content/browser/browser_main_loop.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 "content/browser/browser_main_loop.h"
   6
   7 #include "base/bind.h"
   8 #include "base/command_line.h"
   9 #include "base/debug/trace_event.h"
  10 #include "base/file_util.h"
  11 #include "base/logging.h"
  12 #include "base/message_loop/message_loop.h"
  13 #include "base/metrics/field_trial.h"
  14 #include "base/metrics/histogram.h"
  15 #include "base/path_service.h"
  16 #include "base/pending_task.h"
  17 #include "base/power_monitor/power_monitor.h"
  18 #include "base/power_monitor/power_monitor_device_source.h"
  19 #include "base/process/process_metrics.h"
  20 #include "base/run_loop.h"
  21 #include "base/strings/string_number_conversions.h"
  22 #include "base/system_monitor/system_monitor.h"
  23 #include "base/thread_task_runner_handle.h"
  24 #include "base/threading/thread_restrictions.h"
  25 #include "base/timer/hi_res_timer_manager.h"
  26 #include "content/browser/browser_thread_impl.h"
  27 #include "content/browser/device_orientation/device_inertial_sensor_service.h"
  28 #include "content/browser/download/save_file_manager.h"
  29 #include "content/browser/gamepad/gamepad_service.h"
  30 #include "content/browser/gpu/browser_gpu_channel_host_factory.h"
  31 #include "content/browser/gpu/compositor_util.h"
  32 #include "content/browser/gpu/gpu_data_manager_impl.h"
  33 #include "content/browser/gpu/gpu_process_host.h"
  34 #include "content/browser/gpu/gpu_process_host_ui_shim.h"
  35 #include "content/browser/histogram_synchronizer.h"
  36 #include "content/browser/loader/resource_dispatcher_host_impl.h"
  37 #include "content/browser/media/media_internals.h"
  38 #include "content/browser/net/browser_online_state_observer.h"
  39 #include "content/browser/plugin_service_impl.h"
  40 #include "content/browser/renderer_host/media/audio_mirroring_manager.h"
  41 #include "content/browser/renderer_host/media/media_stream_manager.h"
  42 #include "content/browser/renderer_host/render_process_host_impl.h"
  43 #include "content/browser/speech/speech_recognition_manager_impl.h"
  44 #include "content/browser/startup_task_runner.h"
  45 #include "content/browser/webui/content_web_ui_controller_factory.h"
  46 #include "content/browser/webui/url_data_manager.h"
  47 #include "content/public/browser/browser_main_parts.h"
  48 #include "content/public/browser/browser_shutdown.h"
  49 #include "content/public/browser/content_browser_client.h"
  50 #include "content/public/browser/render_process_host.h"
  51 #include "content/public/browser/tracing_controller.h"
  52 #include "content/public/common/content_switches.h"
  53 #include "content/public/common/main_function_params.h"
  54 #include "content/public/common/result_codes.h"
  55 #include "crypto/nss_util.h"
  56 #include "media/audio/audio_manager.h"
  57 #include "media/base/media.h"
  58 #include "media/base/user_input_monitor.h"
  59 #include "media/midi/midi_manager.h"
  60 #include "net/base/network_change_notifier.h"
  61 #include "net/socket/client_socket_factory.h"
  62 #include "net/ssl/ssl_config_service.h"
  63 #include "ui/base/clipboard/clipboard.h"
  64
  65 #if defined(USE_AURA)
  66 #include "content/browser/aura/image_transport_factory.h"
  67 #endif
  68
  69 #if defined(OS_ANDROID)
  70 #include "base/android/jni_android.h"
  71 #include "content/browser/android/browser_startup_controller.h"
  72 #include "content/browser/android/surface_texture_peer_browser_impl.h"
  73 #endif
  74
  75 #if defined(OS_MACOSX)
  76 #include "content/browser/theme_helper_mac.h"
  77 #endif
  78
  79 #if defined(OS_WIN)
  80 #include <windows.h>
  81 #include <commctrl.h>
  82 #include <shellapi.h>
  83
  84 #include "base/win/text_services_message_filter.h"
  85 #include "content/browser/system_message_window_win.h"
  86 #include "content/common/sandbox_win.h"
  87 #include "net/base/winsock_init.h"
  88 #include "ui/base/l10n/l10n_util_win.h"
  89 #endif
  90
  91 #if defined(USE_GLIB)
  92 #include <glib-object.h>
  93 #endif
  94
  95 #if defined(OS_LINUX) && defined(USE_UDEV)
  96 #include "content/browser/device_monitor_udev.h"
  97 #elif defined(OS_MACOSX) && !defined(OS_IOS)
  98 #include "content/browser/device_monitor_mac.h"
  99 #endif
 100
 101 #if defined(TOOLKIT_GTK)
 102 #include "ui/gfx/gtk_util.h"
 103 #endif
 104
 105 #if defined(OS_POSIX) && !defined(OS_MACOSX)
 106 #include <sys/stat.h>
 107
 108 #include "content/browser/renderer_host/render_sandbox_host_linux.h"
 109 #include "content/browser/zygote_host/zygote_host_impl_linux.h"
 110 #endif
 111
 112 #if defined(TCMALLOC_TRACE_MEMORY_SUPPORTED)
 113 #include "third_party/tcmalloc/chromium/src/gperftools/heap-profiler.h"
 114 #endif
 115
 116 #if defined(USE_X11)
 117 #include <X11/Xlib.h>
 118 #endif
 119
 120 // One of the linux specific headers defines this as a macro.
 121 #ifdef DestroyAll
 122 #undef DestroyAll
 123 #endif
 124
 125 namespace content {
 126 namespace {
 127
 128 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 129 void SetupSandbox(const CommandLine& parsed_command_line) {
 130   TRACE_EVENT0("startup", "SetupSandbox");
 131   // TODO(evanm): move this into SandboxWrapper; I'm just trying to move this
 132   // code en masse out of chrome_main for now.
