::kLoginScreen); std::string size_arg = parsed_command_line.GetSwitchValueASCII( switches::kLoginScreenSize); gfx::Size size(0, 0); // Allow the size of the login window to be set explicitly. If not set, // default to the entire screen. This is mostly useful for testing. if (size_arg.size()) { std::vector dimensions; base::SplitString(size_arg, ',', &dimensions); if (dimensions.size() == 2) { int width, height; if (base::StringToInt(dimensions[0], &width) && base::StringToInt(dimensions[1], &height)) size.SetSize(width, height); } } chromeos::ShowLoginWizard(first_screen, size); if (chromeos::KioskModeSettings::Get()->IsKioskModeEnabled()) chromeos::InitializeKioskModeScreensaver(); } else if (parsed_command_line.HasSwitch(switches::kLoginUser) && parsed_command_line.HasSwitch(switches::kLoginPassword)) { chromeos::BootTimesLoader::Get()->RecordLoginAttempted(); new StubLogin( parsed_command_line.GetSwitchValueASCII(switches::kLoginUser), parsed_command_line.GetSwitchValueASCII(switches::kLoginPassword)); } else { if (!parsed_command_line.HasSwitch(switches::kTestName)) { // We did not log in (we crashed or are debugging), so we need to // restore Sync. chromeos::LoginUtils::Get()->RestoreAuthenticationSession(profile); } } } // ChromeBrowserMainPartsChromeos ---------------------------------------------- ChromeBrowserMainPartsChromeos::ChromeBrowserMainPartsChromeos( const content::MainFunctionParams& parameters) : ChromeBrowserMainPartsLinux(parameters) { } ChromeBrowserMainPartsChromeos::~ChromeBrowserMainPartsChromeos() { if (chromeos::KioskModeSettings::Get()->IsKioskModeEnabled()) chromeos::ShutdownKioskModeScreensaver(); cryptohome::AsyncMethodCaller::Shutdown(); chromeos::mtp::MediaTransferProtocolManager::Shutdown(); chromeos::disks::DiskMountManager::Shutdown(); // CrosLibrary is shut down before DBusThreadManager even though the former // is initialized before the latter becuase some of its libraries depend // on DBus clients. // TODO(hashimoto): Resolve this situation by removing CrosLibrary. // (crosbug.com/26160) if (!parameters().ui_task && chromeos::CrosLibrary::Get()) chromeos::CrosLibrary::Shutdown(); chromeos::input_method::InputMethodManager::Shutdown(); chromeos::CrosDBusService::Shutdown(); chromeos::DBusThreadManager::Shutdown(); // To be precise, logout (browser shutdown) is not yet done, but the // remaining work is negligible, hence we say LogoutDone here. chromeos::BootTimesLoader::Get()->AddLogoutTimeMarker("LogoutDone", false); chromeos::BootTimesLoader::Get()->WriteLogoutTimes(); } // content::BrowserMainParts and ChromeBrowserMainExtraParts overrides --------- void ChromeBrowserMainPartsChromeos::PreEarlyInitialization() { CommandLine* singleton_command_line = CommandLine::ForCurrentProcess(); if (parsed_command_line().HasSwitch(switches::kGuestSession)) { // Disable sync and extensions if we're in "browse without sign-in" mode. singleton_command_line->AppendSwitch(switches::kDisableSync); singleton_command_line->AppendSwitch(switches::kDisableExtensions); browser_defaults::bookmarks_enabled = false; } // If we're not running on real ChromeOS hardware (or under VM), and are not // showing the login manager or attempting a command line login, login with a // stub user. if (!base::chromeos::IsRunningOnChromeOS() && !parsed_command_line().HasSwitch(switches::kLoginManager) && !parsed_command_line().HasSwitch(switches::kLoginUser) && !parsed_command_line().HasSwitch(switches::kGuestSession)) { singleton_command_line->AppendSwitchASCII( switches::kLoginUser, chromeos::UserManager::kStubUser); if (!parsed_command_line().HasSwitch(switches::kLoginProfile)) { // This must be kept