chrome/browser/io_thread.cc

   1 // Copyright (c) 2012 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/io_thread.h"
   6
   7 #include <vector>
   8
   9 #include "base/base64.h"
  10 #include "base/bind.h"
  11 #include "base/bind_helpers.h"
  12 #include "base/command_line.h"
  13 #include "base/compiler_specific.h"
  14 #include "base/debug/leak_tracker.h"
  15 #include "base/logging.h"
  16 #include "base/metrics/field_trial.h"
  17 #include "base/prefs/pref_registry_simple.h"
  18 #include "base/prefs/pref_service.h"
  19 #include "base/profiler/scoped_tracker.h"
  20 #include "base/stl_util.h"
  21 #include "base/strings/string_number_conversions.h"
  22 #include "base/strings/string_piece.h"
  23 #include "base/strings/string_split.h"
  24 #include "base/strings/string_util.h"
  25 #include "base/threading/sequenced_worker_pool.h"
  26 #include "base/threading/thread.h"
  27 #include "base/threading/worker_pool.h"
  28 #include "base/time/time.h"
  29 #include "base/trace_event/trace_event.h"
  30 #include "build/build_config.h"
  31 #include "chrome/browser/browser_process.h"
  32 #include "chrome/browser/net/async_dns_field_trial.h"
  33 #include "chrome/browser/net/chrome_net_log.h"
  34 #include "chrome/browser/net/chrome_network_delegate.h"
  35 #include "chrome/browser/net/connect_interceptor.h"
  36 #include "chrome/browser/net/dns_probe_service.h"
  37 #include "chrome/browser/net/pref_proxy_config_tracker.h"
  38 #include "chrome/browser/net/proxy_service_factory.h"
  39 #include "chrome/common/chrome_content_client.h"
  40 #include "chrome/common/chrome_switches.h"
  41 #include "chrome/common/chrome_version_info.h"
  42 #include "chrome/common/pref_names.h"
  43 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_prefs.h"
  44 #include "components/data_reduction_proxy/core/common/data_reduction_proxy_params.h"
  45 #include "components/policy/core/common/policy_service.h"
  46 #include "components/variations/variations_associated_data.h"
  47 #include "content/public/browser/browser_thread.h"
  48 #include "content/public/browser/cookie_store_factory.h"
  49 #include "content/public/common/user_agent.h"
  50 #include "net/base/host_mapping_rules.h"
  51 #include "net/base/net_util.h"
  52 #include "net/base/network_quality_estimator.h"
  53 #include "net/base/sdch_manager.h"
  54 #include "net/cert/cert_policy_enforcer.h"
  55 #include "net/cert/cert_verifier.h"
  56 #include "net/cert/cert_verify_proc.h"
  57 #include "net/cert/ct_known_logs.h"
  58 #include "net/cert/ct_known_logs_static.h"
  59 #include "net/cert/ct_log_verifier.h"
  60 #include "net/cert/ct_verifier.h"
  61 #include "net/cert/multi_log_ct_verifier.h"
  62 #include "net/cert/multi_threaded_cert_verifier.h"
  63 #include "net/cookies/cookie_store.h"
  64 #include "net/dns/host_cache.h"
  65 #include "net/dns/host_resolver.h"
  66 #include "net/dns/mapped_host_resolver.h"
  67 #include "net/ftp/ftp_network_layer.h"
  68 #include "net/http/http_auth_filter.h"
  69 #include "net/http/http_auth_handler_factory.h"
  70 #include "net/http/http_network_layer.h"
  71 #include "net/http/http_server_properties_impl.h"
  72 #include "net/proxy/proxy_config_service.h"
  73 #include "net/proxy/proxy_script_fetcher_impl.h"
  74 #include "net/proxy/proxy_service.h"
  75 #include "net/quic/crypto/crypto_protocol.h"
  76 #include "net/quic/quic_protocol.h"
  77 #include "net/quic/quic_utils.h"
  78 #include "net/socket/tcp_client_socket.h"
  79 #include "net/spdy/spdy_session.h"
  80 #include "net/ssl/channel_id_service.h"
  81 #include "net/ssl/default_channel_id_store.h"
  82 #include "net/url_request/data_protocol_handler.h"
  83 #include "net/url_request/file_protocol_handler.h"
  84 #include "net/url_request/ftp_protocol_handler.h"
  85 #include "net/url_request/static_http_user_agent_settings.h"
  86 #include "net/url_request/url_fetcher.h"
  87 #include "net/url_request/url_request_context.h"
  88 #include "net/url_request/url_request_context_getter.h"
  89 #include "net/url_request/url_request_job_factory_impl.h"
  90 #include "url/url_constants.h"
  91
  92 #if defined(ENABLE_CONFIGURATION_POLICY)
  93 #include "policy/policy_constants.h"
  94 #endif
  95
  96 #if defined(ENABLE_EXTENSIONS)
  97 #include "chrome/browser/extensions/event_router_forwarder.h"
  98 #endif
  99
 100 #if defined(USE_NSS_CERTS) || defined(OS_IOS)
 101 #include "net/cert_net/nss_ocsp.h"
 102 #endif
 103
 104 #if defined(OS_ANDROID)
 105 #include "base/android/build_info.h"
 106 #endif
 107
 108 #if defined(OS_CHROMEOS)
 109 #include "chrome/browser/chromeos/net/cert_verify_proc_chromeos.h"
 110 #include "chromeos/network/host_resolver_impl_chromeos.h"
 111 #endif
 112
 113 using content::BrowserThread;
 114
 115 class SafeBrowsingURLRequestContext;
 116
 117 // The IOThread object must outlive any tasks posted to the IO thread before the
 118 // Quit task, so base::Bind() calls are not refcounted.
 119
 120 namespace {
 121
 122 const char kTCPFastOpenFieldTrialName[] = "TCPFastOpen";
 123 const char kTCPFastOpenHttpsEnabledGroupName[] = "HttpsEnabled";
 124
 125 const char kQuicFieldTrialName[] = "QUIC";
 126 const char kQuicFieldTrialEnabledGroupName[] = "Enabled";
 127 const char kQuicFieldTrialHttpsEnabledGroupName[] = "HttpsEnabled";
 128
 129 // The SPDY trial composes two different trial plus control groups:
 130 //  * A "holdback" group with SPDY disabled, and corresponding control
 131 //  (SPDY/3.1). The primary purpose of the holdback group is to encourage site
 132 //  operators to do feature detection rather than UA-sniffing. As such, this
 133 //  trial runs continuously.
 134 //  * A SPDY/4 experiment, for SPDY/4 (aka HTTP/2) vs SPDY/3.1 comparisons and
 135 //  eventual SPDY/4 deployment.
 136 const char kSpdyFieldTrialName[] = "SPDY";
 137 const char kSpdyFieldTrialHoldbackGroupNamePrefix[] = "SpdyDisabled";
 138 const char kSpdyFieldTrialSpdy31GroupNamePrefix[] = "Spdy31Enabled";
 139 const char kSpdyFieldTrialSpdy4GroupNamePrefix[] = "Spdy4Enabled";
 140 const char kSpdyFieldTrialParametrizedPrefix[] = "Parametrized";
 141
 142 // Field trial for network quality estimator. Seeds RTT and downstream
 143 // throughput observations with values that correspond to the connection type
 144 // determined by the operating system.
 145 const char kNetworkQualityEstimatorFieldTrialName[] = "NetworkQualityEstimator";
 146
 147 #if defined(OS_MACOSX) && !defined(OS_IOS)
 148 void ObserveKeychainEvents() {
 149   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 150   net::CertDatabase::GetInstance()->SetMessageLoopForKeychainEvents();
 151 }
 152 #endif
 153
 154 // Used for the "system" URLRequestContext.
 155 class SystemURLRequestContext : public net::URLRequestContext {
 156  public:
 157   SystemURLRequestContext() {
 158 #if defined(USE_NSS_CERTS) || defined(OS_IOS)
 159     net::SetURLRequestContextForNSSHttpIO(this);
 160 #endif
 161   }
 162
 163  private:
 164   ~SystemURLRequestContext() override {
 165     AssertNoURLRequests();
 166 #if defined(USE_NSS_CERTS) || defined(OS_IOS)
 167     net::SetURLRequestContextForNSSHttpIO(NULL);
 168 #endif
 169   }
 170 };
 171
 172 scoped_ptr<net::HostResolver> CreateGlobalHostResolver(net::NetLog* net_log) {
 173   TRACE_EVENT0("startup", "IOThread::CreateGlobalHostResolver");
 174   const base::CommandLine& command_line =
 175       *base::CommandLine::ForCurrentProcess();
 176
 177   net::HostResolver::Options options;
 178
 179   // Use the retry attempts override from the command-line, if any.
 180   if (command_line.HasSwitch(switches::kHostResolverRetryAttempts)) {
 181     std::string s =
 182         command_line.GetSwitchValueASCII(switches::kHostResolverRetryAttempts);
 183     // Parse the switch (it should be a non-negative integer).
