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/battery_status/battery_status_service.h"
  27 #include "content/browser/browser_thread_impl.h"
  28 #include "content/browser/device_sensors/device_inertial_sensor_service.h"
  29 #include "content/browser/download/save_file_manager.h"
  30 #include "content/browser/gamepad/gamepad_service.h"
  31 #include "content/browser/gpu/browser_gpu_channel_host_factory.h"
  32 #include "content/browser/gpu/compositor_util.h"
  33 #include "content/browser/gpu/gpu_data_manager_impl.h"
  34 #include "content/browser/gpu/gpu_process_host.h"
  35 #include "content/browser/gpu/gpu_process_host_ui_shim.h"
  36 #include "content/browser/histogram_synchronizer.h"
  37 #include "content/browser/loader/resource_dispatcher_host_impl.h"
  38 #include "content/browser/media/capture/audio_mirroring_manager.h"
  39 #include "content/browser/media/media_internals.h"
  40 #include "content/browser/net/browser_online_state_observer.h"
  41 #include "content/browser/plugin_service_impl.h"
  42 #include "content/browser/renderer_host/media/media_stream_manager.h"
  43 #include "content/browser/speech/speech_recognition_manager_impl.h"
  44 #include "content/browser/startup_task_runner.h"
  45 #include "content/browser/time_zone_monitor.h"
  46 #include "content/browser/webui/content_web_ui_controller_factory.h"
  47 #include "content/browser/webui/url_data_manager.h"
  48 #include "content/public/browser/browser_main_parts.h"
  49 #include "content/public/browser/browser_shutdown.h"
  50 #include "content/public/browser/content_browser_client.h"
  51 #include "content/public/browser/render_process_host.h"
  52 #include "content/public/browser/tracing_controller.h"
  53 #include "content/public/common/content_switches.h"
  54 #include "content/public/common/main_function_params.h"
  55 #include "content/public/common/result_codes.h"
  56 #include "crypto/nss_util.h"
  57 #include "media/audio/audio_manager.h"
  58 #include "media/base/media.h"
  59 #include "media/base/user_input_monitor.h"
  60 #include "media/midi/midi_manager.h"
  61 #include "net/base/network_change_notifier.h"
  62 #include "net/socket/client_socket_factory.h"
  63 #include "net/ssl/ssl_config_service.h"
  64 #include "ui/base/clipboard/clipboard.h"
  65
  66 #if defined(USE_AURA) || (defined(OS_MACOSX) && !defined(OS_IOS))
  67 #include "content/browser/compositor/image_transport_factory.h"
  68 #endif
  69
  70 #if defined(USE_AURA)
  71 #include "content/public/browser/context_factory.h"
  72 #include "ui/aura/env.h"
  73 #endif
  74
  75 #if !defined(OS_IOS)
  76 #include "content/browser/renderer_host/render_process_host_impl.h"
  77 #endif
  78
  79 #if defined(OS_ANDROID)
  80 #include "base/android/jni_android.h"
  81 #include "content/browser/android/browser_startup_controller.h"
  82 #include "content/browser/android/surface_texture_peer_browser_impl.h"
  83 #include "content/browser/android/tracing_controller_android.h"
  84 #include "ui/gl/gl_surface.h"
  85 #endif
  86
  87 #if defined(OS_MACOSX) && !defined(OS_IOS)
  88 #include "content/browser/bootstrap_sandbox_mac.h"
  89 #include "content/browser/theme_helper_mac.h"
  90 #endif
  91
  92 #if defined(OS_WIN)
  93 #include <windows.h>
  94 #include <commctrl.h>
  95 #include <shellapi.h>
  96
  97 #include "content/browser/system_message_window_win.h"
  98 #include "content/common/sandbox_win.h"
  99 #include "net/base/winsock_init.h"
 100 #include "ui/base/l10n/l10n_util_win.h"
 101 #endif
 102
 103 #if defined(USE_GLIB)
 104 #include <glib-object.h>
 105 #endif
 106
 107 #if defined(OS_LINUX) && defined(USE_UDEV)
 108 #include "content/browser/device_monitor_udev.h"
 109 #elif defined(OS_MACOSX) && !defined(OS_IOS)
 110 #include "content/browser/device_monitor_mac.h"
 111 #endif
 112
 113 #if defined(OS_POSIX) && !defined(OS_MACOSX)
 114 #include "content/browser/renderer_host/render_sandbox_host_linux.h"
 115 #include "content/browser/zygote_host/zygote_host_impl_linux.h"
 116 #include "sandbox/linux/suid/client/setuid_sandbox_client.h"
 117 #endif
 118
 119 #if defined(TCMALLOC_TRACE_MEMORY_SUPPORTED)
 120 #include "third_party/tcmalloc/chromium/src/gperftools/heap-profiler.h"
 121 #endif
 122
 123 #if defined(USE_X11)
 124 #include "ui/gfx/x/x11_connection.h"
 125 #include "ui/gfx/x/x11_types.h"
 126 #endif
 127
 128 // One of the linux specific headers defines this as a macro.
 129 #ifdef DestroyAll
 130 #undef DestroyAll
 131 #endif
 132
 133 namespace content {
 134 namespace {
 135
 136 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 137 void SetupSandbox(const CommandLine& parsed_command_line) {
 138   TRACE_EVENT0("startup", "SetupSandbox");
 139   base::FilePath sandbox_binary;
 140
 141   scoped_ptr<sandbox::SetuidSandboxClient> setuid_sandbox_client(
 142       sandbox::SetuidSandboxClient::Create());
 143
 144   const bool want_setuid_sandbox =
 145       !parsed_command_line.HasSwitch(switches::kNoSandbox) &&
 146       !parsed_command_line.HasSwitch(switches::kDisableSetuidSandbox) &&
 147       !setuid_sandbox_client->IsDisabledViaEnvironment();
 148
 149   static const char no_suid_error[] =
 150       "Running without the SUID sandbox! See "
 151       "https://code.google.com/p/chromium/wiki/LinuxSUIDSandboxDevelopment "
 152       "for more information on developing with the sandbox on.";
 153   if (want_setuid_sandbox) {
 154     sandbox_binary = setuid_sandbox_client->GetSandboxBinaryPath();
 155     if (sandbox_binary.empty()) {
 156       // This needs to be fatal. Talk to security@chromium.org if you feel
 157       // otherwise.