in sync with TestingProfile::kTestUserProfileDir. singleton_command_line->AppendSwitchASCII( switches::kLoginProfile, "test-user"); } LOG(INFO) << "Running as stub user with profile dir: " << singleton_command_line->GetSwitchValuePath( switches::kLoginProfile).value(); } ChromeBrowserMainPartsLinux::PreEarlyInitialization(); } void ChromeBrowserMainPartsChromeos::PreMainMessageLoopStart() { // Initialize CrosLibrary only for the browser, unless running tests // (which do their own CrosLibrary setup). if (!parameters().ui_task) { const bool use_stub = !base::chromeos::IsRunningOnChromeOS(); chromeos::CrosLibrary::Initialize(use_stub); } // Replace the default NetworkChangeNotifierFactory with ChromeOS specific // implementation. net::NetworkChangeNotifier::SetFactory( new chromeos::CrosNetworkChangeNotifierFactory()); ChromeBrowserMainPartsLinux::PreMainMessageLoopStart(); } void ChromeBrowserMainPartsChromeos::PostMainMessageLoopStart() { MessageLoopForUI* message_loop = MessageLoopForUI::current(); message_loop->AddObserver(g_message_loop_observer.Pointer()); // Initialize DBusThreadManager for the browser. This must be done after // the main message loop is started, as it uses the message loop. chromeos::DBusThreadManager::Initialize(); // Add observers for WallpaperManager. WallpaperManager is initialized before // DBusThreadManager. chromeos::WallpaperManager::Get()->AddObservers(); chromeos::CrosDBusService::Initialize(); // Initialize the device settings service so that we'll take actions per // signals sent from the session manager. chromeos::DeviceSettingsService::Get()->Initialize( chromeos::DBusThreadManager::Get()->GetSessionManagerClient(), chromeos::OwnerKeyUtil::Create()); chromeos::disks::DiskMountManager::Initialize(); chromeos::mtp::MediaTransferProtocolManager::Initialize(); cryptohome::AsyncMethodCaller::Initialize(); // Initialize the network change notifier for Chrome OS. The network // change notifier starts to monitor changes from the power manager and // the network manager. chromeos::CrosNetworkChangeNotifierFactory::GetInstance()->Init(); // Likewise, initialize the upgrade detector for Chrome OS. The upgrade // detector starts to monitor changes from the update engine. UpgradeDetectorChromeos::GetInstance()->Init(); // This function and SystemKeyEventListener use InputMethodManager. chromeos::input_method::InputMethodManager::Initialize(); if (base::chromeos::IsRunningOnChromeOS()) { // Disable Num Lock on X start up for http://crosbug.com/29169. chromeos::input_method::InputMethodManager::GetInstance()-> GetXKeyboard()->SetNumLockEnabled(false); } ChromeBrowserMainPartsLinux::PostMainMessageLoopStart(); } // Threads are initialized MainMessageLoopStart and MainMessageLoopRun. void ChromeBrowserMainPartsChromeos::PreMainMessageLoopRun() { chromeos::AudioHandler::Initialize(); chromeos::imageburner::BurnManager::Initialize(); // Listen for system key events so that the user will be able to adjust the // volume on the login screen, if Chrome is running on Chrome OS // (i.e. not Linux desktop), and in non-test mode. // Note: SystemKeyEventListener depends on the DBus thread. if (base::chromeos::IsRunningOnChromeOS() && !parameters().ui_task) { // ui_task is non-NULL when running tests. chromeos::SystemKeyEventListener::Initialize(); } ChromeBrowserMainPartsLinux::PreMainMessageLoopRun(); } void ChromeBrowserMainPartsChromeos::PreProfileInit() { // -- This used to be in ChromeBrowserMainParts::PreMainMessageLoopRun() // -- immediately before Profile creation(). // Now that the file thread exists we can record our stats. chromeos::BootTimesLoader::Get()->RecordChromeMainStats(); // Trigger