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 "net/base/host_mapping_rules.h"
  50 #include "net/base/net_util.h"
  51 #include "net/base/sdch_manager.h"
  52 #include "net/cert/cert_policy_enforcer.h"
  53 #include "net/cert/cert_verifier.h"
  54 #include "net/cert/cert_verify_proc.h"
  55 #include "net/cert/ct_known_logs.h"
  56 #include "net/cert/ct_known_logs_static.h"
  57 #include "net/cert/ct_log_verifier.h"
  58 #include "net/cert/ct_verifier.h"
  59 #include "net/cert/multi_log_ct_verifier.h"
  60 #include "net/cert/multi_threaded_cert_verifier.h"
  61 #include "net/cookies/cookie_store.h"
  62 #include "net/dns/host_cache.h"
  63 #include "net/dns/host_resolver.h"
  64 #include "net/dns/mapped_host_resolver.h"
  65 #include "net/ftp/ftp_network_layer.h"
  66 #include "net/http/http_auth_filter.h"
  67 #include "net/http/http_auth_handler_factory.h"
  68 #include "net/http/http_network_layer.h"
  69 #include "net/http/http_server_properties_impl.h"
  70 #include "net/proxy/proxy_config_service.h"
  71 #include "net/proxy/proxy_script_fetcher_impl.h"
  72 #include "net/proxy/proxy_service.h"
  73 #include "net/quic/crypto/crypto_protocol.h"
  74 #include "net/quic/quic_protocol.h"
  75 #include "net/quic/quic_utils.h"
  76 #include "net/socket/tcp_client_socket.h"
  77 #include "net/spdy/spdy_session.h"
  78 #include "net/ssl/channel_id_service.h"
  79 #include "net/ssl/default_channel_id_store.h"
  80 #include "net/url_request/data_protocol_handler.h"
  81 #include "net/url_request/file_protocol_handler.h"
  82 #include "net/url_request/ftp_protocol_handler.h"
  83 #include "net/url_request/static_http_user_agent_settings.h"
  84 #include "net/url_request/url_fetcher.h"
  85 #include "net/url_request/url_request_context.h"
  86 #include "net/url_request/url_request_context_getter.h"
  87 #include "net/url_request/url_request_job_factory_impl.h"
  88 #include "net/url_request/url_request_throttler_manager.h"
  89 #include "url/url_constants.h"
  90
  91 #if defined(ENABLE_CONFIGURATION_POLICY)
  92 #include "policy/policy_constants.h"
  93 #endif
  94
  95 #if defined(ENABLE_EXTENSIONS)
  96 #include "chrome/browser/extensions/event_router_forwarder.h"
  97 #endif
  98
  99 #if defined(USE_NSS_CERTS) || defined(OS_IOS)
 100 #include "net/cert_net/nss_ocsp.h"
 101 #endif
 102
 103 #if defined(OS_ANDROID)
 104 #include "base/android/build_info.h"
 105 #endif
 106
 107 #if defined(OS_CHROMEOS)
 108 #include "chrome/browser/chromeos/net/cert_verify_proc_chromeos.h"
 109 #include "chromeos/network/host_resolver_impl_chromeos.h"
 110 #endif
 111
 112 using content::BrowserThread;
 113
 114 class SafeBrowsingURLRequestContext;
 115
 116 // The IOThread object must outlive any tasks posted to the IO thread before the
 117 // Quit task, so base::Bind() calls are not refcounted.
 118
 119 namespace {
 120
 121 const char kTCPFastOpenFieldTrialName[] = "TCPFastOpen";
 122 const char kTCPFastOpenHttpsEnabledGroupName[] = "HttpsEnabled";
 123
 124 const char kQuicFieldTrialName[] = "QUIC";
 125 const char kQuicFieldTrialEnabledGroupName[] = "Enabled";
 126 const char kQuicFieldTrialHttpsEnabledGroupName[] = "HttpsEnabled";
 127
 128 // The SPDY trial composes two different trial plus control groups:
 129 //  * A "holdback" group with SPDY disabled, and corresponding control
 130 //  (SPDY/3.1). The primary purpose of the holdback group is to encourage site
 131 //  operators to do feature detection rather than UA-sniffing. As such, this
 132 //  trial runs continuously.
 133 //  * A SPDY/4 experiment, for SPDY/4 (aka HTTP/2) vs SPDY/3.1 comparisons and
 134 //  eventual SPDY/4 deployment.
 135 const char kSpdyFieldTrialName[] = "SPDY";
 136 const char kSpdyFieldTrialHoldbackGroupNamePrefix[] = "SpdyDisabled";
 137 const char kSpdyFieldTrialSpdy31GroupNamePrefix[] = "Spdy31Enabled";
 138 const char kSpdyFieldTrialSpdy4GroupNamePrefix[] = "Spdy4Enabled";
 139 const char kSpdyFieldTrialParametrizedPrefix[] = "Parametrized";
 140
 141 // Field trial for Cache-Control: stale-while-revalidate directive.
 142 const char kStaleWhileRevalidateFieldTrialName[] = "StaleWhileRevalidate";
 143
 144 #if defined(OS_MACOSX) && !defined(OS_IOS)
 145 void ObserveKeychainEvents() {
 146   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 147   net::CertDatabase::GetInstance()->SetMessageLoopForKeychainEvents();
 148 }
 149 #endif
 150
 151 // Used for the "system" URLRequestContext.
 152 class SystemURLRequestContext : public net::URLRequestContext {
 153  public:
 154   SystemURLRequestContext() {
 155 #if defined(USE_NSS_CERTS) || defined(OS_IOS)
 156     net::SetURLRequestContextForNSSHttpIO(this);
 157 #endif
 158   }
 159
 160  private:
 161   ~SystemURLRequestContext() override {
 162     AssertNoURLRequests();
 163 #if defined(USE_NSS_CERTS) || defined(OS_IOS)
 164     net::SetURLRequestContextForNSSHttpIO(NULL);
 165 #endif
 166   }
 167 };
 168
 169 scoped_ptr<net::HostResolver> CreateGlobalHostResolver(net::NetLog* net_log) {
 170   TRACE_EVENT0("startup", "IOThread::CreateGlobalHostResolver");
 171   const base::CommandLine& command_line =
 172       *base::CommandLine::ForCurrentProcess();
 173
 174   net::HostResolver::Options options;
 175
 176   // Use the retry attempts override from the command-line, if any.
 177   if (command_line.HasSwitch(switches::kHostResolverRetryAttempts)) {
 178     std::string s =
 179         command_line.GetSwitchValueASCII(switches::kHostResolverRetryAttempts);
 180     // Parse the switch (it should be a non-negative integer).
 181     int n;
 182     if (base::StringToInt(s, &n) && n >= 0) {
 183       options.max_retry_attempts = static_cast<size_t>(n);
 184     } else {
 185       LOG(ERROR) << "Invalid switch for host resolver retry attempts: " << s;
 186     }
 187   }
 188
 189   scoped_ptr<net::HostResolver> global_host_resolver;
 190 #if defined OS_CHROMEOS
 191   global_host_resolver =
 192       chromeos::HostResolverImplChromeOS::CreateSystemResolver(options,
 193                                                                net_log);
 194 #else
 195   global_host_resolver =
 196       net::HostResolver::CreateSystemResolver(options, net_log);
 197 #endif
 198
 199   // Determine if we should disable IPv6 support.
 200   if (command_line.HasSwitch(switches::kEnableIPv6)) {
 201     // Disable IPv6 probing.
 202     global_host_resolver->SetDefaultAddressFamily(
 203         net::ADDRESS_FAMILY_UNSPECIFIED);
 204   } else if (command_line.HasSwitch(switches::kDisableIPv6)) {
 205     global_host_resolver->SetDefaultAddressFamily(net::ADDRESS_FAMILY_IPV4);
 206   }
 207
 208   // If hostname remappings were specified on the command-line, layer these
 209   // rules on top of the real host resolver. This allows forwarding all requests
 210   // through a designated test server.
 211   if (!command_line.HasSwitch(switches::kHostResolverRules))
 212     return global_host_resolver.Pass();
 213
 214   scoped_ptr<net::MappedHostResolver> remapped_resolver(
 215       new net::MappedHostResolver(global_host_resolver.Pass()));
 216   remapped_resolver->SetRulesFromString(
 217       command_line.GetSwitchValueASCII(switches::kHostResolverRules));
 218   return remapped_resolver.Pass();
 219 }
 220
 221 // TODO(willchan): Remove proxy script fetcher context since it's not necessary
 222 // now that I got rid of refcounting URLRequestContexts.
 223 // See IOThread::Globals for details.