 133   base::FilePath sandbox_binary;
 134   bool env_chrome_devel_sandbox_set = false;
 135   struct stat st;
 136
 137   const bool want_setuid_sandbox =
 138       !parsed_command_line.HasSwitch(switches::kNoSandbox) &&
 139       !parsed_command_line.HasSwitch(switches::kDisableSetuidSandbox);
 140
 141   if (want_setuid_sandbox) {
 142     base::FilePath exe_dir;
 143     if (PathService::Get(base::DIR_EXE, &exe_dir)) {
 144       base::FilePath sandbox_candidate = exe_dir.AppendASCII("chrome-sandbox");
 145       if (base::PathExists(sandbox_candidate))
 146         sandbox_binary = sandbox_candidate;
 147     }
 148
 149     // In user-managed builds, including development builds, an environment
 150     // variable is required to enable the sandbox. See
 151     // http://code.google.com/p/chromium/wiki/LinuxSUIDSandboxDevelopment
 152     if (sandbox_binary.empty() &&
 153         stat(base::kProcSelfExe, &st) == 0 && st.st_uid == getuid()) {
 154       const char* devel_sandbox_path = getenv("CHROME_DEVEL_SANDBOX");
 155       if (devel_sandbox_path) {
 156         env_chrome_devel_sandbox_set = true;
 157         sandbox_binary = base::FilePath(devel_sandbox_path);
 158       }
 159     }
 160
 161     static const char no_suid_error[] = "Running without the SUID sandbox! See "
 162         "https://code.google.com/p/chromium/wiki/LinuxSUIDSandboxDevelopment "
 163         "for more information on developing with the sandbox on.";
 164     if (sandbox_binary.empty()) {
 165       if (!env_chrome_devel_sandbox_set) {
 166         // This needs to be fatal. Talk to security@chromium.org if you feel
 167         // otherwise.
 168         LOG(FATAL) << no_suid_error;
 169       }
 170
 171       // TODO(jln): an empty CHROME_DEVEL_SANDBOX environment variable (as
 172       // opposed to a non existing one) is not fatal yet. This is needed
 173       // because of existing bots and scripts. Fix it (crbug.com/245376).
 174       LOG(ERROR) << no_suid_error;
 175     }
 176   }
 177
 178   // Tickle the sandbox host and zygote host so they fork now.
 179   RenderSandboxHostLinux::GetInstance()->Init(sandbox_binary.value());
 180   ZygoteHostImpl::GetInstance()->Init(sandbox_binary.value());
 181 }
 182 #endif
 183
 184 #if defined(USE_GLIB)
 185 static void GLibLogHandler(const gchar* log_domain,
 186                            GLogLevelFlags log_level,
 187                            const gchar* message,
 188                            gpointer userdata) {
 189   if (!log_domain)
 190     log_domain = "<unknown>";
 191   if (!message)
 192     message = "<no message>";
 193
 194   if (strstr(message, "Loading IM context type") ||
 195       strstr(message, "wrong ELF class: ELFCLASS64")) {
 196     // http://crbug.com/9643
 197     // Until we have a real 64-bit build or all of these 32-bit package issues
 198     // are sorted out, don't fatal on ELF 32/64-bit mismatch warnings and don't
 199     // spam the user with more than one of them.
 200     static bool alerted = false;
 201     if (!alerted) {
 202       LOG(ERROR) << "Bug 9643: " << log_domain << ": " << message;
 203       alerted = true;
 204     }
 205   } else if (strstr(message, "Unable to retrieve the file info for")) {
 206     LOG(ERROR) << "GTK File code error: " << message;
 207   } else if (strstr(message, "Could not find the icon") &&
 208              strstr(log_domain, "Gtk")) {
 209     LOG(ERROR) << "GTK icon error: " << message;
 210   } else if (strstr(message, "Theme file for default has no") ||
 211              strstr(message, "Theme directory") ||
 212              strstr(message, "theme pixmap") ||
 213              strstr(message, "locate theme engine")) {
 214     LOG(ERROR) << "GTK theme error: " << message;
 215   } else if (strstr(message, "Unable to create Ubuntu Menu Proxy") &&
 216              strstr(log_domain, "<unknown>")) {
 217     LOG(ERROR) << "GTK menu proxy create failed";
 218   } else if (strstr(message, "gtk_drag_dest_leave: assertion")) {
 219     LOG(ERROR) << "Drag destination deleted: http://crbug.com/18557";
 220   } else if (strstr(message, "Out of memory") &&
 221              strstr(log_domain, "<unknown>")) {
 222     LOG(ERROR) << "DBus call timeout or out of memory: "
 223                << "http://crosbug.com/15496";
 224   } else if (strstr(message, "Could not connect: Connection refused") &&
 225              strstr(log_domain, "<unknown>")) {
 226     LOG(ERROR) << "DConf settings backend could not connect to session bus: "
 227                << "http://crbug.com/179797";
 228   } else if (strstr(message, "XDG_RUNTIME_DIR variable not set")) {
 229     LOG(ERROR) << message << " (http://bugs.chromium.org/97293)";
 230   } else if (strstr(message, "Attempting to store changes into") ||
 231              strstr(message, "Attempting to set the permissions of")) {
 232     LOG(ERROR) << message << " (http://bugs.chromium.org/161366)";
 233   } else if (strstr(message, "drawable is not a native X11 window")) {
 234     LOG(ERROR) << message << " (http://bugs.chromium.org/329991)";
 235   } else {
 236     LOG(DFATAL) << log_domain << ": " << message;
 237   }
 238 }
 239
 240 static void SetUpGLibLogHandler() {
 241   // Register GLib-handled assertions to go through our logging system.
 242   const char* kLogDomains[] = { NULL, "Gtk", "Gdk", "GLib", "GLib-GObject" };
 243   for (size_t i = 0; i < arraysize(kLogDomains); i++) {
 244     g_log_set_handler(kLogDomains[i],
 245                       static_cast<GLogLevelFlags>(G_LOG_FLAG_RECURSION |
 246                                                   G_LOG_FLAG_FATAL |
 247                                                   G_LOG_LEVEL_ERROR |
 248                                                   G_LOG_LEVEL_CRITICAL |
 249                                                   G_LOG_LEVEL_WARNING),
 250                       GLibLogHandler,
 251                       NULL);
 252   }
 253 }
 254 #endif
 255
 256 }  // namespace
 257
 258 // The currently-running BrowserMainLoop.  There can be one or zero.