prefetching of ownership status. chromeos::DeviceSettingsService::Get()->Load(); // -- This used to be in ChromeBrowserMainParts::PreMainMessageLoopRun() // -- just before CreateProfile(). // Initialize the screen locker now so that it can receive // LOGIN_USER_CHANGED notification from UserManager. if (chromeos::KioskModeSettings::Get()->IsKioskModeEnabled()) { chromeos::KioskModeIdleLogout::Initialize(); } else { chromeos::ScreenLocker::InitClass(); } // This forces the ProfileManager to be created and register for the // notification it needs to track the logged in user. g_browser_process->profile_manager(); // TODO(abarth): Should this move to InitializeNetworkOptions()? // Allow access to file:// on ChromeOS for tests. if (parsed_command_line().HasSwitch(switches::kAllowFileAccess)) ChromeNetworkDelegate::AllowAccessToAllFiles(); if (parsed_command_line().HasSwitch(switches::kEnableContacts)) { contact_manager_.reset(new contacts::ContactManager()); contact_manager_->Init(); } // There are two use cases for kLoginUser: // 1) if passed in tandem with kLoginPassword, to drive a "StubLogin" // 2) if passed alone, to signal that the indicated user has already // logged in and we should behave accordingly. // This handles case 2. if (parsed_command_line().HasSwitch(switches::kLoginUser) && !parsed_command_line().HasSwitch(switches::kLoginPassword)) { std::string username = parsed_command_line().GetSwitchValueASCII(switches::kLoginUser); VLOG(1) << "Relaunching browser for user: " << username; chromeos::UserManager::Get()->UserLoggedIn(username, true); // Redirects Chrome logging to the user data dir. logging::RedirectChromeLogging(parsed_command_line()); // Initialize user policy before creating the profile so the profile // initialization code sees policy settings. // Guest accounts are not subject to user policy. if (!chromeos::UserManager::Get()->IsLoggedInAsGuest()) { g_browser_process->browser_policy_connector()->InitializeUserPolicy( username, false /* wait_for_policy_fetch */); } chromeos::UserManager::Get()->SessionStarted(); } // In Aura builds this will initialize ash::Shell. ChromeBrowserMainPartsLinux::PreProfileInit(); } void ChromeBrowserMainPartsChromeos::PostProfileInit() { // -- This used to be in ChromeBrowserMainParts::PreMainMessageLoopRun() // -- just after CreateProfile(). policy::BrowserPolicyConnector* connector = g_browser_process->browser_policy_connector(); if (parsed_command_line().HasSwitch(switches::kLoginUser) && !parsed_command_line().HasSwitch(switches::kLoginPassword)) { // Pass the TokenService pointer to the policy connector so user policy can // grab a token and register with the policy server. // TODO(mnissler): Remove once OAuth is the only authentication mechanism. connector->SetUserPolicyTokenService( TokenServiceFactory::GetForProfile(profile())); // Make sure we flip every profile to not share proxies if the user hasn't // specified so explicitly. const PrefService::Preference* use_shared_proxies_pref = profile()->GetPrefs()->FindPreference(prefs::kUseSharedProxies); if (use_shared_proxies_pref->IsDefaultValue()) profile()->GetPrefs()->SetBoolean(prefs::kUseSharedProxies, false); } // Make sure the NetworkConfigurationUpdater is ready so that it pushes ONC // configuration before login. connector->GetNetworkConfigurationUpdater(); // Make sure that wallpaper boot transition and other delays in OOBE // are disabled for tests by default. // Individual tests may enable them if they want. if (parsed_command_line().HasSwitch(switches::kTestType)) chromeos::WizardController::SetZeroDelays(); // Tests should be able to tune login manager before showing