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/proxy_service_factory.h"
  38 #include "chrome/common/channel_info.h"
  39 #include "chrome/common/chrome_content_client.h"
  40 #include "chrome/common/chrome_switches.h"
  41 #include "chrome/common/pref_names.h"
  42 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_prefs.h"
  43 #include "components/data_reduction_proxy/core/common/data_reduction_proxy_params.h"
  44 #include "components/policy/core/common/policy_service.h"
  45 #include "components/proxy_config/pref_proxy_config_tracker.h"
  46 #include "components/variations/variations_associated_data.h"
  47 #include "components/version_info/version_info.h"
  48 #include "content/public/browser/browser_thread.h"
  49 #include "content/public/browser/cookie_store_factory.h"
  50 #include "content/public/common/user_agent.h"
  51 #include "net/base/external_estimate_provider.h"
  52 #include "net/base/host_mapping_rules.h"
  53 #include "net/base/net_util.h"
  54 #include "net/base/network_quality_estimator.h"
  55 #include "net/base/sdch_manager.h"
  56 #include "net/cert/cert_policy_enforcer.h"
  57 #include "net/cert/cert_verifier.h"
  58 #include "net/cert/cert_verify_proc.h"
  59 #include "net/cert/ct_known_logs.h"
  60 #include "net/cert/ct_known_logs_static.h"
  61 #include "net/cert/ct_log_verifier.h"
  62 #include "net/cert/ct_verifier.h"
  63 #include "net/cert/multi_log_ct_verifier.h"
  64 #include "net/cert/multi_threaded_cert_verifier.h"
  65 #include "net/cookies/cookie_store.h"
  66 #include "net/dns/host_cache.h"
  67 #include "net/dns/host_resolver.h"
  68 #include "net/dns/mapped_host_resolver.h"
  69 #include "net/ftp/ftp_network_layer.h"
  70 #include "net/http/http_auth_filter.h"
  71 #include "net/http/http_auth_handler_factory.h"
  72 #include "net/http/http_network_layer.h"
  73 #include "net/http/http_server_properties_impl.h"
  74 #include "net/proxy/proxy_config_service.h"
  75 #include "net/proxy/proxy_script_fetcher_impl.h"
  76 #include "net/proxy/proxy_service.h"
  77 #include "net/quic/crypto/crypto_protocol.h"
  78 #include "net/quic/quic_protocol.h"
  79 #include "net/quic/quic_utils.h"
  80 #include "net/socket/tcp_client_socket.h"
  81 #include "net/spdy/spdy_session.h"
  82 #include "net/ssl/channel_id_service.h"
  83 #include "net/ssl/default_channel_id_store.h"
  84 #include "net/url_request/data_protocol_handler.h"
  85 #include "net/url_request/file_protocol_handler.h"
  86 #include "net/url_request/ftp_protocol_handler.h"
  87 #include "net/url_request/static_http_user_agent_settings.h"
  88 #include "net/url_request/url_fetcher.h"
  89 #include "net/url_request/url_request_backoff_manager.h"
  90 #include "net/url_request/url_request_context.h"
  91 #include "net/url_request/url_request_context_builder.h"
  92 #include "net/url_request/url_request_context_getter.h"
  93 #include "net/url_request/url_request_job_factory_impl.h"
  94 #include "url/url_constants.h"
  95
  96 #if defined(ENABLE_CONFIGURATION_POLICY)
  97 #include "policy/policy_constants.h"
  98 #endif
  99
 100 #if defined(ENABLE_EXTENSIONS)
 101 #include "chrome/browser/extensions/event_router_forwarder.h"
 102 #endif
 103
 104 #if defined(USE_NSS_CERTS) || defined(OS_IOS)
 105 #include "net/cert_net/nss_ocsp.h"
 106 #endif
 107
 108 #if defined(OS_ANDROID)
 109 #include "base/android/build_info.h"
 110 #include "chrome/browser/android/net/external_estimate_provider_android.h"
 111 #endif
 112
 113 #if defined(OS_CHROMEOS)
 114 #include "chrome/browser/chromeos/net/cert_verify_proc_chromeos.h"
 115 #include "chromeos/network/host_resolver_impl_chromeos.h"
 116 #endif
 117
 118 using content::BrowserThread;
 119
 120 class SafeBrowsingURLRequestContext;
 121
 122 // The IOThread object must outlive any tasks posted to the IO thread before the
 123 // Quit task, so base::Bind() calls are not refcounted.
 124
 125 namespace {
 126
 127 const char kTCPFastOpenFieldTrialName[] = "TCPFastOpen";
 128 const char kTCPFastOpenHttpsEnabledGroupName[] = "HttpsEnabled";
 129
 130 const char kQuicFieldTrialName[] = "QUIC";
 131 const char kQuicFieldTrialEnabledGroupName[] = "Enabled";
 132 const char kQuicFieldTrialHttpsEnabledGroupName[] = "HttpsEnabled";
 133
 134 // The SPDY trial composes two different trial plus control groups:
 135 //  * A "holdback" group with SPDY disabled, and corresponding control
 136 //  (SPDY/3.1). The primary purpose of the holdback group is to encourage site
 137 //  operators to do feature detection rather than UA-sniffing. As such, this
 138 //  trial runs continuously.
 139 //  * A SPDY/4 experiment, for SPDY/4 (aka HTTP/2) vs SPDY/3.1 comparisons and
 140 //  eventual SPDY/4 deployment.
 141 const char kSpdyFieldTrialName[] = "SPDY";
 142 const char kSpdyFieldTrialHoldbackGroupNamePrefix[] = "SpdyDisabled";
 143 const char kSpdyFieldTrialSpdy31GroupNamePrefix[] = "Spdy31Enabled";
 144 const char kSpdyFieldTrialSpdy4GroupNamePrefix[] = "Spdy4Enabled";
 145 const char kSpdyFieldTrialParametrizedPrefix[] = "Parametrized";
 146
 147 // Field trial for network quality estimator. Seeds RTT and downstream
 148 // throughput observations with values that correspond to the connection type
 149 // determined by the operating system.
 150 const char kNetworkQualityEstimatorFieldTrialName[] = "NetworkQualityEstimator";
 151
 152 #if defined(OS_MACOSX) && !defined(OS_IOS)
 153 void ObserveKeychainEvents() {
 154   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 155   net::CertDatabase::GetInstance()->SetMessageLoopForKeychainEvents();
 156 }
 157 #endif
 158
 159 // Used for the "system" URLRequestContext.
 160 class SystemURLRequestContext : public net::URLRequestContext {
 161  public:
 162   SystemURLRequestContext() {
 163 #if defined(USE_NSS_CERTS) || defined(OS_IOS)
 164     net::SetURLRequestContextForNSSHttpIO(this);
 165 #endif
 166   }
 167
 168  private:
 169   ~SystemURLRequestContext() override {
 170     AssertNoURLRequests();
 171 #if defined(USE_NSS_CERTS) || defined(OS_IOS)
 172     net::SetURLRequestContextForNSSHttpIO(NULL);
 173 #endif
 174   }
 175 };
 176
 177 scoped_ptr<net::HostResolver> CreateGlobalHostResolver(net::NetLog* net_log) {
 178   TRACE_EVENT0("startup", "IOThread::CreateGlobalHostResolver");
 179   const base::CommandLine& command_line =
 180       *base::CommandLine::ForCurrentProcess();
 181
 182   net::HostResolver::Options options;
 183
 184   // Use the retry attempts override from the command-line, if any.
 185   if (command_line.HasSwitch(switches::kHostResolverRetryAttempts)) {
 186     std::string s =
 187         command_line.GetSwitchValueASCII(switches::kHostResolverRetryAttempts);
 188     // Parse the switch (it should be a non-negative integer).
 189     int n;
 190     if (base::StringToInt(s, &n) && n >= 0) {
 191       options.max_retry_attempts = static_cast<size_t>(n);
 192     } else {
 193       LOG(ERROR) << "Invalid switch for host resolver retry attempts: " << s;
 194     }
 195   }
 196
 197   scoped_ptr<net::HostResolver> global_host_resolver;
 198 #if defined OS_CHROMEOS
 199   global_host_resolver =
 200       chromeos::HostResolverImplChromeOS::CreateSystemResolver(options,
 201                                                                net_log);
 202 #else
 203   global_host_resolver =
 204       net::HostResolver::CreateSystemResolver(options, net_log);
 205 #endif
 206
 207   // If hostname remappings were specified on the command-line, layer these
 208   // rules on top of the real host resolver. This allows forwarding all requests
 209   // through a designated test server.
 210   if (!command_line.HasSwitch(switches::kHostResolverRules))
 211     return global_host_resolver.Pass();
 212
 213   scoped_ptr<net::MappedHostResolver> remapped_resolver(
 214       new net::MappedHostResolver(global_host_resolver.Pass()));
 215   remapped_resolver->SetRulesFromString(
 216       command_line.GetSwitchValueASCII(switches::kHostResolverRules));
 217   return remapped_resolver.Pass();
 218 }
 219
 220 int GetSwitchValueAsInt(const base::CommandLine& command_line,
 221                         const std::string& switch_name) {
 222   int value;
 223   if (!base::StringToInt(command_line.GetSwitchValueASCII(switch_name),
 224                          &value)) {
 225     return 0;
 226   }
 227   return value;
 228 }
 229
 230 // Returns the value associated with |key| in |params| or "" if the
 231 // key is not present in the map.