 184     int n;
 185     if (base::StringToInt(s, &n) && n >= 0) {
 186       options.max_retry_attempts = static_cast<size_t>(n);
 187     } else {
 188       LOG(ERROR) << "Invalid switch for host resolver retry attempts: " << s;
 189     }
 190   }
 191
 192   scoped_ptr<net::HostResolver> global_host_resolver;
 193 #if defined OS_CHROMEOS
 194   global_host_resolver =
 195       chromeos::HostResolverImplChromeOS::CreateSystemResolver(options,
 196                                                                net_log);
 197 #else
 198   global_host_resolver =
 199       net::HostResolver::CreateSystemResolver(options, net_log);
 200 #endif
 201
 202   // If hostname remappings were specified on the command-line, layer these
 203   // rules on top of the real host resolver. This allows forwarding all requests
 204   // through a designated test server.
 205   if (!command_line.HasSwitch(switches::kHostResolverRules))
 206     return global_host_resolver.Pass();
 207
 208   scoped_ptr<net::MappedHostResolver> remapped_resolver(
 209       new net::MappedHostResolver(global_host_resolver.Pass()));
 210   remapped_resolver->SetRulesFromString(
 211       command_line.GetSwitchValueASCII(switches::kHostResolverRules));
 212   return remapped_resolver.Pass();
 213 }
 214
 215 // TODO(willchan): Remove proxy script fetcher context since it's not necessary
 216 // now that I got rid of refcounting URLRequestContexts.
 217 // See IOThread::Globals for details.
 218 net::URLRequestContext*
 219 ConstructProxyScriptFetcherContext(IOThread::Globals* globals,
 220                                    net::NetLog* net_log) {
 221   net::URLRequestContext* context = new net::URLRequestContext;
 222   context->set_net_log(net_log);
 223   context->set_host_resolver(globals->host_resolver.get());
 224   context->set_cert_verifier(globals->cert_verifier.get());
 225   context->set_transport_security_state(
 226       globals->transport_security_state.get());
 227   context->set_cert_transparency_verifier(
 228       globals->cert_transparency_verifier.get());
 229   context->set_http_auth_handler_factory(
 230       globals->http_auth_handler_factory.get());
 231   context->set_proxy_service(globals->proxy_script_fetcher_proxy_service.get());
 232   context->set_http_transaction_factory(
 233       globals->proxy_script_fetcher_http_transaction_factory.get());
 234   context->set_job_factory(
 235       globals->proxy_script_fetcher_url_request_job_factory.get());
 236   context->set_cookie_store(globals->system_cookie_store.get());
 237   context->set_channel_id_service(
 238       globals->system_channel_id_service.get());
 239   context->set_network_delegate(globals->system_network_delegate.get());
 240   context->set_http_user_agent_settings(
 241       globals->http_user_agent_settings.get());
 242   // TODO(rtenneti): We should probably use HttpServerPropertiesManager for the
 243   // system URLRequestContext too. There's no reason this should be tied to a
 244   // profile.
 245   return context;
 246 }
 247
 248 net::URLRequestContext*
 249 ConstructSystemRequestContext(IOThread::Globals* globals,
 250                               net::NetLog* net_log) {
 251   net::URLRequestContext* context = new SystemURLRequestContext;
 252   context->set_net_log(net_log);
 253   context->set_host_resolver(globals->host_resolver.get());
 254   context->set_cert_verifier(globals->cert_verifier.get());
 255   context->set_transport_security_state(
 256       globals->transport_security_state.get());
 257   context->set_cert_transparency_verifier(
 258       globals->cert_transparency_verifier.get());
 259   context->set_http_auth_handler_factory(
 260       globals->http_auth_handler_factory.get());
 261   context->set_proxy_service(globals->system_proxy_service.get());
 262   context->set_http_transaction_factory(
 263       globals->system_http_transaction_factory.get());
 264   context->set_job_factory(globals->system_url_request_job_factory.get());
 265   context->set_cookie_store(globals->system_cookie_store.get());
 266   context->set_channel_id_service(
 267       globals->system_channel_id_service.get());
 268   context->set_network_delegate(globals->system_network_delegate.get());
 269   context->set_http_user_agent_settings(
 270       globals->http_user_agent_settings.get());
 271   context->set_network_quality_estimator(
 272       globals->network_quality_estimator.get());
 273   return context;
 274 }
 275
 276 int GetSwitchValueAsInt(const base::CommandLine& command_line,
 277                         const std::string& switch_name) {
 278   int value;
 279   if (!base::StringToInt(command_line.GetSwitchValueASCII(switch_name),
 280                          &value)) {
 281     return 0;
 282   }
 283   return value;
 284 }
 285
 286 // Returns the value associated with |key| in |params| or "" if the
 287 // key is not present in the map.
 288 const std::string& GetVariationParam(
 289     const std::map<std::string, std::string>& params,
 290     const std::string& key) {
 291   std::map<std::string, std::string>::const_iterator it = params.find(key);
 292   if (it == params.end())
 293     return base::EmptyString();
 294
 295   return it->second;
 296 }
 297
 298 // Parse kUseSpdy command line flag options, which may contain the following:
 299 //
 300 //   "off"                      : Disables SPDY support entirely.
 301 //   "no-ping"                  : Disables SPDY ping connection testing.
 302 //   "exclude=<host>"           : Disables SPDY support for the host <host>.
 303 //   "no-compress"              : Disables SPDY header compression.
 304 //   "no-alt-protocols          : Disables alternate protocol support.
 305 //   "init-max-streams=<limit>" : Specifies the maximum number of concurrent
 306 //                                streams for a SPDY session, unless the
 307 //                                specifies a different value via SETTINGS.
 308 void ConfigureSpdyGlobalsFromUseSpdyArgument(const std::string& mode,
 309                                              IOThread::Globals* globals) {
 310   static const char kOff[] = "off";
 311   static const char kDisablePing[] = "no-ping";
 312   static const char kExclude[] = "exclude";  // Hosts to exclude
 313   static const char kDisableCompression[] = "no-compress";
 314   static const char kDisableAltProtocols[] = "no-alt-protocols";
 315   static const char kInitialMaxConcurrentStreams[] = "init-max-streams";
 316
 317   for (const base::StringPiece& element : base::SplitStringPiece(
 318            mode, ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL)) {
 319     std::vector<base::StringPiece> name_value = base::SplitStringPiece(
 320         element, "=", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
 321     const base::StringPiece option =
 322         name_value.size() > 0 ? name_value[0] : base::StringPiece();
 323     const base::StringPiece value =
 324         name_value.size() > 1 ? name_value[1] : base::StringPiece();
 325
 326     if (option == kOff) {
 327       net::HttpStreamFactory::set_spdy_enabled(false);
 328       continue;
 329     }
 330     if (option == kDisablePing) {
 331       globals->enable_spdy_ping_based_connection_checking.set(false);
 332       continue;
 333     }
 334     if (option == kExclude) {
 335       globals->forced_spdy_exclusions.insert(
 336           net::HostPortPair::FromURL(GURL(value.as_string())));
 337       continue;
 338     }
 339     if (option == kDisableCompression) {
 340       globals->enable_spdy_compression.set(false);
 341       continue;
 342     }
 343     if (option == kDisableAltProtocols) {
 344       globals->use_alternate_protocols.set(false);
 345       continue;
 346     }
 347     if (option == kInitialMaxConcurrentStreams) {
 348       int streams;
 349       if (base::StringToInt(value, &streams)) {
 350         globals->initial_max_spdy_concurrent_streams.set(streams);
 351         continue;
 352       }
 353     }
 354     LOG(DFATAL) << "Unrecognized spdy option: " << option.as_string();
 355   }
 356 }
 357
 358 }  // namespace
 359
 360 class IOThread::LoggingNetworkChangeObserver
 361     : public net::NetworkChangeNotifier::IPAddressObserver,
 362       public net::NetworkChangeNotifier::ConnectionTypeObserver,
 363       public net::NetworkChangeNotifier::NetworkChangeObserver {
 364  public:
 365   // |net_log| must remain valid throughout our lifetime.
 366   explicit LoggingNetworkChangeObserver(net::NetLog* net_log)
 367       : net_log_(net_log) {
 368     net::NetworkChangeNotifier::AddIPAddressObserver(this);
 369     net::NetworkChangeNotifier::AddConnectionTypeObserver(this);
 370     net::NetworkChangeNotifier::AddNetworkChangeObserver(this);
 371   }
 372
 373   ~LoggingNetworkChangeObserver() override {
 374     net::NetworkChangeNotifier::RemoveIPAddressObserver(this);
 375     net::NetworkChangeNotifier::RemoveConnectionTypeObserver(this);
 376     net::NetworkChangeNotifier::RemoveNetworkChangeObserver(this);
 377   }
 378
 379   // NetworkChangeNotifier::IPAddressObserver implementation.
 380   void OnIPAddressChanged() override {
 381     VLOG(1) << "Observed a change to the network IP addresses";
 382
 383     net_log_->AddGlobalEntry(net::NetLog::TYPE_NETWORK_IP_ADDRESSES_CHANGED);
 384   }
 385
 386   // NetworkChangeNotifier::ConnectionTypeObserver implementation.