 259 BrowserMainLoop* g_current_browser_main_loop = NULL;
 260
 261 // This is just to be able to keep ShutdownThreadsAndCleanUp out of
 262 // the public interface of BrowserMainLoop.
 263 class BrowserShutdownImpl {
 264  public:
 265   static void ImmediateShutdownAndExitProcess() {
 266     DCHECK(g_current_browser_main_loop);
 267     g_current_browser_main_loop->ShutdownThreadsAndCleanUp();
 268
 269 #if defined(OS_WIN)
 270     // At this point the message loop is still running yet we've shut everything
 271     // down. If any messages are processed we'll likely crash. Exit now.
 272     ExitProcess(RESULT_CODE_NORMAL_EXIT);
 273 #elif defined(OS_POSIX) && !defined(OS_MACOSX)
 274     _exit(RESULT_CODE_NORMAL_EXIT);
 275 #else
 276     NOTIMPLEMENTED();
 277 #endif
 278   }
 279 };
 280
 281 void ImmediateShutdownAndExitProcess() {
 282   BrowserShutdownImpl::ImmediateShutdownAndExitProcess();
 283 }
 284
 285 // For measuring memory usage after each task. Behind a command line flag.
 286 class BrowserMainLoop::MemoryObserver : public base::MessageLoop::TaskObserver {
 287  public:
 288   MemoryObserver() {}
 289   virtual ~MemoryObserver() {}
 290
 291   virtual void WillProcessTask(const base::PendingTask& pending_task) OVERRIDE {
 292   }
 293
 294   virtual void DidProcessTask(const base::PendingTask& pending_task) OVERRIDE {
 295 #if !defined(OS_IOS)  // No ProcessMetrics on IOS.
 296     scoped_ptr<base::ProcessMetrics> process_metrics(
 297         base::ProcessMetrics::CreateProcessMetrics(
 298 #if defined(OS_MACOSX)
 299             base::GetCurrentProcessHandle(), NULL));
 300 #else
 301             base::GetCurrentProcessHandle()));
 302 #endif
 303     size_t private_bytes;
 304     process_metrics->GetMemoryBytes(&private_bytes, NULL);
 305     HISTOGRAM_MEMORY_KB("Memory.BrowserUsed", private_bytes >> 10);
 306 #endif
 307   }
 308  private:
 309   DISALLOW_COPY_AND_ASSIGN(MemoryObserver);
 310 };
 311
 312
 313 // BrowserMainLoop construction / destruction =============================
 314
 315 BrowserMainLoop* BrowserMainLoop::GetInstance() {
 316   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 317   return g_current_browser_main_loop;
 318 }
 319
 320 BrowserMainLoop::BrowserMainLoop(const MainFunctionParams& parameters)
 321     : parameters_(parameters),
 322       parsed_command_line_(parameters.command_line),
 323       result_code_(RESULT_CODE_NORMAL_EXIT),
 324       created_threads_(false),
 325       // ContentMainRunner should have enabled tracing of the browser process
 326       // when kTraceStartup is in the command line.
 327       is_tracing_startup_(base::debug::TraceLog::GetInstance()->IsEnabled()) {
 328   DCHECK(!g_current_browser_main_loop);
 329   g_current_browser_main_loop = this;
 330 }
 331
 332 BrowserMainLoop::~BrowserMainLoop() {
 333   DCHECK_EQ(this, g_current_browser_main_loop);
 334 #if !defined(OS_IOS)
 335   ui::Clipboard::DestroyClipboardForCurrentThread();
 336 #endif  // !defined(OS_IOS)
 337   g_current_browser_main_loop = NULL;
 338 }
 339
 340 void BrowserMainLoop::Init() {
 341   TRACE_EVENT0("startup", "BrowserMainLoop::Init")
 342   parts_.reset(
 343       GetContentClient()->browser()->CreateBrowserMainParts(parameters_));
 344 }
 345
 346 // BrowserMainLoop stages ==================================================
 347
 348 void BrowserMainLoop::EarlyInitialization() {
 349   TRACE_EVENT0("startup", "BrowserMainLoop::EarlyInitialization");
 350
 351 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 352   // No thread should be created before this call, as SetupSandbox()
 353   // will end-up using fork().
 354   SetupSandbox(parsed_command_line_);
 355 #endif
 356
 357 #if defined(USE_X11)
 358   if (parsed_command_line_.HasSwitch(switches::kSingleProcess) ||
 359       parsed_command_line_.HasSwitch(switches::kInProcessGPU)) {
 360     if (!XInitThreads()) {
 361       LOG(ERROR) << "Failed to put Xlib into threaded mode.";
 362     }
 363   }
 364 #endif
 365
 366   // GLib's spawning of new processes is buggy, so it's important that at this
 367   // point GLib does not need to start DBUS. Chrome should always start with
 368   // DBUS_SESSION_BUS_ADDRESS properly set. See crbug.com/309093.
 369 #if defined(USE_GLIB)
 370   // g_type_init will be deprecated in 2.36. 2.35 is the development
 371   // version for 2.36, hence do not call g_type_init starting 2.35.
 372   // http://developer.gnome.org/gobject/unstable/gobject-Type-Information.html#g-type-init
 373 #if !GLIB_CHECK_VERSION(2, 35, 0)
 374   // GLib type system initialization. Needed at least for gconf,
 375   // used in net/proxy/proxy_config_service_linux.cc. Most likely
 376   // this is superfluous as gtk_init() ought to do this. It's
 377   // definitely harmless, so retained as a reminder of this
 378   // requirement for gconf.
 379   g_type_init();
 380 #endif
 381
 382 #if !defined(USE_AURA)
 383   gfx::GtkInitFromCommandLine(parsed_command_line_);
 384 #endif
 385
 386   SetUpGLibLogHandler();
 387 #endif
 388
 389   if (parts_)
 390     parts_->PreEarlyInitialization();
 391
 392 #if defined(OS_WIN)
 393   net::EnsureWinsockInit();
 394 #endif
 395
 396 #if !defined(USE_OPENSSL)
 397   // We want to be sure to init NSPR on the main thread.
