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/cocoa/system_hotkey_helper_mac.h"
  90 #include "content/browser/theme_helper_mac.h"
  91 #endif
  92
  93 #if defined(OS_WIN)
  94 #include <windows.h>
  95 #include <commctrl.h>
  96 #include <shellapi.h>
  97
  98 #include "content/browser/system_message_window_win.h"
  99 #include "content/common/sandbox_win.h"
 100 #include "net/base/winsock_init.h"
 101 #include "ui/base/l10n/l10n_util_win.h"
 102 #endif
 103
 104 #if defined(USE_GLIB)
 105 #include <glib-object.h>
 106 #endif
 107
 108 #if defined(OS_LINUX) && defined(USE_UDEV)
 109 #include "content/browser/device_monitor_udev.h"
 110 #elif defined(OS_MACOSX) && !defined(OS_IOS)
 111 #include "content/browser/device_monitor_mac.h"
 112 #endif
 113
 114 #if defined(OS_POSIX) && !defined(OS_MACOSX)
 115 #include "content/browser/renderer_host/render_sandbox_host_linux.h"
 116 #include "content/browser/zygote_host/zygote_host_impl_linux.h"
 117 #include "sandbox/linux/suid/client/setuid_sandbox_client.h"
 118 #endif
 119
 120 #if defined(TCMALLOC_TRACE_MEMORY_SUPPORTED)
 121 #include "third_party/tcmalloc/chromium/src/gperftools/heap-profiler.h"
 122 #endif
 123
 124 #if defined(USE_X11)
 125 #include "ui/gfx/x/x11_connection.h"
 126 #include "ui/gfx/x/x11_types.h"
 127 #endif
 128
 129 // One of the linux specific headers defines this as a macro.
 130 #ifdef DestroyAll
 131 #undef DestroyAll
 132 #endif
 133
 134 namespace content {
 135 namespace {
 136
 137 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 138 void SetupSandbox(const base::CommandLine& parsed_command_line) {
 139   TRACE_EVENT0("startup", "SetupSandbox");
 140   base::FilePath sandbox_binary;
 141
 142   scoped_ptr<sandbox::SetuidSandboxClient> setuid_sandbox_client(
 143       sandbox::SetuidSandboxClient::Create());
 144
 145   const bool want_setuid_sandbox =
 146       !parsed_command_line.HasSwitch(switches::kNoSandbox) &&
 147       !parsed_command_line.HasSwitch(switches::kDisableSetuidSandbox) &&
 148       !setuid_sandbox_client->IsDisabledViaEnvironment();
 149
 150   static const char no_suid_error[] =
 151       "Running without the SUID sandbox! See "
 152       "https://code.google.com/p/chromium/wiki/LinuxSUIDSandboxDevelopment "
 153       "for more information on developing with the sandbox on.";
 154   if (want_setuid_sandbox) {
 155     sandbox_binary = setuid_sandbox_client->GetSandboxBinaryPath();
 156     if (sandbox_binary.empty()) {
 157       // This needs to be fatal. Talk to security@chromium.org if you feel
 158       // otherwise.
 159       LOG(FATAL) << no_suid_error;
 160     }
 161   } else {
 162     LOG(ERROR) << no_suid_error;
 163   }
 164
 165   // Tickle the sandbox host and zygote host so they fork now.
 166   RenderSandboxHostLinux::GetInstance()->Init();
 167   ZygoteHostImpl::GetInstance()->Init(sandbox_binary.value());
 168 }
 169 #endif
 170
 171 #if defined(USE_GLIB)
 172 static void GLibLogHandler(const gchar* log_domain,
 173                            GLogLevelFlags log_level,
 174                            const gchar* message,
 175                            gpointer userdata) {
 176   if (!log_domain)
 177     log_domain = "<unknown>";
 178   if (!message)
 179     message = "<no message>";
 180
 181   if (strstr(message, "Unable to retrieve the file info for")) {
 182     LOG(ERROR) << "GTK File code error: " << message;
 183   } else if (strstr(message, "Could not find the icon") &&
 184              strstr(log_domain, "Gtk")) {
 185     LOG(ERROR) << "GTK icon error: " << message;
 186   } else if (strstr(message, "Theme file for default has no") ||
 187              strstr(message, "Theme directory") ||
 188              strstr(message, "theme pixmap") ||
 189              strstr(message, "locate theme engine")) {
 190     LOG(ERROR) << "GTK theme error: " << message;
 191   } else if (strstr(message, "Unable to create Ubuntu Menu Proxy") &&
 192              strstr(log_domain, "<unknown>")) {
 193     LOG(ERROR) << "GTK menu proxy create failed";
 194   } else if (strstr(message, "Out of memory") &&
 195              strstr(log_domain, "<unknown>")) {
 196     LOG(ERROR) << "DBus call timeout or out of memory: "
 197                << "http://crosbug.com/15496";
 198   } else if (strstr(message, "Could not connect: Connection refused") &&
 199              strstr(log_domain, "<unknown>")) {
 200     LOG(ERROR) << "DConf settings backend could not connect to session bus: "
 201                << "http://crbug.com/179797";
 202   } else if (strstr(message, "Attempting to store changes into") ||
 203              strstr(message, "Attempting to set the permissions of")) {
 204     LOG(ERROR) << message << " (http://bugs.chromium.org/161366)";
 205   } else if (strstr(message, "drawable is not a native X11 window")) {
 206     LOG(ERROR) << message << " (http://bugs.chromium.org/329991)";
 207   } else {
 208     LOG(DFATAL) << log_domain << ": " << message;
 209   }
 210 }
 211
 212 static void SetUpGLibLogHandler() {
 213   // Register GLib-handled assertions to go through our logging system.