 387   void OnConnectionTypeChanged(
 388       net::NetworkChangeNotifier::ConnectionType type) override {
 389     std::string type_as_string =
 390         net::NetworkChangeNotifier::ConnectionTypeToString(type);
 391
 392     VLOG(1) << "Observed a change to network connectivity state "
 393             << type_as_string;
 394
 395     net_log_->AddGlobalEntry(
 396         net::NetLog::TYPE_NETWORK_CONNECTIVITY_CHANGED,
 397         net::NetLog::StringCallback("new_connection_type", &type_as_string));
 398   }
 399
 400   // NetworkChangeNotifier::NetworkChangeObserver implementation.
 401   void OnNetworkChanged(
 402       net::NetworkChangeNotifier::ConnectionType type) override {
 403     std::string type_as_string =
 404         net::NetworkChangeNotifier::ConnectionTypeToString(type);
 405
 406     VLOG(1) << "Observed a network change to state " << type_as_string;
 407
 408     net_log_->AddGlobalEntry(
 409         net::NetLog::TYPE_NETWORK_CHANGED,
 410         net::NetLog::StringCallback("new_connection_type", &type_as_string));
 411   }
 412
 413  private:
 414   net::NetLog* net_log_;
 415   DISALLOW_COPY_AND_ASSIGN(LoggingNetworkChangeObserver);
 416 };
 417
 418 class SystemURLRequestContextGetter : public net::URLRequestContextGetter {
 419  public:
 420   explicit SystemURLRequestContextGetter(IOThread* io_thread);
 421
 422   // Implementation for net::UrlRequestContextGetter.
 423   net::URLRequestContext* GetURLRequestContext() override;
 424   scoped_refptr<base::SingleThreadTaskRunner> GetNetworkTaskRunner()
 425       const override;
 426
 427  protected:
 428   ~SystemURLRequestContextGetter() override;
 429
 430  private:
 431   IOThread* const io_thread_;  // Weak pointer, owned by BrowserProcess.
 432   scoped_refptr<base::SingleThreadTaskRunner> network_task_runner_;
 433
 434   base::debug::LeakTracker<SystemURLRequestContextGetter> leak_tracker_;
 435 };
 436
 437 SystemURLRequestContextGetter::SystemURLRequestContextGetter(
 438     IOThread* io_thread)
 439     : io_thread_(io_thread),
 440       network_task_runner_(
 441           BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO)) {
 442 }
 443
 444 SystemURLRequestContextGetter::~SystemURLRequestContextGetter() {}
 445
 446 net::URLRequestContext* SystemURLRequestContextGetter::GetURLRequestContext() {
 447   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 448   DCHECK(io_thread_->globals()->system_request_context.get());
 449
 450   return io_thread_->globals()->system_request_context.get();
 451 }
 452
 453 scoped_refptr<base::SingleThreadTaskRunner>
 454 SystemURLRequestContextGetter::GetNetworkTaskRunner() const {
 455   return network_task_runner_;
 456 }
 457
 458 IOThread::Globals::
 459 SystemRequestContextLeakChecker::SystemRequestContextLeakChecker(
 460     Globals* globals)
 461     : globals_(globals) {
 462   DCHECK(globals_);
 463 }
 464
 465 IOThread::Globals::
 466 SystemRequestContextLeakChecker::~SystemRequestContextLeakChecker() {
 467   if (globals_->system_request_context.get())
 468     globals_->system_request_context->AssertNoURLRequests();
 469 }
 470
 471 IOThread::Globals::Globals()
 472     : system_request_context_leak_checker(this),
 473       ignore_certificate_errors(false),
 474       testing_fixed_http_port(0),
 475       testing_fixed_https_port(0),
 476       enable_user_alternate_protocol_ports(false) {
 477 }
 478
 479 IOThread::Globals::~Globals() {}
 480
 481 // |local_state| is passed in explicitly in order to (1) reduce implicit
 482 // dependencies and (2) make IOThread more flexible for testing.
 483 IOThread::IOThread(
 484     PrefService* local_state,
 485     policy::PolicyService* policy_service,
 486     ChromeNetLog* net_log,
 487     extensions::EventRouterForwarder* extension_event_router_forwarder)
 488     : net_log_(net_log),
 489 #if defined(ENABLE_EXTENSIONS)
 490       extension_event_router_forwarder_(extension_event_router_forwarder),
 491 #endif
 492       globals_(NULL),
 493       is_spdy_disabled_by_policy_(false),
 494       is_quic_allowed_by_policy_(true),
 495       creation_time_(base::TimeTicks::Now()),
 496       weak_factory_(this) {
 497   auth_schemes_ = local_state->GetString(prefs::kAuthSchemes);
 498   negotiate_disable_cname_lookup_ = local_state->GetBoolean(
 499       prefs::kDisableAuthNegotiateCnameLookup);
 500   negotiate_enable_port_ = local_state->GetBoolean(
 501       prefs::kEnableAuthNegotiatePort);
 502   auth_server_whitelist_ = local_state->GetString(prefs::kAuthServerWhitelist);
 503   auth_delegate_whitelist_ = local_state->GetString(
 504       prefs::kAuthNegotiateDelegateWhitelist);
 505   gssapi_library_name_ = local_state->GetString(prefs::kGSSAPILibraryName);
 506   auth_android_negotiate_account_type_ =
 507       local_state->GetString(prefs::kAuthAndroidNegotiateAccountType);
 508   pref_proxy_config_tracker_.reset(
 509       ProxyServiceFactory::CreatePrefProxyConfigTrackerOfLocalState(
 510           local_state));
 511   ChromeNetworkDelegate::InitializePrefsOnUIThread(
 512       &system_enable_referrers_,
 513       NULL,
 514       NULL,
 515       NULL,
 516       local_state);
 517   ssl_config_service_manager_.reset(
 518       SSLConfigServiceManager::CreateDefaultManager(local_state));
 519
 520   base::Value* dns_client_enabled_default = new base::FundamentalValue(
 521       chrome_browser_net::ConfigureAsyncDnsFieldTrial());
 522   local_state->SetDefaultPrefValue(prefs::kBuiltInDnsClientEnabled,
 523                                    dns_client_enabled_default);
 524   chrome_browser_net::LogAsyncDnsPrefSource(
 525       local_state->FindPreference(prefs::kBuiltInDnsClientEnabled));
 526
 527   dns_client_enabled_.Init(prefs::kBuiltInDnsClientEnabled,
 528                            local_state,
 529                            base::Bind(&IOThread::UpdateDnsClientEnabled,
 530                                       base::Unretained(this)));
 531   dns_client_enabled_.MoveToThread(
 532       BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO));
 533
 534   quick_check_enabled_.Init(prefs::kQuickCheckEnabled,
 535                             local_state);
 536   quick_check_enabled_.MoveToThread(
 537       BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO));
 538
 539 #if defined(ENABLE_CONFIGURATION_POLICY)
 540   is_spdy_disabled_by_policy_ = policy_service->GetPolicies(
 541       policy::PolicyNamespace(policy::POLICY_DOMAIN_CHROME, std::string())).Get(
 542           policy::key::kDisableSpdy) != NULL;
 543
 544   const base::Value* value = policy_service->GetPolicies(
 545       policy::PolicyNamespace(policy::POLICY_DOMAIN_CHROME,
 546       std::string())).GetValue(policy::key::kQuicAllowed);
 547   if (value)
 548     value->GetAsBoolean(&is_quic_allowed_by_policy_);
 549 #endif  // ENABLE_CONFIGURATION_POLICY
 550
 551   BrowserThread::SetDelegate(BrowserThread::IO, this);
 552 }
 553
 554 IOThread::~IOThread() {
 555   // This isn't needed for production code, but in tests, IOThread may
 556   // be multiply constructed.
 557   BrowserThread::SetDelegate(BrowserThread::IO, NULL);
 558
 559   pref_proxy_config_tracker_->DetachFromPrefService();
 560   DCHECK(!globals_);
 561 }
 562
 563 IOThread::Globals* IOThread::globals() {
 564   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 565   return globals_;
 566 }
 567
 568 void IOThread::SetGlobalsForTesting(Globals* globals) {
 569   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 570   DCHECK(!globals || !globals_);
 571   globals_ = globals;
 572 }
 573
 574 ChromeNetLog* IOThread::net_log() {
 575   return net_log_;
 576 }
 577
 578 void IOThread::ChangedToOnTheRecord() {
 579   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 580   BrowserThread::PostTask(
 581       BrowserThread::IO,
 582       FROM_HERE,
 583       base::Bind(&IOThread::ChangedToOnTheRecordOnIOThread,
 584                  base::Unretained(this)));
 585 }
 586
 587 net::URLRequestContextGetter* IOThread::system_url_request_context_getter() {
 588   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 589   if (!system_url_request_context_getter_.get()) {
 590     InitSystemRequestContext();
 591   }
 592   return system_url_request_context_getter_.get();
 593 }
 594
 595 void IOThread::Init() {
 596   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 597   // is fixed.
 598   tracked_objects::ScopedTracker tracking_profile1(
 599       FROM_HERE_WITH_EXPLICIT_FUNCTION("466432 IOThread::InitAsync::Start"));
 600   TRACE_EVENT0("startup", "IOThread::InitAsync");
 601   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 602
 603 #if defined(USE_NSS_CERTS) || defined(OS_IOS)
 604   net::SetMessageLoopForNSSHttpIO();
 605 #endif
 606
 607   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 608   // is fixed.