 232 const std::string& GetVariationParam(
 233     const std::map<std::string, std::string>& params,
 234     const std::string& key) {
 235   std::map<std::string, std::string>::const_iterator it = params.find(key);
 236   if (it == params.end())
 237     return base::EmptyString();
 238
 239   return it->second;
 240 }
 241
 242 // Parse kUseSpdy command line flag options, which may contain the following:
 243 //
 244 //   "off"                      : Disables SPDY support entirely.
 245 //   "no-ping"                  : Disables SPDY ping connection testing.
 246 //   "exclude=<host>"           : Disables SPDY support for the host <host>.
 247 //   "no-compress"              : Disables SPDY header compression.
 248 //   "init-max-streams=<limit>" : Specifies the maximum number of concurrent
 249 //                                streams for a SPDY session, unless the
 250 //                                specifies a different value via SETTINGS.
 251 void ConfigureSpdyGlobalsFromUseSpdyArgument(const std::string& mode,
 252                                              IOThread::Globals* globals) {
 253   static const char kOff[] = "off";
 254   static const char kDisablePing[] = "no-ping";
 255   static const char kExclude[] = "exclude";  // Hosts to exclude
 256   static const char kDisableCompression[] = "no-compress";
 257   static const char kInitialMaxConcurrentStreams[] = "init-max-streams";
 258
 259   for (const base::StringPiece& element : base::SplitStringPiece(
 260            mode, ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL)) {
 261     std::vector<base::StringPiece> name_value = base::SplitStringPiece(
 262         element, "=", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
 263     const base::StringPiece option =
 264         name_value.size() > 0 ? name_value[0] : base::StringPiece();
 265     const base::StringPiece value =
 266         name_value.size() > 1 ? name_value[1] : base::StringPiece();
 267
 268     if (option == kOff) {
 269       net::HttpStreamFactory::set_spdy_enabled(false);
 270       continue;
 271     }
 272     if (option == kDisablePing) {
 273       globals->enable_spdy_ping_based_connection_checking.set(false);
 274       continue;
 275     }
 276     if (option == kExclude) {
 277       globals->forced_spdy_exclusions.insert(
 278           net::HostPortPair::FromURL(GURL(value.as_string())));
 279       continue;
 280     }
 281     if (option == kDisableCompression) {
 282       globals->enable_spdy_compression.set(false);
 283       continue;
 284     }
 285     if (option == kInitialMaxConcurrentStreams) {
 286       int streams;
 287       if (base::StringToInt(value, &streams)) {
 288         globals->initial_max_spdy_concurrent_streams.set(streams);
 289         continue;
 290       }
 291     }
 292     LOG(DFATAL) << "Unrecognized spdy option: " << option.as_string();
 293   }
 294 }
 295
 296 }  // namespace
 297
 298 class IOThread::LoggingNetworkChangeObserver
 299     : public net::NetworkChangeNotifier::IPAddressObserver,
 300       public net::NetworkChangeNotifier::ConnectionTypeObserver,
 301       public net::NetworkChangeNotifier::NetworkChangeObserver {
 302  public:
 303   // |net_log| must remain valid throughout our lifetime.
 304   explicit LoggingNetworkChangeObserver(net::NetLog* net_log)
 305       : net_log_(net_log) {
 306     net::NetworkChangeNotifier::AddIPAddressObserver(this);
 307     net::NetworkChangeNotifier::AddConnectionTypeObserver(this);
 308     net::NetworkChangeNotifier::AddNetworkChangeObserver(this);
 309   }
 310
 311   ~LoggingNetworkChangeObserver() override {
 312     net::NetworkChangeNotifier::RemoveIPAddressObserver(this);
 313     net::NetworkChangeNotifier::RemoveConnectionTypeObserver(this);
 314     net::NetworkChangeNotifier::RemoveNetworkChangeObserver(this);
 315   }
 316
 317   // NetworkChangeNotifier::IPAddressObserver implementation.
 318   void OnIPAddressChanged() override {
 319     VLOG(1) << "Observed a change to the network IP addresses";
 320
 321     net_log_->AddGlobalEntry(net::NetLog::TYPE_NETWORK_IP_ADDRESSES_CHANGED);
 322   }
 323
 324   // NetworkChangeNotifier::ConnectionTypeObserver implementation.
 325   void OnConnectionTypeChanged(
 326       net::NetworkChangeNotifier::ConnectionType type) override {
 327     std::string type_as_string =
 328         net::NetworkChangeNotifier::ConnectionTypeToString(type);
 329
 330     VLOG(1) << "Observed a change to network connectivity state "
 331             << type_as_string;
 332
 333     net_log_->AddGlobalEntry(
 334         net::NetLog::TYPE_NETWORK_CONNECTIVITY_CHANGED,
 335         net::NetLog::StringCallback("new_connection_type", &type_as_string));
 336   }
 337
 338   // NetworkChangeNotifier::NetworkChangeObserver implementation.
 339   void OnNetworkChanged(
 340       net::NetworkChangeNotifier::ConnectionType type) override {
 341     std::string type_as_string =
 342         net::NetworkChangeNotifier::ConnectionTypeToString(type);
 343
 344     VLOG(1) << "Observed a network change to state " << type_as_string;
 345
 346     net_log_->AddGlobalEntry(
 347         net::NetLog::TYPE_NETWORK_CHANGED,
 348         net::NetLog::StringCallback("new_connection_type", &type_as_string));
 349   }
 350
 351  private:
 352   net::NetLog* net_log_;
 353   DISALLOW_COPY_AND_ASSIGN(LoggingNetworkChangeObserver);
 354 };
 355
 356 class SystemURLRequestContextGetter : public net::URLRequestContextGetter {
 357  public:
 358   explicit SystemURLRequestContextGetter(IOThread* io_thread);
 359
 360   // Implementation for net::UrlRequestContextGetter.
 361   net::URLRequestContext* GetURLRequestContext() override;
 362   scoped_refptr<base::SingleThreadTaskRunner> GetNetworkTaskRunner()
 363       const override;
 364
 365  protected:
 366   ~SystemURLRequestContextGetter() override;
 367
 368  private:
 369   IOThread* const io_thread_;  // Weak pointer, owned by BrowserProcess.
 370   scoped_refptr<base::SingleThreadTaskRunner> network_task_runner_;
 371
 372   base::debug::LeakTracker<SystemURLRequestContextGetter> leak_tracker_;
 373 };
 374
 375 SystemURLRequestContextGetter::SystemURLRequestContextGetter(
 376     IOThread* io_thread)
 377     : io_thread_(io_thread),
 378       network_task_runner_(
 379           BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO)) {
 380 }
 381
 382 SystemURLRequestContextGetter::~SystemURLRequestContextGetter() {}
 383
 384 net::URLRequestContext* SystemURLRequestContextGetter::GetURLRequestContext() {
 385   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 386   DCHECK(io_thread_->globals()->system_request_context.get());
 387
 388   return io_thread_->globals()->system_request_context.get();
 389 }
 390
 391 scoped_refptr<base::SingleThreadTaskRunner>
 392 SystemURLRequestContextGetter::GetNetworkTaskRunner() const {
 393   return network_task_runner_;
 394 }
 395
 396 IOThread::Globals::
 397 SystemRequestContextLeakChecker::SystemRequestContextLeakChecker(
 398     Globals* globals)
 399     : globals_(globals) {
 400   DCHECK(globals_);
 401 }
 402
 403 IOThread::Globals::
 404 SystemRequestContextLeakChecker::~SystemRequestContextLeakChecker() {
 405   if (globals_->system_request_context.get())
 406     globals_->system_request_context->AssertNoURLRequests();
 407 }
 408
 409 IOThread::Globals::Globals()
 410     : system_request_context_leak_checker(this),
 411       ignore_certificate_errors(false),
 412       testing_fixed_http_port(0),
 413       testing_fixed_https_port(0),
 414       enable_user_alternate_protocol_ports(false) {
 415 }
 416
 417 IOThread::Globals::~Globals() {}
 418
 419 // |local_state| is passed in explicitly in order to (1) reduce implicit
 420 // dependencies and (2) make IOThread more flexible for testing.