 398   crypto::EnsureNSPRInit();
 399 #endif  // !defined(USE_OPENSSL)
 400
 401   if (parsed_command_line_.HasSwitch(switches::kEnableSSLCachedInfo))
 402     net::SSLConfigService::EnableCachedInfo();
 403
 404 #if !defined(OS_IOS)
 405   if (parsed_command_line_.HasSwitch(switches::kRendererProcessLimit)) {
 406     std::string limit_string = parsed_command_line_.GetSwitchValueASCII(
 407         switches::kRendererProcessLimit);
 408     size_t process_limit;
 409     if (base::StringToSizeT(limit_string, &process_limit)) {
 410       RenderProcessHost::SetMaxRendererProcessCount(process_limit);
 411     }
 412   }
 413 #endif  // !defined(OS_IOS)
 414
 415   if (parts_)
 416     parts_->PostEarlyInitialization();
 417 }
 418
 419 void BrowserMainLoop::MainMessageLoopStart() {
 420   TRACE_EVENT0("startup", "BrowserMainLoop::MainMessageLoopStart")
 421   if (parts_) {
 422     TRACE_EVENT0("startup",
 423         "BrowserMainLoop::MainMessageLoopStart:PreMainMessageLoopStart");
 424     parts_->PreMainMessageLoopStart();
 425   }
 426
 427 #if defined(OS_WIN)
 428   // If we're running tests (ui_task is non-null), then the ResourceBundle
 429   // has already been initialized.
 430   if (!parameters_.ui_task) {
 431     // Override the configured locale with the user's preferred UI language.
 432     l10n_util::OverrideLocaleWithUILanguageList();
 433   }
 434 #endif
 435
 436   // Create a MessageLoop if one does not already exist for the current thread.
 437   if (!base::MessageLoop::current())
 438     main_message_loop_.reset(new base::MessageLoopForUI);
 439
 440   InitializeMainThread();
 441
 442   {
 443     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:SystemMonitor")
 444     system_monitor_.reset(new base::SystemMonitor);
 445   }
 446   {
 447     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:PowerMonitor")
 448     scoped_ptr<base::PowerMonitorSource> power_monitor_source(
 449       new base::PowerMonitorDeviceSource());
 450     power_monitor_.reset(new base::PowerMonitor(power_monitor_source.Pass()));
 451   }
 452   {
 453     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:HighResTimerManager")
 454     hi_res_timer_manager_.reset(new base::HighResolutionTimerManager);
 455   }
 456   {
 457     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:NetworkChangeNotifier")
 458     network_change_notifier_.reset(net::NetworkChangeNotifier::Create());
 459   }
 460
 461 #if !defined(OS_IOS)
 462   {
 463     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:MediaFeatures")
 464     media::InitializeCPUSpecificMediaFeatures();
 465   }
 466   {
 467     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:AudioMan")
 468     audio_manager_.reset(media::AudioManager::Create(
 469         MediaInternals::GetInstance()));
 470   }
 471   {
 472     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:MIDIManager")
 473     midi_manager_.reset(media::MIDIManager::Create());
 474   }
 475   {
 476     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:ContentWebUIController")
 477     WebUIControllerFactory::RegisterFactory(
 478         ContentWebUIControllerFactory::GetInstance());
 479   }
 480
 481   {
 482     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:AudioMirroringManager")
 483     audio_mirroring_manager_.reset(new AudioMirroringManager());
 484   }
 485
 486   // Start tracing to a file if needed.
 487   if (is_tracing_startup_) {
 488     TRACE_EVENT0("startup", "BrowserMainLoop::InitStartupTracing")
 489     InitStartupTracing(parsed_command_line_);
 490   }
 491
 492   {
 493     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:OnlineStateObserver")
 494     online_state_observer_.reset(new BrowserOnlineStateObserver);
 495   }
 496
 497   {
 498     system_stats_monitor_.reset(new base::debug::TraceEventSystemStatsMonitor(
 499         base::ThreadTaskRunnerHandle::Get()));
 500   }
 501 #endif  // !defined(OS_IOS)
 502
 503 #if defined(OS_WIN)
 504   system_message_window_.reset(new SystemMessageWindowWin);
 505
 506   if (base::win::IsTSFAwareRequired()) {
 507     // Create a TSF message filter for the message loop. MessageLoop takes
 508     // ownership of the filter.
 509     scoped_ptr<base::win::TextServicesMessageFilter> tsf_message_filter(
 510       new base::win::TextServicesMessageFilter);
 511     if (tsf_message_filter->Init()) {
 512       base::MessageLoopForUI::current()->SetMessageFilter(
 513         tsf_message_filter.PassAs<base::MessageLoopForUI::MessageFilter>());
 514     }
 515   }
 516 #endif
 517
 518   if (parts_)
 519     parts_->PostMainMessageLoopStart();
 520
 521 #if defined(OS_ANDROID)
 522   {
 523     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:SurfaceTexturePeer")
 524     SurfaceTexturePeer::InitInstance(new SurfaceTexturePeerBrowserImpl());
 525   }
 526 #endif
 527
 528   if (parsed_command_line_.HasSwitch(switches::kMemoryMetrics)) {
 529     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:MemoryObserver")
 530     memory_observer_.reset(new MemoryObserver());
 531     base::MessageLoop::current()->AddTaskObserver(memory_observer_.get());
 532   }
 533
 534 #if defined(TCMALLOC_TRACE_MEMORY_SUPPORTED)
 535   trace_memory_controller_.reset(new base::debug::TraceMemoryController(
 536       base::MessageLoop::current()->message_loop_proxy(),
 537       ::HeapProfilerWithPseudoStackStart,
 538       ::HeapProfilerStop,
 539       ::GetHeapProfile));
 540 #endif
 541 }
 542
 543 int BrowserMainLoop::PreCreateThreads() {
 544
 545   if (parts_) {
 546     TRACE_EVENT0("startup",
 547         "BrowserMainLoop::CreateThreads:PreCreateThreads");
 548     result_code_ = parts_->PreCreateThreads();
 549   }
 550
 551 #if defined(ENABLE_PLUGINS)
 552   // Prior to any processing happening on the io thread, we create the
 553   // plugin service as it is predominantly used from the io thread,
 554   // but must be created on the main thread. The service ctor is
 555   // inexpensive and does not invoke the io_thread() accessor.