 609   tracked_objects::ScopedTracker tracking_profile2(
 610       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 611           "466432 IOThread::InitAsync::CommandLineForCurrentProcess"));
 612   const base::CommandLine& command_line =
 613       *base::CommandLine::ForCurrentProcess();
 614
 615   DCHECK(!globals_);
 616   globals_ = new Globals;
 617
 618   // Add an observer that will emit network change events to the ChromeNetLog.
 619   // Assuming NetworkChangeNotifier dispatches in FIFO order, we should be
 620   // logging the network change before other IO thread consumers respond to it.
 621   network_change_observer_.reset(
 622       new LoggingNetworkChangeObserver(net_log_));
 623
 624   // Setup the HistogramWatcher to run on the IO thread.
 625   net::NetworkChangeNotifier::InitHistogramWatcher();
 626
 627 #if defined(ENABLE_EXTENSIONS)
 628   globals_->extension_event_router_forwarder =
 629       extension_event_router_forwarder_;
 630 #endif
 631
 632   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 633   // is fixed.
 634   tracked_objects::ScopedTracker tracking_profile3(
 635       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 636           "466432 IOThread::InitAsync::ChromeNetworkDelegate"));
 637   scoped_ptr<ChromeNetworkDelegate> chrome_network_delegate(
 638       new ChromeNetworkDelegate(extension_event_router_forwarder(),
 639                                 &system_enable_referrers_));
 640
 641   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 642   // is fixed.
 643   tracked_objects::ScopedTracker tracking_profile4(
 644       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 645           "466432 IOThread::InitAsync::CreateGlobalHostResolver"));
 646   globals_->system_network_delegate = chrome_network_delegate.Pass();
 647   globals_->host_resolver = CreateGlobalHostResolver(net_log_);
 648
 649   std::map<std::string, std::string> network_quality_estimator_params;
 650   variations::GetVariationParams(kNetworkQualityEstimatorFieldTrialName,
 651                                  &network_quality_estimator_params);
 652   globals_->network_quality_estimator.reset(
 653       new net::NetworkQualityEstimator(network_quality_estimator_params));
 654
 655   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 656   // is fixed.
 657   tracked_objects::ScopedTracker tracking_profile5(
 658       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 659           "466432 IOThread::InitAsync::UpdateDnsClientEnabled::Start"));
 660   UpdateDnsClientEnabled();
 661   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 662   // is fixed.
 663   tracked_objects::ScopedTracker tracking_profile6(
 664       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 665           "466432 IOThread::InitAsync::UpdateDnsClientEnabled::End"));
 666 #if defined(OS_CHROMEOS)
 667   // Creates a CertVerifyProc that doesn't allow any profile-provided certs.
 668   globals_->cert_verifier.reset(new net::MultiThreadedCertVerifier(
 669       new chromeos::CertVerifyProcChromeOS()));
 670 #else
 671   globals_->cert_verifier.reset(new net::MultiThreadedCertVerifier(
 672       net::CertVerifyProc::CreateDefault()));
 673 #endif
 674
 675   globals_->transport_security_state.reset(new net::TransportSecurityState());
 676
 677   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 678   // is fixed.
 679   tracked_objects::ScopedTracker tracking_profile8(
 680       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 681           "466432 IOThread::InitAsync::CreateLogVerifiers::Start"));
 682   std::vector<scoped_refptr<net::CTLogVerifier>> ct_logs(
 683       net::ct::CreateLogVerifiersForKnownLogs());
 684
 685   // Add logs from command line
 686   if (command_line.HasSwitch(switches::kCertificateTransparencyLog)) {
 687     std::string switch_value = command_line.GetSwitchValueASCII(
 688         switches::kCertificateTransparencyLog);
 689     for (const base::StringPiece& curr_log : base::SplitStringPiece(
 690              switch_value, ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL)) {
 691       std::vector<std::string> log_metadata = base::SplitString(
 692           curr_log, ":", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
 693       CHECK_GE(log_metadata.size(), 3u)
 694           << "CT log metadata missing: Switch format is "
 695           << "'description:base64_key:url_without_schema'.";
 696       std::string log_description(log_metadata[0]);
 697       std::string log_url(std::string("https://") + log_metadata[2]);
 698       std::string ct_public_key_data;
 699       CHECK(base::Base64Decode(log_metadata[1], &ct_public_key_data))
 700           << "Unable to decode CT public key.";
 701       scoped_refptr<net::CTLogVerifier> external_log_verifier(
 702           net::CTLogVerifier::Create(ct_public_key_data, log_description,
 703                                      log_url));
 704       CHECK(external_log_verifier) << "Unable to parse CT public key.";
 705       VLOG(1) << "Adding log with description " << log_description;
 706       ct_logs.push_back(external_log_verifier);
 707     }
 708   }
 709
 710   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 711   // is fixed.
 712   tracked_objects::ScopedTracker tracking_profile9(
 713       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 714           "466432 IOThread::InitAsync::CreateLogVerifiers::End"));
 715   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 716   // is fixed.
 717   tracked_objects::ScopedTracker tracking_profile7(
 718       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 719           "466432 IOThread::InitAsync::CreateMultiLogVerifier"));
 720   net::MultiLogCTVerifier* ct_verifier = new net::MultiLogCTVerifier();
 721   globals_->cert_transparency_verifier.reset(ct_verifier);
 722   // Add built-in logs
 723   ct_verifier->AddLogs(ct_logs);
 724
 725   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 726   // is fixed.
 727   tracked_objects::ScopedTracker tracking_profile10(
 728       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 729           "466432 IOThread::InitAsync::CertPolicyEnforcer"));
 730   net::CertPolicyEnforcer* policy_enforcer = new net::CertPolicyEnforcer;
 731   globals_->cert_policy_enforcer.reset(policy_enforcer);
 732
 733   globals_->ssl_config_service = GetSSLConfigService();
 734
 735   globals_->http_auth_handler_factory.reset(CreateDefaultAuthHandlerFactory(
 736       globals_->host_resolver.get()));
 737   globals_->http_server_properties.reset(new net::HttpServerPropertiesImpl());
 738   // For the ProxyScriptFetcher, we use a direct ProxyService.
 739   globals_->proxy_script_fetcher_proxy_service.reset(
 740       net::ProxyService::CreateDirectWithNetLog(net_log_));
 741   // In-memory cookie store.
 742   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 743   // is fixed.
 744   tracked_objects::ScopedTracker tracking_profile11(
 745       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 746           "466432 IOThread::InitAsync::CreateCookieStore::Start"));
 747   globals_->system_cookie_store =
 748         content::CreateCookieStore(content::CookieStoreConfig());
 749   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 750   // is fixed.
 751   tracked_objects::ScopedTracker tracking_profile12(
 752       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 753           "466432 IOThread::InitAsync::CreateCookieStore::End"));
 754   // In-memory channel ID store.
 755   globals_->system_channel_id_service.reset(
 756       new net::ChannelIDService(
 757           new net::DefaultChannelIDStore(NULL),
 758           base::WorkerPool::GetTaskRunner(true)));
 759   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 760   // is fixed.
 761   tracked_objects::ScopedTracker tracking_profile12_1(
 762       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 763           "466432 IOThread::InitAsync::CreateDnsProbeService"));
 764   globals_->dns_probe_service.reset(new chrome_browser_net::DnsProbeService());
 765   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 766   // is fixed.
 767   tracked_objects::ScopedTracker tracking_profile12_2(
 768       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 769           "466432 IOThread::InitAsync::CreateHostMappingRules"));
 770   globals_->host_mapping_rules.reset(new net::HostMappingRules());
 771   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 772   // is fixed.
 773   tracked_objects::ScopedTracker tracking_profile12_3(
 774       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 775           "466432 IOThread::InitAsync::CreateHTTPUserAgentSettings"));
 776   globals_->http_user_agent_settings.reset(
 777       new net::StaticHttpUserAgentSettings(std::string(), GetUserAgent()));
 778   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 779   // is fixed.
 780   tracked_objects::ScopedTracker tracking_profile12_4(
 781       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 782           "466432 IOThread::InitAsync::CommandLineConfiguration"));
 783   if (command_line.HasSwitch(switches::kHostRules)) {
 784     TRACE_EVENT_BEGIN0("startup", "IOThread::InitAsync:SetRulesFromString");
 785     globals_->host_mapping_rules->SetRulesFromString(
 786         command_line.GetSwitchValueASCII(switches::kHostRules));
 787     TRACE_EVENT_END0("startup", "IOThread::InitAsync:SetRulesFromString");
 788   }
 789   if (command_line.HasSwitch(switches::kIgnoreCertificateErrors))
 790     globals_->ignore_certificate_errors = true;
 791   if (command_line.HasSwitch(switches::kTestingFixedHttpPort)) {
 792     globals_->testing_fixed_http_port =
 793         GetSwitchValueAsInt(command_line, switches::kTestingFixedHttpPort);
 794   }
 795   if (command_line.HasSwitch(switches::kTestingFixedHttpsPort)) {
 796     globals_->testing_fixed_https_port =
 797         GetSwitchValueAsInt(command_line, switches::kTestingFixedHttpsPort);
 798   }
 799   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 800   // is fixed.