 224 net::URLRequestContext*
 225 ConstructProxyScriptFetcherContext(IOThread::Globals* globals,
 226                                    net::NetLog* net_log) {
 227   net::URLRequestContext* context = new net::URLRequestContext;
 228   context->set_net_log(net_log);
 229   context->set_host_resolver(globals->host_resolver.get());
 230   context->set_cert_verifier(globals->cert_verifier.get());
 231   context->set_transport_security_state(
 232       globals->transport_security_state.get());
 233   context->set_cert_transparency_verifier(
 234       globals->cert_transparency_verifier.get());
 235   context->set_http_auth_handler_factory(
 236       globals->http_auth_handler_factory.get());
 237   context->set_proxy_service(globals->proxy_script_fetcher_proxy_service.get());
 238   context->set_http_transaction_factory(
 239       globals->proxy_script_fetcher_http_transaction_factory.get());
 240   context->set_job_factory(
 241       globals->proxy_script_fetcher_url_request_job_factory.get());
 242   context->set_cookie_store(globals->system_cookie_store.get());
 243   context->set_channel_id_service(
 244       globals->system_channel_id_service.get());
 245   context->set_network_delegate(globals->system_network_delegate.get());
 246   context->set_http_user_agent_settings(
 247       globals->http_user_agent_settings.get());
 248   // TODO(rtenneti): We should probably use HttpServerPropertiesManager for the
 249   // system URLRequestContext too. There's no reason this should be tied to a
 250   // profile.
 251   return context;
 252 }
 253
 254 net::URLRequestContext*
 255 ConstructSystemRequestContext(IOThread::Globals* globals,
 256                               net::NetLog* net_log) {
 257   net::URLRequestContext* context = new SystemURLRequestContext;
 258   context->set_net_log(net_log);
 259   context->set_host_resolver(globals->host_resolver.get());
 260   context->set_cert_verifier(globals->cert_verifier.get());
 261   context->set_transport_security_state(
 262       globals->transport_security_state.get());
 263   context->set_cert_transparency_verifier(
 264       globals->cert_transparency_verifier.get());
 265   context->set_http_auth_handler_factory(
 266       globals->http_auth_handler_factory.get());
 267   context->set_proxy_service(globals->system_proxy_service.get());
 268   context->set_http_transaction_factory(
 269       globals->system_http_transaction_factory.get());
 270   context->set_job_factory(globals->system_url_request_job_factory.get());
 271   context->set_cookie_store(globals->system_cookie_store.get());
 272   context->set_channel_id_service(
 273       globals->system_channel_id_service.get());
 274   context->set_throttler_manager(globals->throttler_manager.get());
 275   context->set_network_delegate(globals->system_network_delegate.get());
 276   context->set_http_user_agent_settings(
 277       globals->http_user_agent_settings.get());
 278   return context;
 279 }
 280
 281 int GetSwitchValueAsInt(const base::CommandLine& command_line,
 282                         const std::string& switch_name) {
 283   int value;
 284   if (!base::StringToInt(command_line.GetSwitchValueASCII(switch_name),
 285                          &value)) {
 286     return 0;
 287   }
 288   return value;
 289 }
 290
 291 // Returns the value associated with |key| in |params| or "" if the
 292 // key is not present in the map.
 293 const std::string& GetVariationParam(
 294     const std::map<std::string, std::string>& params,
 295     const std::string& key) {
 296   std::map<std::string, std::string>::const_iterator it = params.find(key);
 297   if (it == params.end())
 298     return base::EmptyString();
 299
 300   return it->second;
 301 }
 302
 303 // Return true if stale-while-revalidate support should be enabled.
 304 bool IsStaleWhileRevalidateEnabled(const base::CommandLine& command_line) {
 305   if (command_line.HasSwitch(switches::kEnableStaleWhileRevalidate))
 306     return true;
 307   const std::string group_name =
 308       base::FieldTrialList::FindFullName(kStaleWhileRevalidateFieldTrialName);
 309   return group_name == "Enabled";
 310 }
 311
 312 bool IsCertificateTransparencyRequiredForEV(
 313     const base::CommandLine& command_line) {
 314   const std::string group_name =
 315       base::FieldTrialList::FindFullName("CTRequiredForEVTrial");
 316   if (command_line.HasSwitch(
 317         switches::kDisableCertificateTransparencyRequirementForEV))
 318     return false;
 319
 320   return group_name == "RequirementEnforced";
 321 }
 322
 323 // Parse kUseSpdy command line flag options, which may contain the following:
 324 //
 325 //   "off"                      : Disables SPDY support entirely.
 326 //   "no-ping"                  : Disables SPDY ping connection testing.
 327 //   "exclude=<host>"           : Disables SPDY support for the host <host>.
 328 //   "no-compress"              : Disables SPDY header compression.
 329 //   "no-alt-protocols          : Disables alternate protocol support.
 330 //   "init-max-streams=<limit>" : Specifies the maximum number of concurrent
 331 //                                streams for a SPDY session, unless the
 332 //                                specifies a different value via SETTINGS.
 333 void ConfigureSpdyGlobalsFromUseSpdyArgument(const std::string& mode,
 334                                              IOThread::Globals* globals) {
 335   static const char kOff[] = "off";
 336   static const char kDisablePing[] = "no-ping";
 337   static const char kExclude[] = "exclude";  // Hosts to exclude
 338   static const char kDisableCompression[] = "no-compress";
 339   static const char kDisableAltProtocols[] = "no-alt-protocols";
 340   static const char kInitialMaxConcurrentStreams[] = "init-max-streams";
 341
 342   std::vector<std::string> spdy_options;
 343   base::SplitString(mode, ',', &spdy_options);
 344
 345   for (const std::string& element : spdy_options) {
 346     std::vector<std::string> name_value;
 347     base::SplitString(element, '=', &name_value);
 348     const std::string& option =
 349         name_value.size() > 0 ? name_value[0] : std::string();
 350     const std::string value =
 351         name_value.size() > 1 ? name_value[1] : std::string();
 352
 353     if (option == kOff) {
 354       net::HttpStreamFactory::set_spdy_enabled(false);
 355       continue;
 356     }
 357     if (option == kDisablePing) {
 358       globals->enable_spdy_ping_based_connection_checking.set(false);
 359       continue;
 360     }
 361     if (option == kExclude) {
 362       globals->forced_spdy_exclusions.insert(
 363           net::HostPortPair::FromURL(GURL(value)));
 364       continue;
 365     }
 366     if (option == kDisableCompression) {
 367       globals->enable_spdy_compression.set(false);
 368       continue;
 369     }
 370     if (option == kDisableAltProtocols) {
 371       globals->use_alternate_protocols.set(false);
 372       continue;
 373     }
 374     if (option == kInitialMaxConcurrentStreams) {
 375       int streams;
 376       if (base::StringToInt(value, &streams)) {
 377         globals->initial_max_spdy_concurrent_streams.set(streams);
 378         continue;
 379       }
 380     }
 381     LOG(DFATAL) << "Unrecognized spdy option: " << option;
 382   }
 383 }
 384
 385 }  // namespace
 386
 387 class IOThread::LoggingNetworkChangeObserver
 388     : public net::NetworkChangeNotifier::IPAddressObserver,
 389       public net::NetworkChangeNotifier::ConnectionTypeObserver,
 390       public net::NetworkChangeNotifier::NetworkChangeObserver {
 391  public:
 392   // |net_log| must remain valid throughout our lifetime.
 393   explicit LoggingNetworkChangeObserver(net::NetLog* net_log)
 394       : net_log_(net_log) {
 395     net::NetworkChangeNotifier::AddIPAddressObserver(this);
 396     net::NetworkChangeNotifier::AddConnectionTypeObserver(this);
 397     net::NetworkChangeNotifier::AddNetworkChangeObserver(this);
 398   }
 399
 400   ~LoggingNetworkChangeObserver() override {
 401     net::NetworkChangeNotifier::RemoveIPAddressObserver(this);
 402     net::NetworkChangeNotifier::RemoveConnectionTypeObserver(this);
 403     net::NetworkChangeNotifier::RemoveNetworkChangeObserver(this);
 404   }
 405
 406   // NetworkChangeNotifier::IPAddressObserver implementation.
 407   void OnIPAddressChanged() override {
 408     VLOG(1) << "Observed a change to the network IP addresses";
 409
 410     net_log_->AddGlobalEntry(net::NetLog::TYPE_NETWORK_IP_ADDRESSES_CHANGED);
 411   }
 412
 413   // NetworkChangeNotifier::ConnectionTypeObserver implementation.
 414   void OnConnectionTypeChanged(
 415       net::NetworkChangeNotifier::ConnectionType type) override {
 416     std::string type_as_string =
 417         net::NetworkChangeNotifier::ConnectionTypeToString(type);
 418
 419     VLOG(1) << "Observed a change to network connectivity state "
 420             << type_as_string;
 421
 422     net_log_->AddGlobalEntry(
 423         net::NetLog::TYPE_NETWORK_CONNECTIVITY_CHANGED,
 424         net::NetLog::StringCallback("new_connection_type", &type_as_string));
 425   }
 426
 427   // NetworkChangeNotifier::NetworkChangeObserver implementation.
 428   void OnNetworkChanged(
 429       net::NetworkChangeNotifier::ConnectionType type) override {
 430     std::string type_as_string =
 431         net::NetworkChangeNotifier::ConnectionTypeToString(type);
 432
 433     VLOG(1) << "Observed a network change to state " << type_as_string;
 434
 435     net_log_->AddGlobalEntry(
 436         net::NetLog::TYPE_NETWORK_CHANGED,
 437         net::NetLog::StringCallback("new_connection_type", &type_as_string));
 438   }
 439
 440  private:
 441   net::NetLog* net_log_;
 442   DISALLOW_COPY_AND_ASSIGN(LoggingNetworkChangeObserver);
 443 };
 444
 445 class SystemURLRequestContextGetter : public net::URLRequestContextGetter {
 446  public:
 447   explicit SystemURLRequestContextGetter(IOThread* io_thread);
 448
 449   // Implementation for net::UrlRequestContextGetter.