 421 IOThread::IOThread(
 422     PrefService* local_state,
 423     policy::PolicyService* policy_service,
 424     ChromeNetLog* net_log,
 425     extensions::EventRouterForwarder* extension_event_router_forwarder)
 426     : net_log_(net_log),
 427 #if defined(ENABLE_EXTENSIONS)
 428       extension_event_router_forwarder_(extension_event_router_forwarder),
 429 #endif
 430       globals_(NULL),
 431       is_spdy_disabled_by_policy_(false),
 432       is_quic_allowed_by_policy_(true),
 433       creation_time_(base::TimeTicks::Now()),
 434       weak_factory_(this) {
 435   auth_schemes_ = local_state->GetString(prefs::kAuthSchemes);
 436   negotiate_disable_cname_lookup_ = local_state->GetBoolean(
 437       prefs::kDisableAuthNegotiateCnameLookup);
 438   negotiate_enable_port_ = local_state->GetBoolean(
 439       prefs::kEnableAuthNegotiatePort);
 440   auth_server_whitelist_ = local_state->GetString(prefs::kAuthServerWhitelist);
 441   auth_delegate_whitelist_ = local_state->GetString(
 442       prefs::kAuthNegotiateDelegateWhitelist);
 443   gssapi_library_name_ = local_state->GetString(prefs::kGSSAPILibraryName);
 444   auth_android_negotiate_account_type_ =
 445       local_state->GetString(prefs::kAuthAndroidNegotiateAccountType);
 446   pref_proxy_config_tracker_.reset(
 447       ProxyServiceFactory::CreatePrefProxyConfigTrackerOfLocalState(
 448           local_state));
 449   ChromeNetworkDelegate::InitializePrefsOnUIThread(
 450       &system_enable_referrers_,
 451       NULL,
 452       NULL,
 453       NULL,
 454       local_state);
 455   ssl_config_service_manager_.reset(
 456       SSLConfigServiceManager::CreateDefaultManager(local_state));
 457
 458   base::Value* dns_client_enabled_default = new base::FundamentalValue(
 459       chrome_browser_net::ConfigureAsyncDnsFieldTrial());
 460   local_state->SetDefaultPrefValue(prefs::kBuiltInDnsClientEnabled,
 461                                    dns_client_enabled_default);
 462   chrome_browser_net::LogAsyncDnsPrefSource(
 463       local_state->FindPreference(prefs::kBuiltInDnsClientEnabled));
 464
 465   dns_client_enabled_.Init(prefs::kBuiltInDnsClientEnabled,
 466                            local_state,
 467                            base::Bind(&IOThread::UpdateDnsClientEnabled,
 468                                       base::Unretained(this)));
 469   dns_client_enabled_.MoveToThread(
 470       BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO));
 471
 472   quick_check_enabled_.Init(prefs::kQuickCheckEnabled,
 473                             local_state);
 474   quick_check_enabled_.MoveToThread(
 475       BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO));
 476
 477 #if defined(ENABLE_CONFIGURATION_POLICY)
 478   is_spdy_disabled_by_policy_ = policy_service->GetPolicies(
 479       policy::PolicyNamespace(policy::POLICY_DOMAIN_CHROME, std::string())).Get(
 480           policy::key::kDisableSpdy) != NULL;
 481
 482   const base::Value* value = policy_service->GetPolicies(
 483       policy::PolicyNamespace(policy::POLICY_DOMAIN_CHROME,
 484       std::string())).GetValue(policy::key::kQuicAllowed);
 485   if (value)
 486     value->GetAsBoolean(&is_quic_allowed_by_policy_);
 487 #endif  // ENABLE_CONFIGURATION_POLICY
 488
 489   BrowserThread::SetDelegate(BrowserThread::IO, this);
 490 }
 491
 492 IOThread::~IOThread() {
 493   // This isn't needed for production code, but in tests, IOThread may
 494   // be multiply constructed.
 495   BrowserThread::SetDelegate(BrowserThread::IO, NULL);
 496
 497   pref_proxy_config_tracker_->DetachFromPrefService();
 498   DCHECK(!globals_);
 499 }
 500
 501 IOThread::Globals* IOThread::globals() {
 502   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 503   return globals_;
 504 }
 505
 506 void IOThread::SetGlobalsForTesting(Globals* globals) {
 507   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 508   DCHECK(!globals || !globals_);
 509   globals_ = globals;
 510 }
 511
 512 ChromeNetLog* IOThread::net_log() {
 513   return net_log_;
 514 }
 515
 516 void IOThread::ChangedToOnTheRecord() {
 517   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 518   BrowserThread::PostTask(
 519       BrowserThread::IO,
 520       FROM_HERE,
 521       base::Bind(&IOThread::ChangedToOnTheRecordOnIOThread,
 522                  base::Unretained(this)));
 523 }
 524
 525 net::URLRequestContextGetter* IOThread::system_url_request_context_getter() {
 526   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 527   if (!system_url_request_context_getter_.get()) {
 528     InitSystemRequestContext();
 529   }
 530   return system_url_request_context_getter_.get();
 531 }
 532
 533 void IOThread::Init() {
 534   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 535   // is fixed.
 536   tracked_objects::ScopedTracker tracking_profile1(
 537       FROM_HERE_WITH_EXPLICIT_FUNCTION("466432 IOThread::InitAsync::Start"));
 538   TRACE_EVENT0("startup", "IOThread::InitAsync");
 539   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 540
 541 #if defined(USE_NSS_CERTS) || defined(OS_IOS)
 542   net::SetMessageLoopForNSSHttpIO();
 543 #endif
 544
 545   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 546   // is fixed.
 547   tracked_objects::ScopedTracker tracking_profile2(
 548       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 549           "466432 IOThread::InitAsync::CommandLineForCurrentProcess"));
 550   const base::CommandLine& command_line =
 551       *base::CommandLine::ForCurrentProcess();
 552
 553   DCHECK(!globals_);
 554   globals_ = new Globals;
 555
 556   // Add an observer that will emit network change events to the ChromeNetLog.
 557   // Assuming NetworkChangeNotifier dispatches in FIFO order, we should be
 558   // logging the network change before other IO thread consumers respond to it.
 559   network_change_observer_.reset(
 560       new LoggingNetworkChangeObserver(net_log_));
 561
 562   // Setup the HistogramWatcher to run on the IO thread.
 563   net::NetworkChangeNotifier::InitHistogramWatcher();
 564
 565 #if defined(ENABLE_EXTENSIONS)
 566   globals_->extension_event_router_forwarder =
 567       extension_event_router_forwarder_;
 568 #endif
 569
 570   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 571   // is fixed.
 572   tracked_objects::ScopedTracker tracking_profile3(
 573       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 574           "466432 IOThread::InitAsync::ChromeNetworkDelegate"));
 575   scoped_ptr<ChromeNetworkDelegate> chrome_network_delegate(
 576       new ChromeNetworkDelegate(extension_event_router_forwarder(),
 577                                 &system_enable_referrers_));
 578
 579   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 580   // is fixed.
 581   tracked_objects::ScopedTracker tracking_profile4(
 582       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 583           "466432 IOThread::InitAsync::CreateGlobalHostResolver"));
 584   globals_->system_network_delegate = chrome_network_delegate.Pass();
 585   globals_->host_resolver = CreateGlobalHostResolver(net_log_);
 586
 587   std::map<std::string, std::string> network_quality_estimator_params;
 588   variations::GetVariationParams(kNetworkQualityEstimatorFieldTrialName,
 589                                  &network_quality_estimator_params);
 590
 591   scoped_ptr<net::ExternalEstimateProvider> external_estimate_provider;
 592 #if defined(OS_ANDROID)
 593   external_estimate_provider.reset(
 594       new chrome::android::ExternalEstimateProviderAndroid());
 595 #endif
 596   // Pass ownership.
 597   globals_->network_quality_estimator.reset(new net::NetworkQualityEstimator(
 598       external_estimate_provider.Pass(), network_quality_estimator_params));
 599
 600   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 601   // is fixed.
 602   tracked_objects::ScopedTracker tracking_profile5(
 603       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 604           "466432 IOThread::InitAsync::UpdateDnsClientEnabled::Start"));
 605   UpdateDnsClientEnabled();
 606   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 607   // is fixed.
 608   tracked_objects::ScopedTracker tracking_profile6(
 609       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 610           "466432 IOThread::InitAsync::UpdateDnsClientEnabled::End"));
 611 #if defined(OS_CHROMEOS)
 612   // Creates a CertVerifyProc that doesn't allow any profile-provided certs.
 613   globals_->cert_verifier.reset(new net::MultiThreadedCertVerifier(
 614       new chromeos::CertVerifyProcChromeOS()));
 615 #else
 616   globals_->cert_verifier.reset(new net::MultiThreadedCertVerifier(
 617       net::CertVerifyProc::CreateDefault()));
 618 #endif
 619
 620   globals_->transport_security_state.reset(new net::TransportSecurityState());
 621
 622   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 623   // is fixed.