 556   {
 557     TRACE_EVENT0("startup", "BrowserMainLoop::CreateThreads:PluginService")
 558     PluginService::GetInstance()->Init();
 559   }
 560 #endif
 561
 562 #if !defined(OS_IOS) && (!defined(GOOGLE_CHROME_BUILD) || defined(OS_ANDROID))
 563   // Single-process is an unsupported and not fully tested mode, so
 564   // don't enable it for official Chrome builds (except on Android).
 565   if (parsed_command_line_.HasSwitch(switches::kSingleProcess))
 566     RenderProcessHost::SetRunRendererInProcess(true);
 567 #endif
 568   return result_code_;
 569 }
 570
 571 void BrowserMainLoop::CreateStartupTasks() {
 572   TRACE_EVENT0("startup", "BrowserMainLoop::CreateStartupTasks");
 573
 574   // First time through, we really want to create all the tasks
 575   if (!startup_task_runner_.get()) {
 576 #if defined(OS_ANDROID)
 577     startup_task_runner_ = make_scoped_ptr(new StartupTaskRunner(
 578         base::Bind(&BrowserStartupComplete),
 579         base::MessageLoop::current()->message_loop_proxy()));
 580 #else
 581     startup_task_runner_ = make_scoped_ptr(new StartupTaskRunner(
 582         base::Callback<void(int)>(),
 583         base::MessageLoop::current()->message_loop_proxy()));
 584 #endif
 585     StartupTask pre_create_threads =
 586         base::Bind(&BrowserMainLoop::PreCreateThreads, base::Unretained(this));
 587     startup_task_runner_->AddTask(pre_create_threads);
 588
 589     StartupTask create_threads =
 590         base::Bind(&BrowserMainLoop::CreateThreads, base::Unretained(this));
 591     startup_task_runner_->AddTask(create_threads);
 592
 593     StartupTask browser_thread_started = base::Bind(
 594         &BrowserMainLoop::BrowserThreadsStarted, base::Unretained(this));
 595     startup_task_runner_->AddTask(browser_thread_started);
 596
 597     StartupTask pre_main_message_loop_run = base::Bind(
 598         &BrowserMainLoop::PreMainMessageLoopRun, base::Unretained(this));
 599     startup_task_runner_->AddTask(pre_main_message_loop_run);
 600
 601 #if defined(OS_ANDROID)
 602     if (BrowserMayStartAsynchronously()) {
 603       startup_task_runner_->StartRunningTasksAsync();
 604     }
 605 #endif
 606   }
 607 #if defined(OS_ANDROID)
 608   if (!BrowserMayStartAsynchronously()) {
 609     // A second request for asynchronous startup can be ignored, so
 610     // StartupRunningTasksAsync is only called first time through. If, however,
 611     // this is a request for synchronous startup then it must override any
 612     // previous call for async startup, so we call RunAllTasksNow()
 613     // unconditionally.
 614     startup_task_runner_->RunAllTasksNow();
 615   }
 616 #else
 617   startup_task_runner_->RunAllTasksNow();
 618 #endif
 619 }
 620
 621 int BrowserMainLoop::CreateThreads() {
 622   TRACE_EVENT0("startup", "BrowserMainLoop::CreateThreads");
 623
 624   base::Thread::Options default_options;
 625   base::Thread::Options io_message_loop_options;
 626   io_message_loop_options.message_loop_type = base::MessageLoop::TYPE_IO;
 627   base::Thread::Options ui_message_loop_options;
 628   ui_message_loop_options.message_loop_type = base::MessageLoop::TYPE_UI;
 629
 630   // Start threads in the order they occur in the BrowserThread::ID
 631   // enumeration, except for BrowserThread::UI which is the main
 632   // thread.
 633   //
 634   // Must be size_t so we can increment it.
 635   for (size_t thread_id = BrowserThread::UI + 1;
 636        thread_id < BrowserThread::ID_COUNT;
 637        ++thread_id) {
 638     scoped_ptr<BrowserProcessSubThread>* thread_to_start = NULL;
 639     base::Thread::Options* options = &default_options;
 640
 641     switch (thread_id) {
 642       case BrowserThread::DB:
 643         TRACE_EVENT_BEGIN1("startup",
 644             "BrowserMainLoop::CreateThreads:start",
 645             "Thread", "BrowserThread::DB");
 646         thread_to_start = &db_thread_;
 647         break;
 648       case BrowserThread::FILE_USER_BLOCKING:
 649         TRACE_EVENT_BEGIN1("startup",
 650             "BrowserMainLoop::CreateThreads:start",
 651             "Thread", "BrowserThread::FILE_USER_BLOCKING");
 652         thread_to_start = &file_user_blocking_thread_;
 653         break;
 654       case BrowserThread::FILE:
 655         TRACE_EVENT_BEGIN1("startup",
 656             "BrowserMainLoop::CreateThreads:start",
 657             "Thread", "BrowserThread::FILE");
 658         thread_to_start = &file_thread_;
 659 #if defined(OS_WIN)
 660         // On Windows, the FILE thread needs to be have a UI message loop
 661         // which pumps messages in such a way that Google Update can
 662         // communicate back to us.
 663         options = &ui_message_loop_options;
 664 #else
 665         options = &io_message_loop_options;
 666 #endif
 667         break;
 668       case BrowserThread::PROCESS_LAUNCHER:
 669         TRACE_EVENT_BEGIN1("startup",
 670             "BrowserMainLoop::CreateThreads:start",
 671             "Thread", "BrowserThread::PROCESS_LAUNCHER");
 672         thread_to_start = &process_launcher_thread_;
 673         break;
 674       case BrowserThread::CACHE:
 675         TRACE_EVENT_BEGIN1("startup",
 676             "BrowserMainLoop::CreateThreads:start",
 677             "Thread", "BrowserThread::CACHE");
 678         thread_to_start = &cache_thread_;
 679         options = &io_message_loop_options;
 680         break;
 681       case BrowserThread::IO:
 682         TRACE_EVENT_BEGIN1("startup",
 683             "BrowserMainLoop::CreateThreads:start",
 684             "Thread", "BrowserThread::IO");
 685         thread_to_start = &io_thread_;
 686         options = &io_message_loop_options;
 687         break;
 688       case BrowserThread::UI:
 689       case BrowserThread::ID_COUNT:
 690       default:
 691         NOTREACHED();
 692         break;
 693     }
 694
 695     BrowserThread::ID id = static_cast<BrowserThread::ID>(thread_id);
 696
 697     if (thread_to_start) {
 698       (*thread_to_start).reset(new BrowserProcessSubThread(id));
 699       (*thread_to_start)->StartWithOptions(*options);
 700     } else {
 701       NOTREACHED();
 702     }
 703
 704     TRACE_EVENT_END0("startup", "BrowserMainLoop::CreateThreads:start");
 705
 706   }
 707   created_threads_ = true;
 708   return result_code_;
 709 }
 710
 711 int BrowserMainLoop::PreMainMessageLoopRun() {
 712   if (parts_) {
 713     TRACE_EVENT0("startup",
 714         "BrowserMainLoop::CreateThreads:PreMainMessageLoopRun");
 715     parts_->PreMainMessageLoopRun();
 716   }
 717
 718   // If the UI thread blocks, the whole UI is unresponsive.