it. // Thus only show login manager in normal (non-testing) mode. if (!parameters().ui_task) OptionallyRunChromeOSLoginManager(parsed_command_line(), profile()); // These observers must be initialized after the profile because // they use the profile to dispatch extension events. // // Initialize the brightness observer so that we'll display an onscreen // indication of brightness changes during login. brightness_observer_.reset(new chromeos::BrightnessObserver()); media_transfer_protocol_device_observer_.reset( new chromeos::mtp::MediaTransferProtocolDeviceObserverCros()); output_observer_.reset(new chromeos::OutputObserver()); resume_observer_.reset(new chromeos::ResumeObserver()); screen_lock_observer_.reset(new chromeos::ScreenLockObserver()); if (chromeos::KioskModeSettings::Get()->IsKioskModeEnabled()) power_state_override_.reset(new chromeos::PowerStateOverride()); removable_device_notifications_ = new chromeos::RemovableDeviceNotificationsCros(); ChromeBrowserMainPartsLinux::PostProfileInit(); } void ChromeBrowserMainPartsChromeos::PreBrowserStart() { // -- This used to be in ChromeBrowserMainParts::PreMainMessageLoopRun() // -- just before MetricsService::LogNeedForCleanShutdown(). g_browser_process->metrics_service()->StartExternalMetrics(); // Listen for XI_HierarchyChanged events. Note: if this is moved to // PreMainMessageLoopRun() then desktopui_PageCyclerTests fail for unknown // reasons, see http://crosbug.com/24833. chromeos::XInputHierarchyChangedEventListener::GetInstance(); // -- This used to be in ChromeBrowserMainParts::PreMainMessageLoopRun() // -- immediately after ChildProcess::WaitForDebugger(). // Start the out-of-memory priority manager here so that we give the most // amount of time for the other services to start up before we start // adjusting the oom priority. g_browser_process->oom_priority_manager()->Start(); ChromeBrowserMainPartsLinux::PreBrowserStart(); } void ChromeBrowserMainPartsChromeos::PostBrowserStart() { // FILE thread is created in ChromeBrowserMainParts::PreMainMessageLoopRun(). // Get the statistics provider instance here to start loading statistcs // on the background FILE thread. chromeos::system::StatisticsProvider::GetInstance(); // These are dependent on the ash::Shell singleton already having been // initialized. power_button_observer_.reset(new chromeos::PowerButtonObserver); user_activity_notifier_.reset(new chromeos::UserActivityNotifier); video_activity_notifier_.reset(new chromeos::VideoActivityNotifier); screen_dimming_observer_.reset(new chromeos::ScreenDimmingObserver); ChromeBrowserMainPartsLinux::PostBrowserStart(); } // Shut down services before the browser process, etc are destroyed. void ChromeBrowserMainPartsChromeos::PostMainMessageLoopRun() { chromeos::BootTimesLoader::Get()->AddLogoutTimeMarker("UIMessageLoopEnded", true); g_browser_process->oom_priority_manager()->Stop(); // Stops LoginUtils background fetchers. This is needed because IO thread is // going to stop soon after this function. The pending background jobs could // cause it to crash during shutdown. chromeos::LoginUtils::Get()->StopBackgroundFetchers(); // Shutdown the upgrade detector for Chrome OS. The upgrade detector // stops monitoring changes from the update engine. if (UpgradeDetectorChromeos::GetInstance()) UpgradeDetectorChromeos::GetInstance()->Shutdown(); // Shutdown the network change notifier for Chrome OS. The network // change notifier stops monitoring changes from the power manager and // the network manager. if (chromeos::CrosNetworkChangeNotifierFactory::GetInstance()) chromeos::CrosNetworkChangeNotifierFactory::GetInstance()->Shutdown(); // Tell