 158       LOG(FATAL) << no_suid_error;
 159     }
 160   } else {
 161     LOG(ERROR) << no_suid_error;
 162   }
 163
 164   // Tickle the sandbox host and zygote host so they fork now.
 165   RenderSandboxHostLinux::GetInstance()->Init();
 166   ZygoteHostImpl::GetInstance()->Init(sandbox_binary.value());
 167 }
 168 #endif
 169
 170 #if defined(USE_GLIB)
 171 static void GLibLogHandler(const gchar* log_domain,
 172                            GLogLevelFlags log_level,
 173                            const gchar* message,
 174                            gpointer userdata) {
 175   if (!log_domain)
 176     log_domain = "<unknown>";
 177   if (!message)
 178     message = "<no message>";
 179
 180   if (strstr(message, "Unable to retrieve the file info for")) {
 181     LOG(ERROR) << "GTK File code error: " << message;
 182   } else if (strstr(message, "Could not find the icon") &&
 183              strstr(log_domain, "Gtk")) {
 184     LOG(ERROR) << "GTK icon error: " << message;
 185   } else if (strstr(message, "Theme file for default has no") ||
 186              strstr(message, "Theme directory") ||
 187              strstr(message, "theme pixmap") ||
 188              strstr(message, "locate theme engine")) {
 189     LOG(ERROR) << "GTK theme error: " << message;
 190   } else if (strstr(message, "Unable to create Ubuntu Menu Proxy") &&
 191              strstr(log_domain, "<unknown>")) {
 192     LOG(ERROR) << "GTK menu proxy create failed";
 193   } else if (strstr(message, "Out of memory") &&
 194              strstr(log_domain, "<unknown>")) {
 195     LOG(ERROR) << "DBus call timeout or out of memory: "
 196                << "http://crosbug.com/15496";
 197   } else if (strstr(message, "Could not connect: Connection refused") &&
 198              strstr(log_domain, "<unknown>")) {
 199     LOG(ERROR) << "DConf settings backend could not connect to session bus: "
 200                << "http://crbug.com/179797";
 201   } else if (strstr(message, "Attempting to store changes into") ||
 202              strstr(message, "Attempting to set the permissions of")) {
 203     LOG(ERROR) << message << " (http://bugs.chromium.org/161366)";
 204   } else if (strstr(message, "drawable is not a native X11 window")) {
 205     LOG(ERROR) << message << " (http://bugs.chromium.org/329991)";
 206   } else {
 207     LOG(DFATAL) << log_domain << ": " << message;
 208   }
 209 }
 210
 211 static void SetUpGLibLogHandler() {
 212   // Register GLib-handled assertions to go through our logging system.
 213   const char* kLogDomains[] = { NULL, "Gtk", "Gdk", "GLib", "GLib-GObject" };
 214   for (size_t i = 0; i < arraysize(kLogDomains); i++) {
 215     g_log_set_handler(kLogDomains[i],
 216                       static_cast<GLogLevelFlags>(G_LOG_FLAG_RECURSION |
 217                                                   G_LOG_FLAG_FATAL |
 218                                                   G_LOG_LEVEL_ERROR |
 219                                                   G_LOG_LEVEL_CRITICAL |
 220                                                   G_LOG_LEVEL_WARNING),
 221                       GLibLogHandler,
 222                       NULL);
 223   }
 224 }
 225 #endif
 226
 227 void OnStoppedStartupTracing(const base::FilePath& trace_file) {
 228   VLOG(0) << "Completed startup tracing to " << trace_file.value();
 229 }
 230
 231 #if defined(USE_AURA)
 232 bool ShouldInitializeBrowserGpuChannelAndTransportSurface() {
 233   return true;
 234 }
 235 #elif defined(OS_MACOSX) && !defined(OS_IOS)
 236 bool ShouldInitializeBrowserGpuChannelAndTransportSurface() {
 237   return IsDelegatedRendererEnabled();
 238 }
 239 #endif
 240
 241 }  // namespace
 242
 243 // The currently-running BrowserMainLoop.  There can be one or zero.
 244 BrowserMainLoop* g_current_browser_main_loop = NULL;
 245
 246 // This is just to be able to keep ShutdownThreadsAndCleanUp out of
 247 // the public interface of BrowserMainLoop.
 248 class BrowserShutdownImpl {
 249  public:
 250   static void ImmediateShutdownAndExitProcess() {
 251     DCHECK(g_current_browser_main_loop);
 252     g_current_browser_main_loop->ShutdownThreadsAndCleanUp();
 253
 254 #if defined(OS_WIN)
 255     // At this point the message loop is still running yet we've shut everything
 256     // down. If any messages are processed we'll likely crash. Exit now.
 257     ExitProcess(RESULT_CODE_NORMAL_EXIT);
 258 #elif defined(OS_POSIX) && !defined(OS_MACOSX)
 259     _exit(RESULT_CODE_NORMAL_EXIT);
 260 #else
 261     NOTIMPLEMENTED();
 262 #endif
 263   }
 264 };
 265
 266 void ImmediateShutdownAndExitProcess() {
 267   BrowserShutdownImpl::ImmediateShutdownAndExitProcess();
 268 }
 269
 270 // For measuring memory usage after each task. Behind a command line flag.
 271 class BrowserMainLoop::MemoryObserver : public base::MessageLoop::TaskObserver {
 272  public:
 273   MemoryObserver() {}
 274   virtual ~MemoryObserver() {}
 275
 276   virtual void WillProcessTask(const base::PendingTask& pending_task) OVERRIDE {
 277   }
 278
 279   virtual void DidProcessTask(const base::PendingTask& pending_task) OVERRIDE {
 280 #if !defined(OS_IOS)  // No ProcessMetrics on IOS.