 214   const char* kLogDomains[] = { NULL, "Gtk", "Gdk", "GLib", "GLib-GObject" };
 215   for (size_t i = 0; i < arraysize(kLogDomains); i++) {
 216     g_log_set_handler(kLogDomains[i],
 217                       static_cast<GLogLevelFlags>(G_LOG_FLAG_RECURSION |
 218                                                   G_LOG_FLAG_FATAL |
 219                                                   G_LOG_LEVEL_ERROR |
 220                                                   G_LOG_LEVEL_CRITICAL |
 221                                                   G_LOG_LEVEL_WARNING),
 222                       GLibLogHandler,
 223                       NULL);
 224   }
 225 }
 226 #endif
 227
 228 void OnStoppedStartupTracing(const base::FilePath& trace_file) {
 229   VLOG(0) << "Completed startup tracing to " << trace_file.value();
 230 }
 231
 232 #if defined(USE_AURA)
 233 bool ShouldInitializeBrowserGpuChannelAndTransportSurface() {
 234   return true;
 235 }
 236 #elif defined(OS_MACOSX) && !defined(OS_IOS)
 237 bool ShouldInitializeBrowserGpuChannelAndTransportSurface() {
 238   return IsDelegatedRendererEnabled();
 239 }
 240 #endif
 241
 242 }  // namespace
 243
 244 // The currently-running BrowserMainLoop.  There can be one or zero.
 245 BrowserMainLoop* g_current_browser_main_loop = NULL;
 246
 247 // This is just to be able to keep ShutdownThreadsAndCleanUp out of
 248 // the public interface of BrowserMainLoop.
 249 class BrowserShutdownImpl {
 250  public:
 251   static void ImmediateShutdownAndExitProcess() {
 252     DCHECK(g_current_browser_main_loop);
 253     g_current_browser_main_loop->ShutdownThreadsAndCleanUp();
 254
 255 #if defined(OS_WIN)
 256     // At this point the message loop is still running yet we've shut everything
 257     // down. If any messages are processed we'll likely crash. Exit now.
 258     ExitProcess(RESULT_CODE_NORMAL_EXIT);
 259 #elif defined(OS_POSIX) && !defined(OS_MACOSX)
 260     _exit(RESULT_CODE_NORMAL_EXIT);
 261 #else
 262     NOTIMPLEMENTED();
 263 #endif
 264   }
 265 };
 266
 267 void ImmediateShutdownAndExitProcess() {
 268   BrowserShutdownImpl::ImmediateShutdownAndExitProcess();
 269 }
 270
 271 // For measuring memory usage after each task. Behind a command line flag.
 272 class BrowserMainLoop::MemoryObserver : public base::MessageLoop::TaskObserver {
 273  public:
 274   MemoryObserver() {}
 275   virtual ~MemoryObserver() {}
 276
 277   virtual void WillProcessTask(const base::PendingTask& pending_task) OVERRIDE {
 278   }
 279
 280   virtual void DidProcessTask(const base::PendingTask& pending_task) OVERRIDE {
 281 #if !defined(OS_IOS)  // No ProcessMetrics on IOS.
 282     scoped_ptr<base::ProcessMetrics> process_metrics(
 283         base::ProcessMetrics::CreateProcessMetrics(
 284 #if defined(OS_MACOSX)
 285             base::GetCurrentProcessHandle(), NULL));
 286 #else
 287             base::GetCurrentProcessHandle()));
 288 #endif
 289     size_t private_bytes;
 290     process_metrics->GetMemoryBytes(&private_bytes, NULL);
 291     HISTOGRAM_MEMORY_KB("Memory.BrowserUsed", private_bytes >> 10);
 292 #endif
 293   }
 294  private:
 295   DISALLOW_COPY_AND_ASSIGN(MemoryObserver);
 296 };
 297
 298
 299 // BrowserMainLoop construction / destruction =============================
 300
 301 BrowserMainLoop* BrowserMainLoop::GetInstance() {
 302   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 303   return g_current_browser_main_loop;
 304 }
 305
 306 BrowserMainLoop::BrowserMainLoop(const MainFunctionParams& parameters)
 307     : parameters_(parameters),
 308       parsed_command_line_(parameters.command_line),
 309       result_code_(RESULT_CODE_NORMAL_EXIT),
 310       created_threads_(false),
 311       // ContentMainRunner should have enabled tracing of the browser process
 312       // when kTraceStartup is in the command line.
 313       is_tracing_startup_(
 314           parameters.command_line.HasSwitch(switches::kTraceStartup)) {
 315   DCHECK(!g_current_browser_main_loop);
 316   g_current_browser_main_loop = this;
 317 }
 318
 319 BrowserMainLoop::~BrowserMainLoop() {
 320   DCHECK_EQ(this, g_current_browser_main_loop);
 321 #if !defined(OS_IOS)
 322   ui::Clipboard::DestroyClipboardForCurrentThread();
 323 #endif  // !defined(OS_IOS)
 324   g_current_browser_main_loop = NULL;
 325 }
 326
 327 void BrowserMainLoop::Init() {
 328   TRACE_EVENT0("startup", "BrowserMainLoop::Init");
 329   parts_.reset(
 330       GetContentClient()->browser()->CreateBrowserMainParts(parameters_));
 331 }
 332
 333 // BrowserMainLoop stages ==================================================
 334
 335 void BrowserMainLoop::EarlyInitialization() {
 336   TRACE_EVENT0("startup", "BrowserMainLoop::EarlyInitialization");
 337
 338 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 339   // No thread should be created before this call, as SetupSandbox()
 340   // will end-up using fork().