DeviceSettingsService to stop talking to session_manager. chromeos::DeviceSettingsService::Get()->Shutdown(); // We should remove observers attached to D-Bus clients before // DBusThreadManager is shut down. screen_lock_observer_.reset(); resume_observer_.reset(); brightness_observer_.reset(); media_transfer_protocol_device_observer_.reset(); output_observer_.reset(); // The XInput2 event listener needs to be shut down earlier than when // Singletons are finally destroyed in AtExitManager. chromeos::XInputHierarchyChangedEventListener::GetInstance()->Stop(); // chromeos::SystemKeyEventListener::Shutdown() is always safe to call, // even if Initialize() wasn't called. chromeos::SystemKeyEventListener::Shutdown(); chromeos::imageburner::BurnManager::Shutdown(); chromeos::AudioHandler::Shutdown(); chromeos::WebSocketProxyController::Shutdown(); // Let classes unregister themselves as observers of the ash::Shell singleton // before the shell is destroyed. user_activity_notifier_.reset(); video_activity_notifier_.reset(); // Detach D-Bus clients before DBusThreadManager is shut down. power_button_observer_.reset(); screen_dimming_observer_.reset(); // Delete ContactManager while |g_browser_process| is still alive. contact_manager_.reset(); ChromeBrowserMainPartsLinux::PostMainMessageLoopRun(); } void ChromeBrowserMainPartsChromeos::SetupPlatformFieldTrials() { SetupLowMemoryHeadroomFieldTrial(); } void ChromeBrowserMainPartsChromeos::SetupLowMemoryHeadroomFieldTrial() { chrome::VersionInfo::Channel channel = chrome::VersionInfo::GetChannel(); // Only enable this experiment on Canary and Dev, since it's possible // that this will make the machine unstable. // Note that to have this code execute in a developer build, // then chrome::VersionInfo::CHANNEL_UNKNOWN needs to be added here. if (channel == chrome::VersionInfo::CHANNEL_CANARY || channel == chrome::VersionInfo::CHANNEL_DEV) { const base::FieldTrial::Probability kDivisor = 7; // 1 in 7 probability of being in each group. If the default value for the // kernel matches one of the experiment groups, then they will have // identical results. const base::FieldTrial::Probability kEnableProbability = 1; scoped_refptr trial = base::FieldTrialList::FactoryGetFieldTrial( "LowMemoryMargin", kDivisor, "default", 2012, 7, 30, NULL); int disable = trial->AppendGroup("off", kEnableProbability); int margin_0mb = trial->AppendGroup("0mb", kEnableProbability); int margin_25mb = trial->AppendGroup("25mb", kEnableProbability); int margin_50mb = trial->AppendGroup("50mb", kEnableProbability); int margin_100mb = trial->AppendGroup("100mb", kEnableProbability); int margin_200mb = trial->AppendGroup("200mb", kEnableProbability); if (trial->group() == disable) { LOG(WARNING) << "low_mem: Part of 'off' experiment"; chromeos::LowMemoryObserver::SetLowMemoryMargin(-1); } else if (trial->group() == margin_0mb) { LOG(WARNING) << "low_mem: Part of '0MB' experiment"; chromeos::LowMemoryObserver::SetLowMemoryMargin(0); } else if (trial->group() == margin_25mb) { LOG(WARNING) << "low_mem: Part of '25MB' experiment"; chromeos::LowMemoryObserver::SetLowMemoryMargin(25); } else if (trial->group() == margin_50mb) { LOG(WARNING) << "low_mem: Part of '50MB' experiment"; chromeos::LowMemoryObserver::SetLowMemoryMargin(50); } else if (trial->group() == margin_100mb) { LOG(WARNING) << "low_mem: Part of '100MB' experiment"; chromeos::LowMemoryObserver::SetLowMemoryMargin(100); } else if (trial->group() == margin_200mb) { LOG(WARNING) << "low_mem: Part of '200MB' experiment"; chromeos::LowMemoryObserver::SetLowMemoryMargin(200); } else { LOG(WARNING) << "low_mem: Part of 'default' experiment"; } } }