 450   net::URLRequestContext* GetURLRequestContext() override;
 451   scoped_refptr<base::SingleThreadTaskRunner> GetNetworkTaskRunner()
 452       const override;
 453
 454  protected:
 455   ~SystemURLRequestContextGetter() override;
 456
 457  private:
 458   IOThread* const io_thread_;  // Weak pointer, owned by BrowserProcess.
 459   scoped_refptr<base::SingleThreadTaskRunner> network_task_runner_;
 460
 461   base::debug::LeakTracker<SystemURLRequestContextGetter> leak_tracker_;
 462 };
 463
 464 SystemURLRequestContextGetter::SystemURLRequestContextGetter(
 465     IOThread* io_thread)
 466     : io_thread_(io_thread),
 467       network_task_runner_(
 468           BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO)) {
 469 }
 470
 471 SystemURLRequestContextGetter::~SystemURLRequestContextGetter() {}
 472
 473 net::URLRequestContext* SystemURLRequestContextGetter::GetURLRequestContext() {
 474   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 475   DCHECK(io_thread_->globals()->system_request_context.get());
 476
 477   return io_thread_->globals()->system_request_context.get();
 478 }
 479
 480 scoped_refptr<base::SingleThreadTaskRunner>
 481 SystemURLRequestContextGetter::GetNetworkTaskRunner() const {
 482   return network_task_runner_;
 483 }
 484
 485 IOThread::Globals::
 486 SystemRequestContextLeakChecker::SystemRequestContextLeakChecker(
 487     Globals* globals)
 488     : globals_(globals) {
 489   DCHECK(globals_);
 490 }
 491
 492 IOThread::Globals::
 493 SystemRequestContextLeakChecker::~SystemRequestContextLeakChecker() {
 494   if (globals_->system_request_context.get())
 495     globals_->system_request_context->AssertNoURLRequests();
 496 }
 497
 498 IOThread::Globals::Globals()
 499     : system_request_context_leak_checker(this),
 500       ignore_certificate_errors(false),
 501       use_stale_while_revalidate(false),
 502       testing_fixed_http_port(0),
 503       testing_fixed_https_port(0),
 504       enable_user_alternate_protocol_ports(false) {
 505 }
 506
 507 IOThread::Globals::~Globals() {}
 508
 509 // |local_state| is passed in explicitly in order to (1) reduce implicit
 510 // dependencies and (2) make IOThread more flexible for testing.
 511 IOThread::IOThread(
 512     PrefService* local_state,
 513     policy::PolicyService* policy_service,
 514     ChromeNetLog* net_log,
 515     extensions::EventRouterForwarder* extension_event_router_forwarder)
 516     : net_log_(net_log),
 517 #if defined(ENABLE_EXTENSIONS)
 518       extension_event_router_forwarder_(extension_event_router_forwarder),
 519 #endif
 520       globals_(NULL),
 521       is_spdy_disabled_by_policy_(false),
 522       is_quic_allowed_by_policy_(true),
 523       creation_time_(base::TimeTicks::Now()),
 524       weak_factory_(this) {
 525   auth_schemes_ = local_state->GetString(prefs::kAuthSchemes);
 526   negotiate_disable_cname_lookup_ = local_state->GetBoolean(
 527       prefs::kDisableAuthNegotiateCnameLookup);
 528   negotiate_enable_port_ = local_state->GetBoolean(
 529       prefs::kEnableAuthNegotiatePort);
 530   auth_server_whitelist_ = local_state->GetString(prefs::kAuthServerWhitelist);
 531   auth_delegate_whitelist_ = local_state->GetString(
 532       prefs::kAuthNegotiateDelegateWhitelist);
 533   gssapi_library_name_ = local_state->GetString(prefs::kGSSAPILibraryName);
 534   pref_proxy_config_tracker_.reset(
 535       ProxyServiceFactory::CreatePrefProxyConfigTrackerOfLocalState(
 536           local_state));
 537   ChromeNetworkDelegate::InitializePrefsOnUIThread(
 538       &system_enable_referrers_,
 539       NULL,
 540       NULL,
 541       NULL,
 542       local_state);
 543   ssl_config_service_manager_.reset(
 544       SSLConfigServiceManager::CreateDefaultManager(local_state));
 545
 546   base::Value* dns_client_enabled_default = new base::FundamentalValue(
 547       chrome_browser_net::ConfigureAsyncDnsFieldTrial());
 548   local_state->SetDefaultPrefValue(prefs::kBuiltInDnsClientEnabled,
 549                                    dns_client_enabled_default);
 550   chrome_browser_net::LogAsyncDnsPrefSource(
 551       local_state->FindPreference(prefs::kBuiltInDnsClientEnabled));
 552
 553   dns_client_enabled_.Init(prefs::kBuiltInDnsClientEnabled,
 554                            local_state,
 555                            base::Bind(&IOThread::UpdateDnsClientEnabled,
 556                                       base::Unretained(this)));
 557   dns_client_enabled_.MoveToThread(
 558       BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO));
 559
 560   quick_check_enabled_.Init(prefs::kQuickCheckEnabled,
 561                             local_state);
 562   quick_check_enabled_.MoveToThread(
 563       BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO));
 564
 565 #if defined(ENABLE_CONFIGURATION_POLICY)
 566   is_spdy_disabled_by_policy_ = policy_service->GetPolicies(
 567       policy::PolicyNamespace(policy::POLICY_DOMAIN_CHROME, std::string())).Get(
 568           policy::key::kDisableSpdy) != NULL;
 569
 570   const base::Value* value = policy_service->GetPolicies(
 571       policy::PolicyNamespace(policy::POLICY_DOMAIN_CHROME,
 572       std::string())).GetValue(policy::key::kQuicAllowed);
 573   if (value)
 574     value->GetAsBoolean(&is_quic_allowed_by_policy_);
 575 #endif  // ENABLE_CONFIGURATION_POLICY
 576
 577   BrowserThread::SetDelegate(BrowserThread::IO, this);
 578 }
 579
 580 IOThread::~IOThread() {
 581   // This isn't needed for production code, but in tests, IOThread may
 582   // be multiply constructed.
 583   BrowserThread::SetDelegate(BrowserThread::IO, NULL);
 584
 585   pref_proxy_config_tracker_->DetachFromPrefService();
 586   DCHECK(!globals_);
 587 }
 588
 589 IOThread::Globals* IOThread::globals() {
 590   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 591   return globals_;
 592 }
 593
 594 void IOThread::SetGlobalsForTesting(Globals* globals) {
 595   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 596   DCHECK(!globals || !globals_);
 597   globals_ = globals;
 598 }
 599
 600 ChromeNetLog* IOThread::net_log() {
 601   return net_log_;
 602 }
 603
 604 void IOThread::ChangedToOnTheRecord() {
 605   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 606   BrowserThread::PostTask(
 607       BrowserThread::IO,
 608       FROM_HERE,
 609       base::Bind(&IOThread::ChangedToOnTheRecordOnIOThread,
 610                  base::Unretained(this)));
 611 }
 612
 613 net::URLRequestContextGetter* IOThread::system_url_request_context_getter() {
 614   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 615   if (!system_url_request_context_getter_.get()) {
 616     InitSystemRequestContext();
 617   }
 618   return system_url_request_context_getter_.get();
 619 }
 620
 621 void IOThread::Init() {
 622   // Prefer to use InitAsync unless you need initialization to block
 623   // the UI thread
 624 }
 625
 626 void IOThread::InitAsync() {
 627   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 628   // is fixed.
 629   tracked_objects::ScopedTracker tracking_profile1(
 630       FROM_HERE_WITH_EXPLICIT_FUNCTION("466432 IOThread::InitAsync::Start"));
 631   TRACE_EVENT0("startup", "IOThread::InitAsync");
 632   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 633
 634 #if defined(USE_NSS_CERTS) || defined(OS_IOS)
 635   net::SetMessageLoopForNSSHttpIO();
 636 #endif
 637
 638   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 639   // is fixed.
 640   tracked_objects::ScopedTracker tracking_profile2(
 641       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 642           "466432 IOThread::InitAsync::CommandLineForCurrentProcess"));
 643   const base::CommandLine& command_line =
 644       *base::CommandLine::ForCurrentProcess();
 645
 646   DCHECK(!globals_);
 647   globals_ = new Globals;
 648
 649   // Add an observer that will emit network change events to the ChromeNetLog.
 650   // Assuming NetworkChangeNotifier dispatches in FIFO order, we should be
 651   // logging the network change before other IO thread consumers respond to it.
 652   network_change_observer_.reset(
 653       new LoggingNetworkChangeObserver(net_log_));
 654
 655   // Setup the HistogramWatcher to run on the IO thread.
 656   net::NetworkChangeNotifier::InitHistogramWatcher();
 657
 658 #if defined(ENABLE_EXTENSIONS)
 659   globals_->extension_event_router_forwarder =
 660       extension_event_router_forwarder_;
 661 #endif
 662
 663   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 664   // is fixed.