 801   tracked_objects::ScopedTracker tracking_profile12_5(
 802       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 803           "466432 IOThread::InitAsync::QuicConfiguration"));
 804   ConfigureQuic(command_line);
 805   if (command_line.HasSwitch(
 806           switches::kEnableUserAlternateProtocolPorts)) {
 807     globals_->enable_user_alternate_protocol_ports = true;
 808   }
 809   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 810   // is fixed.
 811   tracked_objects::ScopedTracker tracking_profile13(
 812       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 813           "466432 IOThread::InitAsync::InitializeNetworkOptions"));
 814   InitializeNetworkOptions(command_line);
 815
 816   net::HttpNetworkSession::Params session_params;
 817   InitializeNetworkSessionParams(&session_params);
 818   session_params.net_log = net_log_;
 819   session_params.proxy_service =
 820       globals_->proxy_script_fetcher_proxy_service.get();
 821
 822   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 823   // is fixed.
 824   tracked_objects::ScopedTracker tracking_profile14(
 825       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 826           "466432 IOThread::InitAsync::HttpNetorkSession::Start"));
 827   TRACE_EVENT_BEGIN0("startup", "IOThread::InitAsync:HttpNetworkSession");
 828   scoped_refptr<net::HttpNetworkSession> network_session(
 829       new net::HttpNetworkSession(session_params));
 830   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 831   // is fixed.
 832   tracked_objects::ScopedTracker tracking_profile15(
 833       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 834           "466432 IOThread::InitAsync::HttpNetorkSession::End"));
 835   globals_->proxy_script_fetcher_http_transaction_factory
 836       .reset(new net::HttpNetworkLayer(network_session.get()));
 837   TRACE_EVENT_END0("startup", "IOThread::InitAsync:HttpNetworkSession");
 838   scoped_ptr<net::URLRequestJobFactoryImpl> job_factory(
 839       new net::URLRequestJobFactoryImpl());
 840
 841   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 842   // is fixed.
 843   tracked_objects::ScopedTracker tracking_profile16(
 844       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 845           "466432 IOThread::InitAsync::SetProtocolHandler"));
 846   job_factory->SetProtocolHandler(url::kDataScheme,
 847                                   new net::DataProtocolHandler());
 848   job_factory->SetProtocolHandler(
 849       url::kFileScheme,
 850       new net::FileProtocolHandler(
 851           content::BrowserThread::GetBlockingPool()->
 852               GetTaskRunnerWithShutdownBehavior(
 853                   base::SequencedWorkerPool::SKIP_ON_SHUTDOWN)));
 854 #if !defined(DISABLE_FTP_SUPPORT)
 855   globals_->proxy_script_fetcher_ftp_transaction_factory.reset(
 856       new net::FtpNetworkLayer(globals_->host_resolver.get()));
 857   job_factory->SetProtocolHandler(
 858       url::kFtpScheme,
 859       new net::FtpProtocolHandler(
 860           globals_->proxy_script_fetcher_ftp_transaction_factory.get()));
 861 #endif
 862   globals_->proxy_script_fetcher_url_request_job_factory = job_factory.Pass();
 863
 864   globals_->proxy_script_fetcher_context.reset(
 865       ConstructProxyScriptFetcherContext(globals_, net_log_));
 866
 867 #if defined(OS_MACOSX) && !defined(OS_IOS)
 868   // Start observing Keychain events. This needs to be done on the UI thread,
 869   // as Keychain services requires a CFRunLoop.
 870   BrowserThread::PostTask(BrowserThread::UI,
 871                           FROM_HERE,
 872                           base::Bind(&ObserveKeychainEvents));
 873 #endif
 874
 875   // InitSystemRequestContext turns right around and posts a task back
 876   // to the IO thread, so we can't let it run until we know the IO
 877   // thread has started.
 878   //
 879   // Note that since we are at BrowserThread::Init time, the UI thread
 880   // is blocked waiting for the thread to start.  Therefore, posting
 881   // this task to the main thread's message loop here is guaranteed to
 882   // get it onto the message loop while the IOThread object still
 883   // exists.  However, the message might not be processed on the UI
 884   // thread until after IOThread is gone, so use a weak pointer.
 885   BrowserThread::PostTask(BrowserThread::UI,
 886                           FROM_HERE,
 887                           base::Bind(&IOThread::InitSystemRequestContext,
 888                                      weak_factory_.GetWeakPtr()));
 889 }
 890
 891 void IOThread::CleanUp() {
 892   base::debug::LeakTracker<SafeBrowsingURLRequestContext>::CheckForLeaks();
 893
 894 #if defined(USE_NSS_CERTS) || defined(OS_IOS)
 895   net::ShutdownNSSHttpIO();
 896 #endif
 897
 898   system_url_request_context_getter_ = NULL;
 899
 900   // Release objects that the net::URLRequestContext could have been pointing
 901   // to.
 902
 903   // Shutdown the HistogramWatcher on the IO thread.
 904   net::NetworkChangeNotifier::ShutdownHistogramWatcher();
 905
 906   // This must be reset before the ChromeNetLog is destroyed.
 907   network_change_observer_.reset();
 908
 909   system_proxy_config_service_.reset();
 910
 911   delete globals_;
 912   globals_ = NULL;
 913
 914   base::debug::LeakTracker<SystemURLRequestContextGetter>::CheckForLeaks();
 915 }
 916
 917 void IOThread::InitializeNetworkOptions(const base::CommandLine& command_line) {
 918   // Only handle use-spdy command line flags if "spdy.disabled" preference is
 919   // not disabled via policy.
 920   if (is_spdy_disabled_by_policy_) {
 921     base::FieldTrial* trial = base::FieldTrialList::Find(kSpdyFieldTrialName);
 922     if (trial)
 923       trial->Disable();
 924   } else {
 925     std::string group = base::FieldTrialList::FindFullName(kSpdyFieldTrialName);
 926     VariationParameters params;
 927     if (!variations::GetVariationParams(kSpdyFieldTrialName, &params)) {
 928       params.clear();
 929     }
 930     ConfigureSpdyGlobals(command_line, group, params, globals_);
 931   }
 932
 933   ConfigureTCPFastOpen(command_line);
 934
 935   // TODO(rch): Make the client socket factory a per-network session
 936   // instance, constructed from a NetworkSession::Params, to allow us
 937   // to move this option to IOThread::Globals &
 938   // HttpNetworkSession::Params.
 939 }
 940
 941 void IOThread::ConfigureTCPFastOpen(const base::CommandLine& command_line) {
 942   const std::string trial_group =
 943       base::FieldTrialList::FindFullName(kTCPFastOpenFieldTrialName);
 944   if (trial_group == kTCPFastOpenHttpsEnabledGroupName)
 945     globals_->enable_tcp_fast_open_for_ssl.set(true);
 946   bool always_enable_if_supported =
 947       command_line.HasSwitch(switches::kEnableTcpFastOpen);
 948   // Check for OS support of TCP FastOpen, and turn it on for all connections
 949   // if indicated by user.
 950   net::CheckSupportAndMaybeEnableTCPFastOpen(always_enable_if_supported);
 951 }
 952
 953 // static
 954 void IOThread::ConfigureSpdyGlobals(
 955     const base::CommandLine& command_line,
 956     base::StringPiece spdy_trial_group,
 957     const VariationParameters& spdy_trial_params,
 958     IOThread::Globals* globals) {
 959   if (command_line.HasSwitch(switches::kTrustedSpdyProxy)) {
 960     globals->trusted_spdy_proxy.set(
 961         command_line.GetSwitchValueASCII(switches::kTrustedSpdyProxy));
 962   }
 963   if (command_line.HasSwitch(switches::kIgnoreUrlFetcherCertRequests))
 964     net::URLFetcher::SetIgnoreCertificateRequests(true);
 965
 966   if (command_line.HasSwitch(switches::kUseSpdy)) {
 967     std::string spdy_mode =
 968         command_line.GetSwitchValueASCII(switches::kUseSpdy);
 969     ConfigureSpdyGlobalsFromUseSpdyArgument(spdy_mode, globals);
 970     return;
 971   }
 972
 973   globals->next_protos.clear();
 974   globals->next_protos.push_back(net::kProtoHTTP11);
 975   bool enable_quic = false;
 976   globals->enable_quic.CopyToIfSet(&enable_quic);
 977   if (enable_quic) {
 978     globals->next_protos.push_back(net::kProtoQUIC1SPDY3);
 979   }
 980
 981   // No SPDY command-line flags have been specified. Examine trial groups.