 719   // Do not allow disk IO from the UI thread.
 720   base::ThreadRestrictions::SetIOAllowed(false);
 721   base::ThreadRestrictions::DisallowWaiting();
 722   return result_code_;
 723 }
 724
 725 void BrowserMainLoop::RunMainMessageLoopParts() {
 726   TRACE_EVENT_BEGIN_ETW("BrowserMain:MESSAGE_LOOP", 0, "");
 727
 728   bool ran_main_loop = false;
 729   if (parts_)
 730     ran_main_loop = parts_->MainMessageLoopRun(&result_code_);
 731
 732   if (!ran_main_loop)
 733     MainMessageLoopRun();
 734
 735   TRACE_EVENT_END_ETW("BrowserMain:MESSAGE_LOOP", 0, "");
 736 }
 737
 738 void BrowserMainLoop::ShutdownThreadsAndCleanUp() {
 739   if (!created_threads_) {
 740     // Called early, nothing to do
 741     return;
 742   }
 743   TRACE_EVENT0("shutdown", "BrowserMainLoop::ShutdownThreadsAndCleanUp")
 744
 745   // Teardown may start in PostMainMessageLoopRun, and during teardown we
 746   // need to be able to perform IO.
 747   base::ThreadRestrictions::SetIOAllowed(true);
 748   BrowserThread::PostTask(
 749       BrowserThread::IO, FROM_HERE,
 750       base::Bind(base::IgnoreResult(&base::ThreadRestrictions::SetIOAllowed),
 751                  true));
 752
 753   if (RenderProcessHost::run_renderer_in_process())
 754     RenderProcessHostImpl::ShutDownInProcessRenderer();
 755
 756   if (parts_) {
 757     TRACE_EVENT0("shutdown",
 758                  "BrowserMainLoop::Subsystem:PostMainMessageLoopRun");
 759     parts_->PostMainMessageLoopRun();
 760   }
 761
 762   trace_memory_controller_.reset();
 763   system_stats_monitor_.reset();
 764
 765 #if !defined(OS_IOS)
 766   // Destroying the GpuProcessHostUIShims on the UI thread posts a task to
 767   // delete related objects on the GPU thread. This must be done before
 768   // stopping the GPU thread. The GPU thread will close IPC channels to renderer
 769   // processes so this has to happen before stopping the IO thread.
 770   {
 771     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:GPUProcessHostShim");
 772     GpuProcessHostUIShim::DestroyAll();
 773   }
 774   // Cancel pending requests and prevent new requests.
 775   if (resource_dispatcher_host_) {
 776     TRACE_EVENT0("shutdown",
 777                  "BrowserMainLoop::Subsystem:ResourceDispatcherHost");
 778     resource_dispatcher_host_.get()->Shutdown();
 779   }
 780
 781 #if defined(USE_AURA)
 782   {
 783     TRACE_EVENT0("shutdown",
 784                  "BrowserMainLoop::Subsystem:ImageTransportFactory");
 785     ImageTransportFactory::Terminate();
 786   }
 787 #endif
 788
 789   // The device monitors are using |system_monitor_| as dependency, so delete
 790   // them before |system_monitor_| goes away.
 791   // On Mac and windows, the monitor needs to be destroyed on the same thread
 792   // as they were created. On Linux, the monitor will be deleted when IO thread
 793   // goes away.
 794 #if defined(OS_WIN)
 795   system_message_window_.reset();
 796 #elif defined(OS_MACOSX)
 797   device_monitor_mac_.reset();
 798 #endif
 799 #endif  // !defined(OS_IOS)
 800
 801   // Must be size_t so we can subtract from it.
 802   for (size_t thread_id = BrowserThread::ID_COUNT - 1;
 803        thread_id >= (BrowserThread::UI + 1);
 804        --thread_id) {
 805     // Find the thread object we want to stop. Looping over all valid
 806     // BrowserThread IDs and DCHECKing on a missing case in the switch
 807     // statement helps avoid a mismatch between this code and the
 808     // BrowserThread::ID enumeration.
 809     //
 810     // The destruction order is the reverse order of occurrence in the
 811     // BrowserThread::ID list. The rationale for the order is as
 812     // follows (need to be filled in a bit):
 813     //
 814     //
 815     // - The IO thread is the only user of the CACHE thread.
 816     //
 817     // - The PROCESS_LAUNCHER thread must be stopped after IO in case
 818     //   the IO thread posted a task to terminate a process on the
 819     //   process launcher thread.
 820     //
 821     // - (Not sure why DB stops last.)
 822     switch (thread_id) {
 823       case BrowserThread::DB: {
 824           TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:DBThread");
 825           db_thread_.reset();
 826         }
 827         break;
 828       case BrowserThread::FILE_USER_BLOCKING: {
 829           TRACE_EVENT0("shutdown",
 830                        "BrowserMainLoop::Subsystem:FileUserBlockingThread");
 831           file_user_blocking_thread_.reset();
 832         }
 833         break;
 834       case BrowserThread::FILE: {
 835           TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:FileThread");
 836 #if !defined(OS_IOS)
 837           // Clean up state that lives on or uses the file_thread_ before
 838           // it goes away.