 341   SetupSandbox(parsed_command_line_);
 342 #endif
 343
 344 #if defined(USE_X11)
 345   if (parsed_command_line_.HasSwitch(switches::kSingleProcess) ||
 346       parsed_command_line_.HasSwitch(switches::kInProcessGPU)) {
 347     if (!gfx::InitializeThreadedX11()) {
 348       LOG(ERROR) << "Failed to put Xlib into threaded mode.";
 349     }
 350   }
 351 #endif
 352
 353   // GLib's spawning of new processes is buggy, so it's important that at this
 354   // point GLib does not need to start DBUS. Chrome should always start with
 355   // DBUS_SESSION_BUS_ADDRESS properly set. See crbug.com/309093.
 356 #if defined(USE_GLIB)
 357   // g_type_init will be deprecated in 2.36. 2.35 is the development
 358   // version for 2.36, hence do not call g_type_init starting 2.35.
 359   // http://developer.gnome.org/gobject/unstable/gobject-Type-Information.html#g-type-init
 360 #if !GLIB_CHECK_VERSION(2, 35, 0)
 361   // GLib type system initialization. Needed at least for gconf,
 362   // used in net/proxy/proxy_config_service_linux.cc. Most likely
 363   // this is superfluous as gtk_init() ought to do this. It's
 364   // definitely harmless, so retained as a reminder of this
 365   // requirement for gconf.
 366   g_type_init();
 367 #endif
 368
 369   SetUpGLibLogHandler();
 370 #endif
 371
 372   if (parts_)
 373     parts_->PreEarlyInitialization();
 374
 375 #if defined(OS_MACOSX)
 376   // We use quite a few file descriptors for our IPC, and the default limit on
 377   // the Mac is low (256), so bump it up.
 378   base::SetFdLimit(1024);
 379 #endif
 380
 381 #if defined(OS_WIN)
 382   net::EnsureWinsockInit();
 383 #endif
 384
 385 #if !defined(USE_OPENSSL)
 386   // We want to be sure to init NSPR on the main thread.
 387   crypto::EnsureNSPRInit();
 388 #endif  // !defined(USE_OPENSSL)
 389
 390 #if !defined(OS_IOS)
 391   if (parsed_command_line_.HasSwitch(switches::kRendererProcessLimit)) {
 392     std::string limit_string = parsed_command_line_.GetSwitchValueASCII(
 393         switches::kRendererProcessLimit);
 394     size_t process_limit;
 395     if (base::StringToSizeT(limit_string, &process_limit)) {
 396       RenderProcessHost::SetMaxRendererProcessCount(process_limit);
 397     }
 398   }
 399 #endif  // !defined(OS_IOS)
 400
 401   if (parts_)
 402     parts_->PostEarlyInitialization();
 403 }
 404
 405 void BrowserMainLoop::MainMessageLoopStart() {
 406   TRACE_EVENT0("startup", "BrowserMainLoop::MainMessageLoopStart");
 407   if (parts_) {
 408     TRACE_EVENT0("startup",
 409         "BrowserMainLoop::MainMessageLoopStart:PreMainMessageLoopStart");
 410     parts_->PreMainMessageLoopStart();
 411   }
 412
 413 #if defined(OS_WIN)
 414   // If we're running tests (ui_task is non-null), then the ResourceBundle
 415   // has already been initialized.
 416   if (!parameters_.ui_task) {
 417     // Override the configured locale with the user's preferred UI language.
 418     l10n_util::OverrideLocaleWithUILanguageList();
 419   }
 420 #endif
 421
 422   // Create a MessageLoop if one does not already exist for the current thread.
 423   if (!base::MessageLoop::current())
 424     main_message_loop_.reset(new base::MessageLoopForUI);
 425
 426   InitializeMainThread();
 427
 428   {
 429     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:SystemMonitor");
 430     system_monitor_.reset(new base::SystemMonitor);
 431   }
 432   {
 433     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:PowerMonitor");
 434     scoped_ptr<base::PowerMonitorSource> power_monitor_source(
 435       new base::PowerMonitorDeviceSource());
 436     power_monitor_.reset(new base::PowerMonitor(power_monitor_source.Pass()));
 437   }
 438   {
 439     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:HighResTimerManager");
 440     hi_res_timer_manager_.reset(new base::HighResolutionTimerManager);
 441   }
 442   {
 443     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:NetworkChangeNotifier");
 444     network_change_notifier_.reset(net::NetworkChangeNotifier::Create());
 445   }
 446
 447 #if !defined(OS_IOS)
 448   {
 449     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:MediaFeatures");
 450     media::InitializeCPUSpecificMediaFeatures();
 451   }
 452   {
 453     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:AudioMan");
 454     audio_manager_.reset(media::AudioManager::Create(
 455         MediaInternals::GetInstance()));
 456   }
 457   {
 458     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:MidiManager");
 459     midi_manager_.reset(media::MidiManager::Create());
 460   }
 461   {
 462     TRACE_EVENT0("startup",
 463                  "BrowserMainLoop::Subsystem:ContentWebUIController");
 464     WebUIControllerFactory::RegisterFactory(
 465         ContentWebUIControllerFactory::GetInstance());
 466   }
 467
 468   {
 469     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:AudioMirroringManager");
 470     audio_mirroring_manager_.reset(new AudioMirroringManager());
 471   }
 472   {
 473     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:OnlineStateObserver");
 474     online_state_observer_.reset(new BrowserOnlineStateObserver);
 475   }
 476
 477   {
 478     system_stats_monitor_.reset(new base::debug::TraceEventSystemStatsMonitor(
 479         base::ThreadTaskRunnerHandle::Get()));
 480   }
 481 #endif  // !defined(OS_IOS)
 482
 483 #if defined(OS_WIN)
 484   system_message_window_.reset(new SystemMessageWindowWin);
 485 #endif
 486
 487   if (parts_)
 488     parts_->PostMainMessageLoopStart();
 489
 490 #if !defined(OS_IOS)
 491   // Start tracing to a file if needed. Only do this after starting the main
 492   // message loop to avoid calling MessagePumpForUI::ScheduleWork() before
 493   // MessagePumpForUI::Start() as it will crash the browser.