 281     scoped_ptr<base::ProcessMetrics> process_metrics(
 282         base::ProcessMetrics::CreateProcessMetrics(
 283 #if defined(OS_MACOSX)
 284             base::GetCurrentProcessHandle(), NULL));
 285 #else
 286             base::GetCurrentProcessHandle()));
 287 #endif
 288     size_t private_bytes;
 289     process_metrics->GetMemoryBytes(&private_bytes, NULL);
 290     HISTOGRAM_MEMORY_KB("Memory.BrowserUsed", private_bytes >> 10);
 291 #endif
 292   }
 293  private:
 294   DISALLOW_COPY_AND_ASSIGN(MemoryObserver);
 295 };
 296
 297
 298 // BrowserMainLoop construction / destruction =============================
 299
 300 BrowserMainLoop* BrowserMainLoop::GetInstance() {
 301   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 302   return g_current_browser_main_loop;
 303 }
 304
 305 BrowserMainLoop::BrowserMainLoop(const MainFunctionParams& parameters)
 306     : parameters_(parameters),
 307       parsed_command_line_(parameters.command_line),
 308       result_code_(RESULT_CODE_NORMAL_EXIT),
 309       created_threads_(false),
 310       // ContentMainRunner should have enabled tracing of the browser process
 311       // when kTraceStartup is in the command line.
 312       is_tracing_startup_(
 313           parameters.command_line.HasSwitch(switches::kTraceStartup)) {
 314   DCHECK(!g_current_browser_main_loop);
 315   g_current_browser_main_loop = this;
 316 }
 317
 318 BrowserMainLoop::~BrowserMainLoop() {
 319   DCHECK_EQ(this, g_current_browser_main_loop);
 320 #if !defined(OS_IOS)
 321   ui::Clipboard::DestroyClipboardForCurrentThread();
 322 #endif  // !defined(OS_IOS)
 323   g_current_browser_main_loop = NULL;
 324 }
 325
 326 void BrowserMainLoop::Init() {
 327   TRACE_EVENT0("startup", "BrowserMainLoop::Init");
 328   parts_.reset(
 329       GetContentClient()->browser()->CreateBrowserMainParts(parameters_));
 330 }
 331
 332 // BrowserMainLoop stages ==================================================
 333
 334 void BrowserMainLoop::EarlyInitialization() {
 335   TRACE_EVENT0("startup", "BrowserMainLoop::EarlyInitialization");
 336
 337 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 338   // No thread should be created before this call, as SetupSandbox()
 339   // will end-up using fork().
 340   SetupSandbox(parsed_command_line_);
 341 #endif
 342
 343 #if defined(USE_X11)
 344   if (parsed_command_line_.HasSwitch(switches::kSingleProcess) ||
 345       parsed_command_line_.HasSwitch(switches::kInProcessGPU)) {
 346     if (!gfx::InitializeThreadedX11()) {
 347       LOG(ERROR) << "Failed to put Xlib into threaded mode.";
 348     }
 349   }
 350 #endif
 351
 352   // GLib's spawning of new processes is buggy, so it's important that at this
 353   // point GLib does not need to start DBUS. Chrome should always start with
 354   // DBUS_SESSION_BUS_ADDRESS properly set. See crbug.com/309093.
 355 #if defined(USE_GLIB)
 356   // g_type_init will be deprecated in 2.36. 2.35 is the development
 357   // version for 2.36, hence do not call g_type_init starting 2.35.
 358   // http://developer.gnome.org/gobject/unstable/gobject-Type-Information.html#g-type-init
 359 #if !GLIB_CHECK_VERSION(2, 35, 0)
 360   // GLib type system initialization. Needed at least for gconf,
 361   // used in net/proxy/proxy_config_service_linux.cc. Most likely
 362   // this is superfluous as gtk_init() ought to do this. It's
 363   // definitely harmless, so retained as a reminder of this
 364   // requirement for gconf.
 365   g_type_init();
 366 #endif
 367
 368   SetUpGLibLogHandler();
 369 #endif
 370
 371   if (parts_)
 372     parts_->PreEarlyInitialization();
 373
 374 #if defined(OS_MACOSX)
 375   // We use quite a few file descriptors for our IPC, and the default limit on
 376   // the Mac is low (256), so bump it up.
 377   base::SetFdLimit(1024);
 378 #endif
 379
 380 #if defined(OS_WIN)
 381   net::EnsureWinsockInit();
 382 #endif
 383
 384 #if !defined(USE_OPENSSL)
 385   // We want to be sure to init NSPR on the main thread.
 386   crypto::EnsureNSPRInit();
 387 #endif  // !defined(USE_OPENSSL)
 388
 389 #if !defined(OS_IOS)
 390   if (parsed_command_line_.HasSwitch(switches::kRendererProcessLimit)) {
 391     std::string limit_string = parsed_command_line_.GetSwitchValueASCII(
 392         switches::kRendererProcessLimit);
 393     size_t process_limit;
 394     if (base::StringToSizeT(limit_string, &process_limit)) {
 395       RenderProcessHost::SetMaxRendererProcessCount(process_limit);
 396     }
 397   }
 398 #endif  // !defined(OS_IOS)
 399
 400   if (parts_)
 401     parts_->PostEarlyInitialization();
 402 }
 403
 404 void BrowserMainLoop::MainMessageLoopStart() {
 405   TRACE_EVENT0("startup", "BrowserMainLoop::MainMessageLoopStart");
 406   if (parts_) {
 407     TRACE_EVENT0("startup",
 408         "BrowserMainLoop::MainMessageLoopStart:PreMainMessageLoopStart");
 409     parts_->PreMainMessageLoopStart();
 410   }
 411
 412 #if defined(OS_WIN)
 413   // If we're running tests (ui_task is non-null), then the ResourceBundle
 414   // has already been initialized.
 415   if (!parameters_.ui_task) {
 416     // Override the configured locale with the user's preferred UI language.
 417     l10n_util::OverrideLocaleWithUILanguageList();
 418   }
 419 #endif
 420
 421   // Create a MessageLoop if one does not already exist for the current thread.