 665   tracked_objects::ScopedTracker tracking_profile3(
 666       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 667           "466432 IOThread::InitAsync::ChromeNetworkDelegate"));
 668   scoped_ptr<ChromeNetworkDelegate> chrome_network_delegate(
 669       new ChromeNetworkDelegate(extension_event_router_forwarder(),
 670                                 &system_enable_referrers_));
 671
 672 #if defined(ENABLE_EXTENSIONS)
 673   if (command_line.HasSwitch(switches::kDisableExtensionsHttpThrottling))
 674     chrome_network_delegate->NeverThrottleRequests();
 675 #endif
 676
 677   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 678   // is fixed.
 679   tracked_objects::ScopedTracker tracking_profile4(
 680       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 681           "466432 IOThread::InitAsync::CreateGlobalHostResolver"));
 682   globals_->system_network_delegate = chrome_network_delegate.Pass();
 683   globals_->host_resolver = CreateGlobalHostResolver(net_log_);
 684   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 685   // is fixed.
 686   tracked_objects::ScopedTracker tracking_profile5(
 687       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 688           "466432 IOThread::InitAsync::UpdateDnsClientEnabled::Start"));
 689   UpdateDnsClientEnabled();
 690   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 691   // is fixed.
 692   tracked_objects::ScopedTracker tracking_profile6(
 693       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 694           "466432 IOThread::InitAsync::UpdateDnsClientEnabled::End"));
 695 #if defined(OS_CHROMEOS)
 696   // Creates a CertVerifyProc that doesn't allow any profile-provided certs.
 697   globals_->cert_verifier.reset(new net::MultiThreadedCertVerifier(
 698       new chromeos::CertVerifyProcChromeOS()));
 699 #else
 700   globals_->cert_verifier.reset(new net::MultiThreadedCertVerifier(
 701       net::CertVerifyProc::CreateDefault()));
 702 #endif
 703
 704   globals_->transport_security_state.reset(new net::TransportSecurityState());
 705
 706   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 707   // is fixed.
 708   tracked_objects::ScopedTracker tracking_profile7(
 709       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 710           "466432 IOThread::InitAsync::CreateMultiLogVerifier"));
 711   net::MultiLogCTVerifier* ct_verifier = new net::MultiLogCTVerifier();
 712   globals_->cert_transparency_verifier.reset(ct_verifier);
 713
 714   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 715   // is fixed.
 716   tracked_objects::ScopedTracker tracking_profile8(
 717       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 718           "466432 IOThread::InitAsync::CreateLogVerifiers::Start"));
 719   // Add built-in logs
 720   ct_verifier->AddLogs(net::ct::CreateLogVerifiersForKnownLogs());
 721   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 722   // is fixed.
 723   tracked_objects::ScopedTracker tracking_profile9(
 724       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 725           "466432 IOThread::InitAsync::CreateLogVerifiers::End"));
 726
 727   // Add logs from command line
 728   if (command_line.HasSwitch(switches::kCertificateTransparencyLog)) {
 729     std::string switch_value = command_line.GetSwitchValueASCII(
 730         switches::kCertificateTransparencyLog);
 731     std::vector<std::string> logs;
 732     base::SplitString(switch_value, ',', &logs);
 733     for (std::vector<std::string>::iterator it = logs.begin(); it != logs.end();
 734          ++it) {
 735       const std::string& curr_log = *it;
 736       size_t delim_pos = curr_log.find(":");
 737       CHECK(delim_pos != std::string::npos)
 738           << "CT log description not provided (switch format"
 739              " is 'description:base64_key')";
 740       std::string log_description(curr_log.substr(0, delim_pos));
 741       std::string ct_public_key_data;
 742       CHECK(base::Base64Decode(curr_log.substr(delim_pos + 1),
 743                                &ct_public_key_data))
 744           << "Unable to decode CT public key.";
 745       scoped_ptr<net::CTLogVerifier> external_log_verifier(
 746           net::CTLogVerifier::Create(ct_public_key_data, log_description));
 747       CHECK(external_log_verifier) << "Unable to parse CT public key.";
 748       VLOG(1) << "Adding log with description " << log_description;
 749       ct_verifier->AddLog(external_log_verifier.Pass());
 750     }
 751   }
 752
 753   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 754   // is fixed.
 755   tracked_objects::ScopedTracker tracking_profile10(
 756       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 757           "466432 IOThread::InitAsync::CertPolicyEnforcer"));
 758   net::CertPolicyEnforcer* policy_enforcer = NULL;
 759   policy_enforcer = new net::CertPolicyEnforcer(
 760       IsCertificateTransparencyRequiredForEV(command_line));
 761   globals_->cert_policy_enforcer.reset(policy_enforcer);
 762
 763   globals_->ssl_config_service = GetSSLConfigService();
 764
 765   globals_->http_auth_handler_factory.reset(CreateDefaultAuthHandlerFactory(
 766       globals_->host_resolver.get()));
 767   globals_->http_server_properties.reset(new net::HttpServerPropertiesImpl());
 768   // For the ProxyScriptFetcher, we use a direct ProxyService.
 769   globals_->proxy_script_fetcher_proxy_service.reset(
 770       net::ProxyService::CreateDirectWithNetLog(net_log_));
 771   // In-memory cookie store.
 772   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 773   // is fixed.
 774   tracked_objects::ScopedTracker tracking_profile11(
 775       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 776           "466432 IOThread::InitAsync::CreateCookieStore::Start"));
 777   globals_->system_cookie_store =
 778         content::CreateCookieStore(content::CookieStoreConfig());
 779   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 780   // is fixed.
 781   tracked_objects::ScopedTracker tracking_profile12(
 782       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 783           "466432 IOThread::InitAsync::CreateCookieStore::End"));
 784   // In-memory channel ID store.
 785   globals_->system_channel_id_service.reset(
 786       new net::ChannelIDService(
 787           new net::DefaultChannelIDStore(NULL),
 788           base::WorkerPool::GetTaskRunner(true)));
 789   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 790   // is fixed.
 791   tracked_objects::ScopedTracker tracking_profile12_1(
 792       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 793           "466432 IOThread::InitAsync::CreateDnsProbeService"));
 794   globals_->dns_probe_service.reset(new chrome_browser_net::DnsProbeService());
 795   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 796   // is fixed.
 797   tracked_objects::ScopedTracker tracking_profile12_2(
 798       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 799           "466432 IOThread::InitAsync::CreateHostMappingRules"));
 800   globals_->host_mapping_rules.reset(new net::HostMappingRules());
 801   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 802   // is fixed.
 803   tracked_objects::ScopedTracker tracking_profile12_3(
 804       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 805           "466432 IOThread::InitAsync::CreateHTTPUserAgentSettings"));
 806   globals_->http_user_agent_settings.reset(
 807       new net::StaticHttpUserAgentSettings(std::string(), GetUserAgent()));
 808   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 809   // is fixed.
 810   tracked_objects::ScopedTracker tracking_profile12_4(
 811       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 812           "466432 IOThread::InitAsync::CommandLineConfiguration"));
 813   if (command_line.HasSwitch(switches::kHostRules)) {
 814     TRACE_EVENT_BEGIN0("startup", "IOThread::InitAsync:SetRulesFromString");
 815     globals_->host_mapping_rules->SetRulesFromString(
 816         command_line.GetSwitchValueASCII(switches::kHostRules));
 817     TRACE_EVENT_END0("startup", "IOThread::InitAsync:SetRulesFromString");
 818   }
 819   if (command_line.HasSwitch(switches::kIgnoreCertificateErrors))
 820     globals_->ignore_certificate_errors = true;
 821   globals_->use_stale_while_revalidate =
 822       IsStaleWhileRevalidateEnabled(command_line);
 823   if (command_line.HasSwitch(switches::kTestingFixedHttpPort)) {
 824     globals_->testing_fixed_http_port =
 825         GetSwitchValueAsInt(command_line, switches::kTestingFixedHttpPort);
 826   }
 827   if (command_line.HasSwitch(switches::kTestingFixedHttpsPort)) {
 828     globals_->testing_fixed_https_port =
 829         GetSwitchValueAsInt(command_line, switches::kTestingFixedHttpsPort);
 830   }
 831   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 832   // is fixed.
 833   tracked_objects::ScopedTracker tracking_profile12_5(
 834       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 835           "466432 IOThread::InitAsync::QuicConfiguration"));
 836   ConfigureQuic(command_line);
 837   if (command_line.HasSwitch(
 838           switches::kEnableUserAlternateProtocolPorts)) {
 839     globals_->enable_user_alternate_protocol_ports = true;
 840   }
 841   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 842   // is fixed.
 843   tracked_objects::ScopedTracker tracking_profile13(
 844       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 845           "466432 IOThread::InitAsync::InitializeNetworkOptions"));
 846   InitializeNetworkOptions(command_line);
 847
 848   net::HttpNetworkSession::Params session_params;
 849   InitializeNetworkSessionParams(&session_params);
 850   session_params.net_log = net_log_;
 851   session_params.proxy_service =
 852       globals_->proxy_script_fetcher_proxy_service.get();
 853
 854   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 855   // is fixed.