 494   if (is_tracing_startup_) {
 495     TRACE_EVENT0("startup", "BrowserMainLoop::InitStartupTracing");
 496     InitStartupTracing(parsed_command_line_);
 497   }
 498 #endif  // !defined(OS_IOS)
 499
 500 #if defined(OS_ANDROID)
 501   {
 502     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:SurfaceTexturePeer");
 503     SurfaceTexturePeer::InitInstance(new SurfaceTexturePeerBrowserImpl());
 504   }
 505 #endif
 506
 507   if (parsed_command_line_.HasSwitch(switches::kMemoryMetrics)) {
 508     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:MemoryObserver");
 509     memory_observer_.reset(new MemoryObserver());
 510     base::MessageLoop::current()->AddTaskObserver(memory_observer_.get());
 511   }
 512
 513 #if defined(TCMALLOC_TRACE_MEMORY_SUPPORTED)
 514   trace_memory_controller_.reset(new base::debug::TraceMemoryController(
 515       base::MessageLoop::current()->message_loop_proxy(),
 516       ::HeapProfilerWithPseudoStackStart,
 517       ::HeapProfilerStop,
 518       ::GetHeapProfile));
 519 #endif
 520 }
 521
 522 int BrowserMainLoop::PreCreateThreads() {
 523   if (parts_) {
 524     TRACE_EVENT0("startup",
 525         "BrowserMainLoop::CreateThreads:PreCreateThreads");
 526     result_code_ = parts_->PreCreateThreads();
 527   }
 528
 529 #if defined(ENABLE_PLUGINS)
 530   // Prior to any processing happening on the io thread, we create the
 531   // plugin service as it is predominantly used from the io thread,
 532   // but must be created on the main thread. The service ctor is
 533   // inexpensive and does not invoke the io_thread() accessor.
 534   {
 535     TRACE_EVENT0("startup", "BrowserMainLoop::CreateThreads:PluginService");
 536     PluginService::GetInstance()->Init();
 537   }
 538 #endif
 539
 540 #if !defined(OS_IOS) && (!defined(GOOGLE_CHROME_BUILD) || defined(OS_ANDROID))
 541   // Single-process is an unsupported and not fully tested mode, so
 542   // don't enable it for official Chrome builds (except on Android).
 543   if (parsed_command_line_.HasSwitch(switches::kSingleProcess))
 544     RenderProcessHost::SetRunRendererInProcess(true);
 545 #endif
 546   return result_code_;
 547 }
 548
 549 void BrowserMainLoop::CreateStartupTasks() {
 550   TRACE_EVENT0("startup", "BrowserMainLoop::CreateStartupTasks");
 551
 552   // First time through, we really want to create all the tasks
 553   if (!startup_task_runner_.get()) {
 554 #if defined(OS_ANDROID)
 555     startup_task_runner_ = make_scoped_ptr(new StartupTaskRunner(
 556         base::Bind(&BrowserStartupComplete),
 557         base::MessageLoop::current()->message_loop_proxy()));
 558 #else
 559     startup_task_runner_ = make_scoped_ptr(new StartupTaskRunner(
 560         base::Callback<void(int)>(),
 561         base::MessageLoop::current()->message_loop_proxy()));
 562 #endif
 563     StartupTask pre_create_threads =
 564         base::Bind(&BrowserMainLoop::PreCreateThreads, base::Unretained(this));
 565     startup_task_runner_->AddTask(pre_create_threads);
 566
 567     StartupTask create_threads =
 568         base::Bind(&BrowserMainLoop::CreateThreads, base::Unretained(this));
 569     startup_task_runner_->AddTask(create_threads);
 570
 571     StartupTask browser_thread_started = base::Bind(
 572         &BrowserMainLoop::BrowserThreadsStarted, base::Unretained(this));
 573     startup_task_runner_->AddTask(browser_thread_started);
 574
 575     StartupTask pre_main_message_loop_run = base::Bind(
 576         &BrowserMainLoop::PreMainMessageLoopRun, base::Unretained(this));
 577     startup_task_runner_->AddTask(pre_main_message_loop_run);
 578
 579 #if defined(OS_ANDROID)
 580     if (BrowserMayStartAsynchronously()) {
 581       startup_task_runner_->StartRunningTasksAsync();
 582     }
 583 #endif
 584   }
 585 #if defined(OS_ANDROID)
 586   if (!BrowserMayStartAsynchronously()) {
 587     // A second request for asynchronous startup can be ignored, so
 588     // StartupRunningTasksAsync is only called first time through. If, however,
 589     // this is a request for synchronous startup then it must override any
 590     // previous call for async startup, so we call RunAllTasksNow()
 591     // unconditionally.
 592     startup_task_runner_->RunAllTasksNow();
 593   }
 594 #else
 595   startup_task_runner_->RunAllTasksNow();
 596 #endif
 597 }
 598
 599 int BrowserMainLoop::CreateThreads() {
 600   TRACE_EVENT0("startup", "BrowserMainLoop::CreateThreads");
 601
 602   base::Thread::Options io_message_loop_options;
 603   io_message_loop_options.message_loop_type = base::MessageLoop::TYPE_IO;
 604   base::Thread::Options ui_message_loop_options;
 605   ui_message_loop_options.message_loop_type = base::MessageLoop::TYPE_UI;
 606
 607   // Start threads in the order they occur in the BrowserThread::ID
 608   // enumeration, except for BrowserThread::UI which is the main
 609   // thread.
 610   //
 611   // Must be size_t so we can increment it.