 422   if (!base::MessageLoop::current())
 423     main_message_loop_.reset(new base::MessageLoopForUI);
 424
 425   InitializeMainThread();
 426
 427   {
 428     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:SystemMonitor");
 429     system_monitor_.reset(new base::SystemMonitor);
 430   }
 431   {
 432     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:PowerMonitor");
 433     scoped_ptr<base::PowerMonitorSource> power_monitor_source(
 434       new base::PowerMonitorDeviceSource());
 435     power_monitor_.reset(new base::PowerMonitor(power_monitor_source.Pass()));
 436   }
 437   {
 438     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:HighResTimerManager");
 439     hi_res_timer_manager_.reset(new base::HighResolutionTimerManager);
 440   }
 441   {
 442     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:NetworkChangeNotifier");
 443     network_change_notifier_.reset(net::NetworkChangeNotifier::Create());
 444   }
 445
 446 #if !defined(OS_IOS)
 447   {
 448     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:MediaFeatures");
 449     media::InitializeCPUSpecificMediaFeatures();
 450   }
 451   {
 452     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:AudioMan");
 453     audio_manager_.reset(media::AudioManager::Create(
 454         MediaInternals::GetInstance()));
 455   }
 456   {
 457     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:MidiManager");
 458     midi_manager_.reset(media::MidiManager::Create());
 459   }
 460   {
 461     TRACE_EVENT0("startup",
 462                  "BrowserMainLoop::Subsystem:ContentWebUIController");
 463     WebUIControllerFactory::RegisterFactory(
 464         ContentWebUIControllerFactory::GetInstance());
 465   }
 466
 467   {
 468     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:AudioMirroringManager");
 469     audio_mirroring_manager_.reset(new AudioMirroringManager());
 470   }
 471   {
 472     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:OnlineStateObserver");
 473     online_state_observer_.reset(new BrowserOnlineStateObserver);
 474   }
 475
 476   {
 477     system_stats_monitor_.reset(new base::debug::TraceEventSystemStatsMonitor(
 478         base::ThreadTaskRunnerHandle::Get()));
 479   }
 480 #endif  // !defined(OS_IOS)
 481
 482 #if defined(OS_WIN)
 483   system_message_window_.reset(new SystemMessageWindowWin);
 484 #endif
 485
 486   if (parts_)
 487     parts_->PostMainMessageLoopStart();
 488
 489 #if !defined(OS_IOS)
 490   // Start tracing to a file if needed. Only do this after starting the main
 491   // message loop to avoid calling MessagePumpForUI::ScheduleWork() before
 492   // MessagePumpForUI::Start() as it will crash the browser.
 493   if (is_tracing_startup_) {
 494     TRACE_EVENT0("startup", "BrowserMainLoop::InitStartupTracing");
 495     InitStartupTracing(parsed_command_line_);
 496   }
 497 #endif  // !defined(OS_IOS)
 498
 499 #if defined(OS_ANDROID)
 500   {
 501     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:SurfaceTexturePeer");
 502     SurfaceTexturePeer::InitInstance(new SurfaceTexturePeerBrowserImpl());
 503   }
 504 #endif
 505
 506   if (parsed_command_line_.HasSwitch(switches::kMemoryMetrics)) {
 507     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:MemoryObserver");
 508     memory_observer_.reset(new MemoryObserver());
 509     base::MessageLoop::current()->AddTaskObserver(memory_observer_.get());
 510   }
 511
 512 #if defined(TCMALLOC_TRACE_MEMORY_SUPPORTED)
 513   trace_memory_controller_.reset(new base::debug::TraceMemoryController(
 514       base::MessageLoop::current()->message_loop_proxy(),
 515       ::HeapProfilerWithPseudoStackStart,
 516       ::HeapProfilerStop,
 517       ::GetHeapProfile));
 518 #endif
 519 }
 520
 521 int BrowserMainLoop::PreCreateThreads() {
 522   if (parts_) {
 523     TRACE_EVENT0("startup",
 524         "BrowserMainLoop::CreateThreads:PreCreateThreads");
 525     result_code_ = parts_->PreCreateThreads();
 526   }
 527
 528 #if defined(ENABLE_PLUGINS)
 529   // Prior to any processing happening on the io thread, we create the
 530   // plugin service as it is predominantly used from the io thread,
 531   // but must be created on the main thread. The service ctor is
 532   // inexpensive and does not invoke the io_thread() accessor.
 533   {
 534     TRACE_EVENT0("startup", "BrowserMainLoop::CreateThreads:PluginService");
 535     PluginService::GetInstance()->Init();
 536   }
 537 #endif
 538
 539 #if !defined(OS_IOS) && (!defined(GOOGLE_CHROME_BUILD) || defined(OS_ANDROID))
 540   // Single-process is an unsupported and not fully tested mode, so
 541   // don't enable it for official Chrome builds (except on Android).
 542   if (parsed_command_line_.HasSwitch(switches::kSingleProcess))
 543     RenderProcessHost::SetRunRendererInProcess(true);
 544 #endif
 545   return result_code_;
 546 }
 547
 548 void BrowserMainLoop::CreateStartupTasks() {
 549   TRACE_EVENT0("startup", "BrowserMainLoop::CreateStartupTasks");
 550
 551   // First time through, we really want to create all the tasks
 552   if (!startup_task_runner_.get()) {
 553 #if defined(OS_ANDROID)
 554     startup_task_runner_ = make_scoped_ptr(new StartupTaskRunner(
 555         base::Bind(&BrowserStartupComplete),
 556         base::MessageLoop::current()->message_loop_proxy()));
 557 #else
 558     startup_task_runner_ = make_scoped_ptr(new StartupTaskRunner(
 559         base::Callback<void(int)>(),
 560         base::MessageLoop::current()->message_loop_proxy()));
 561 #endif
 562     StartupTask pre_create_threads =
 563         base::Bind(&BrowserMainLoop::PreCreateThreads, base::Unretained(this));
 564     startup_task_runner_->AddTask(pre_create_threads);
 565
 566     StartupTask create_threads =
 567         base::Bind(&BrowserMainLoop::CreateThreads, base::Unretained(this));
 568     startup_task_runner_->AddTask(create_threads);
 569
 570     StartupTask browser_thread_started = base::Bind(
 571         &BrowserMainLoop::BrowserThreadsStarted, base::Unretained(this));
 572     startup_task_runner_->AddTask(browser_thread_started);
 573
 574     StartupTask pre_main_message_loop_run = base::Bind(
 575         &BrowserMainLoop::PreMainMessageLoopRun, base::Unretained(this));
 576     startup_task_runner_->AddTask(pre_main_message_loop_run);
 577
 578 #if defined(OS_ANDROID)
 579     if (BrowserMayStartAsynchronously()) {
 580       startup_task_runner_->StartRunningTasksAsync();
 581     }
 582 #endif
 583   }
 584 #if defined(OS_ANDROID)
 585   if (!BrowserMayStartAsynchronously()) {
 586     // A second request for asynchronous startup can be ignored, so
 587     // StartupRunningTasksAsync is only called first time through. If, however,
 588     // this is a request for synchronous startup then it must override any
 589     // previous call for async startup, so we call RunAllTasksNow()
 590     // unconditionally.