 624   tracked_objects::ScopedTracker tracking_profile8(
 625       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 626           "466432 IOThread::InitAsync::CreateLogVerifiers::Start"));
 627   std::vector<scoped_refptr<net::CTLogVerifier>> ct_logs(
 628       net::ct::CreateLogVerifiersForKnownLogs());
 629
 630   // Add logs from command line
 631   if (command_line.HasSwitch(switches::kCertificateTransparencyLog)) {
 632     std::string switch_value = command_line.GetSwitchValueASCII(
 633         switches::kCertificateTransparencyLog);
 634     for (const base::StringPiece& curr_log : base::SplitStringPiece(
 635              switch_value, ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL)) {
 636       std::vector<std::string> log_metadata = base::SplitString(
 637           curr_log, ":", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
 638       CHECK_GE(log_metadata.size(), 3u)
 639           << "CT log metadata missing: Switch format is "
 640           << "'description:base64_key:url_without_schema'.";
 641       std::string log_description(log_metadata[0]);
 642       std::string log_url(std::string("https://") + log_metadata[2]);
 643       std::string ct_public_key_data;
 644       CHECK(base::Base64Decode(log_metadata[1], &ct_public_key_data))
 645           << "Unable to decode CT public key.";
 646       scoped_refptr<net::CTLogVerifier> external_log_verifier(
 647           net::CTLogVerifier::Create(ct_public_key_data, log_description,
 648                                      log_url));
 649       CHECK(external_log_verifier) << "Unable to parse CT public key.";
 650       VLOG(1) << "Adding log with description " << log_description;
 651       ct_logs.push_back(external_log_verifier);
 652     }
 653   }
 654
 655   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 656   // is fixed.
 657   tracked_objects::ScopedTracker tracking_profile9(
 658       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 659           "466432 IOThread::InitAsync::CreateLogVerifiers::End"));
 660   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 661   // is fixed.
 662   tracked_objects::ScopedTracker tracking_profile7(
 663       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 664           "466432 IOThread::InitAsync::CreateMultiLogVerifier"));
 665   net::MultiLogCTVerifier* ct_verifier = new net::MultiLogCTVerifier();
 666   globals_->cert_transparency_verifier.reset(ct_verifier);
 667   // Add built-in logs
 668   ct_verifier->AddLogs(ct_logs);
 669
 670   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 671   // is fixed.
 672   tracked_objects::ScopedTracker tracking_profile10(
 673       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 674           "466432 IOThread::InitAsync::CertPolicyEnforcer"));
 675   net::CertPolicyEnforcer* policy_enforcer = new net::CertPolicyEnforcer;
 676   globals_->cert_policy_enforcer.reset(policy_enforcer);
 677
 678   globals_->ssl_config_service = GetSSLConfigService();
 679
 680   globals_->http_auth_handler_factory.reset(CreateDefaultAuthHandlerFactory(
 681       globals_->host_resolver.get()));
 682   globals_->http_server_properties.reset(new net::HttpServerPropertiesImpl());
 683   // For the ProxyScriptFetcher, we use a direct ProxyService.
 684   globals_->proxy_script_fetcher_proxy_service.reset(
 685       net::ProxyService::CreateDirectWithNetLog(net_log_));
 686   // In-memory cookie store.
 687   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 688   // is fixed.
 689   tracked_objects::ScopedTracker tracking_profile11(
 690       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 691           "466432 IOThread::InitAsync::CreateCookieStore::Start"));
 692   globals_->system_cookie_store =
 693         content::CreateCookieStore(content::CookieStoreConfig());
 694   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 695   // is fixed.
 696   tracked_objects::ScopedTracker tracking_profile12(
 697       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 698           "466432 IOThread::InitAsync::CreateCookieStore::End"));
 699   // In-memory channel ID store.
 700   globals_->system_channel_id_service.reset(
 701       new net::ChannelIDService(
 702           new net::DefaultChannelIDStore(NULL),
 703           base::WorkerPool::GetTaskRunner(true)));
 704   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 705   // is fixed.
 706   tracked_objects::ScopedTracker tracking_profile12_1(
 707       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 708           "466432 IOThread::InitAsync::CreateDnsProbeService"));
 709   globals_->dns_probe_service.reset(new chrome_browser_net::DnsProbeService());
 710   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 711   // is fixed.
 712   tracked_objects::ScopedTracker tracking_profile12_2(
 713       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 714           "466432 IOThread::InitAsync::CreateHostMappingRules"));
 715   globals_->host_mapping_rules.reset(new net::HostMappingRules());
 716   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 717   // is fixed.
 718   tracked_objects::ScopedTracker tracking_profile12_3(
 719       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 720           "466432 IOThread::InitAsync::CreateHTTPUserAgentSettings"));
 721   globals_->http_user_agent_settings.reset(
 722       new net::StaticHttpUserAgentSettings(std::string(), GetUserAgent()));
 723   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 724   // is fixed.
 725   tracked_objects::ScopedTracker tracking_profile12_4(
 726       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 727           "466432 IOThread::InitAsync::CommandLineConfiguration"));
 728   if (command_line.HasSwitch(switches::kHostRules)) {
 729     TRACE_EVENT_BEGIN0("startup", "IOThread::InitAsync:SetRulesFromString");
 730     globals_->host_mapping_rules->SetRulesFromString(
 731         command_line.GetSwitchValueASCII(switches::kHostRules));
 732     TRACE_EVENT_END0("startup", "IOThread::InitAsync:SetRulesFromString");
 733   }
 734   if (command_line.HasSwitch(switches::kIgnoreCertificateErrors))
 735     globals_->ignore_certificate_errors = true;
 736   if (command_line.HasSwitch(switches::kTestingFixedHttpPort)) {
 737     globals_->testing_fixed_http_port =
 738         GetSwitchValueAsInt(command_line, switches::kTestingFixedHttpPort);
 739   }
 740   if (command_line.HasSwitch(switches::kTestingFixedHttpsPort)) {
 741     globals_->testing_fixed_https_port =
 742         GetSwitchValueAsInt(command_line, switches::kTestingFixedHttpsPort);
 743   }
 744   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 745   // is fixed.
 746   tracked_objects::ScopedTracker tracking_profile12_5(
 747       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 748           "466432 IOThread::InitAsync::QuicConfiguration"));
 749   ConfigureQuic(command_line);
 750   if (command_line.HasSwitch(
 751           switches::kEnableUserAlternateProtocolPorts)) {
 752     globals_->enable_user_alternate_protocol_ports = true;
 753   }
 754   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
 755   // is fixed.
 756   tracked_objects::ScopedTracker tracking_profile13(
 757       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 758           "466432 IOThread::InitAsync::InitializeNetworkOptions"));
 759   InitializeNetworkOptions(command_line);
 760
 761   TRACE_EVENT_BEGIN0("startup",
 762                      "IOThread::Init:ProxyScriptFetcherRequestContext");
 763   globals_->proxy_script_fetcher_context.reset(
 764       ConstructProxyScriptFetcherContext(globals_, net_log_));
 765   TRACE_EVENT_END0("startup",
 766                    "IOThread::Init:ProxyScriptFetcherRequestContext");
 767
 768   const version_info::Channel channel = chrome::GetChannel();
 769   if (channel == version_info::Channel::UNKNOWN ||
 770       channel == version_info::Channel::CANARY ||
 771       channel == version_info::Channel::DEV) {
 772     globals_->url_request_backoff_manager.reset(
 773         new net::URLRequestBackoffManager());
 774   }
 775
 776 #if defined(OS_MACOSX) && !defined(OS_IOS)
 777   // Start observing Keychain events. This needs to be done on the UI thread,
 778   // as Keychain services requires a CFRunLoop.
 779   BrowserThread::PostTask(BrowserThread::UI,
 780                           FROM_HERE,
 781                           base::Bind(&ObserveKeychainEvents));
 782 #endif
 783
 784   // InitSystemRequestContext turns right around and posts a task back
 785   // to the IO thread, so we can't let it run until we know the IO
 786   // thread has started.
 787   //
 788   // Note that since we are at BrowserThread::Init time, the UI thread
 789   // is blocked waiting for the thread to start.  Therefore, posting
 790   // this task to the main thread's message loop here is guaranteed to
 791   // get it onto the message loop while the IOThread object still
 792   // exists.  However, the message might not be processed on the UI
 793   // thread until after IOThread is gone, so use a weak pointer.
 794   BrowserThread::PostTask(BrowserThread::UI,
 795                           FROM_HERE,
 796                           base::Bind(&IOThread::InitSystemRequestContext,
 797                                      weak_factory_.GetWeakPtr()));
 798 }
 799
 800 void IOThread::CleanUp() {
 801   base::debug::LeakTracker<SafeBrowsingURLRequestContext>::CheckForLeaks();
 802
 803 #if defined(USE_NSS_CERTS) || defined(OS_IOS)
 804   net::ShutdownNSSHttpIO();
 805 #endif
 806
 807   system_url_request_context_getter_ = NULL;
 808
 809   // Release objects that the net::URLRequestContext could have been pointing
 810   // to.
 811
 812   // Shutdown the HistogramWatcher on the IO thread.
 813   net::NetworkChangeNotifier::ShutdownHistogramWatcher();
 814
 815   // This must be reset before the ChromeNetLog is destroyed.