 612   for (size_t thread_id = BrowserThread::UI + 1;
 613        thread_id < BrowserThread::ID_COUNT;
 614        ++thread_id) {
 615     scoped_ptr<BrowserProcessSubThread>* thread_to_start = NULL;
 616     base::Thread::Options options;
 617
 618     switch (thread_id) {
 619       case BrowserThread::DB:
 620         TRACE_EVENT_BEGIN1("startup",
 621             "BrowserMainLoop::CreateThreads:start",
 622             "Thread", "BrowserThread::DB");
 623         thread_to_start = &db_thread_;
 624         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 625         break;
 626       case BrowserThread::FILE_USER_BLOCKING:
 627         TRACE_EVENT_BEGIN1("startup",
 628             "BrowserMainLoop::CreateThreads:start",
 629             "Thread", "BrowserThread::FILE_USER_BLOCKING");
 630         thread_to_start = &file_user_blocking_thread_;
 631         break;
 632       case BrowserThread::FILE:
 633         TRACE_EVENT_BEGIN1("startup",
 634             "BrowserMainLoop::CreateThreads:start",
 635             "Thread", "BrowserThread::FILE");
 636         thread_to_start = &file_thread_;
 637 #if defined(OS_WIN)
 638         // On Windows, the FILE thread needs to be have a UI message loop
 639         // which pumps messages in such a way that Google Update can
 640         // communicate back to us.
 641         options = ui_message_loop_options;
 642 #else
 643         options = io_message_loop_options;
 644 #endif
 645         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 646         break;
 647       case BrowserThread::PROCESS_LAUNCHER:
 648         TRACE_EVENT_BEGIN1("startup",
 649             "BrowserMainLoop::CreateThreads:start",
 650             "Thread", "BrowserThread::PROCESS_LAUNCHER");
 651         thread_to_start = &process_launcher_thread_;
 652         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 653         break;
 654       case BrowserThread::CACHE:
 655         TRACE_EVENT_BEGIN1("startup",
 656             "BrowserMainLoop::CreateThreads:start",
 657             "Thread", "BrowserThread::CACHE");
 658         thread_to_start = &cache_thread_;
 659         options = io_message_loop_options;
 660         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 661         break;
 662       case BrowserThread::IO:
 663         TRACE_EVENT_BEGIN1("startup",
 664             "BrowserMainLoop::CreateThreads:start",
 665             "Thread", "BrowserThread::IO");
 666         thread_to_start = &io_thread_;
 667         options = io_message_loop_options;
 668         break;
 669       case BrowserThread::UI:
 670       case BrowserThread::ID_COUNT:
 671       default:
 672         NOTREACHED();
 673         break;
 674     }
 675
 676     BrowserThread::ID id = static_cast<BrowserThread::ID>(thread_id);
 677
 678     if (thread_to_start) {
 679       (*thread_to_start).reset(new BrowserProcessSubThread(id));
 680       (*thread_to_start)->StartWithOptions(options);
 681     } else {
 682       NOTREACHED();
 683     }
 684
 685     TRACE_EVENT_END0("startup", "BrowserMainLoop::CreateThreads:start");
 686   }
 687   created_threads_ = true;
 688   return result_code_;
 689 }
 690
 691 int BrowserMainLoop::PreMainMessageLoopRun() {
 692   if (parts_) {
 693     TRACE_EVENT0("startup",
 694         "BrowserMainLoop::CreateThreads:PreMainMessageLoopRun");
 695     parts_->PreMainMessageLoopRun();
 696   }
 697
 698   // If the UI thread blocks, the whole UI is unresponsive.
 699   // Do not allow disk IO from the UI thread.
 700   base::ThreadRestrictions::SetIOAllowed(false);
 701   base::ThreadRestrictions::DisallowWaiting();
 702   return result_code_;
 703 }
 704
 705 void BrowserMainLoop::RunMainMessageLoopParts() {
 706   TRACE_EVENT_BEGIN_ETW("BrowserMain:MESSAGE_LOOP", 0, "");
 707
 708   bool ran_main_loop = false;
 709   if (parts_)
 710     ran_main_loop = parts_->MainMessageLoopRun(&result_code_);
 711
 712   if (!ran_main_loop)
 713     MainMessageLoopRun();
 714
 715   TRACE_EVENT_END_ETW("BrowserMain:MESSAGE_LOOP", 0, "");
 716 }
 717
 718 void BrowserMainLoop::ShutdownThreadsAndCleanUp() {
 719   if (!created_threads_) {
 720     // Called early, nothing to do
 721     return;
 722   }
 723   TRACE_EVENT0("shutdown", "BrowserMainLoop::ShutdownThreadsAndCleanUp");
 724
 725   // Teardown may start in PostMainMessageLoopRun, and during teardown we
 726   // need to be able to perform IO.
 727   base::ThreadRestrictions::SetIOAllowed(true);
 728   BrowserThread::PostTask(
 729       BrowserThread::IO, FROM_HERE,
 730       base::Bind(base::IgnoreResult(&base::ThreadRestrictions::SetIOAllowed),
 731                  true));
 732
 733 #if !defined(OS_IOS)
 734   if (RenderProcessHost::run_renderer_in_process())
 735     RenderProcessHostImpl::ShutDownInProcessRenderer();
 736 #endif
 737
 738   if (parts_) {
 739     TRACE_EVENT0("shutdown",
 740                  "BrowserMainLoop::Subsystem:PostMainMessageLoopRun");
 741     parts_->PostMainMessageLoopRun();
 742   }
 743
 744   trace_memory_controller_.reset();
 745   system_stats_monitor_.reset();
 746
 747 #if !defined(OS_IOS)
 748   // Destroying the GpuProcessHostUIShims on the UI thread posts a task to
 749   // delete related objects on the GPU thread. This must be done before
 750   // stopping the GPU thread. The GPU thread will close IPC channels to renderer
 751   // processes so this has to happen before stopping the IO thread.
 752   {
 753     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:GPUProcessHostShim");
 754     GpuProcessHostUIShim::DestroyAll();
 755   }
 756   // Cancel pending requests and prevent new requests.
