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/logging.h"
  11 #include "base/message_loop/message_loop.h"
  12 #include "base/metrics/field_trial.h"
  13 #include "base/metrics/histogram.h"
  14 #include "base/path_service.h"
  15 #include "base/pending_task.h"
  16 #include "base/power_monitor/power_monitor.h"
  17 #include "base/power_monitor/power_monitor_device_source.h"
  18 #include "base/process/process_metrics.h"
  19 #include "base/run_loop.h"
  20 #include "base/strings/string_number_conversions.h"
  21 #include "base/system_monitor/system_monitor.h"
  22 #include "base/thread_task_runner_handle.h"
  23 #include "base/threading/thread_restrictions.h"
  24 #include "base/timer/hi_res_timer_manager.h"
  25 #include "content/browser/battery_status/battery_status_service.h"
  26 #include "content/browser/browser_thread_impl.h"
  27 #include "content/browser/device_sensors/device_inertial_sensor_service.h"
  28 #include "content/browser/download/save_file_manager.h"
  29 #include "content/browser/gamepad/gamepad_service.h"
  30 #include "content/browser/gpu/browser_gpu_channel_host_factory.h"
  31 #include "content/browser/gpu/compositor_util.h"
  32 #include "content/browser/gpu/gpu_data_manager_impl.h"
  33 #include "content/browser/gpu/gpu_process_host.h"
  34 #include "content/browser/gpu/gpu_process_host_ui_shim.h"
  35 #include "content/browser/histogram_synchronizer.h"
  36 #include "content/browser/loader/resource_dispatcher_host_impl.h"
  37 #include "content/browser/media/media_internals.h"
  38 #include "content/browser/net/browser_online_state_observer.h"
  39 #include "content/browser/renderer_host/media/media_stream_manager.h"
  40 #include "content/browser/speech/speech_recognition_manager_impl.h"
  41 #include "content/browser/startup_task_runner.h"
  42 #include "content/browser/time_zone_monitor.h"
  43 #include "content/browser/webui/content_web_ui_controller_factory.h"
  44 #include "content/browser/webui/url_data_manager.h"
  45 #include "content/public/browser/browser_main_parts.h"
  46 #include "content/public/browser/browser_shutdown.h"
  47 #include "content/public/browser/content_browser_client.h"
  48 #include "content/public/browser/render_process_host.h"
  49 #include "content/public/browser/tracing_controller.h"
  50 #include "content/public/common/content_switches.h"
  51 #include "content/public/common/main_function_params.h"
  52 #include "content/public/common/result_codes.h"
  53 #include "crypto/nss_util.h"
  54 #include "media/audio/audio_manager.h"
  55 #include "media/base/media.h"
  56 #include "media/base/user_input_monitor.h"
  57 #include "media/midi/midi_manager.h"
  58 #include "net/base/network_change_notifier.h"
  59 #include "net/socket/client_socket_factory.h"
  60 #include "net/ssl/ssl_config_service.h"
  61 #include "ui/base/clipboard/clipboard.h"
  62
  63 #if defined(USE_AURA) || (defined(OS_MACOSX) && !defined(OS_IOS))
  64 #include "content/browser/compositor/image_transport_factory.h"
  65 #endif
  66
  67 #if defined(USE_AURA)
  68 #include "content/public/browser/context_factory.h"
  69 #include "ui/aura/env.h"
  70 #endif
  71
  72 #if !defined(OS_IOS)
  73 #include "content/browser/renderer_host/render_process_host_impl.h"
  74 #endif
  75
  76 #if defined(OS_ANDROID)
  77 #include "base/android/jni_android.h"
  78 #include "content/browser/android/browser_startup_controller.h"
  79 #include "content/browser/android/browser_surface_texture_manager.h"
  80 #include "content/browser/android/tracing_controller_android.h"
  81 #include "content/browser/screen_orientation/screen_orientation_delegate_android.h"
  82 #include "content/public/browser/screen_orientation_provider.h"
  83 #include "ui/gl/gl_surface.h"
  84 #endif
  85
  86 #if defined(OS_MACOSX) && !defined(OS_IOS)
  87 #include "content/browser/bootstrap_sandbox_mac.h"
  88 #include "content/browser/cocoa/system_hotkey_helper_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(ENABLE_PLUGINS)
 120 #include "content/browser/plugin_service_impl.h"
 121 #endif
 122
 123 #if defined(TCMALLOC_TRACE_MEMORY_SUPPORTED)
 124 #include "third_party/tcmalloc/chromium/src/gperftools/heap-profiler.h"
 125 #endif
 126
 127 #if defined(USE_X11)
 128 #include "ui/gfx/x/x11_connection.h"
 129 #include "ui/gfx/x/x11_types.h"
 130 #endif
 131
 132 // One of the linux specific headers defines this as a macro.