 839           if (resource_dispatcher_host_)
 840             resource_dispatcher_host_.get()->save_file_manager()->Shutdown();
 841 #endif  // !defined(OS_IOS)
 842           file_thread_.reset();
 843         }
 844         break;
 845       case BrowserThread::PROCESS_LAUNCHER: {
 846           TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:LauncherThread");
 847           process_launcher_thread_.reset();
 848         }
 849         break;
 850       case BrowserThread::CACHE: {
 851           TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:CacheThread");
 852           cache_thread_.reset();
 853         }
 854         break;
 855       case BrowserThread::IO: {
 856           TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:IOThread");
 857           io_thread_.reset();
 858         }
 859         break;
 860       case BrowserThread::UI:
 861       case BrowserThread::ID_COUNT:
 862       default:
 863         NOTREACHED();
 864         break;
 865     }
 866   }
 867
 868 #if !defined(OS_IOS)
 869   {
 870     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:IndexedDBThread");
 871     indexed_db_thread_.reset();
 872   }
 873 #endif
 874
 875   // Close the blocking I/O pool after the other threads. Other threads such
 876   // as the I/O thread may need to schedule work like closing files or flushing
 877   // data during shutdown, so the blocking pool needs to be available. There
 878   // may also be slow operations pending that will blcok shutdown, so closing
 879   // it here (which will block until required operations are complete) gives
 880   // more head start for those operations to finish.
 881   {
 882     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:ThreadPool");
 883     BrowserThreadImpl::ShutdownThreadPool();
 884   }
 885
 886 #if !defined(OS_IOS)
 887   // Must happen after the IO thread is shutdown since this may be accessed from
 888   // it.
 889   {
 890     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:GPUChannelFactory");
 891     if (BrowserGpuChannelHostFactory::instance())
 892       BrowserGpuChannelHostFactory::Terminate();
 893   }
 894
 895   // Must happen after the I/O thread is shutdown since this class lives on the
 896   // I/O thread and isn't threadsafe.
 897   {
 898     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:GamepadService");
 899     GamepadService::GetInstance()->Terminate();
 900   }
 901   {
 902     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:SensorService");
 903     DeviceInertialSensorService::GetInstance()->Shutdown();
 904   }
 905   {
 906     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:DeleteDataSources");
 907     URLDataManager::DeleteDataSources();
 908   }
 909 #endif  // !defined(OS_IOS)
 910
 911   if (parts_) {
 912     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:PostDestroyThreads");
 913     parts_->PostDestroyThreads();
 914   }
 915 }
 916
 917 void BrowserMainLoop::InitializeMainThread() {
 918   TRACE_EVENT0("startup", "BrowserMainLoop::InitializeMainThread")
 919   const char* kThreadName = "CrBrowserMain";
 920   base::PlatformThread::SetName(kThreadName);
 921   if (main_message_loop_)
 922     main_message_loop_->set_thread_name(kThreadName);
 923
 924   // Register the main thread by instantiating it, but don't call any methods.
 925   main_thread_.reset(
 926       new BrowserThreadImpl(BrowserThread::UI, base::MessageLoop::current()));
 927 }
 928
 929 int BrowserMainLoop::BrowserThreadsStarted() {
 930   TRACE_EVENT0("startup", "BrowserMainLoop::BrowserThreadsStarted")
 931
 932 #if !defined(OS_IOS)
 933   indexed_db_thread_.reset(new base::Thread("IndexedDB"));
 934   indexed_db_thread_->Start();
 935 #endif
 936
 937 #if defined(OS_ANDROID)
 938   // Up the priority of anything that touches with display tasks
 939   // (this thread is UI thread, and io_thread_ is for IPCs).
 940   io_thread_->SetPriority(base::kThreadPriority_Display);
 941   base::PlatformThread::SetThreadPriority(
 942       base::PlatformThread::CurrentHandle(),
 943       base::kThreadPriority_Display);
 944 #endif
 945
 946 #if !defined(OS_IOS)
 947   HistogramSynchronizer::GetInstance();
 948
 949   // Initialize the GpuDataManager before we set up the MessageLoops because
 950   // otherwise we'll trigger the assertion about doing IO on the UI thread.
 951   GpuDataManagerImpl::GetInstance()->Initialize();
 952
 953   bool always_uses_gpu = IsForceCompositingModeEnabled();
 954   bool established_gpu_channel = false;
 955 #if defined(USE_AURA) || defined(OS_ANDROID)
 956   established_gpu_channel =
 957       !parsed_command_line_.HasSwitch(switches::kDisableGpuProcessPrelaunch) ||
 958       parsed_command_line_.HasSwitch(switches::kSingleProcess) ||
 959       parsed_command_line_.HasSwitch(switches::kInProcessGPU);
 960 #if defined(USE_AURA)
 961   if (!GpuDataManagerImpl::GetInstance()->CanUseGpuBrowserCompositor()) {
 962     established_gpu_channel = always_uses_gpu = false;
 963   }
 964   BrowserGpuChannelHostFactory::Initialize(established_gpu_channel);
 965   ImageTransportFactory::Initialize();
 966 #elif defined(OS_ANDROID)
 967   BrowserGpuChannelHostFactory::Initialize(established_gpu_channel);
 968 #endif
 969 #endif
 970
 971 #if defined(OS_LINUX) && defined(USE_UDEV)
 972   device_monitor_linux_.reset(new DeviceMonitorLinux());
 973 #elif defined(OS_MACOSX)
 974   device_monitor_mac_.reset(new DeviceMonitorMac());
 975 #endif
 976
 977   // RDH needs the IO thread to be created
 978   {
 979     TRACE_EVENT0("startup",
 980       "BrowserMainLoop::BrowserThreadsStarted:InitResourceDispatcherHost");
 981     resource_dispatcher_host_.reset(new ResourceDispatcherHostImpl());
 982   }
 983
 984   // MediaStreamManager needs the IO thread to be created.