 757   if (resource_dispatcher_host_) {
 758     TRACE_EVENT0("shutdown",
 759                  "BrowserMainLoop::Subsystem:ResourceDispatcherHost");
 760     resource_dispatcher_host_.get()->Shutdown();
 761   }
 762
 763 #if defined(USE_AURA) || defined(OS_MACOSX)
 764   if (ShouldInitializeBrowserGpuChannelAndTransportSurface()) {
 765     TRACE_EVENT0("shutdown",
 766                  "BrowserMainLoop::Subsystem:ImageTransportFactory");
 767     ImageTransportFactory::Terminate();
 768   }
 769 #endif
 770
 771 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 772   ZygoteHostImpl::GetInstance()->TearDownAfterLastChild();
 773 #endif  // defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 774
 775   // The device monitors are using |system_monitor_| as dependency, so delete
 776   // them before |system_monitor_| goes away.
 777   // On Mac and windows, the monitor needs to be destroyed on the same thread
 778   // as they were created. On Linux, the monitor will be deleted when IO thread
 779   // goes away.
 780 #if defined(OS_WIN)
 781   system_message_window_.reset();
 782 #elif defined(OS_MACOSX)
 783   device_monitor_mac_.reset();
 784 #endif
 785 #endif  // !defined(OS_IOS)
 786
 787   // Must be size_t so we can subtract from it.
 788   for (size_t thread_id = BrowserThread::ID_COUNT - 1;
 789        thread_id >= (BrowserThread::UI + 1);
 790        --thread_id) {
 791     // Find the thread object we want to stop. Looping over all valid
 792     // BrowserThread IDs and DCHECKing on a missing case in the switch
 793     // statement helps avoid a mismatch between this code and the
 794     // BrowserThread::ID enumeration.
 795     //
 796     // The destruction order is the reverse order of occurrence in the
 797     // BrowserThread::ID list. The rationale for the order is as
 798     // follows (need to be filled in a bit):
 799     //
 800     //
 801     // - The IO thread is the only user of the CACHE thread.
 802     //
 803     // - The PROCESS_LAUNCHER thread must be stopped after IO in case
 804     //   the IO thread posted a task to terminate a process on the
 805     //   process launcher thread.
 806     //
 807     // - (Not sure why DB stops last.)
 808     switch (thread_id) {
 809       case BrowserThread::DB: {
 810           TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:DBThread");
 811           db_thread_.reset();
 812         }
 813         break;
 814       case BrowserThread::FILE_USER_BLOCKING: {
 815           TRACE_EVENT0("shutdown",
 816                        "BrowserMainLoop::Subsystem:FileUserBlockingThread");
 817           file_user_blocking_thread_.reset();
 818         }
 819         break;
 820       case BrowserThread::FILE: {
 821           TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:FileThread");
 822 #if !defined(OS_IOS)
 823           // Clean up state that lives on or uses the file_thread_ before
 824           // it goes away.
 825           if (resource_dispatcher_host_)
 826             resource_dispatcher_host_.get()->save_file_manager()->Shutdown();
 827 #endif  // !defined(OS_IOS)
 828           file_thread_.reset();
 829         }
 830         break;
 831       case BrowserThread::PROCESS_LAUNCHER: {
 832           TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:LauncherThread");
 833           process_launcher_thread_.reset();
 834         }
 835         break;
 836       case BrowserThread::CACHE: {
 837           TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:CacheThread");
 838           cache_thread_.reset();
 839         }
 840         break;
 841       case BrowserThread::IO: {
 842           TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:IOThread");
 843           io_thread_.reset();
 844         }
 845         break;
 846       case BrowserThread::UI:
 847       case BrowserThread::ID_COUNT:
 848       default:
 849         NOTREACHED();
 850         break;
 851     }
 852   }
 853
 854 #if !defined(OS_IOS)
 855   {
 856     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:IndexedDBThread");
 857     indexed_db_thread_.reset();
 858   }
 859 #endif
 860
 861   // Close the blocking I/O pool after the other threads. Other threads such
 862   // as the I/O thread may need to schedule work like closing files or flushing
 863   // data during shutdown, so the blocking pool needs to be available. There
 864   // may also be slow operations pending that will blcok shutdown, so closing
 865   // it here (which will block until required operations are complete) gives
 866   // more head start for those operations to finish.
 867   {
 868     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:ThreadPool");
 869     BrowserThreadImpl::ShutdownThreadPool();
 870   }
 871
 872 #if !defined(OS_IOS)
 873   // Must happen after the IO thread is shutdown since this may be accessed from
 874   // it.
 875   {
 876     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:GPUChannelFactory");
 877     if (BrowserGpuChannelHostFactory::instance())
 878       BrowserGpuChannelHostFactory::Terminate();
 879   }
 880
 881   // Must happen after the I/O thread is shutdown since this class lives on the
 882   // I/O thread and isn't threadsafe.
 883   {
 884     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:GamepadService");
 885     GamepadService::GetInstance()->Terminate();
 886   }
 887   {
 888     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:SensorService");
 889     DeviceInertialSensorService::GetInstance()->Shutdown();
 890   }
 891   {
 892     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:BatteryStatusService");
 893     BatteryStatusService::GetInstance()->Shutdown();
 894   }
 895   {
 896     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:DeleteDataSources");
 897     URLDataManager::DeleteDataSources();
 898   }
 899 #endif  // !defined(OS_IOS)
 900
 901   if (parts_) {
 902     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:PostDestroyThreads");
 903     parts_->PostDestroyThreads();
 904   }
 905 }
 906
 907 void BrowserMainLoop::StopStartupTracingTimer() {
 908   startup_trace_timer_.Stop();
 909 }
 910
 911 void BrowserMainLoop::InitializeMainThread() {
 912   TRACE_EVENT0("startup", "BrowserMainLoop::InitializeMainThread");
 913   const char* kThreadName = "CrBrowserMain";
 914   base::PlatformThread::SetName(kThreadName);
 915   if (main_message_loop_)
 916     main_message_loop_->set_thread_name(kThreadName);
 917
 918   // Register the main thread by instantiating it, but don't call any methods.