 856   tracked_objects::ScopedTracker tracking_profile14(
 857       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 858           "466432 IOThread::InitAsync::HttpNetorkSession::Start"));
 859   TRACE_EVENT_BEGIN0("startup", "IOThread::InitAsync:HttpNetworkSession");
 860   scoped_refptr<net::HttpNetworkSession> network_session(
 861       new net::HttpNetworkSession(session_params));
 862   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 863   // is fixed.
 864   tracked_objects::ScopedTracker tracking_profile15(
 865       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 866           "466432 IOThread::InitAsync::HttpNetorkSession::End"));
 867   globals_->proxy_script_fetcher_http_transaction_factory
 868       .reset(new net::HttpNetworkLayer(network_session.get()));
 869   TRACE_EVENT_END0("startup", "IOThread::InitAsync:HttpNetworkSession");
 870   scoped_ptr<net::URLRequestJobFactoryImpl> job_factory(
 871       new net::URLRequestJobFactoryImpl());
 872
 873   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 874   // is fixed.
 875   tracked_objects::ScopedTracker tracking_profile16(
 876       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 877           "466432 IOThread::InitAsync::SetProtocolHandler"));
 878   job_factory->SetProtocolHandler(url::kDataScheme,
 879                                   new net::DataProtocolHandler());
 880   job_factory->SetProtocolHandler(
 881       url::kFileScheme,
 882       new net::FileProtocolHandler(
 883           content::BrowserThread::GetBlockingPool()->
 884               GetTaskRunnerWithShutdownBehavior(
 885                   base::SequencedWorkerPool::SKIP_ON_SHUTDOWN)));
 886 #if !defined(DISABLE_FTP_SUPPORT)
 887   globals_->proxy_script_fetcher_ftp_transaction_factory.reset(
 888       new net::FtpNetworkLayer(globals_->host_resolver.get()));
 889   job_factory->SetProtocolHandler(
 890       url::kFtpScheme,
 891       new net::FtpProtocolHandler(
 892           globals_->proxy_script_fetcher_ftp_transaction_factory.get()));
 893 #endif
 894   globals_->proxy_script_fetcher_url_request_job_factory = job_factory.Pass();
 895
 896   globals_->throttler_manager.reset(new net::URLRequestThrottlerManager());
 897   globals_->throttler_manager->set_net_log(net_log_);
 898   // Always done in production, disabled only for unit tests.
 899   globals_->throttler_manager->set_enable_thread_checks(true);
 900
 901   globals_->proxy_script_fetcher_context.reset(
 902       ConstructProxyScriptFetcherContext(globals_, net_log_));
 903
 904 #if defined(OS_MACOSX) && !defined(OS_IOS)
 905   // Start observing Keychain events. This needs to be done on the UI thread,
 906   // as Keychain services requires a CFRunLoop.
 907   BrowserThread::PostTask(BrowserThread::UI,
 908                           FROM_HERE,
 909                           base::Bind(&ObserveKeychainEvents));
 910 #endif
 911
 912   // InitSystemRequestContext turns right around and posts a task back
 913   // to the IO thread, so we can't let it run until we know the IO
 914   // thread has started.
 915   //
 916   // Note that since we are at BrowserThread::Init time, the UI thread
 917   // is blocked waiting for the thread to start.  Therefore, posting
 918   // this task to the main thread's message loop here is guaranteed to
 919   // get it onto the message loop while the IOThread object still
 920   // exists.  However, the message might not be processed on the UI
 921   // thread until after IOThread is gone, so use a weak pointer.
 922   BrowserThread::PostTask(BrowserThread::UI,
 923                           FROM_HERE,
 924                           base::Bind(&IOThread::InitSystemRequestContext,
 925                                      weak_factory_.GetWeakPtr()));
 926 }
 927
 928 void IOThread::CleanUp() {
 929   base::debug::LeakTracker<SafeBrowsingURLRequestContext>::CheckForLeaks();
 930
 931 #if defined(USE_NSS_CERTS) || defined(OS_IOS)
 932   net::ShutdownNSSHttpIO();
 933 #endif
 934
 935   system_url_request_context_getter_ = NULL;
 936
 937   // Release objects that the net::URLRequestContext could have been pointing
 938   // to.
 939
 940   // Shutdown the HistogramWatcher on the IO thread.
 941   net::NetworkChangeNotifier::ShutdownHistogramWatcher();
 942
 943   // This must be reset before the ChromeNetLog is destroyed.
 944   network_change_observer_.reset();
 945
 946   system_proxy_config_service_.reset();
 947
 948   delete globals_;
 949   globals_ = NULL;
 950
 951   base::debug::LeakTracker<SystemURLRequestContextGetter>::CheckForLeaks();
 952 }
 953
 954 void IOThread::InitializeNetworkOptions(const base::CommandLine& command_line) {
 955   // Only handle use-spdy command line flags if "spdy.disabled" preference is
 956   // not disabled via policy.
 957   if (is_spdy_disabled_by_policy_) {
 958     base::FieldTrial* trial = base::FieldTrialList::Find(kSpdyFieldTrialName);
 959     if (trial)
 960       trial->Disable();
 961   } else {
 962     std::string group = base::FieldTrialList::FindFullName(kSpdyFieldTrialName);
 963     VariationParameters params;
 964     if (!variations::GetVariationParams(kSpdyFieldTrialName, &params)) {
 965       params.clear();
 966     }
 967     ConfigureSpdyGlobals(command_line, group, params, globals_);
 968   }
 969
 970   ConfigureTCPFastOpen(command_line);
 971   ConfigureSdch();
 972
 973   // TODO(rch): Make the client socket factory a per-network session
 974   // instance, constructed from a NetworkSession::Params, to allow us
 975   // to move this option to IOThread::Globals &
 976   // HttpNetworkSession::Params.
 977 }
 978
 979 void IOThread::ConfigureTCPFastOpen(const base::CommandLine& command_line) {
 980   const std::string trial_group =
 981       base::FieldTrialList::FindFullName(kTCPFastOpenFieldTrialName);
 982   if (trial_group == kTCPFastOpenHttpsEnabledGroupName)
 983     globals_->enable_tcp_fast_open_for_ssl.set(true);
 984   bool always_enable_if_supported =
 985       command_line.HasSwitch(switches::kEnableTcpFastOpen);
 986   // Check for OS support of TCP FastOpen, and turn it on for all connections
 987   // if indicated by user.
 988   net::CheckSupportAndMaybeEnableTCPFastOpen(always_enable_if_supported);
 989 }
 990
 991 void IOThread::ConfigureSdch() {
 992   // Check SDCH field trial.  Default is now that everything is enabled,
 993   // so provide options for disabling HTTPS or all of SDCH.
 994   const char kSdchFieldTrialName[] = "SDCH";
 995   const char kEnabledHttpOnlyGroupName[] = "EnabledHttpOnly";
 996   const char kDisabledAllGroupName[] = "DisabledAll";
 997
 998   // Store in a string on return to keep underlying storage for
 999   // StringPiece stable.
1000   std::string sdch_trial_group_string =
1001       base::FieldTrialList::FindFullName(kSdchFieldTrialName);
1002   base::StringPiece sdch_trial_group(sdch_trial_group_string);
1003   if (sdch_trial_group.starts_with(kEnabledHttpOnlyGroupName)) {
1004     net::SdchManager::EnableSdchSupport(true);
1005     net::SdchManager::EnableSecureSchemeSupport(false);
1006   } else if (sdch_trial_group.starts_with(kDisabledAllGroupName)) {
1007     net::SdchManager::EnableSdchSupport(false);
1008   }
1009 }
1010
1011 // static
1012 void IOThread::ConfigureSpdyGlobals(
1013     const base::CommandLine& command_line,
1014     base::StringPiece spdy_trial_group,
1015     const VariationParameters& spdy_trial_params,
1016     IOThread::Globals* globals) {
1017   if (command_line.HasSwitch(switches::kTrustedSpdyProxy)) {
1018     globals->trusted_spdy_proxy.set(
1019         command_line.GetSwitchValueASCII(switches::kTrustedSpdyProxy));
1020   }
1021   if (command_line.HasSwitch(switches::kIgnoreUrlFetcherCertRequests))
1022     net::URLFetcher::SetIgnoreCertificateRequests(true);
1023
1024   if (command_line.HasSwitch(switches::kUseSpdy)) {
1025     std::string spdy_mode =
1026         command_line.GetSwitchValueASCII(switches::kUseSpdy);
1027     ConfigureSpdyGlobalsFromUseSpdyArgument(spdy_mode, globals);
1028     return;
1029   }
1030
1031   globals->next_protos.clear();
1032   globals->next_protos.push_back(net::kProtoHTTP11);
1033   bool enable_quic = false;
1034   globals->enable_quic.CopyToIfSet(&enable_quic);
1035   if (enable_quic) {
1036     globals->next_protos.push_back(net::kProtoQUIC1SPDY3);
1037   }
1038
1039   if (command_line.HasSwitch(switches::kEnableSpdy4)) {
1040     globals->next_protos.push_back(net::kProtoSPDY31);
1041     globals->next_protos.push_back(net::kProtoSPDY4_14);
1042     globals->next_protos.push_back(net::kProtoSPDY4);
1043     globals->use_alternate_protocols.set(true);
1044     return;
1045   }
1046   if (command_line.HasSwitch(switches::kEnableNpnHttpOnly)) {
1047     globals->use_alternate_protocols.set(false);
1048     return;
1049   }
1050
1051   // No SPDY command-line flags have been specified. Examine trial groups.