 985   {
 986     TRACE_EVENT0("startup",
 987       "BrowserMainLoop::BrowserThreadsStarted:InitMediaStreamManager");
 988     media_stream_manager_.reset(new MediaStreamManager(audio_manager_.get()));
 989   }
 990
 991   {
 992     TRACE_EVENT0("startup",
 993       "BrowserMainLoop::BrowserThreadsStarted:InitSpeechRecognition");
 994     speech_recognition_manager_.reset(new SpeechRecognitionManagerImpl(
 995         audio_manager_.get(), media_stream_manager_.get()));
 996   }
 997
 998   {
 999     TRACE_EVENT0(
1000         "startup",
1001         "BrowserMainLoop::BrowserThreadsStarted::InitUserInputMonitor");
1002     user_input_monitor_ = media::UserInputMonitor::Create(
1003         io_thread_->message_loop_proxy(), main_thread_->message_loop_proxy());
1004   }
1005
1006   // Alert the clipboard class to which threads are allowed to access the
1007   // clipboard:
1008   std::vector<base::PlatformThreadId> allowed_clipboard_threads;
1009   // The current thread is the UI thread.
1010   allowed_clipboard_threads.push_back(base::PlatformThread::CurrentId());
1011 #if defined(OS_WIN)
1012   // On Windows, clipboards are also used on the File or IO threads.
1013   allowed_clipboard_threads.push_back(file_thread_->thread_id());
1014   allowed_clipboard_threads.push_back(io_thread_->thread_id());
1015 #endif
1016   ui::Clipboard::SetAllowedThreads(allowed_clipboard_threads);
1017
1018   // When running the GPU thread in-process, avoid optimistically starting it
1019   // since creating the GPU thread races against creation of the one-and-only
1020   // ChildProcess instance which is created by the renderer thread.
1021   if (GpuDataManagerImpl::GetInstance()->GpuAccessAllowed(NULL) &&
1022       !established_gpu_channel &&
1023       always_uses_gpu &&
1024       !parsed_command_line_.HasSwitch(switches::kDisableGpuProcessPrelaunch) &&
1025       !parsed_command_line_.HasSwitch(switches::kSingleProcess) &&
1026       !parsed_command_line_.HasSwitch(switches::kInProcessGPU)) {
1027     TRACE_EVENT_INSTANT0("gpu", "Post task to launch GPU process",
1028                          TRACE_EVENT_SCOPE_THREAD);
1029     BrowserThread::PostTask(
1030         BrowserThread::IO, FROM_HERE, base::Bind(
1031             base::IgnoreResult(&GpuProcessHost::Get),
1032             GpuProcessHost::GPU_PROCESS_KIND_SANDBOXED,
1033             CAUSE_FOR_GPU_LAUNCH_BROWSER_STARTUP));
1034   }
1035 #endif  // !defined(OS_IOS)
1036
1037 #if defined(OS_MACOSX)
1038   ThemeHelperMac::GetInstance();
1039 #endif
1040   return result_code_;
1041 }
1042
1043 void BrowserMainLoop::InitializeToolkit() {
1044   TRACE_EVENT0("startup", "BrowserMainLoop::InitializeToolkit")
1045   // TODO(evan): this function is rather subtle, due to the variety
1046   // of intersecting ifdefs we have.  To keep it easy to follow, there
1047   // are no #else branches on any #ifs.
1048   // TODO(stevenjb): Move platform specific code into platform specific Parts
1049   // (Need to add InitializeToolkit stage to BrowserParts).
1050   // See also GTK setup in EarlyInitialization, above, and associated comments.
1051
1052 #if defined(TOOLKIT_GTK)
1053   // It is important for this to happen before the first run dialog, as it
1054   // styles the dialog as well.
1055   gfx::InitRCStyles();
1056 #endif
1057
1058 #if defined(OS_WIN)
1059   // Init common control sex.
1060   INITCOMMONCONTROLSEX config;
1061   config.dwSize = sizeof(config);
1062   config.dwICC = ICC_WIN95_CLASSES;
1063   if (!InitCommonControlsEx(&config))
1064     LOG_GETLASTERROR(FATAL);
1065 #endif
1066
1067   if (parts_)
1068     parts_->ToolkitInitialized();
1069 }
1070
1071 void BrowserMainLoop::MainMessageLoopRun() {
1072 #if defined(OS_ANDROID)
1073   // Android's main message loop is the Java message loop.
1074   NOTREACHED();
1075 #else
1076   DCHECK_EQ(base::MessageLoop::TYPE_UI, base::MessageLoop::current()->type());
1077   if (parameters_.ui_task)
1078     base::MessageLoopForUI::current()->PostTask(FROM_HERE,
1079                                                 *parameters_.ui_task);
1080
1081   base::RunLoop run_loop;
1082   run_loop.Run();
1083 #endif
1084 }
1085
1086 void BrowserMainLoop::InitStartupTracing(const CommandLine& command_line) {
1087   DCHECK(is_tracing_startup_);
1088
1089   base::FilePath trace_file = command_line.GetSwitchValuePath(
1090       switches::kTraceStartupFile);
1091   // trace_file = "none" means that startup events will show up for the next
1092   // begin/end tracing (via about:tracing or AutomationProxy::BeginTracing/
1093   // EndTracing, for example).
1094   if (trace_file == base::FilePath().AppendASCII("none"))
1095     return;
1096
1097   if (trace_file.empty()) {
1098     // Default to saving the startup trace into the current dir.
1099     trace_file = base::FilePath().AppendASCII("chrometrace.log");
1100   }
1101
1102   std::string delay_str = command_line.GetSwitchValueASCII(
1103       switches::kTraceStartupDuration);
1104   int delay_secs = 5;
1105   if (!delay_str.empty() && !base::StringToInt(delay_str, &delay_secs)) {
1106     DLOG(WARNING) << "Could not parse --" << switches::kTraceStartupDuration
1107         << "=" << delay_str << " defaulting to 5 (secs)";
1108     delay_secs = 5;
1109   }
1110
1111   BrowserThread::PostDelayedTask(
1112       BrowserThread::UI, FROM_HERE,
1113       base::Bind(&BrowserMainLoop::EndStartupTracing,
1114                  base::Unretained(this), trace_file),
1115       base::TimeDelta::FromSeconds(delay_secs));
1116 }
1117
1118 void BrowserMainLoop::EndStartupTracing(const base::FilePath& trace_file) {
1119   is_tracing_startup_ = false;
1120   TracingController::GetInstance()->DisableRecording(
1121       trace_file, TracingController::TracingFileResultCallback());
1122 }
1123
1124 }  // namespace content