 816   network_change_observer_.reset();
 817
 818   system_proxy_config_service_.reset();
 819
 820   delete globals_;
 821   globals_ = NULL;
 822
 823   base::debug::LeakTracker<SystemURLRequestContextGetter>::CheckForLeaks();
 824 }
 825
 826 void IOThread::InitializeNetworkOptions(const base::CommandLine& command_line) {
 827   // Only handle use-spdy command line flags if "spdy.disabled" preference is
 828   // not disabled via policy.
 829   if (is_spdy_disabled_by_policy_) {
 830     base::FieldTrial* trial = base::FieldTrialList::Find(kSpdyFieldTrialName);
 831     if (trial)
 832       trial->Disable();
 833   } else {
 834     std::string group = base::FieldTrialList::FindFullName(kSpdyFieldTrialName);
 835     VariationParameters params;
 836     if (!variations::GetVariationParams(kSpdyFieldTrialName, &params)) {
 837       params.clear();
 838     }
 839     ConfigureSpdyGlobals(command_line, group, params, globals_);
 840   }
 841
 842   ConfigureTCPFastOpen(command_line);
 843
 844   // TODO(rch): Make the client socket factory a per-network session
 845   // instance, constructed from a NetworkSession::Params, to allow us
 846   // to move this option to IOThread::Globals &
 847   // HttpNetworkSession::Params.
 848 }
 849
 850 void IOThread::ConfigureTCPFastOpen(const base::CommandLine& command_line) {
 851   const std::string trial_group =
 852       base::FieldTrialList::FindFullName(kTCPFastOpenFieldTrialName);
 853   if (trial_group == kTCPFastOpenHttpsEnabledGroupName)
 854     globals_->enable_tcp_fast_open_for_ssl.set(true);
 855   bool always_enable_if_supported =
 856       command_line.HasSwitch(switches::kEnableTcpFastOpen);
 857   // Check for OS support of TCP FastOpen, and turn it on for all connections
 858   // if indicated by user.
 859   net::CheckSupportAndMaybeEnableTCPFastOpen(always_enable_if_supported);
 860 }
 861
 862 void IOThread::ConfigureSpdyGlobals(
 863     const base::CommandLine& command_line,
 864     base::StringPiece spdy_trial_group,
 865     const VariationParameters& spdy_trial_params,
 866     IOThread::Globals* globals) {
 867   if (command_line.HasSwitch(switches::kTrustedSpdyProxy)) {
 868     globals->trusted_spdy_proxy.set(
 869         command_line.GetSwitchValueASCII(switches::kTrustedSpdyProxy));
 870   }
 871   if (command_line.HasSwitch(switches::kIgnoreUrlFetcherCertRequests))
 872     net::URLFetcher::SetIgnoreCertificateRequests(true);
 873
 874   if (command_line.HasSwitch(switches::kUseSpdy)) {
 875     std::string spdy_mode =
 876         command_line.GetSwitchValueASCII(switches::kUseSpdy);
 877     ConfigureSpdyGlobalsFromUseSpdyArgument(spdy_mode, globals);
 878     return;
 879   }
 880
 881   globals->next_protos.clear();
 882   globals->next_protos.push_back(net::kProtoHTTP11);
 883   bool enable_quic = false;
 884   globals->enable_quic.CopyToIfSet(&enable_quic);
 885   if (enable_quic) {
 886     globals->next_protos.push_back(net::kProtoQUIC1SPDY3);
 887   }
 888
 889   // No SPDY command-line flags have been specified. Examine trial groups.
 890   if (spdy_trial_group.starts_with(kSpdyFieldTrialHoldbackGroupNamePrefix)) {
 891     net::HttpStreamFactory::set_spdy_enabled(false);
 892     return;
 893   }
 894   if (spdy_trial_group.starts_with(kSpdyFieldTrialSpdy31GroupNamePrefix)) {
 895     globals->next_protos.push_back(net::kProtoSPDY31);
 896     return;
 897   }
 898   if (spdy_trial_group.starts_with(kSpdyFieldTrialSpdy4GroupNamePrefix)) {
 899     globals->next_protos.push_back(net::kProtoSPDY31);
 900     globals->next_protos.push_back(net::kProtoHTTP2);
 901     return;
 902   }
 903   if (spdy_trial_group.starts_with(kSpdyFieldTrialParametrizedPrefix)) {
 904     bool spdy_enabled = false;
 905     if (base::LowerCaseEqualsASCII(
 906             GetVariationParam(spdy_trial_params, "enable_spdy31"), "true")) {
 907       globals->next_protos.push_back(net::kProtoSPDY31);
 908       spdy_enabled = true;
 909     }
 910     if (base::LowerCaseEqualsASCII(
 911             GetVariationParam(spdy_trial_params, "enable_http2"), "true")) {
 912       globals->next_protos.push_back(net::kProtoHTTP2);
 913       spdy_enabled = true;
 914     }
 915     // TODO(bnc): HttpStreamFactory::spdy_enabled_ is redundant with
 916     // globals->next_protos, can it be eliminated?
 917     net::HttpStreamFactory::set_spdy_enabled(spdy_enabled);
 918     return;
 919   }
 920
 921   // By default, enable HTTP/2.
 922   globals->next_protos.push_back(net::kProtoSPDY31);
 923   globals->next_protos.push_back(net::kProtoHTTP2);
 924 }
 925
 926 void IOThread::RegisterPrefs(PrefRegistrySimple* registry) {
 927   registry->RegisterStringPref(prefs::kAuthSchemes,
 928                                "basic,digest,ntlm,negotiate");
 929   registry->RegisterBooleanPref(prefs::kDisableAuthNegotiateCnameLookup, false);
 930   registry->RegisterBooleanPref(prefs::kEnableAuthNegotiatePort, false);
 931   registry->RegisterStringPref(prefs::kAuthServerWhitelist, std::string());
 932   registry->RegisterStringPref(prefs::kAuthNegotiateDelegateWhitelist,
 933                                std::string());
 934   registry->RegisterStringPref(prefs::kGSSAPILibraryName, std::string());
 935   registry->RegisterStringPref(prefs::kAuthAndroidNegotiateAccountType,
 936                                std::string());
 937   registry->RegisterStringPref(
 938       data_reduction_proxy::prefs::kDataReductionProxy, std::string());
 939   registry->RegisterBooleanPref(prefs::kEnableReferrers, true);
 940   data_reduction_proxy::RegisterPrefs(registry);
 941   registry->RegisterBooleanPref(prefs::kBuiltInDnsClientEnabled, true);
 942   registry->RegisterBooleanPref(prefs::kQuickCheckEnabled, true);
 943 }
 944
 945 net::HttpAuthHandlerFactory* IOThread::CreateDefaultAuthHandlerFactory(
 946     net::HostResolver* resolver) {
 947   net::HttpAuthFilterWhitelist* auth_filter_default_credentials = NULL;
 948   if (!auth_server_whitelist_.empty()) {
 949     auth_filter_default_credentials =
 950         new net::HttpAuthFilterWhitelist(auth_server_whitelist_);
 951   }
 952   net::HttpAuthFilterWhitelist* auth_filter_delegate = NULL;
 953   if (!auth_delegate_whitelist_.empty()) {
 954     auth_filter_delegate =
 955         new net::HttpAuthFilterWhitelist(auth_delegate_whitelist_);
 956   }
 957   globals_->url_security_manager.reset(
 958       net::URLSecurityManager::Create(auth_filter_default_credentials,
 959                                       auth_filter_delegate));
 960   std::vector<std::string> supported_schemes = base::SplitString(
 961       auth_schemes_, ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
 962
 963   scoped_ptr<net::HttpAuthHandlerRegistryFactory> registry_factory(
 964       net::HttpAuthHandlerRegistryFactory::Create(
 965           supported_schemes, globals_->url_security_manager.get(), resolver,
 966           gssapi_library_name_, auth_android_negotiate_account_type_,
 967           negotiate_disable_cname_lookup_, negotiate_enable_port_));
 968   return registry_factory.release();
 969 }
 970
 971 void IOThread::ClearHostCache() {
 972   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 973
 974   net::HostCache* host_cache = globals_->host_resolver->GetHostCache();
 975   if (host_cache)
 976     host_cache->clear();
 977 }
 978
 979 void IOThread::InitializeNetworkSessionParams(
 980     net::HttpNetworkSession::Params* params) {
 981   InitializeNetworkSessionParamsFromGlobals(*globals_, params);
 982 }
 983
 984 void IOThread::InitializeNetworkSessionParamsFromGlobals(
 985     const IOThread::Globals& globals,
 986     net::HttpNetworkSession::Params* params) {
 987   //  The next two properties of the params don't seem to be
 988   // elements of URLRequestContext, so they must be set here.