1052   if (spdy_trial_group.starts_with(kSpdyFieldTrialHoldbackGroupNamePrefix)) {
1053     net::HttpStreamFactory::set_spdy_enabled(false);
1054     return;
1055   }
1056   if (spdy_trial_group.starts_with(kSpdyFieldTrialSpdy31GroupNamePrefix)) {
1057     globals->next_protos.push_back(net::kProtoSPDY31);
1058     globals->use_alternate_protocols.set(true);
1059     return;
1060   }
1061   if (spdy_trial_group.starts_with(kSpdyFieldTrialSpdy4GroupNamePrefix)) {
1062     globals->next_protos.push_back(net::kProtoSPDY31);
1063     globals->next_protos.push_back(net::kProtoSPDY4_14);
1064     globals->next_protos.push_back(net::kProtoSPDY4);
1065     globals->use_alternate_protocols.set(true);
1066     return;
1067   }
1068   if (spdy_trial_group.starts_with(kSpdyFieldTrialParametrizedPrefix)) {
1069     bool spdy_enabled = false;
1070     if (LowerCaseEqualsASCII(
1071             GetVariationParam(spdy_trial_params, "enable_spdy31"), "true")) {
1072       globals->next_protos.push_back(net::kProtoSPDY31);
1073       spdy_enabled = true;
1074     }
1075     if (LowerCaseEqualsASCII(
1076             GetVariationParam(spdy_trial_params, "enable_http2_14"), "true")) {
1077       globals->next_protos.push_back(net::kProtoSPDY4_14);
1078       spdy_enabled = true;
1079     }
1080     if (LowerCaseEqualsASCII(
1081             GetVariationParam(spdy_trial_params, "enable_http2"), "true")) {
1082       globals->next_protos.push_back(net::kProtoSPDY4);
1083       spdy_enabled = true;
1084     }
1085     // TODO(bnc): HttpStreamFactory::spdy_enabled_ is redundant with
1086     // globals->next_protos, can it be eliminated?
1087     net::HttpStreamFactory::set_spdy_enabled(spdy_enabled);
1088     globals->use_alternate_protocols.set(true);
1089     return;
1090   }
1091
1092   // By default, enable HTTP/2.
1093   globals->next_protos.push_back(net::kProtoSPDY31);
1094   globals->next_protos.push_back(net::kProtoSPDY4_14);
1095   globals->next_protos.push_back(net::kProtoSPDY4);
1096   globals->use_alternate_protocols.set(true);
1097 }
1098
1099 // static
1100 void IOThread::RegisterPrefs(PrefRegistrySimple* registry) {
1101   registry->RegisterStringPref(prefs::kAuthSchemes,
1102                                "basic,digest,ntlm,negotiate,"
1103                                "spdyproxy");
1104   registry->RegisterBooleanPref(prefs::kDisableAuthNegotiateCnameLookup, false);
1105   registry->RegisterBooleanPref(prefs::kEnableAuthNegotiatePort, false);
1106   registry->RegisterStringPref(prefs::kAuthServerWhitelist, std::string());
1107   registry->RegisterStringPref(prefs::kAuthNegotiateDelegateWhitelist,
1108                                std::string());
1109   registry->RegisterStringPref(prefs::kGSSAPILibraryName, std::string());
1110   registry->RegisterStringPref(
1111       data_reduction_proxy::prefs::kDataReductionProxy, std::string());
1112   registry->RegisterBooleanPref(prefs::kEnableReferrers, true);
1113   data_reduction_proxy::RegisterPrefs(registry);
1114   registry->RegisterBooleanPref(prefs::kBuiltInDnsClientEnabled, true);
1115   registry->RegisterBooleanPref(prefs::kQuickCheckEnabled, true);
1116 }
1117
1118 net::HttpAuthHandlerFactory* IOThread::CreateDefaultAuthHandlerFactory(
1119     net::HostResolver* resolver) {
1120   net::HttpAuthFilterWhitelist* auth_filter_default_credentials = NULL;
1121   if (!auth_server_whitelist_.empty()) {
1122     auth_filter_default_credentials =
1123         new net::HttpAuthFilterWhitelist(auth_server_whitelist_);
1124   }
1125   net::HttpAuthFilterWhitelist* auth_filter_delegate = NULL;
1126   if (!auth_delegate_whitelist_.empty()) {
1127     auth_filter_delegate =
1128         new net::HttpAuthFilterWhitelist(auth_delegate_whitelist_);
1129   }
1130   globals_->url_security_manager.reset(
1131       net::URLSecurityManager::Create(auth_filter_default_credentials,
1132                                       auth_filter_delegate));
1133   std::vector<std::string> supported_schemes;
1134   base::SplitString(auth_schemes_, ',', &supported_schemes);
1135
1136   scoped_ptr<net::HttpAuthHandlerRegistryFactory> registry_factory(
1137       net::HttpAuthHandlerRegistryFactory::Create(
1138           supported_schemes, globals_->url_security_manager.get(),
1139           resolver, gssapi_library_name_, negotiate_disable_cname_lookup_,
1140           negotiate_enable_port_));
1141   return registry_factory.release();
1142 }
1143
1144 void IOThread::ClearHostCache() {
1145   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
1146
1147   net::HostCache* host_cache = globals_->host_resolver->GetHostCache();
1148   if (host_cache)
1149     host_cache->clear();
1150 }
1151
1152 void IOThread::InitializeNetworkSessionParams(
1153     net::HttpNetworkSession::Params* params) {
1154   InitializeNetworkSessionParamsFromGlobals(*globals_, params);
1155 }
1156
1157 // static
1158 void IOThread::InitializeNetworkSessionParamsFromGlobals(
1159     const IOThread::Globals& globals,
1160     net::HttpNetworkSession::Params* params) {
1161   params->host_resolver = globals.host_resolver.get();
1162   params->cert_verifier = globals.cert_verifier.get();
1163   params->cert_policy_enforcer = globals.cert_policy_enforcer.get();
1164   params->channel_id_service = globals.system_channel_id_service.get();
1165   params->transport_security_state = globals.transport_security_state.get();
1166   params->ssl_config_service = globals.ssl_config_service.get();
1167   params->http_auth_handler_factory = globals.http_auth_handler_factory.get();
1168   params->http_server_properties =
1169       globals.http_server_properties->GetWeakPtr();
1170   params->network_delegate = globals.system_network_delegate.get();
1171   params->host_mapping_rules = globals.host_mapping_rules.get();
1172   params->ignore_certificate_errors = globals.ignore_certificate_errors;
1173   params->use_stale_while_revalidate = globals.use_stale_while_revalidate;
1174   params->testing_fixed_http_port = globals.testing_fixed_http_port;
1175   params->testing_fixed_https_port = globals.testing_fixed_https_port;
1176   globals.enable_tcp_fast_open_for_ssl.CopyToIfSet(
1177       &params->enable_tcp_fast_open_for_ssl);
1178
1179   globals.initial_max_spdy_concurrent_streams.CopyToIfSet(
1180       &params->spdy_initial_max_concurrent_streams);
1181   globals.enable_spdy_compression.CopyToIfSet(
1182       &params->enable_spdy_compression);
1183   globals.enable_spdy_ping_based_connection_checking.CopyToIfSet(
1184       &params->enable_spdy_ping_based_connection_checking);
1185   globals.spdy_default_protocol.CopyToIfSet(
1186       &params->spdy_default_protocol);
1187   params->next_protos = globals.next_protos;
1188   globals.trusted_spdy_proxy.CopyToIfSet(&params->trusted_spdy_proxy);
1189   params->forced_spdy_exclusions = globals.forced_spdy_exclusions;
1190   globals.use_alternate_protocols.CopyToIfSet(
1191       &params->use_alternate_protocols);
1192   globals.alternative_service_probability_threshold.CopyToIfSet(
1193       &params->alternative_service_probability_threshold);
1194
1195   globals.enable_quic.CopyToIfSet(&params->enable_quic);
1196   globals.enable_quic_for_proxies.CopyToIfSet(&params->enable_quic_for_proxies);
1197   globals.quic_always_require_handshake_confirmation.CopyToIfSet(
1198       &params->quic_always_require_handshake_confirmation);
1199   globals.quic_disable_connection_pooling.CopyToIfSet(
1200       &params->quic_disable_connection_pooling);
1201   globals.quic_load_server_info_timeout_srtt_multiplier.CopyToIfSet(
1202       &params->quic_load_server_info_timeout_srtt_multiplier);
1203   globals.quic_enable_connection_racing.CopyToIfSet(
1204       &params->quic_enable_connection_racing);
1205   globals.quic_enable_non_blocking_io.CopyToIfSet(
1206       &params->quic_enable_non_blocking_io);
1207   globals.quic_disable_disk_cache.CopyToIfSet(
1208       &params->quic_disable_disk_cache);
1209   globals.quic_max_number_of_lossy_connections.CopyToIfSet(
1210       &params->quic_max_number_of_lossy_connections);
1211   globals.quic_packet_loss_threshold.CopyToIfSet(
1212       &params->quic_packet_loss_threshold);
1213   globals.quic_socket_receive_buffer_size.CopyToIfSet(
1214       &params->quic_socket_receive_buffer_size);
1215   globals.enable_quic_port_selection.CopyToIfSet(
1216       &params->enable_quic_port_selection);
1217   globals.quic_max_packet_length.CopyToIfSet(&params->quic_max_packet_length);
1218   globals.quic_user_agent_id.CopyToIfSet(&params->quic_user_agent_id);
1219   globals.quic_supported_versions.CopyToIfSet(
1220       &params->quic_supported_versions);
1221   params->quic_connection_options = globals.quic_connection_options;
1222
1223   globals.origin_to_force_quic_on.CopyToIfSet(
1224       &params->origin_to_force_quic_on);
1225   params->enable_user_alternate_protocol_ports =
1226       globals.enable_user_alternate_protocol_ports;
1227 }
1228
1229 base::TimeTicks IOThread::creation_time() const {
1230   return creation_time_;
1231 }
1232
1233 net::SSLConfigService* IOThread::GetSSLConfigService() {
1234   return ssl_config_service_manager_->Get();
1235 }
1236
1237 void IOThread::ChangedToOnTheRecordOnIOThread() {
1238   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
1239
1240   // Clear the host cache to avoid showing entries from the OTR session
1241   // in about:net-internals.