 591     startup_task_runner_->RunAllTasksNow();
 592   }
 593 #else
 594   startup_task_runner_->RunAllTasksNow();
 595 #endif
 596 }
 597
 598 int BrowserMainLoop::CreateThreads() {
 599   TRACE_EVENT0("startup", "BrowserMainLoop::CreateThreads");
 600
 601   base::Thread::Options io_message_loop_options;
 602   io_message_loop_options.message_loop_type = base::MessageLoop::TYPE_IO;
 603   base::Thread::Options ui_message_loop_options;
 604   ui_message_loop_options.message_loop_type = base::MessageLoop::TYPE_UI;
 605
 606   // Start threads in the order they occur in the BrowserThread::ID
 607   // enumeration, except for BrowserThread::UI which is the main
 608   // thread.
 609   //
 610   // Must be size_t so we can increment it.
 611   for (size_t thread_id = BrowserThread::UI + 1;
 612        thread_id < BrowserThread::ID_COUNT;
 613        ++thread_id) {
 614     scoped_ptr<BrowserProcessSubThread>* thread_to_start = NULL;
 615     base::Thread::Options options;
 616
 617     switch (thread_id) {
 618       case BrowserThread::DB:
 619         TRACE_EVENT_BEGIN1("startup",
 620             "BrowserMainLoop::CreateThreads:start",
 621             "Thread", "BrowserThread::DB");
 622         thread_to_start = &db_thread_;
 623         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 624         break;
 625       case BrowserThread::FILE_USER_BLOCKING:
 626         TRACE_EVENT_BEGIN1("startup",
 627             "BrowserMainLoop::CreateThreads:start",
 628             "Thread", "BrowserThread::FILE_USER_BLOCKING");
 629         thread_to_start = &file_user_blocking_thread_;
 630         break;
 631       case BrowserThread::FILE:
 632         TRACE_EVENT_BEGIN1("startup",
 633             "BrowserMainLoop::CreateThreads:start",
 634             "Thread", "BrowserThread::FILE");
 635         thread_to_start = &file_thread_;
 636 #if defined(OS_WIN)
 637         // On Windows, the FILE thread needs to be have a UI message loop
 638         // which pumps messages in such a way that Google Update can
 639         // communicate back to us.
 640         options = ui_message_loop_options;
 641 #else
 642         options = io_message_loop_options;
 643 #endif
 644         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 645         break;
 646       case BrowserThread::PROCESS_LAUNCHER:
 647         TRACE_EVENT_BEGIN1("startup",
 648             "BrowserMainLoop::CreateThreads:start",
 649             "Thread", "BrowserThread::PROCESS_LAUNCHER");
 650         thread_to_start = &process_launcher_thread_;
 651         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 652         break;
 653       case BrowserThread::CACHE:
 654         TRACE_EVENT_BEGIN1("startup",
 655             "BrowserMainLoop::CreateThreads:start",
 656             "Thread", "BrowserThread::CACHE");
 657         thread_to_start = &cache_thread_;
 658         options = io_message_loop_options;
 659         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 660         break;
 661       case BrowserThread::IO:
 662         TRACE_EVENT_BEGIN1("startup",
 663             "BrowserMainLoop::CreateThreads:start",
 664             "Thread", "BrowserThread::IO");
 665         thread_to_start = &io_thread_;
 666         options = io_message_loop_options;
 667         break;
 668       case BrowserThread::UI:
 669       case BrowserThread::ID_COUNT:
 670       default:
 671         NOTREACHED();
 672         break;
 673     }
 674
 675     BrowserThread::ID id = static_cast<BrowserThread::ID>(thread_id);
 676
 677     if (thread_to_start) {
 678       (*thread_to_start).reset(new BrowserProcessSubThread(id));
 679       (*thread_to_start)->StartWithOptions(options);
 680     } else {
 681       NOTREACHED();
 682     }
 683
 684     TRACE_EVENT_END0("startup", "BrowserMainLoop::CreateThreads:start");
 685   }
 686   created_threads_ = true;
 687   return result_code_;
 688 }
 689
 690 int BrowserMainLoop::PreMainMessageLoopRun() {
 691   if (parts_) {
 692     TRACE_EVENT0("startup",
 693         "BrowserMainLoop::CreateThreads:PreMainMessageLoopRun");
 694     parts_->PreMainMessageLoopRun();
 695   }
 696
 697   // If the UI thread blocks, the whole UI is unresponsive.
 698   // Do not allow disk IO from the UI thread.
 699   base::ThreadRestrictions::SetIOAllowed(false);
 700   base::ThreadRestrictions::DisallowWaiting();
 701   return result_code_;
 702 }
 703
 704 void BrowserMainLoop::RunMainMessageLoopParts() {
 705   TRACE_EVENT_BEGIN_ETW("BrowserMain:MESSAGE_LOOP", 0, "");
 706
 707   bool ran_main_loop = false;
 708   if (parts_)
 709     ran_main_loop = parts_->MainMessageLoopRun(&result_code_);
 710
 711   if (!ran_main_loop)
 712     MainMessageLoopRun();
 713
 714   TRACE_EVENT_END_ETW("BrowserMain:MESSAGE_LOOP", 0, "");
 715 }
 716
 717 void BrowserMainLoop::ShutdownThreadsAndCleanUp() {
 718   if (!created_threads_) {
 719     // Called early, nothing to do
 720     return;
 721   }
 722   TRACE_EVENT0("shutdown", "BrowserMainLoop::ShutdownThreadsAndCleanUp");
 723
 724   // Teardown may start in PostMainMessageLoopRun, and during teardown we
 725   // need to be able to perform IO.