 989   params->cert_policy_enforcer = globals.cert_policy_enforcer.get();
 990   params->host_mapping_rules = globals.host_mapping_rules.get();
 991
 992   params->ignore_certificate_errors = globals.ignore_certificate_errors;
 993   params->testing_fixed_http_port = globals.testing_fixed_http_port;
 994   params->testing_fixed_https_port = globals.testing_fixed_https_port;
 995   globals.enable_tcp_fast_open_for_ssl.CopyToIfSet(
 996       &params->enable_tcp_fast_open_for_ssl);
 997
 998   globals.initial_max_spdy_concurrent_streams.CopyToIfSet(
 999       &params->spdy_initial_max_concurrent_streams);
1000   globals.enable_spdy_compression.CopyToIfSet(
1001       &params->enable_spdy_compression);
1002   globals.enable_spdy_ping_based_connection_checking.CopyToIfSet(
1003       &params->enable_spdy_ping_based_connection_checking);
1004   globals.spdy_default_protocol.CopyToIfSet(
1005       &params->spdy_default_protocol);
1006   params->next_protos = globals.next_protos;
1007   globals.trusted_spdy_proxy.CopyToIfSet(&params->trusted_spdy_proxy);
1008   params->forced_spdy_exclusions = globals.forced_spdy_exclusions;
1009   globals.use_alternative_services.CopyToIfSet(
1010       &params->use_alternative_services);
1011   globals.alternative_service_probability_threshold.CopyToIfSet(
1012       &params->alternative_service_probability_threshold);
1013
1014   globals.enable_quic.CopyToIfSet(&params->enable_quic);
1015   globals.enable_insecure_quic.CopyToIfSet(&params->enable_insecure_quic);
1016   globals.enable_quic_for_proxies.CopyToIfSet(&params->enable_quic_for_proxies);
1017   globals.quic_always_require_handshake_confirmation.CopyToIfSet(
1018       &params->quic_always_require_handshake_confirmation);
1019   globals.quic_disable_connection_pooling.CopyToIfSet(
1020       &params->quic_disable_connection_pooling);
1021   globals.quic_load_server_info_timeout_srtt_multiplier.CopyToIfSet(
1022       &params->quic_load_server_info_timeout_srtt_multiplier);
1023   globals.quic_enable_connection_racing.CopyToIfSet(
1024       &params->quic_enable_connection_racing);
1025   globals.quic_enable_non_blocking_io.CopyToIfSet(
1026       &params->quic_enable_non_blocking_io);
1027   globals.quic_prefer_aes.CopyToIfSet(&params->quic_prefer_aes);
1028   globals.quic_disable_disk_cache.CopyToIfSet(
1029       &params->quic_disable_disk_cache);
1030   globals.quic_max_number_of_lossy_connections.CopyToIfSet(
1031       &params->quic_max_number_of_lossy_connections);
1032   globals.quic_packet_loss_threshold.CopyToIfSet(
1033       &params->quic_packet_loss_threshold);
1034   globals.quic_socket_receive_buffer_size.CopyToIfSet(
1035       &params->quic_socket_receive_buffer_size);
1036   globals.enable_quic_port_selection.CopyToIfSet(
1037       &params->enable_quic_port_selection);
1038   globals.quic_max_packet_length.CopyToIfSet(&params->quic_max_packet_length);
1039   globals.quic_user_agent_id.CopyToIfSet(&params->quic_user_agent_id);
1040   globals.quic_supported_versions.CopyToIfSet(
1041       &params->quic_supported_versions);
1042   params->quic_connection_options = globals.quic_connection_options;
1043
1044   globals.origin_to_force_quic_on.CopyToIfSet(
1045       &params->origin_to_force_quic_on);
1046   params->enable_user_alternate_protocol_ports =
1047       globals.enable_user_alternate_protocol_ports;
1048 }
1049
1050 base::TimeTicks IOThread::creation_time() const {
1051   return creation_time_;
1052 }
1053
1054 net::SSLConfigService* IOThread::GetSSLConfigService() {
1055   return ssl_config_service_manager_->Get();
1056 }
1057
1058 void IOThread::ChangedToOnTheRecordOnIOThread() {
1059   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
1060
1061   // Clear the host cache to avoid showing entries from the OTR session
1062   // in about:net-internals.
1063   ClearHostCache();
1064 }
1065
1066 void IOThread::InitSystemRequestContext() {
1067   if (system_url_request_context_getter_.get())
1068     return;
1069   // If we're in unit_tests, IOThread may not be run.
1070   if (!BrowserThread::IsMessageLoopValid(BrowserThread::IO))
1071     return;
1072   system_proxy_config_service_.reset(
1073       ProxyServiceFactory::CreateProxyConfigService(
1074           pref_proxy_config_tracker_.get()));
1075   system_url_request_context_getter_ =
1076       new SystemURLRequestContextGetter(this);
1077   // Safe to post an unretained this pointer, since IOThread is
1078   // guaranteed to outlive the IO BrowserThread.
1079   BrowserThread::PostTask(
1080       BrowserThread::IO,
1081       FROM_HERE,
1082       base::Bind(&IOThread::InitSystemRequestContextOnIOThread,
1083                  base::Unretained(this)));
1084 }
1085
1086 void IOThread::InitSystemRequestContextOnIOThread() {
1087   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
1088   DCHECK(!globals_->system_proxy_service.get());
1089   DCHECK(system_proxy_config_service_.get());
1090
1091   const base::CommandLine& command_line =
1092       *base::CommandLine::ForCurrentProcess();
1093   globals_->system_proxy_service.reset(
1094       ProxyServiceFactory::CreateProxyService(
1095           net_log_,
1096           globals_->proxy_script_fetcher_context.get(),
1097           globals_->system_network_delegate.get(),
1098           system_proxy_config_service_.release(),
1099           command_line,
1100           quick_check_enabled_.GetValue()));
1101
1102   globals_->system_request_context.reset(
1103       ConstructSystemRequestContext(globals_, net_log_));
1104 }
1105
1106 void IOThread::UpdateDnsClientEnabled() {
1107   globals()->host_resolver->SetDnsClientEnabled(*dns_client_enabled_);
1108 }
1109
1110 void IOThread::ConfigureQuic(const base::CommandLine& command_line) {
1111   // Always fetch the field trial group to ensure it is reported correctly.
1112   // The command line flags will be associated with a group that is reported
1113   // so long as trial is actually queried.
1114   std::string group =
1115       base::FieldTrialList::FindFullName(kQuicFieldTrialName);
1116   VariationParameters params;
1117   if (!variations::GetVariationParams(kQuicFieldTrialName, &params)) {
1118     params.clear();
1119   }
1120
1121   ConfigureQuicGlobals(command_line, group, params, is_quic_allowed_by_policy_,
1122                        globals_);
1123 }
1124
1125 void IOThread::ConfigureQuicGlobals(
1126     const base::CommandLine& command_line,
1127     base::StringPiece quic_trial_group,
1128     const VariationParameters& quic_trial_params,
1129     bool quic_allowed_by_policy,
1130     IOThread::Globals* globals) {
1131   bool enable_quic = ShouldEnableQuic(command_line, quic_trial_group,
1132                                       quic_allowed_by_policy);
1133   globals->enable_quic.set(enable_quic);
1134   bool enable_quic_for_proxies = ShouldEnableQuicForProxies(
1135       command_line, quic_trial_group, quic_allowed_by_policy);
1136   globals->enable_quic_for_proxies.set(enable_quic_for_proxies);
1137   if (enable_quic) {
1138     globals->enable_insecure_quic.set(
1139         ShouldEnableInsecureQuic(command_line, quic_trial_params));
1140     globals->quic_always_require_handshake_confirmation.set(
1141         ShouldQuicAlwaysRequireHandshakeConfirmation(quic_trial_params));
1142     globals->quic_disable_connection_pooling.set(
1143         ShouldQuicDisableConnectionPooling(quic_trial_params));
1144     int receive_buffer_size = GetQuicSocketReceiveBufferSize(quic_trial_params);
1145     if (receive_buffer_size != 0) {
1146       globals->quic_socket_receive_buffer_size.set(receive_buffer_size);
1147     }
1148     float load_server_info_timeout_srtt_multiplier =
1149         GetQuicLoadServerInfoTimeoutSrttMultiplier(quic_trial_params);
1150     if (load_server_info_timeout_srtt_multiplier != 0) {
1151       globals->quic_load_server_info_timeout_srtt_multiplier.set(
1152           load_server_info_timeout_srtt_multiplier);
1153     }
1154     globals->quic_enable_connection_racing.set(
1155         ShouldQuicEnableConnectionRacing(quic_trial_params));
1156     globals->quic_enable_non_blocking_io.set(
1157         ShouldQuicEnableNonBlockingIO(quic_trial_params));
1158     globals->quic_disable_disk_cache.set(
1159         ShouldQuicDisableDiskCache(quic_trial_params));
1160     globals->quic_prefer_aes.set(
1161         ShouldQuicPreferAes(quic_trial_params));
1162     globals->use_alternative_services.set(
1163         ShouldQuicEnableAlternativeServices(quic_trial_params));
1164     int max_number_of_lossy_connections = GetQuicMaxNumberOfLossyConnections(
1165         quic_trial_params);
1166     if (max_number_of_lossy_connections != 0) {
1167       globals->quic_max_number_of_lossy_connections.set(