1242   ClearHostCache();
1243 }
1244
1245 void IOThread::InitSystemRequestContext() {
1246   if (system_url_request_context_getter_.get())
1247     return;
1248   // If we're in unit_tests, IOThread may not be run.
1249   if (!BrowserThread::IsMessageLoopValid(BrowserThread::IO))
1250     return;
1251   system_proxy_config_service_.reset(
1252       ProxyServiceFactory::CreateProxyConfigService(
1253           pref_proxy_config_tracker_.get()));
1254   system_url_request_context_getter_ =
1255       new SystemURLRequestContextGetter(this);
1256   // Safe to post an unretained this pointer, since IOThread is
1257   // guaranteed to outlive the IO BrowserThread.
1258   BrowserThread::PostTask(
1259       BrowserThread::IO,
1260       FROM_HERE,
1261       base::Bind(&IOThread::InitSystemRequestContextOnIOThread,
1262                  base::Unretained(this)));
1263 }
1264
1265 void IOThread::InitSystemRequestContextOnIOThread() {
1266   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
1267   DCHECK(!globals_->system_proxy_service.get());
1268   DCHECK(system_proxy_config_service_.get());
1269
1270   const base::CommandLine& command_line =
1271       *base::CommandLine::ForCurrentProcess();
1272   globals_->system_proxy_service.reset(
1273       ProxyServiceFactory::CreateProxyService(
1274           net_log_,
1275           globals_->proxy_script_fetcher_context.get(),
1276           globals_->system_network_delegate.get(),
1277           system_proxy_config_service_.release(),
1278           command_line,
1279           quick_check_enabled_.GetValue()));
1280
1281   net::HttpNetworkSession::Params system_params;
1282   InitializeNetworkSessionParams(&system_params);
1283   system_params.net_log = net_log_;
1284   system_params.proxy_service = globals_->system_proxy_service.get();
1285
1286   globals_->system_http_transaction_factory.reset(
1287       new net::HttpNetworkLayer(
1288           new net::HttpNetworkSession(system_params)));
1289   globals_->system_url_request_job_factory.reset(
1290       new net::URLRequestJobFactoryImpl());
1291   globals_->system_request_context.reset(
1292       ConstructSystemRequestContext(globals_, net_log_));
1293   globals_->system_request_context->set_ssl_config_service(
1294       globals_->ssl_config_service.get());
1295   globals_->system_request_context->set_http_server_properties(
1296       globals_->http_server_properties->GetWeakPtr());
1297 }
1298
1299 void IOThread::UpdateDnsClientEnabled() {
1300   globals()->host_resolver->SetDnsClientEnabled(*dns_client_enabled_);
1301 }
1302
1303 void IOThread::ConfigureQuic(const base::CommandLine& command_line) {
1304   // Always fetch the field trial group to ensure it is reported correctly.
1305   // The command line flags will be associated with a group that is reported
1306   // so long as trial is actually queried.
1307   std::string group =
1308       base::FieldTrialList::FindFullName(kQuicFieldTrialName);
1309   VariationParameters params;
1310   if (!variations::GetVariationParams(kQuicFieldTrialName, &params)) {
1311     params.clear();
1312   }
1313
1314   ConfigureQuicGlobals(command_line, group, params, is_quic_allowed_by_policy_,
1315                        globals_);
1316 }
1317
1318 // static
1319 void IOThread::ConfigureQuicGlobals(
1320     const base::CommandLine& command_line,
1321     base::StringPiece quic_trial_group,
1322     const VariationParameters& quic_trial_params,
1323     bool quic_allowed_by_policy,
1324     IOThread::Globals* globals) {
1325   bool enable_quic = ShouldEnableQuic(command_line, quic_trial_group,
1326                                       quic_allowed_by_policy);
1327   globals->enable_quic.set(enable_quic);
1328   bool enable_quic_for_proxies = ShouldEnableQuicForProxies(
1329       command_line, quic_trial_group, quic_allowed_by_policy);
1330   globals->enable_quic_for_proxies.set(enable_quic_for_proxies);
1331   if (enable_quic) {
1332     globals->quic_always_require_handshake_confirmation.set(
1333         ShouldQuicAlwaysRequireHandshakeConfirmation(quic_trial_params));
1334     globals->quic_disable_connection_pooling.set(
1335         ShouldQuicDisableConnectionPooling(quic_trial_params));
1336     int receive_buffer_size = GetQuicSocketReceiveBufferSize(quic_trial_params);
1337     if (receive_buffer_size != 0) {
1338       globals->quic_socket_receive_buffer_size.set(receive_buffer_size);
1339     }
1340     float load_server_info_timeout_srtt_multiplier =
1341         GetQuicLoadServerInfoTimeoutSrttMultiplier(quic_trial_params);
1342     if (load_server_info_timeout_srtt_multiplier != 0) {
1343       globals->quic_load_server_info_timeout_srtt_multiplier.set(
1344           load_server_info_timeout_srtt_multiplier);
1345     }
1346     globals->quic_enable_connection_racing.set(
1347         ShouldQuicEnableConnectionRacing(quic_trial_params));
1348     globals->quic_enable_non_blocking_io.set(
1349         ShouldQuicEnableNonBlockingIO(quic_trial_params));
1350     globals->quic_disable_disk_cache.set(
1351         ShouldQuicDisableDiskCache(quic_trial_params));
1352     int max_number_of_lossy_connections = GetQuicMaxNumberOfLossyConnections(
1353         quic_trial_params);
1354     if (max_number_of_lossy_connections != 0) {
1355       globals->quic_max_number_of_lossy_connections.set(
1356           max_number_of_lossy_connections);
1357     }
1358     float packet_loss_threshold = GetQuicPacketLossThreshold(quic_trial_params);
1359     if (packet_loss_threshold != 0)
1360       globals->quic_packet_loss_threshold.set(packet_loss_threshold);
1361     globals->enable_quic_port_selection.set(
1362         ShouldEnableQuicPortSelection(command_line));
1363     globals->quic_connection_options =
1364         GetQuicConnectionOptions(command_line, quic_trial_params);
1365     if (ShouldEnableQuicPacing(command_line, quic_trial_params)) {
1366       globals->quic_connection_options.push_back(net::kPACE);
1367     }
1368   }
1369
1370   size_t max_packet_length = GetQuicMaxPacketLength(command_line,
1371                                                     quic_trial_params);
1372   if (max_packet_length != 0) {
1373     globals->quic_max_packet_length.set(max_packet_length);
1374   }
1375
1376   std::string quic_user_agent_id =
1377       chrome::VersionInfo::GetVersionStringModifier();
1378   if (!quic_user_agent_id.empty())
1379     quic_user_agent_id.push_back(' ');
1380   chrome::VersionInfo version_info;
1381   quic_user_agent_id.append(version_info.ProductNameAndVersionForUserAgent());
1382   globals->quic_user_agent_id.set(quic_user_agent_id);
1383
1384   net::QuicVersion version = GetQuicVersion(command_line, quic_trial_params);
1385   if (version != net::QUIC_VERSION_UNSUPPORTED) {
1386     net::QuicVersionVector supported_versions;
1387     supported_versions.push_back(version);
1388     globals->quic_supported_versions.set(supported_versions);
1389   }
1390
1391   double threshold = GetAlternativeProtocolProbabilityThreshold(
1392       command_line, quic_trial_params);
1393   if (threshold >=0 && threshold <= 1) {
1394     globals->alternative_service_probability_threshold.set(threshold);
1395     globals->http_server_properties->SetAlternativeServiceProbabilityThreshold(
1396         threshold);
1397   }
1398
1399   if (command_line.HasSwitch(switches::kOriginToForceQuicOn)) {
1400     net::HostPortPair quic_origin =
1401         net::HostPortPair::FromString(
1402             command_line.GetSwitchValueASCII(switches::kOriginToForceQuicOn));
1403     if (!quic_origin.IsEmpty()) {
1404       globals->origin_to_force_quic_on.set(quic_origin);
1405     }
1406   }
1407 }
1408
1409 bool IOThread::ShouldEnableQuic(const base::CommandLine& command_line,
1410                                 base::StringPiece quic_trial_group,
1411                                 bool quic_allowed_by_policy) {
1412   if (command_line.HasSwitch(switches::kDisableQuic) || !quic_allowed_by_policy)
1413     return false;
1414
1415   if (command_line.HasSwitch(switches::kEnableQuic))
1416     return true;
1417
1418   return quic_trial_group.starts_with(kQuicFieldTrialEnabledGroupName) ||
1419       quic_trial_group.starts_with(kQuicFieldTrialHttpsEnabledGroupName);
1420 }
1421
1422 // static
1423 bool IOThread::ShouldEnableQuicForProxies(const base::CommandLine& command_line,
1424                                           base::StringPiece quic_trial_group,
1425                                           bool quic_allowed_by_policy) {
1426   return ShouldEnableQuic(
1427       command_line, quic_trial_group, quic_allowed_by_policy) ||
1428       ShouldEnableQuicForDataReductionProxy();
1429 }
1430
1431 // static
1432 bool IOThread::ShouldEnableQuicForDataReductionProxy() {
1433   const base::CommandLine& command_line =
1434         *base::CommandLine::ForCurrentProcess();
1435
1436   if (command_line.HasSwitch(switches::kDisableQuic))
1437     return false;
1438
1439   return data_reduction_proxy::DataReductionProxyParams::
1440       IsIncludedInQuicFieldTrial();
1441 }
1442
1443 bool IOThread::ShouldEnableQuicPortSelection(
1444     const base::CommandLine& command_line) {
1445   if (command_line.HasSwitch(switches::kDisableQuicPortSelection))
1446     return false;
1447
1448   if (command_line.HasSwitch(switches::kEnableQuicPortSelection))
1449     return true;
1450
1451   return false;  // Default to disabling port selection on all channels.