 726   base::ThreadRestrictions::SetIOAllowed(true);
 727   BrowserThread::PostTask(
 728       BrowserThread::IO, FROM_HERE,
 729       base::Bind(base::IgnoreResult(&base::ThreadRestrictions::SetIOAllowed),
 730                  true));
 731
 732 #if !defined(OS_IOS)
 733   if (RenderProcessHost::run_renderer_in_process())
 734     RenderProcessHostImpl::ShutDownInProcessRenderer();
 735 #endif
 736
 737   if (parts_) {
 738     TRACE_EVENT0("shutdown",
 739                  "BrowserMainLoop::Subsystem:PostMainMessageLoopRun");
 740     parts_->PostMainMessageLoopRun();
 741   }
 742
 743   trace_memory_controller_.reset();
 744   system_stats_monitor_.reset();
 745
 746 #if !defined(OS_IOS)
 747   // Destroying the GpuProcessHostUIShims on the UI thread posts a task to
 748   // delete related objects on the GPU thread. This must be done before
 749   // stopping the GPU thread. The GPU thread will close IPC channels to renderer
 750   // processes so this has to happen before stopping the IO thread.
 751   {
 752     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:GPUProcessHostShim");
 753     GpuProcessHostUIShim::DestroyAll();
 754   }
 755   // Cancel pending requests and prevent new requests.
 756   if (resource_dispatcher_host_) {
 757     TRACE_EVENT0("shutdown",
 758                  "BrowserMainLoop::Subsystem:ResourceDispatcherHost");
 759     resource_dispatcher_host_.get()->Shutdown();
 760   }
 761
 762 #if defined(USE_AURA) || defined(OS_MACOSX)
 763   if (ShouldInitializeBrowserGpuChannelAndTransportSurface()) {
 764     TRACE_EVENT0("shutdown",
 765                  "BrowserMainLoop::Subsystem:ImageTransportFactory");
 766     ImageTransportFactory::Terminate();
 767   }
 768 #endif
 769
 770 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 771   ZygoteHostImpl::GetInstance()->TearDownAfterLastChild();
 772 #endif  // defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 773
 774   // The device monitors are using |system_monitor_| as dependency, so delete
 775   // them before |system_monitor_| goes away.
 776   // On Mac and windows, the monitor needs to be destroyed on the same thread
 777   // as they were created. On Linux, the monitor will be deleted when IO thread
 778   // goes away.
 779 #if defined(OS_WIN)
 780   system_message_window_.reset();
 781 #elif defined(OS_MACOSX)
 782   device_monitor_mac_.reset();
 783 #endif
 784 #endif  // !defined(OS_IOS)
 785
 786   // Must be size_t so we can subtract from it.
 787   for (size_t thread_id = BrowserThread::ID_COUNT - 1;
 788        thread_id >= (BrowserThread::UI + 1);
 789        --thread_id) {
 790     // Find the thread object we want to stop. Looping over all valid
 791     // BrowserThread IDs and DCHECKing on a missing case in the switch
 792     // statement helps avoid a mismatch between this code and the
 793     // BrowserThread::ID enumeration.
 794     //
 795     // The destruction order is the reverse order of occurrence in the
 796     // BrowserThread::ID list. The rationale for the order is as
 797     // follows (need to be filled in a bit):
 798     //
 799     //
 800     // - The IO thread is the only user of the CACHE thread.
 801     //
 802     // - The PROCESS_LAUNCHER thread must be stopped after IO in case
 803     //   the IO thread posted a task to terminate a process on the
 804     //   process launcher thread.
 805     //
 806     // - (Not sure why DB stops last.)
 807     switch (thread_id) {
 808       case BrowserThread::DB: {
 809           TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:DBThread");
 810           db_thread_.reset();
 811         }
 812         break;
 813       case BrowserThread::FILE_USER_BLOCKING: {
 814           TRACE_EVENT0("shutdown",
 815                        "BrowserMainLoop::Subsystem:FileUserBlockingThread");
 816           file_user_blocking_thread_.reset();
 817         }
 818         break;
 819       case BrowserThread::FILE: {
 820           TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:FileThread");
 821 #if !defined(OS_IOS)
 822           // Clean up state that lives on or uses the file_thread_ before
 823           // it goes away.
 824           if (resource_dispatcher_host_)
 825             resource_dispatcher_host_.get()->save_file_manager()->Shutdown();
 826 #endif  // !defined(OS_IOS)
 827           file_thread_.reset();
 828         }
 829         break;
 830       case BrowserThread::PROCESS_LAUNCHER: {
 831           TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:LauncherThread");
 832           process_launcher_thread_.reset();
 833         }
 834         break;
 835       case BrowserThread::CACHE: {
 836           TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:CacheThread");
 837           cache_thread_.reset();
 838         }
 839         break;
 840       case BrowserThread::IO: {
 841           TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:IOThread");
 842           io_thread_.reset();
 843         }
 844         break;
 845       case BrowserThread::UI:
 846       case BrowserThread::ID_COUNT:
 847       default:
 848         NOTREACHED();
 849         break;
 850     }
 851   }
 852
 853 #if !defined(OS_IOS)
 854   {
 855     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:IndexedDBThread");
 856     indexed_db_thread_.reset();
 857   }
 858 #endif
 859
 860   // Close the blocking I/O pool after the other threads. Other threads such
 861   // as the I/O thread may need to schedule work like closing files or flushing
 862   // data during shutdown, so the blocking pool needs to be available. There
 863   // may also be slow operations pending that will blcok shutdown, so closing
 864   // it here (which will block until required operations are complete) gives
 865   // more head start for those operations to finish.
 866   {
 867     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:ThreadPool");
 868     BrowserThreadImpl::ShutdownThreadPool();
 869   }
 870
 871 #if !defined(OS_IOS)
 872   // Must happen after the IO thread is shutdown since this may be accessed from
 873   // it.
 874   {
 875     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:GPUChannelFactory");
 876     if (BrowserGpuChannelHostFactory::instance())
 877       BrowserGpuChannelHostFactory::Terminate();
 878   }
 879
 880   // Must happen after the I/O thread is shutdown since this class lives on the
 881   // I/O thread and isn't threadsafe.