1168           max_number_of_lossy_connections);
1169     }
1170     float packet_loss_threshold = GetQuicPacketLossThreshold(quic_trial_params);
1171     if (packet_loss_threshold != 0)
1172       globals->quic_packet_loss_threshold.set(packet_loss_threshold);
1173     globals->enable_quic_port_selection.set(
1174         ShouldEnableQuicPortSelection(command_line));
1175     globals->quic_connection_options =
1176         GetQuicConnectionOptions(command_line, quic_trial_params);
1177   }
1178
1179   size_t max_packet_length = GetQuicMaxPacketLength(command_line,
1180                                                     quic_trial_params);
1181   if (max_packet_length != 0) {
1182     globals->quic_max_packet_length.set(max_packet_length);
1183   }
1184
1185   std::string quic_user_agent_id = chrome::GetChannelString();
1186   if (!quic_user_agent_id.empty())
1187     quic_user_agent_id.push_back(' ');
1188   quic_user_agent_id.append(
1189       version_info::GetProductNameAndVersionForUserAgent());
1190   quic_user_agent_id.push_back(' ');
1191   quic_user_agent_id.append(content::BuildOSCpuInfo());
1192   globals->quic_user_agent_id.set(quic_user_agent_id);
1193
1194   net::QuicVersion version = GetQuicVersion(command_line, quic_trial_params);
1195   if (version != net::QUIC_VERSION_UNSUPPORTED) {
1196     net::QuicVersionVector supported_versions;
1197     supported_versions.push_back(version);
1198     globals->quic_supported_versions.set(supported_versions);
1199   }
1200
1201   double threshold = GetAlternativeProtocolProbabilityThreshold(
1202       command_line, quic_trial_params);
1203   if (threshold >=0 && threshold <= 1) {
1204     globals->alternative_service_probability_threshold.set(threshold);
1205     globals->http_server_properties->SetAlternativeServiceProbabilityThreshold(
1206         threshold);
1207   }
1208
1209   if (command_line.HasSwitch(switches::kOriginToForceQuicOn)) {
1210     net::HostPortPair quic_origin =
1211         net::HostPortPair::FromString(
1212             command_line.GetSwitchValueASCII(switches::kOriginToForceQuicOn));
1213     if (!quic_origin.IsEmpty()) {
1214       globals->origin_to_force_quic_on.set(quic_origin);
1215     }
1216   }
1217 }
1218
1219 bool IOThread::ShouldEnableQuic(const base::CommandLine& command_line,
1220                                 base::StringPiece quic_trial_group,
1221                                 bool quic_allowed_by_policy) {
1222   if (command_line.HasSwitch(switches::kDisableQuic) || !quic_allowed_by_policy)
1223     return false;
1224
1225   if (command_line.HasSwitch(switches::kEnableQuic))
1226     return true;
1227
1228   return quic_trial_group.starts_with(kQuicFieldTrialEnabledGroupName) ||
1229       quic_trial_group.starts_with(kQuicFieldTrialHttpsEnabledGroupName);
1230 }
1231
1232 bool IOThread::ShouldEnableQuicForProxies(const base::CommandLine& command_line,
1233                                           base::StringPiece quic_trial_group,
1234                                           bool quic_allowed_by_policy) {
1235   return ShouldEnableQuic(
1236       command_line, quic_trial_group, quic_allowed_by_policy) ||
1237       ShouldEnableQuicForDataReductionProxy();
1238 }
1239
1240 bool IOThread::ShouldEnableQuicForDataReductionProxy() {
1241   const base::CommandLine& command_line =
1242         *base::CommandLine::ForCurrentProcess();
1243
1244   if (command_line.HasSwitch(switches::kDisableQuic))
1245     return false;
1246
1247   return data_reduction_proxy::params::IsIncludedInQuicFieldTrial();
1248 }
1249
1250 bool IOThread::ShouldEnableInsecureQuic(
1251     const base::CommandLine& command_line,
1252     const VariationParameters& quic_trial_params) {
1253   if (command_line.HasSwitch(switches::kEnableInsecureQuic))
1254     return true;
1255
1256   return base::LowerCaseEqualsASCII(
1257       GetVariationParam(quic_trial_params, "enable_insecure_quic"),
1258       "true");
1259 }
1260
1261 bool IOThread::ShouldEnableQuicPortSelection(
1262     const base::CommandLine& command_line) {
1263   if (command_line.HasSwitch(switches::kDisableQuicPortSelection))
1264     return false;
1265
1266   if (command_line.HasSwitch(switches::kEnableQuicPortSelection))
1267     return true;
1268
1269   return false;  // Default to disabling port selection on all channels.
1270 }
1271
1272 net::QuicTagVector IOThread::GetQuicConnectionOptions(
1273     const base::CommandLine& command_line,
1274     const VariationParameters& quic_trial_params) {
1275   if (command_line.HasSwitch(switches::kQuicConnectionOptions)) {
1276     return net::QuicUtils::ParseQuicConnectionOptions(
1277         command_line.GetSwitchValueASCII(switches::kQuicConnectionOptions));
1278   }
1279
1280   VariationParameters::const_iterator it =
1281       quic_trial_params.find("connection_options");
1282   if (it == quic_trial_params.end()) {
1283     return net::QuicTagVector();
1284   }
1285
1286   return net::QuicUtils::ParseQuicConnectionOptions(it->second);
1287 }
1288
1289 double IOThread::GetAlternativeProtocolProbabilityThreshold(
1290     const base::CommandLine& command_line,
1291     const VariationParameters& quic_trial_params) {
1292   double value;
1293   if (command_line.HasSwitch(
1294           switches::kAlternativeServiceProbabilityThreshold)) {
1295     if (base::StringToDouble(
1296             command_line.GetSwitchValueASCII(
1297                 switches::kAlternativeServiceProbabilityThreshold),
1298             &value)) {
1299       return value;
1300     }
1301   }
1302   if (command_line.HasSwitch(switches::kEnableQuic)) {
1303     return 0;
1304   }
1305   // TODO(bnc): Remove when new parameter name rolls out and server
1306   // configuration is changed.
1307   if (base::StringToDouble(
1308           GetVariationParam(quic_trial_params,
1309                             "alternate_protocol_probability_threshold"),
1310           &value)) {
1311     return value;
1312   }
1313   if (base::StringToDouble(
1314           GetVariationParam(quic_trial_params,
1315                             "alternative_service_probability_threshold"),
1316           &value)) {
1317     return value;
1318   }
1319   return -1;
1320 }
1321
1322 bool IOThread::ShouldQuicAlwaysRequireHandshakeConfirmation(
1323     const VariationParameters& quic_trial_params) {
1324   return base::LowerCaseEqualsASCII(
1325       GetVariationParam(quic_trial_params,
1326                         "always_require_handshake_confirmation"),
1327       "true");
1328 }
1329
1330 bool IOThread::ShouldQuicDisableConnectionPooling(
1331     const VariationParameters& quic_trial_params) {
1332   return base::LowerCaseEqualsASCII(
1333       GetVariationParam(quic_trial_params, "disable_connection_pooling"),
1334       "true");
1335 }
1336
1337 float IOThread::GetQuicLoadServerInfoTimeoutSrttMultiplier(
1338     const VariationParameters& quic_trial_params) {
1339   double value;
1340   if (base::StringToDouble(GetVariationParam(quic_trial_params,
1341                                              "load_server_info_time_to_srtt"),
1342                            &value)) {
1343     return static_cast<float>(value);
1344   }
1345   return 0.0f;
1346 }
1347
1348 bool IOThread::ShouldQuicEnableConnectionRacing(
1349     const VariationParameters& quic_trial_params) {
1350   return base::LowerCaseEqualsASCII(
1351       GetVariationParam(quic_trial_params, "enable_connection_racing"),
1352       "true");
1353 }
1354
1355 bool IOThread::ShouldQuicEnableNonBlockingIO(
1356     const VariationParameters& quic_trial_params) {
1357   return base::LowerCaseEqualsASCII(
1358       GetVariationParam(quic_trial_params, "enable_non_blocking_io"),
1359       "true");
1360 }
1361
1362 bool IOThread::ShouldQuicDisableDiskCache(
1363     const VariationParameters& quic_trial_params) {
1364   return base::LowerCaseEqualsASCII(
1365       GetVariationParam(quic_trial_params, "disable_disk_cache"), "true");
1366 }
1367
1368 bool IOThread::ShouldQuicPreferAes(
1369     const VariationParameters& quic_trial_params) {
1370   return base::LowerCaseEqualsASCII(
1371       GetVariationParam(quic_trial_params, "prefer_aes"), "true");
1372 }
1373
1374 bool IOThread::ShouldQuicEnableAlternativeServices(
1375     const VariationParameters& quic_trial_params) {
1376   return base::LowerCaseEqualsASCII(
1377       GetVariationParam(quic_trial_params, "use_alternative_services"), "true");
1378 }
1379
1380 int IOThread::GetQuicMaxNumberOfLossyConnections(
1381     const VariationParameters& quic_trial_params) {
1382   int value;
1383   if (base::StringToInt(GetVariationParam(quic_trial_params,
1384                                           "max_number_of_lossy_connections"),
1385                         &value)) {