 982   if (spdy_trial_group.starts_with(kSpdyFieldTrialHoldbackGroupNamePrefix)) {
 983     net::HttpStreamFactory::set_spdy_enabled(false);
 984     return;
 985   }
 986   if (spdy_trial_group.starts_with(kSpdyFieldTrialSpdy31GroupNamePrefix)) {
 987     globals->next_protos.push_back(net::kProtoSPDY31);
 988     globals->use_alternate_protocols.set(true);
 989     return;
 990   }
 991   if (spdy_trial_group.starts_with(kSpdyFieldTrialSpdy4GroupNamePrefix)) {
 992     globals->next_protos.push_back(net::kProtoSPDY31);
 993     globals->next_protos.push_back(net::kProtoHTTP2_14);
 994     globals->next_protos.push_back(net::kProtoHTTP2);
 995     globals->use_alternate_protocols.set(true);
 996     return;
 997   }
 998   if (spdy_trial_group.starts_with(kSpdyFieldTrialParametrizedPrefix)) {
 999     bool spdy_enabled = false;
1000     if (base::LowerCaseEqualsASCII(
1001             GetVariationParam(spdy_trial_params, "enable_spdy31"), "true")) {
1002       globals->next_protos.push_back(net::kProtoSPDY31);
1003       spdy_enabled = true;
1004     }
1005     if (base::LowerCaseEqualsASCII(
1006             GetVariationParam(spdy_trial_params, "enable_http2_14"), "true")) {
1007       globals->next_protos.push_back(net::kProtoHTTP2_14);
1008       spdy_enabled = true;
1009     }
1010     if (base::LowerCaseEqualsASCII(
1011             GetVariationParam(spdy_trial_params, "enable_http2"), "true")) {
1012       globals->next_protos.push_back(net::kProtoHTTP2);
1013       spdy_enabled = true;
1014     }
1015     // TODO(bnc): HttpStreamFactory::spdy_enabled_ is redundant with
1016     // globals->next_protos, can it be eliminated?
1017     net::HttpStreamFactory::set_spdy_enabled(spdy_enabled);
1018     globals->use_alternate_protocols.set(true);
1019     return;
1020   }
1021
1022   // By default, enable HTTP/2.
1023   globals->next_protos.push_back(net::kProtoSPDY31);
1024   globals->next_protos.push_back(net::kProtoHTTP2_14);
1025   globals->next_protos.push_back(net::kProtoHTTP2);
1026   globals->use_alternate_protocols.set(true);
1027 }
1028
1029 // static
1030 void IOThread::RegisterPrefs(PrefRegistrySimple* registry) {
1031   registry->RegisterStringPref(prefs::kAuthSchemes,
1032                                "basic,digest,ntlm,negotiate");
1033   registry->RegisterBooleanPref(prefs::kDisableAuthNegotiateCnameLookup, false);
1034   registry->RegisterBooleanPref(prefs::kEnableAuthNegotiatePort, false);
1035   registry->RegisterStringPref(prefs::kAuthServerWhitelist, std::string());
1036   registry->RegisterStringPref(prefs::kAuthNegotiateDelegateWhitelist,
1037                                std::string());
1038   registry->RegisterStringPref(prefs::kGSSAPILibraryName, std::string());
1039   registry->RegisterStringPref(prefs::kAuthAndroidNegotiateAccountType,
1040                                std::string());
1041   registry->RegisterStringPref(
1042       data_reduction_proxy::prefs::kDataReductionProxy, std::string());
1043   registry->RegisterBooleanPref(prefs::kEnableReferrers, true);
1044   data_reduction_proxy::RegisterPrefs(registry);
1045   registry->RegisterBooleanPref(prefs::kBuiltInDnsClientEnabled, true);
1046   registry->RegisterBooleanPref(prefs::kQuickCheckEnabled, true);
1047 }
1048
1049 net::HttpAuthHandlerFactory* IOThread::CreateDefaultAuthHandlerFactory(
1050     net::HostResolver* resolver) {
1051   net::HttpAuthFilterWhitelist* auth_filter_default_credentials = NULL;
1052   if (!auth_server_whitelist_.empty()) {
1053     auth_filter_default_credentials =
1054         new net::HttpAuthFilterWhitelist(auth_server_whitelist_);
1055   }
1056   net::HttpAuthFilterWhitelist* auth_filter_delegate = NULL;
1057   if (!auth_delegate_whitelist_.empty()) {
1058     auth_filter_delegate =
1059         new net::HttpAuthFilterWhitelist(auth_delegate_whitelist_);
1060   }
1061   globals_->url_security_manager.reset(
1062       net::URLSecurityManager::Create(auth_filter_default_credentials,
1063                                       auth_filter_delegate));
1064   std::vector<std::string> supported_schemes;
1065   base::SplitString(auth_schemes_, ',', &supported_schemes);
1066
1067   scoped_ptr<net::HttpAuthHandlerRegistryFactory> registry_factory(
1068       net::HttpAuthHandlerRegistryFactory::Create(
1069           supported_schemes, globals_->url_security_manager.get(), resolver,
1070           gssapi_library_name_, auth_android_negotiate_account_type_,
1071           negotiate_disable_cname_lookup_, negotiate_enable_port_));
1072   return registry_factory.release();
1073 }
1074
1075 void IOThread::ClearHostCache() {
1076   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
1077
1078   net::HostCache* host_cache = globals_->host_resolver->GetHostCache();
1079   if (host_cache)
1080     host_cache->clear();
1081 }
1082
1083 void IOThread::InitializeNetworkSessionParams(
1084     net::HttpNetworkSession::Params* params) {
1085   InitializeNetworkSessionParamsFromGlobals(*globals_, params);
1086 }
1087
1088 // static
1089 void IOThread::InitializeNetworkSessionParamsFromGlobals(
1090     const IOThread::Globals& globals,
1091     net::HttpNetworkSession::Params* params) {
1092   params->host_resolver = globals.host_resolver.get();
1093   params->cert_verifier = globals.cert_verifier.get();
1094   params->cert_policy_enforcer = globals.cert_policy_enforcer.get();
1095   params->channel_id_service = globals.system_channel_id_service.get();
1096   params->transport_security_state = globals.transport_security_state.get();
1097   params->ssl_config_service = globals.ssl_config_service.get();
1098   params->http_auth_handler_factory = globals.http_auth_handler_factory.get();
1099   params->http_server_properties =
1100       globals.http_server_properties->GetWeakPtr();
1101   params->network_delegate = globals.system_network_delegate.get();
1102   params->host_mapping_rules = globals.host_mapping_rules.get();
1103   params->ignore_certificate_errors = globals.ignore_certificate_errors;
1104   params->testing_fixed_http_port = globals.testing_fixed_http_port;
1105   params->testing_fixed_https_port = globals.testing_fixed_https_port;
1106   globals.enable_tcp_fast_open_for_ssl.CopyToIfSet(
1107       &params->enable_tcp_fast_open_for_ssl);
1108
1109   globals.initial_max_spdy_concurrent_streams.CopyToIfSet(
1110       &params->spdy_initial_max_concurrent_streams);
1111   globals.enable_spdy_compression.CopyToIfSet(
1112       &params->enable_spdy_compression);
1113   globals.enable_spdy_ping_based_connection_checking.CopyToIfSet(
1114       &params->enable_spdy_ping_based_connection_checking);
1115   globals.spdy_default_protocol.CopyToIfSet(
1116       &params->spdy_default_protocol);
1117   params->next_protos = globals.next_protos;
1118   globals.trusted_spdy_proxy.CopyToIfSet(&params->trusted_spdy_proxy);
1119   params->forced_spdy_exclusions = globals.forced_spdy_exclusions;
1120   globals.use_alternate_protocols.CopyToIfSet(
1121       &params->use_alternate_protocols);
1122   globals.alternative_service_probability_threshold.CopyToIfSet(
1123       &params->alternative_service_probability_threshold);
1124
1125   globals.enable_quic.CopyToIfSet(&params->enable_quic);
1126   globals.disable_insecure_quic.CopyToIfSet(&params->disable_insecure_quic);
1127   globals.enable_quic_for_proxies.CopyToIfSet(&params->enable_quic_for_proxies);
1128   globals.quic_always_require_handshake_confirmation.CopyToIfSet(
1129       &params->quic_always_require_handshake_confirmation);
1130   globals.quic_disable_connection_pooling.CopyToIfSet(
1131       &params->quic_disable_connection_pooling);
1132   globals.quic_load_server_info_timeout_srtt_multiplier.CopyToIfSet(
1133       &params->quic_load_server_info_timeout_srtt_multiplier);
1134   globals.quic_enable_connection_racing.CopyToIfSet(
1135       &params->quic_enable_connection_racing);
1136   globals.quic_enable_non_blocking_io.CopyToIfSet(
1137       &params->quic_enable_non_blocking_io);
1138   globals.quic_prefer_aes.CopyToIfSet(&params->quic_prefer_aes);
1139   globals.quic_disable_disk_cache.CopyToIfSet(
1140       &params->quic_disable_disk_cache);
1141   globals.quic_max_number_of_lossy_connections.CopyToIfSet(
1142       &params->quic_max_number_of_lossy_connections);
1143   globals.quic_packet_loss_threshold.CopyToIfSet(
1144       &params->quic_packet_loss_threshold);
1145   globals.quic_socket_receive_buffer_size.CopyToIfSet(
1146       &params->quic_socket_receive_buffer_size);
1147   globals.enable_quic_port_selection.CopyToIfSet(
1148       &params->enable_quic_port_selection);
1149   globals.quic_max_packet_length.CopyToIfSet(&params->quic_max_packet_length);
1150   globals.quic_user_agent_id.CopyToIfSet(&params->quic_user_agent_id);
1151   globals.quic_supported_versions.CopyToIfSet(
1152       &params->quic_supported_versions);
1153   params->quic_connection_options = globals.quic_connection_options;
1154
1155   globals.origin_to_force_quic_on.CopyToIfSet(
1156       &params->origin_to_force_quic_on);
1157   params->enable_user_alternate_protocol_ports =
1158       globals.enable_user_alternate_protocol_ports;
1159 }
1160
1161 base::TimeTicks IOThread::creation_time() const {
1162   return creation_time_;
1163 }
1164
1165 net::SSLConfigService* IOThread::GetSSLConfigService() {
1166   return ssl_config_service_manager_->Get();
1167 }
1168
1169 void IOThread::ChangedToOnTheRecordOnIOThread() {
1170   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
1171
1172   // Clear the host cache to avoid showing entries from the OTR session
1173   // in about:net-internals.