 882   {
 883     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:GamepadService");
 884     GamepadService::GetInstance()->Terminate();
 885   }
 886   {
 887     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:SensorService");
 888     DeviceInertialSensorService::GetInstance()->Shutdown();
 889   }
 890   {
 891     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:BatteryStatusService");
 892     BatteryStatusService::GetInstance()->Shutdown();
 893   }
 894   {
 895     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:DeleteDataSources");
 896     URLDataManager::DeleteDataSources();
 897   }
 898 #endif  // !defined(OS_IOS)
 899
 900   if (parts_) {
 901     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:PostDestroyThreads");
 902     parts_->PostDestroyThreads();
 903   }
 904 }
 905
 906 void BrowserMainLoop::StopStartupTracingTimer() {
 907   startup_trace_timer_.Stop();
 908 }
 909
 910 void BrowserMainLoop::InitializeMainThread() {
 911   TRACE_EVENT0("startup", "BrowserMainLoop::InitializeMainThread");
 912   const char* kThreadName = "CrBrowserMain";
 913   base::PlatformThread::SetName(kThreadName);
 914   if (main_message_loop_)
 915     main_message_loop_->set_thread_name(kThreadName);
 916
 917   // Register the main thread by instantiating it, but don't call any methods.
 918   main_thread_.reset(
 919       new BrowserThreadImpl(BrowserThread::UI, base::MessageLoop::current()));
 920 }
 921
 922 int BrowserMainLoop::BrowserThreadsStarted() {
 923   TRACE_EVENT0("startup", "BrowserMainLoop::BrowserThreadsStarted");
 924
 925 #if !defined(OS_IOS)
 926   indexed_db_thread_.reset(new base::Thread("IndexedDB"));
 927   indexed_db_thread_->Start();
 928 #endif
 929
 930 #if defined(OS_ANDROID)
 931   // Up the priority of anything that touches with display tasks
 932   // (this thread is UI thread, and io_thread_ is for IPCs).
 933   io_thread_->SetPriority(base::kThreadPriority_Display);
 934   base::PlatformThread::SetThreadPriority(
 935       base::PlatformThread::CurrentHandle(),
 936       base::kThreadPriority_Display);
 937 #endif
 938
 939 #if !defined(OS_IOS)
 940   HistogramSynchronizer::GetInstance();
 941
 942   bool initialize_gpu_data_manager = true;
 943 #if defined(OS_ANDROID)
 944   // On Android, GLSurface::InitializeOneOff() must be called before initalizing
 945   // the GpuDataManagerImpl as it uses the GL bindings. crbug.com/326295
 946   if (!gfx::GLSurface::InitializeOneOff()) {
 947     LOG(ERROR) << "GLSurface::InitializeOneOff failed";
 948     initialize_gpu_data_manager = false;
 949   }
 950 #endif
 951
 952   // Initialize the GpuDataManager before we set up the MessageLoops because
 953   // otherwise we'll trigger the assertion about doing IO on the UI thread.
 954   if (initialize_gpu_data_manager)
 955     GpuDataManagerImpl::GetInstance()->Initialize();
 956
 957   bool always_uses_gpu = true;
 958   bool established_gpu_channel = false;
 959 #if defined(USE_AURA) || defined(OS_MACOSX)
 960   if (ShouldInitializeBrowserGpuChannelAndTransportSurface()) {
 961     established_gpu_channel = true;
 962     if (!GpuDataManagerImpl::GetInstance()->CanUseGpuBrowserCompositor()) {
 963       established_gpu_channel = always_uses_gpu = false;
 964     }
 965     BrowserGpuChannelHostFactory::Initialize(established_gpu_channel);
 966     ImageTransportFactory::Initialize();
 967 #if defined(USE_AURA)
 968     if (aura::Env::GetInstance()) {
 969       aura::Env::GetInstance()->set_context_factory(
 970           content::GetContextFactory());
 971     }
 972 #endif
 973   }
 974 #elif defined(OS_ANDROID)
 975   established_gpu_channel = true;
 976   BrowserGpuChannelHostFactory::Initialize(established_gpu_channel);
 977 #endif
 978
 979 #if defined(OS_LINUX) && defined(USE_UDEV)
 980   device_monitor_linux_.reset(new DeviceMonitorLinux());
 981 #elif defined(OS_MACOSX)
 982   device_monitor_mac_.reset(new DeviceMonitorMac());
 983 #endif
 984
 985   // RDH needs the IO thread to be created
 986   {
 987     TRACE_EVENT0("startup",
 988       "BrowserMainLoop::BrowserThreadsStarted:InitResourceDispatcherHost");
 989     resource_dispatcher_host_.reset(new ResourceDispatcherHostImpl());
 990   }
 991
 992   // MediaStreamManager needs the IO thread to be created.
 993   {
 994     TRACE_EVENT0("startup",
 995       "BrowserMainLoop::BrowserThreadsStarted:InitMediaStreamManager");
 996     media_stream_manager_.reset(new MediaStreamManager(audio_manager_.get()));
 997   }
 998
 999   {
1000     TRACE_EVENT0("startup",
1001       "BrowserMainLoop::BrowserThreadsStarted:InitSpeechRecognition");
1002     speech_recognition_manager_.reset(new SpeechRecognitionManagerImpl(
1003         audio_manager_.get(), media_stream_manager_.get()));
1004   }
1005
1006   {
1007     TRACE_EVENT0(
1008         "startup",
1009         "BrowserMainLoop::BrowserThreadsStarted::InitUserInputMonitor");
1010     user_input_monitor_ = media::UserInputMonitor::Create(
1011         io_thread_->message_loop_proxy(), main_thread_->message_loop_proxy());
1012   }
1013
1014   {
1015     TRACE_EVENT0("startup",
1016                  "BrowserMainLoop::BrowserThreadsStarted::TimeZoneMonitor");
1017     time_zone_monitor_ = TimeZoneMonitor::Create();
1018   }
1019
1020   // Alert the clipboard class to which threads are allowed to access the
1021   // clipboard:
1022   std::vector<base::PlatformThreadId> allowed_clipboard_threads;
1023   // The current thread is the UI thread.