 919   main_thread_.reset(
 920       new BrowserThreadImpl(BrowserThread::UI, base::MessageLoop::current()));
 921 }
 922
 923 int BrowserMainLoop::BrowserThreadsStarted() {
 924   TRACE_EVENT0("startup", "BrowserMainLoop::BrowserThreadsStarted");
 925
 926 #if !defined(OS_IOS)
 927   indexed_db_thread_.reset(new base::Thread("IndexedDB"));
 928   indexed_db_thread_->Start();
 929 #endif
 930
 931 #if defined(OS_ANDROID)
 932   // Up the priority of anything that touches with display tasks
 933   // (this thread is UI thread, and io_thread_ is for IPCs).
 934   io_thread_->SetPriority(base::kThreadPriority_Display);
 935   base::PlatformThread::SetThreadPriority(
 936       base::PlatformThread::CurrentHandle(),
 937       base::kThreadPriority_Display);
 938 #endif
 939
 940 #if !defined(OS_IOS)
 941   HistogramSynchronizer::GetInstance();
 942
 943   bool initialize_gpu_data_manager = true;
 944 #if defined(OS_ANDROID)
 945   // On Android, GLSurface::InitializeOneOff() must be called before initalizing
 946   // the GpuDataManagerImpl as it uses the GL bindings. crbug.com/326295
 947   if (!gfx::GLSurface::InitializeOneOff()) {
 948     LOG(ERROR) << "GLSurface::InitializeOneOff failed";
 949     initialize_gpu_data_manager = false;
 950   }
 951 #endif
 952
 953   // Initialize the GpuDataManager before we set up the MessageLoops because
 954   // otherwise we'll trigger the assertion about doing IO on the UI thread.
 955   if (initialize_gpu_data_manager)
 956     GpuDataManagerImpl::GetInstance()->Initialize();
 957
 958   bool always_uses_gpu = true;
 959   bool established_gpu_channel = false;
 960 #if defined(USE_AURA) || defined(OS_MACOSX)
 961   if (ShouldInitializeBrowserGpuChannelAndTransportSurface()) {
 962     established_gpu_channel = true;
 963     if (!GpuDataManagerImpl::GetInstance()->CanUseGpuBrowserCompositor()) {
 964       established_gpu_channel = always_uses_gpu = false;
 965     }
 966     BrowserGpuChannelHostFactory::Initialize(established_gpu_channel);
 967     ImageTransportFactory::Initialize();
 968 #if defined(USE_AURA)
 969     if (aura::Env::GetInstance()) {
 970       aura::Env::GetInstance()->set_context_factory(
 971           content::GetContextFactory());
 972     }
 973 #endif
 974   }
 975 #elif defined(OS_ANDROID)
 976   established_gpu_channel = true;
 977   BrowserGpuChannelHostFactory::Initialize(established_gpu_channel);
 978 #endif
 979
 980 #if defined(OS_LINUX) && defined(USE_UDEV)
 981   device_monitor_linux_.reset(new DeviceMonitorLinux());
 982 #elif defined(OS_MACOSX)
 983   device_monitor_mac_.reset(new DeviceMonitorMac());
 984 #endif
 985
 986   // RDH needs the IO thread to be created
 987   {
 988     TRACE_EVENT0("startup",
 989       "BrowserMainLoop::BrowserThreadsStarted:InitResourceDispatcherHost");
 990     resource_dispatcher_host_.reset(new ResourceDispatcherHostImpl());
 991   }
 992
 993   // MediaStreamManager needs the IO thread to be created.
 994   {
 995     TRACE_EVENT0("startup",
 996       "BrowserMainLoop::BrowserThreadsStarted:InitMediaStreamManager");
 997     media_stream_manager_.reset(new MediaStreamManager(audio_manager_.get()));
 998   }
 999
1000   {
1001     TRACE_EVENT0("startup",
1002       "BrowserMainLoop::BrowserThreadsStarted:InitSpeechRecognition");
1003     speech_recognition_manager_.reset(new SpeechRecognitionManagerImpl(
1004         audio_manager_.get(), media_stream_manager_.get()));
1005   }
1006
1007   {
1008     TRACE_EVENT0(
1009         "startup",
1010         "BrowserMainLoop::BrowserThreadsStarted::InitUserInputMonitor");
1011     user_input_monitor_ = media::UserInputMonitor::Create(
1012         io_thread_->message_loop_proxy(), main_thread_->message_loop_proxy());
1013   }
1014
1015   {
1016     TRACE_EVENT0("startup",
1017                  "BrowserMainLoop::BrowserThreadsStarted::TimeZoneMonitor");
1018     time_zone_monitor_ = TimeZoneMonitor::Create();
1019   }
1020
1021   // Alert the clipboard class to which threads are allowed to access the
1022   // clipboard:
1023   std::vector<base::PlatformThreadId> allowed_clipboard_threads;
1024   // The current thread is the UI thread.
1025   allowed_clipboard_threads.push_back(base::PlatformThread::CurrentId());
1026 #if defined(OS_WIN)
1027   // On Windows, clipboards are also used on the File or IO threads.
1028   allowed_clipboard_threads.push_back(file_thread_->thread_id());
1029   allowed_clipboard_threads.push_back(io_thread_->thread_id());
1030 #endif
1031   ui::Clipboard::SetAllowedThreads(allowed_clipboard_threads);
1032
1033   // When running the GPU thread in-process, avoid optimistically starting it
1034   // since creating the GPU thread races against creation of the one-and-only
1035   // ChildProcess instance which is created by the renderer thread.