1174   ClearHostCache();
1175 }
1176
1177 void IOThread::InitSystemRequestContext() {
1178   if (system_url_request_context_getter_.get())
1179     return;
1180   // If we're in unit_tests, IOThread may not be run.
1181   if (!BrowserThread::IsMessageLoopValid(BrowserThread::IO))
1182     return;
1183   system_proxy_config_service_.reset(
1184       ProxyServiceFactory::CreateProxyConfigService(
1185           pref_proxy_config_tracker_.get()));
1186   system_url_request_context_getter_ =
1187       new SystemURLRequestContextGetter(this);
1188   // Safe to post an unretained this pointer, since IOThread is
1189   // guaranteed to outlive the IO BrowserThread.
1190   BrowserThread::PostTask(
1191       BrowserThread::IO,
1192       FROM_HERE,
1193       base::Bind(&IOThread::InitSystemRequestContextOnIOThread,
1194                  base::Unretained(this)));
1195 }
1196
1197 void IOThread::InitSystemRequestContextOnIOThread() {
1198   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
1199   DCHECK(!globals_->system_proxy_service.get());
1200   DCHECK(system_proxy_config_service_.get());
1201
1202   const base::CommandLine& command_line =
1203       *base::CommandLine::ForCurrentProcess();
1204   globals_->system_proxy_service.reset(
1205       ProxyServiceFactory::CreateProxyService(
1206           net_log_,
1207           globals_->proxy_script_fetcher_context.get(),
1208           globals_->system_network_delegate.get(),
1209           system_proxy_config_service_.release(),
1210           command_line,
1211           quick_check_enabled_.GetValue()));
1212
1213   net::HttpNetworkSession::Params system_params;
1214   InitializeNetworkSessionParams(&system_params);
1215   system_params.net_log = net_log_;
1216   system_params.proxy_service = globals_->system_proxy_service.get();
1217
1218   globals_->system_http_transaction_factory.reset(
1219       new net::HttpNetworkLayer(
1220           new net::HttpNetworkSession(system_params)));
1221   globals_->system_url_request_job_factory.reset(
1222       new net::URLRequestJobFactoryImpl());
1223   globals_->system_request_context.reset(
1224       ConstructSystemRequestContext(globals_, net_log_));
1225   globals_->system_request_context->set_ssl_config_service(
1226       globals_->ssl_config_service.get());
1227   globals_->system_request_context->set_http_server_properties(
1228       globals_->http_server_properties->GetWeakPtr());
1229 }
1230
1231 void IOThread::UpdateDnsClientEnabled() {
1232   globals()->host_resolver->SetDnsClientEnabled(*dns_client_enabled_);
1233 }
1234
1235 void IOThread::ConfigureQuic(const base::CommandLine& command_line) {
1236   // Always fetch the field trial group to ensure it is reported correctly.
1237   // The command line flags will be associated with a group that is reported
1238   // so long as trial is actually queried.
1239   std::string group =
1240       base::FieldTrialList::FindFullName(kQuicFieldTrialName);
1241   VariationParameters params;
1242   if (!variations::GetVariationParams(kQuicFieldTrialName, &params)) {
1243     params.clear();
1244   }
1245
1246   ConfigureQuicGlobals(command_line, group, params, is_quic_allowed_by_policy_,
1247                        globals_);
1248 }
1249
1250 // static
1251 void IOThread::ConfigureQuicGlobals(
1252     const base::CommandLine& command_line,
1253     base::StringPiece quic_trial_group,
1254     const VariationParameters& quic_trial_params,
1255     bool quic_allowed_by_policy,
1256     IOThread::Globals* globals) {
1257   bool enable_quic = ShouldEnableQuic(command_line, quic_trial_group,
1258                                       quic_allowed_by_policy);
1259   globals->enable_quic.set(enable_quic);
1260   bool enable_quic_for_proxies = ShouldEnableQuicForProxies(
1261       command_line, quic_trial_group, quic_allowed_by_policy);
1262   globals->enable_quic_for_proxies.set(enable_quic_for_proxies);
1263   if (enable_quic) {
1264     globals->disable_insecure_quic.set(
1265         ShouldDisableInsecureQuic(quic_trial_params));
1266     globals->quic_always_require_handshake_confirmation.set(
1267         ShouldQuicAlwaysRequireHandshakeConfirmation(quic_trial_params));
1268     globals->quic_disable_connection_pooling.set(
1269         ShouldQuicDisableConnectionPooling(quic_trial_params));
1270     int receive_buffer_size = GetQuicSocketReceiveBufferSize(quic_trial_params);
1271     if (receive_buffer_size != 0) {
1272       globals->quic_socket_receive_buffer_size.set(receive_buffer_size);
1273     }
1274     float load_server_info_timeout_srtt_multiplier =
1275         GetQuicLoadServerInfoTimeoutSrttMultiplier(quic_trial_params);
1276     if (load_server_info_timeout_srtt_multiplier != 0) {
1277       globals->quic_load_server_info_timeout_srtt_multiplier.set(
1278           load_server_info_timeout_srtt_multiplier);
1279     }
1280     globals->quic_enable_connection_racing.set(
1281         ShouldQuicEnableConnectionRacing(quic_trial_params));
1282     globals->quic_enable_non_blocking_io.set(
1283         ShouldQuicEnableNonBlockingIO(quic_trial_params));
1284     globals->quic_disable_disk_cache.set(
1285         ShouldQuicDisableDiskCache(quic_trial_params));
1286     globals->quic_prefer_aes.set(
1287         ShouldQuicPreferAes(quic_trial_params));
1288     int max_number_of_lossy_connections = GetQuicMaxNumberOfLossyConnections(
1289         quic_trial_params);
1290     if (max_number_of_lossy_connections != 0) {
1291       globals->quic_max_number_of_lossy_connections.set(
1292           max_number_of_lossy_connections);
1293     }
1294     float packet_loss_threshold = GetQuicPacketLossThreshold(quic_trial_params);
1295     if (packet_loss_threshold != 0)
1296       globals->quic_packet_loss_threshold.set(packet_loss_threshold);
1297     globals->enable_quic_port_selection.set(
1298         ShouldEnableQuicPortSelection(command_line));
1299     globals->quic_connection_options =
1300         GetQuicConnectionOptions(command_line, quic_trial_params);
1301   }
1302
1303   size_t max_packet_length = GetQuicMaxPacketLength(command_line,
1304                                                     quic_trial_params);
1305   if (max_packet_length != 0) {
1306     globals->quic_max_packet_length.set(max_packet_length);
1307   }
1308
1309   std::string quic_user_agent_id =
1310       chrome::VersionInfo::GetVersionStringModifier();
1311   if (!quic_user_agent_id.empty())
1312     quic_user_agent_id.push_back(' ');
1313   chrome::VersionInfo version_info;
1314   quic_user_agent_id.append(version_info.ProductNameAndVersionForUserAgent());
1315   quic_user_agent_id.push_back(' ');
1316   quic_user_agent_id.append(content::BuildOSCpuInfo());
1317   globals->quic_user_agent_id.set(quic_user_agent_id);
1318
1319   net::QuicVersion version = GetQuicVersion(command_line, quic_trial_params);
1320   if (version != net::QUIC_VERSION_UNSUPPORTED) {
1321     net::QuicVersionVector supported_versions;
1322     supported_versions.push_back(version);
1323     globals->quic_supported_versions.set(supported_versions);
1324   }
1325
1326   double threshold = GetAlternativeProtocolProbabilityThreshold(
1327       command_line, quic_trial_params);
1328   if (threshold >=0 && threshold <= 1) {
1329     globals->alternative_service_probability_threshold.set(threshold);
1330     globals->http_server_properties->SetAlternativeServiceProbabilityThreshold(
1331         threshold);
1332   }
1333
1334   if (command_line.HasSwitch(switches::kOriginToForceQuicOn)) {
1335     net::HostPortPair quic_origin =
1336         net::HostPortPair::FromString(
1337             command_line.GetSwitchValueASCII(switches::kOriginToForceQuicOn));
1338     if (!quic_origin.IsEmpty()) {
1339       globals->origin_to_force_quic_on.set(quic_origin);
1340     }
1341   }
1342 }
1343
1344 bool IOThread::ShouldEnableQuic(const base::CommandLine& command_line,
1345                                 base::StringPiece quic_trial_group,
1346                                 bool quic_allowed_by_policy) {
1347   if (command_line.HasSwitch(switches::kDisableQuic) || !quic_allowed_by_policy)
1348     return false;
1349
1350   if (command_line.HasSwitch(switches::kEnableQuic))
1351     return true;
1352
1353   return quic_trial_group.starts_with(kQuicFieldTrialEnabledGroupName) ||
1354       quic_trial_group.starts_with(kQuicFieldTrialHttpsEnabledGroupName);
1355 }
1356
1357 // static
1358 bool IOThread::ShouldEnableQuicForProxies(const base::CommandLine& command_line,
1359                                           base::StringPiece quic_trial_group,
1360                                           bool quic_allowed_by_policy) {
1361   return ShouldEnableQuic(
1362       command_line, quic_trial_group, quic_allowed_by_policy) ||
1363       ShouldEnableQuicForDataReductionProxy();
1364 }
1365
1366 // static
1367 bool IOThread::ShouldEnableQuicForDataReductionProxy() {
1368   const base::CommandLine& command_line =
1369         *base::CommandLine::ForCurrentProcess();
1370
1371   if (command_line.HasSwitch(switches::kDisableQuic))
1372     return false;
1373
1374   return data_reduction_proxy::params::IsIncludedInQuicFieldTrial();
1375 }
1376
1377 // static
1378 bool IOThread::ShouldDisableInsecureQuic(
1379     const VariationParameters& quic_trial_params) {
1380   return base::LowerCaseEqualsASCII(
1381       GetVariationParam(quic_trial_params, "disable_insecure_quic"),
1382       "true");
1383 }
1384
1385 bool IOThread::ShouldEnableQuicPortSelection(
1386     const base::CommandLine& command_line) {
1387   if (command_line.HasSwitch(switches::kDisableQuicPortSelection))
1388     return false;
1389
1390   if (command_line.HasSwitch(switches::kEnableQuicPortSelection))
1391     return true;
1392
1393   return false;  // Default to disabling port selection on all channels.