1386     return value;
1387   }
1388   return 0;
1389 }
1390
1391 float IOThread::GetQuicPacketLossThreshold(
1392     const VariationParameters& quic_trial_params) {
1393   double value;
1394   if (base::StringToDouble(GetVariationParam(quic_trial_params,
1395                                              "packet_loss_threshold"),
1396                            &value)) {
1397     return static_cast<float>(value);
1398   }
1399   return 0.0f;
1400 }
1401
1402 int IOThread::GetQuicSocketReceiveBufferSize(
1403     const VariationParameters& quic_trial_params) {
1404   int value;
1405   if (base::StringToInt(GetVariationParam(quic_trial_params,
1406                                           "receive_buffer_size"),
1407                         &value)) {
1408     return value;
1409   }
1410   return 0;
1411 }
1412
1413 size_t IOThread::GetQuicMaxPacketLength(
1414     const base::CommandLine& command_line,
1415     const VariationParameters& quic_trial_params) {
1416   if (command_line.HasSwitch(switches::kQuicMaxPacketLength)) {
1417     unsigned value;
1418     if (!base::StringToUint(
1419             command_line.GetSwitchValueASCII(switches::kQuicMaxPacketLength),
1420             &value)) {
1421       return 0;
1422     }
1423     return value;
1424   }
1425
1426   unsigned value;
1427   if (base::StringToUint(GetVariationParam(quic_trial_params,
1428                                            "max_packet_length"),
1429                          &value)) {
1430     return value;
1431   }
1432   return 0;
1433 }
1434
1435 net::QuicVersion IOThread::GetQuicVersion(
1436     const base::CommandLine& command_line,
1437     const VariationParameters& quic_trial_params) {
1438   if (command_line.HasSwitch(switches::kQuicVersion)) {
1439     return ParseQuicVersion(
1440         command_line.GetSwitchValueASCII(switches::kQuicVersion));
1441   }
1442
1443   return ParseQuicVersion(GetVariationParam(quic_trial_params, "quic_version"));
1444 }
1445
1446 net::QuicVersion IOThread::ParseQuicVersion(const std::string& quic_version) {
1447   net::QuicVersionVector supported_versions = net::QuicSupportedVersions();
1448   for (size_t i = 0; i < supported_versions.size(); ++i) {
1449     net::QuicVersion version = supported_versions[i];
1450     if (net::QuicVersionToString(version) == quic_version) {
1451       return version;
1452     }
1453   }
1454
1455   return net::QUIC_VERSION_UNSUPPORTED;
1456 }
1457
1458 net::URLRequestContext* IOThread::ConstructSystemRequestContext(
1459     IOThread::Globals* globals,
1460     net::NetLog* net_log) {
1461   net::URLRequestContext* context = new SystemURLRequestContext;
1462   context->set_net_log(net_log);
1463   context->set_host_resolver(globals->host_resolver.get());
1464   context->set_cert_verifier(globals->cert_verifier.get());
1465   context->set_transport_security_state(
1466       globals->transport_security_state.get());
1467   context->set_cert_transparency_verifier(
1468       globals->cert_transparency_verifier.get());
1469   context->set_ssl_config_service(globals->ssl_config_service.get());
1470   context->set_http_auth_handler_factory(
1471       globals->http_auth_handler_factory.get());
1472   context->set_proxy_service(globals->system_proxy_service.get());
1473
1474   globals->system_url_request_job_factory.reset(
1475       new net::URLRequestJobFactoryImpl());
1476   context->set_job_factory(globals->system_url_request_job_factory.get());
1477
1478   context->set_cookie_store(globals->system_cookie_store.get());
1479   context->set_channel_id_service(
1480       globals->system_channel_id_service.get());
1481   context->set_network_delegate(globals->system_network_delegate.get());
1482   context->set_http_user_agent_settings(
1483       globals->http_user_agent_settings.get());
1484   context->set_network_quality_estimator(
1485       globals->network_quality_estimator.get());
1486   context->set_backoff_manager(globals->url_request_backoff_manager.get());
1487
1488   context->set_http_server_properties(
1489       globals->http_server_properties->GetWeakPtr());
1490
1491   net::HttpNetworkSession::Params system_params;
1492   InitializeNetworkSessionParamsFromGlobals(*globals, &system_params);
1493   net::URLRequestContextBuilder::SetHttpNetworkSessionComponents(
1494       context, &system_params);
1495
1496   globals->system_http_transaction_factory.reset(
1497       new net::HttpNetworkLayer(new net::HttpNetworkSession(system_params)));
1498   context->set_http_transaction_factory(
1499       globals->system_http_transaction_factory.get());
1500
1501   return context;
1502 }
1503
1504 net::URLRequestContext* IOThread::ConstructProxyScriptFetcherContext(
1505     IOThread::Globals* globals,
1506     net::NetLog* net_log) {
1507   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
1508   // is fixed.
1509   tracked_objects::ScopedTracker tracking_profile1(
1510       FROM_HERE_WITH_EXPLICIT_FUNCTION(
1511           "466432 IOThread::ConstructProxyScriptFetcherContext1"));
1512   net::URLRequestContext* context = new net::URLRequestContext;
1513   context->set_net_log(net_log);
1514   context->set_host_resolver(globals->host_resolver.get());
1515   context->set_cert_verifier(globals->cert_verifier.get());
1516   context->set_transport_security_state(
1517       globals->transport_security_state.get());
1518   context->set_cert_transparency_verifier(
1519       globals->cert_transparency_verifier.get());
1520   context->set_ssl_config_service(globals->ssl_config_service.get());
1521   context->set_http_auth_handler_factory(
1522       globals->http_auth_handler_factory.get());
1523   context->set_proxy_service(globals->proxy_script_fetcher_proxy_service.get());
1524
1525   context->set_job_factory(
1526       globals->proxy_script_fetcher_url_request_job_factory.get());
1527
1528   context->set_cookie_store(globals->system_cookie_store.get());
1529   context->set_channel_id_service(
1530       globals->system_channel_id_service.get());
1531   context->set_network_delegate(globals->system_network_delegate.get());
1532   context->set_http_user_agent_settings(
1533       globals->http_user_agent_settings.get());
1534   context->set_http_server_properties(
1535       globals->http_server_properties->GetWeakPtr());
1536
1537   net::HttpNetworkSession::Params session_params;
1538   InitializeNetworkSessionParamsFromGlobals(*globals, &session_params);
1539   net::URLRequestContextBuilder::SetHttpNetworkSessionComponents(
1540       context, &session_params);
1541
1542   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
1543   // is fixed.
1544   tracked_objects::ScopedTracker tracking_profile2(
1545       FROM_HERE_WITH_EXPLICIT_FUNCTION(
1546           "466432 IOThread::ConstructProxyScriptFetcherContext2"));
1547   scoped_refptr<net::HttpNetworkSession> network_session(
1548       new net::HttpNetworkSession(session_params));
1549   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
1550   // is fixed.
1551   tracked_objects::ScopedTracker tracking_profile3(
1552       FROM_HERE_WITH_EXPLICIT_FUNCTION(
1553           "466432 IOThread::ConstructProxyScriptFetcherContext3"));
1554   globals->proxy_script_fetcher_http_transaction_factory
1555       .reset(new net::HttpNetworkLayer(network_session.get()));
1556   context->set_http_transaction_factory(
1557       globals->proxy_script_fetcher_http_transaction_factory.get());
1558
1559   scoped_ptr<net::URLRequestJobFactoryImpl> job_factory(
1560       new net::URLRequestJobFactoryImpl());
1561
1562   job_factory->SetProtocolHandler(
1563       url::kDataScheme, make_scoped_ptr(new net::DataProtocolHandler()));
1564   job_factory->SetProtocolHandler(
1565       url::kFileScheme,
1566       make_scoped_ptr(new net::FileProtocolHandler(
1567           content::BrowserThread::GetBlockingPool()
1568               ->GetTaskRunnerWithShutdownBehavior(
1569                   base::SequencedWorkerPool::SKIP_ON_SHUTDOWN))));
1570 #if !defined(DISABLE_FTP_SUPPORT)
1571   globals->proxy_script_fetcher_ftp_transaction_factory.reset(
1572       new net::FtpNetworkLayer(globals->host_resolver.get()));
1573   job_factory->SetProtocolHandler(
1574       url::kFtpScheme,
1575       make_scoped_ptr(new net::FtpProtocolHandler(
1576           globals->proxy_script_fetcher_ftp_transaction_factory.get())));
1577 #endif
1578   globals->proxy_script_fetcher_url_request_job_factory = job_factory.Pass();
1579
1580   context->set_job_factory(
1581       globals->proxy_script_fetcher_url_request_job_factory.get());
1582
1583   // TODO(rtenneti): We should probably use HttpServerPropertiesManager for the
1584   // system URLRequestContext too. There's no reason this should be tied to a
1585   // profile.
1586   return context;
1587 }