1036   if (GpuDataManagerImpl::GetInstance()->GpuAccessAllowed(NULL) &&
1037       !established_gpu_channel &&
1038       always_uses_gpu &&
1039       !parsed_command_line_.HasSwitch(switches::kSingleProcess) &&
1040       !parsed_command_line_.HasSwitch(switches::kInProcessGPU)) {
1041     TRACE_EVENT_INSTANT0("gpu", "Post task to launch GPU process",
1042                          TRACE_EVENT_SCOPE_THREAD);
1043     BrowserThread::PostTask(
1044         BrowserThread::IO, FROM_HERE, base::Bind(
1045             base::IgnoreResult(&GpuProcessHost::Get),
1046             GpuProcessHost::GPU_PROCESS_KIND_SANDBOXED,
1047             CAUSE_FOR_GPU_LAUNCH_BROWSER_STARTUP));
1048   }
1049
1050 #if defined(OS_MACOSX)
1051   ThemeHelperMac::GetInstance();
1052   SystemHotkeyHelperMac::GetInstance()->DeferredLoadSystemHotkeys();
1053   if (ShouldEnableBootstrapSandbox()) {
1054     TRACE_EVENT0("startup",
1055         "BrowserMainLoop::BrowserThreadsStarted:BootstrapSandbox");
1056     CHECK(GetBootstrapSandbox());
1057   }
1058 #endif  // defined(OS_MACOSX)
1059
1060 #endif  // !defined(OS_IOS)
1061
1062   return result_code_;
1063 }
1064
1065 bool BrowserMainLoop::InitializeToolkit() {
1066   TRACE_EVENT0("startup", "BrowserMainLoop::InitializeToolkit");
1067   // TODO(evan): this function is rather subtle, due to the variety
1068   // of intersecting ifdefs we have.  To keep it easy to follow, there
1069   // are no #else branches on any #ifs.
1070   // TODO(stevenjb): Move platform specific code into platform specific Parts
1071   // (Need to add InitializeToolkit stage to BrowserParts).
1072   // See also GTK setup in EarlyInitialization, above, and associated comments.
1073
1074 #if defined(OS_WIN)
1075   // Init common control sex.
1076   INITCOMMONCONTROLSEX config;
1077   config.dwSize = sizeof(config);
1078   config.dwICC = ICC_WIN95_CLASSES;
1079   if (!InitCommonControlsEx(&config))
1080     PLOG(FATAL);
1081 #endif
1082
1083 #if defined(USE_AURA)
1084
1085 #if defined(USE_X11)
1086   if (!gfx::GetXDisplay())
1087     return false;
1088 #endif
1089
1090   // Env creates the compositor. Aura widgets need the compositor to be created
1091   // before they can be initialized by the browser.
1092   aura::Env::CreateInstance(true);
1093 #endif  // defined(USE_AURA)
1094
1095   if (parts_)
1096     parts_->ToolkitInitialized();
1097
1098   return true;
1099 }
1100
1101 void BrowserMainLoop::MainMessageLoopRun() {
1102 #if defined(OS_ANDROID)
1103   // Android's main message loop is the Java message loop.
1104   NOTREACHED();
1105 #else
1106   DCHECK(base::MessageLoopForUI::IsCurrent());
1107   if (parameters_.ui_task)
1108     base::MessageLoopForUI::current()->PostTask(FROM_HERE,
1109                                                 *parameters_.ui_task);
1110
1111   base::RunLoop run_loop;
1112   run_loop.Run();
1113 #endif
1114 }
1115
1116 base::FilePath BrowserMainLoop::GetStartupTraceFileName(
1117     const base::CommandLine& command_line) const {
1118   base::FilePath trace_file = command_line.GetSwitchValuePath(
1119       switches::kTraceStartupFile);
1120   // trace_file = "none" means that startup events will show up for the next
1121   // begin/end tracing (via about:tracing or AutomationProxy::BeginTracing/
1122   // EndTracing, for example).
1123   if (trace_file == base::FilePath().AppendASCII("none"))
1124     return trace_file;
1125
1126   if (trace_file.empty()) {
1127 #if defined(OS_ANDROID)
1128     TracingControllerAndroid::GenerateTracingFilePath(&trace_file);
1129 #else
1130     // Default to saving the startup trace into the current dir.
1131     trace_file = base::FilePath().AppendASCII("chrometrace.log");
1132 #endif
1133   }
1134
1135   return trace_file;
1136 }
1137
1138 void BrowserMainLoop::InitStartupTracing(
1139     const base::CommandLine& command_line) {
1140   DCHECK(is_tracing_startup_);
1141
1142   startup_trace_file_ = GetStartupTraceFileName(parsed_command_line_);
1143
1144   std::string delay_str = command_line.GetSwitchValueASCII(
1145       switches::kTraceStartupDuration);
1146   int delay_secs = 5;
1147   if (!delay_str.empty() && !base::StringToInt(delay_str, &delay_secs)) {
1148     DLOG(WARNING) << "Could not parse --" << switches::kTraceStartupDuration
1149         << "=" << delay_str << " defaulting to 5 (secs)";
1150     delay_secs = 5;
1151   }
1152
1153   startup_trace_timer_.Start(FROM_HERE,
1154                              base::TimeDelta::FromSeconds(delay_secs),
1155                              this,
1156                              &BrowserMainLoop::EndStartupTracing);
1157 }
1158
1159 void BrowserMainLoop::EndStartupTracing() {
1160   is_tracing_startup_ = false;
1161   TracingController::GetInstance()->DisableRecording(
1162       startup_trace_file_, base::Bind(&OnStoppedStartupTracing));
1163 }
1164
1165 }  // namespace content