1394 }
1395
1396 net::QuicTagVector IOThread::GetQuicConnectionOptions(
1397     const base::CommandLine& command_line,
1398     const VariationParameters& quic_trial_params) {
1399   if (command_line.HasSwitch(switches::kQuicConnectionOptions)) {
1400     return net::QuicUtils::ParseQuicConnectionOptions(
1401         command_line.GetSwitchValueASCII(switches::kQuicConnectionOptions));
1402   }
1403
1404   VariationParameters::const_iterator it =
1405       quic_trial_params.find("connection_options");
1406   if (it == quic_trial_params.end()) {
1407     return net::QuicTagVector();
1408   }
1409
1410   return net::QuicUtils::ParseQuicConnectionOptions(it->second);
1411 }
1412
1413 // static
1414 double IOThread::GetAlternativeProtocolProbabilityThreshold(
1415     const base::CommandLine& command_line,
1416     const VariationParameters& quic_trial_params) {
1417   double value;
1418   if (command_line.HasSwitch(
1419           switches::kAlternativeServiceProbabilityThreshold)) {
1420     if (base::StringToDouble(
1421             command_line.GetSwitchValueASCII(
1422                 switches::kAlternativeServiceProbabilityThreshold),
1423             &value)) {
1424       return value;
1425     }
1426   }
1427   if (command_line.HasSwitch(switches::kEnableQuic)) {
1428     return 0;
1429   }
1430   // TODO(bnc): Remove when new parameter name rolls out and server
1431   // configuration is changed.
1432   if (base::StringToDouble(
1433           GetVariationParam(quic_trial_params,
1434                             "alternate_protocol_probability_threshold"),
1435           &value)) {
1436     return value;
1437   }
1438   if (base::StringToDouble(
1439           GetVariationParam(quic_trial_params,
1440                             "alternative_service_probability_threshold"),
1441           &value)) {
1442     return value;
1443   }
1444   return -1;
1445 }
1446
1447 // static
1448 bool IOThread::ShouldQuicAlwaysRequireHandshakeConfirmation(
1449     const VariationParameters& quic_trial_params) {
1450   return base::LowerCaseEqualsASCII(
1451       GetVariationParam(quic_trial_params,
1452                         "always_require_handshake_confirmation"),
1453       "true");
1454 }
1455
1456 // static
1457 bool IOThread::ShouldQuicDisableConnectionPooling(
1458     const VariationParameters& quic_trial_params) {
1459   return base::LowerCaseEqualsASCII(
1460       GetVariationParam(quic_trial_params, "disable_connection_pooling"),
1461       "true");
1462 }
1463
1464 // static
1465 float IOThread::GetQuicLoadServerInfoTimeoutSrttMultiplier(
1466     const VariationParameters& quic_trial_params) {
1467   double value;
1468   if (base::StringToDouble(GetVariationParam(quic_trial_params,
1469                                              "load_server_info_time_to_srtt"),
1470                            &value)) {
1471     return (float)value;
1472   }
1473   return 0.0f;
1474 }
1475
1476 // static
1477 bool IOThread::ShouldQuicEnableConnectionRacing(
1478     const VariationParameters& quic_trial_params) {
1479   return base::LowerCaseEqualsASCII(
1480       GetVariationParam(quic_trial_params, "enable_connection_racing"),
1481       "true");
1482 }
1483
1484 // static
1485 bool IOThread::ShouldQuicEnableNonBlockingIO(
1486     const VariationParameters& quic_trial_params) {
1487   return base::LowerCaseEqualsASCII(
1488       GetVariationParam(quic_trial_params, "enable_non_blocking_io"),
1489       "true");
1490 }
1491
1492 // static
1493 bool IOThread::ShouldQuicDisableDiskCache(
1494     const VariationParameters& quic_trial_params) {
1495   return base::LowerCaseEqualsASCII(
1496       GetVariationParam(quic_trial_params, "disable_disk_cache"), "true");
1497 }
1498
1499 // static
1500 bool IOThread::ShouldQuicPreferAes(
1501     const VariationParameters& quic_trial_params) {
1502   return base::LowerCaseEqualsASCII(
1503       GetVariationParam(quic_trial_params, "prefer_aes"), "true");
1504 }
1505
1506 // static
1507 int IOThread::GetQuicMaxNumberOfLossyConnections(
1508     const VariationParameters& quic_trial_params) {
1509   int value;
1510   if (base::StringToInt(GetVariationParam(quic_trial_params,
1511                                           "max_number_of_lossy_connections"),
1512                         &value)) {
1513     return value;
1514   }
1515   return 0;
1516 }
1517
1518 // static
1519 float IOThread::GetQuicPacketLossThreshold(
1520     const VariationParameters& quic_trial_params) {
1521   double value;
1522   if (base::StringToDouble(GetVariationParam(quic_trial_params,
1523                                              "packet_loss_threshold"),
1524                            &value)) {
1525     return (float)value;
1526   }
1527   return 0.0f;
1528 }
1529
1530 // static
1531 int IOThread::GetQuicSocketReceiveBufferSize(
1532     const VariationParameters& quic_trial_params) {
1533   int value;
1534   if (base::StringToInt(GetVariationParam(quic_trial_params,
1535                                           "receive_buffer_size"),
1536                         &value)) {
1537     return value;
1538   }
1539   return 0;
1540 }
1541
1542 // static
1543 size_t IOThread::GetQuicMaxPacketLength(
1544     const base::CommandLine& command_line,
1545     const VariationParameters& quic_trial_params) {
1546   if (command_line.HasSwitch(switches::kQuicMaxPacketLength)) {
1547     unsigned value;
1548     if (!base::StringToUint(
1549             command_line.GetSwitchValueASCII(switches::kQuicMaxPacketLength),
1550             &value)) {
1551       return 0;
1552     }
1553     return value;
1554   }
1555
1556   unsigned value;
1557   if (base::StringToUint(GetVariationParam(quic_trial_params,
1558                                            "max_packet_length"),
1559                          &value)) {
1560     return value;
1561   }
1562   return 0;
1563 }
1564
1565 // static
1566 net::QuicVersion IOThread::GetQuicVersion(
1567     const base::CommandLine& command_line,
1568     const VariationParameters& quic_trial_params) {
1569   if (command_line.HasSwitch(switches::kQuicVersion)) {
1570     return ParseQuicVersion(
1571         command_line.GetSwitchValueASCII(switches::kQuicVersion));
1572   }
1573
1574   return ParseQuicVersion(GetVariationParam(quic_trial_params, "quic_version"));
1575 }
1576
1577 // static
1578 net::QuicVersion IOThread::ParseQuicVersion(const std::string& quic_version) {
1579   net::QuicVersionVector supported_versions = net::QuicSupportedVersions();
1580   for (size_t i = 0; i < supported_versions.size(); ++i) {
1581     net::QuicVersion version = supported_versions[i];
1582     if (net::QuicVersionToString(version) == quic_version) {
1583       return version;
1584     }
1585   }
1586
1587   return net::QUIC_VERSION_UNSUPPORTED;
1588 }