1024   allowed_clipboard_threads.push_back(base::PlatformThread::CurrentId());
1025 #if defined(OS_WIN)
1026   // On Windows, clipboards are also used on the File or IO threads.
1027   allowed_clipboard_threads.push_back(file_thread_->thread_id());
1028   allowed_clipboard_threads.push_back(io_thread_->thread_id());
1029 #endif
1030   ui::Clipboard::SetAllowedThreads(allowed_clipboard_threads);
1031
1032   // When running the GPU thread in-process, avoid optimistically starting it
1033   // since creating the GPU thread races against creation of the one-and-only
1034   // ChildProcess instance which is created by the renderer thread.
1035   if (GpuDataManagerImpl::GetInstance()->GpuAccessAllowed(NULL) &&
1036       !established_gpu_channel &&
1037       always_uses_gpu &&
1038       !parsed_command_line_.HasSwitch(switches::kSingleProcess) &&
1039       !parsed_command_line_.HasSwitch(switches::kInProcessGPU)) {
1040     TRACE_EVENT_INSTANT0("gpu", "Post task to launch GPU process",
1041                          TRACE_EVENT_SCOPE_THREAD);
1042     BrowserThread::PostTask(
1043         BrowserThread::IO, FROM_HERE, base::Bind(
1044             base::IgnoreResult(&GpuProcessHost::Get),
1045             GpuProcessHost::GPU_PROCESS_KIND_SANDBOXED,
1046             CAUSE_FOR_GPU_LAUNCH_BROWSER_STARTUP));
1047   }
1048
1049 #if defined(OS_MACOSX)
1050   ThemeHelperMac::GetInstance();
1051   if (ShouldEnableBootstrapSandbox()) {
1052     TRACE_EVENT0("startup",
1053         "BrowserMainLoop::BrowserThreadsStarted:BootstrapSandbox");
1054     CHECK(GetBootstrapSandbox());
1055   }
1056 #endif  // defined(OS_MACOSX)
1057
1058 #endif  // !defined(OS_IOS)
1059
1060   return result_code_;
1061 }
1062
1063 bool BrowserMainLoop::InitializeToolkit() {
1064   TRACE_EVENT0("startup", "BrowserMainLoop::InitializeToolkit");
1065   // TODO(evan): this function is rather subtle, due to the variety
1066   // of intersecting ifdefs we have.  To keep it easy to follow, there
1067   // are no #else branches on any #ifs.
1068   // TODO(stevenjb): Move platform specific code into platform specific Parts
1069   // (Need to add InitializeToolkit stage to BrowserParts).
1070   // See also GTK setup in EarlyInitialization, above, and associated comments.
1071
1072 #if defined(OS_WIN)
1073   // Init common control sex.
1074   INITCOMMONCONTROLSEX config;
1075   config.dwSize = sizeof(config);
1076   config.dwICC = ICC_WIN95_CLASSES;
1077   if (!InitCommonControlsEx(&config))
1078     PLOG(FATAL);
1079 #endif
1080
1081 #if defined(USE_AURA)
1082
1083 #if defined(USE_X11)
1084   if (!gfx::GetXDisplay())
1085     return false;
1086 #endif
1087
1088   // Env creates the compositor. Aura widgets need the compositor to be created
1089   // before they can be initialized by the browser.
1090   aura::Env::CreateInstance(true);
1091 #endif  // defined(USE_AURA)
1092
1093   if (parts_)
1094     parts_->ToolkitInitialized();
1095
1096   return true;
1097 }
1098
1099 void BrowserMainLoop::MainMessageLoopRun() {
1100 #if defined(OS_ANDROID)
1101   // Android's main message loop is the Java message loop.
1102   NOTREACHED();
1103 #else
1104   DCHECK(base::MessageLoopForUI::IsCurrent());
1105   if (parameters_.ui_task)
1106     base::MessageLoopForUI::current()->PostTask(FROM_HERE,
1107                                                 *parameters_.ui_task);
1108
1109   base::RunLoop run_loop;
1110   run_loop.Run();
1111 #endif
1112 }
1113
1114 base::FilePath BrowserMainLoop::GetStartupTraceFileName(
1115     const base::CommandLine& command_line) const {
1116   base::FilePath trace_file = command_line.GetSwitchValuePath(
1117       switches::kTraceStartupFile);
1118   // trace_file = "none" means that startup events will show up for the next
1119   // begin/end tracing (via about:tracing or AutomationProxy::BeginTracing/
1120   // EndTracing, for example).
1121   if (trace_file == base::FilePath().AppendASCII("none"))
1122     return trace_file;
1123
1124   if (trace_file.empty()) {
1125 #if defined(OS_ANDROID)
1126     TracingControllerAndroid::GenerateTracingFilePath(&trace_file);
1127 #else
1128     // Default to saving the startup trace into the current dir.
1129     trace_file = base::FilePath().AppendASCII("chrometrace.log");
1130 #endif
1131   }
1132
1133   return trace_file;
1134 }
1135
1136 void BrowserMainLoop::InitStartupTracing(const CommandLine& command_line) {
1137   DCHECK(is_tracing_startup_);
1138
1139   startup_trace_file_ = GetStartupTraceFileName(parsed_command_line_);
1140
1141   std::string delay_str = command_line.GetSwitchValueASCII(
1142       switches::kTraceStartupDuration);
1143   int delay_secs = 5;
1144   if (!delay_str.empty() && !base::StringToInt(delay_str, &delay_secs)) {
1145     DLOG(WARNING) << "Could not parse --" << switches::kTraceStartupDuration
1146         << "=" << delay_str << " defaulting to 5 (secs)";
1147     delay_secs = 5;
1148   }
1149
1150   startup_trace_timer_.Start(FROM_HERE,
1151                              base::TimeDelta::FromSeconds(delay_secs),
1152                              this,
1153                              &BrowserMainLoop::EndStartupTracing);
1154 }
1155
1156 void BrowserMainLoop::EndStartupTracing() {
1157   is_tracing_startup_ = false;
1158   TracingController::GetInstance()->DisableRecording(
1159       startup_trace_file_, base::Bind(&OnStoppedStartupTracing));
1160 }
1161
1162 }  // namespace content