1452 }
1453
1454 bool IOThread::ShouldEnableQuicPacing(
1455     const base::CommandLine& command_line,
1456     const VariationParameters& quic_trial_params) {
1457   if (command_line.HasSwitch(switches::kEnableQuicPacing))
1458     return true;
1459
1460   if (command_line.HasSwitch(switches::kDisableQuicPacing))
1461     return false;
1462
1463   return LowerCaseEqualsASCII(
1464       GetVariationParam(quic_trial_params, "enable_pacing"),
1465       "true");
1466 }
1467
1468 net::QuicTagVector IOThread::GetQuicConnectionOptions(
1469     const base::CommandLine& command_line,
1470     const VariationParameters& quic_trial_params) {
1471   if (command_line.HasSwitch(switches::kQuicConnectionOptions)) {
1472     return net::QuicUtils::ParseQuicConnectionOptions(
1473         command_line.GetSwitchValueASCII(switches::kQuicConnectionOptions));
1474   }
1475
1476   VariationParameters::const_iterator it =
1477       quic_trial_params.find("connection_options");
1478   if (it == quic_trial_params.end()) {
1479     return net::QuicTagVector();
1480   }
1481
1482   return net::QuicUtils::ParseQuicConnectionOptions(it->second);
1483 }
1484
1485 // static
1486 double IOThread::GetAlternativeProtocolProbabilityThreshold(
1487     const base::CommandLine& command_line,
1488     const VariationParameters& quic_trial_params) {
1489   double value;
1490   if (command_line.HasSwitch(
1491           switches::kAlternativeServiceProbabilityThreshold)) {
1492     if (base::StringToDouble(
1493             command_line.GetSwitchValueASCII(
1494                 switches::kAlternativeServiceProbabilityThreshold),
1495             &value)) {
1496       return value;
1497     }
1498   }
1499   if (command_line.HasSwitch(switches::kEnableQuic)) {
1500     return 0;
1501   }
1502   // TODO(bnc): Remove when new parameter name rolls out and server
1503   // configuration is changed.
1504   if (base::StringToDouble(
1505           GetVariationParam(quic_trial_params,
1506                             "alternate_protocol_probability_threshold"),
1507           &value)) {
1508     return value;
1509   }
1510   if (base::StringToDouble(
1511           GetVariationParam(quic_trial_params,
1512                             "alternative_service_probability_threshold"),
1513           &value)) {
1514     return value;
1515   }
1516   return -1;
1517 }
1518
1519 // static
1520 bool IOThread::ShouldQuicAlwaysRequireHandshakeConfirmation(
1521     const VariationParameters& quic_trial_params) {
1522   return LowerCaseEqualsASCII(
1523       GetVariationParam(quic_trial_params,
1524                         "always_require_handshake_confirmation"),
1525       "true");
1526 }
1527
1528 // static
1529 bool IOThread::ShouldQuicDisableConnectionPooling(
1530     const VariationParameters& quic_trial_params) {
1531   return LowerCaseEqualsASCII(
1532       GetVariationParam(quic_trial_params, "disable_connection_pooling"),
1533       "true");
1534 }
1535
1536 // static
1537 float IOThread::GetQuicLoadServerInfoTimeoutSrttMultiplier(
1538     const VariationParameters& quic_trial_params) {
1539   double value;
1540   if (base::StringToDouble(GetVariationParam(quic_trial_params,
1541                                              "load_server_info_time_to_srtt"),
1542                            &value)) {
1543     return (float)value;
1544   }
1545   return 0.0f;
1546 }
1547
1548 // static
1549 bool IOThread::ShouldQuicEnableConnectionRacing(
1550     const VariationParameters& quic_trial_params) {
1551   return LowerCaseEqualsASCII(
1552       GetVariationParam(quic_trial_params, "enable_connection_racing"),
1553       "true");
1554 }
1555
1556 // static
1557 bool IOThread::ShouldQuicEnableNonBlockingIO(
1558     const VariationParameters& quic_trial_params) {
1559   return LowerCaseEqualsASCII(
1560       GetVariationParam(quic_trial_params, "enable_non_blocking_io"),
1561       "true");
1562 }
1563
1564 // static
1565 bool IOThread::ShouldQuicDisableDiskCache(
1566     const VariationParameters& quic_trial_params) {
1567   return LowerCaseEqualsASCII(
1568       GetVariationParam(quic_trial_params, "disable_disk_cache"), "true");
1569 }
1570
1571 // static
1572 int IOThread::GetQuicMaxNumberOfLossyConnections(
1573     const VariationParameters& quic_trial_params) {
1574   int value;
1575   if (base::StringToInt(GetVariationParam(quic_trial_params,
1576                                           "max_number_of_lossy_connections"),
1577                         &value)) {
1578     return value;
1579   }
1580   return 0;
1581 }
1582
1583 // static
1584 float IOThread::GetQuicPacketLossThreshold(
1585     const VariationParameters& quic_trial_params) {
1586   double value;
1587   if (base::StringToDouble(GetVariationParam(quic_trial_params,
1588                                              "packet_loss_threshold"),
1589                            &value)) {
1590     return (float)value;
1591   }
1592   return 0.0f;
1593 }
1594
1595 // static
1596 int IOThread::GetQuicSocketReceiveBufferSize(
1597     const VariationParameters& quic_trial_params) {
1598   int value;
1599   if (base::StringToInt(GetVariationParam(quic_trial_params,
1600                                           "receive_buffer_size"),
1601                         &value)) {
1602     return value;
1603   }
1604   return 0;
1605 }
1606
1607 // static
1608 size_t IOThread::GetQuicMaxPacketLength(
1609     const base::CommandLine& command_line,
1610     const VariationParameters& quic_trial_params) {
1611   if (command_line.HasSwitch(switches::kQuicMaxPacketLength)) {
1612     unsigned value;
1613     if (!base::StringToUint(
1614             command_line.GetSwitchValueASCII(switches::kQuicMaxPacketLength),
1615             &value)) {
1616       return 0;
1617     }
1618     return value;
1619   }
1620
1621   unsigned value;
1622   if (base::StringToUint(GetVariationParam(quic_trial_params,
1623                                            "max_packet_length"),
1624                          &value)) {
1625     return value;
1626   }
1627   return 0;
1628 }
1629
1630 // static
1631 net::QuicVersion IOThread::GetQuicVersion(
1632     const base::CommandLine& command_line,
1633     const VariationParameters& quic_trial_params) {
1634   if (command_line.HasSwitch(switches::kQuicVersion)) {
1635     return ParseQuicVersion(
1636         command_line.GetSwitchValueASCII(switches::kQuicVersion));
1637   }
1638
1639   return ParseQuicVersion(GetVariationParam(quic_trial_params, "quic_version"));
1640 }
1641
1642 // static
1643 net::QuicVersion IOThread::ParseQuicVersion(const std::string& quic_version) {
1644   net::QuicVersionVector supported_versions = net::QuicSupportedVersions();
1645   for (size_t i = 0; i < supported_versions.size(); ++i) {
1646     net::QuicVersion version = supported_versions[i];
1647     if (net::QuicVersionToString(version) == quic_version) {
1648       return version;
1649     }
1650   }
1651
1652   return net::QUIC_VERSION_UNSUPPORTED;
1653 }