 133 #ifdef DestroyAll
 134 #undef DestroyAll
 135 #endif
 136
 137 namespace content {
 138 namespace {
 139
 140 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 141 void SetupSandbox(const base::CommandLine& parsed_command_line) {
 142   TRACE_EVENT0("startup", "SetupSandbox");
 143   base::FilePath sandbox_binary;
 144
 145   scoped_ptr<sandbox::SetuidSandboxClient> setuid_sandbox_client(
 146       sandbox::SetuidSandboxClient::Create());
 147
 148   const bool want_setuid_sandbox =
 149       !parsed_command_line.HasSwitch(switches::kNoSandbox) &&
 150       !parsed_command_line.HasSwitch(switches::kDisableSetuidSandbox) &&
 151       !setuid_sandbox_client->IsDisabledViaEnvironment();
 152
 153   static const char no_suid_error[] =
 154       "Running without the SUID sandbox! See "
 155       "https://code.google.com/p/chromium/wiki/LinuxSUIDSandboxDevelopment "
 156       "for more information on developing with the sandbox on.";
 157   if (want_setuid_sandbox) {
 158     sandbox_binary = setuid_sandbox_client->GetSandboxBinaryPath();
 159     if (sandbox_binary.empty()) {
 160       // This needs to be fatal. Talk to security@chromium.org if you feel
 161       // otherwise.
 162       LOG(FATAL) << no_suid_error;
 163     }
 164   } else {
 165     LOG(ERROR) << no_suid_error;
 166   }
 167
 168   // Tickle the sandbox host and zygote host so they fork now.
 169   RenderSandboxHostLinux::GetInstance()->Init();
 170   ZygoteHostImpl::GetInstance()->Init(sandbox_binary.value());
 171 }
 172 #endif
 173
 174 #if defined(USE_GLIB)
 175 static void GLibLogHandler(const gchar* log_domain,
 176                            GLogLevelFlags log_level,
 177                            const gchar* message,
 178                            gpointer userdata) {
 179   if (!log_domain)
 180     log_domain = "<unknown>";
 181   if (!message)
 182     message = "<no message>";
 183
 184   if (strstr(message, "Unable to retrieve the file info for")) {
 185     LOG(ERROR) << "GTK File code error: " << message;
 186   } else if (strstr(message, "Could not find the icon") &&
 187              strstr(log_domain, "Gtk")) {
 188     LOG(ERROR) << "GTK icon error: " << message;
 189   } else if (strstr(message, "Theme file for default has no") ||
 190              strstr(message, "Theme directory") ||
 191              strstr(message, "theme pixmap") ||
 192              strstr(message, "locate theme engine")) {
 193     LOG(ERROR) << "GTK theme error: " << message;
 194   } else if (strstr(message, "Unable to create Ubuntu Menu Proxy") &&
 195              strstr(log_domain, "<unknown>")) {
 196     LOG(ERROR) << "GTK menu proxy create failed";
 197   } else if (strstr(message, "Out of memory") &&
 198              strstr(log_domain, "<unknown>")) {
 199     LOG(ERROR) << "DBus call timeout or out of memory: "
 200                << "http://crosbug.com/15496";
 201   } else if (strstr(message, "Could not connect: Connection refused") &&
 202              strstr(log_domain, "<unknown>")) {
 203     LOG(ERROR) << "DConf settings backend could not connect to session bus: "
 204                << "http://crbug.com/179797";
 205   } else if (strstr(message, "Attempting to store changes into") ||
 206              strstr(message, "Attempting to set the permissions of")) {
 207     LOG(ERROR) << message << " (http://bugs.chromium.org/161366)";
 208   } else if (strstr(message, "drawable is not a native X11 window")) {
 209     LOG(ERROR) << message << " (http://bugs.chromium.org/329991)";
 210   } else {
 211     LOG(DFATAL) << log_domain << ": " << message;
 212   }
 213 }
 214
 215 static void SetUpGLibLogHandler() {
 216   // Register GLib-handled assertions to go through our logging system.
 217   const char* kLogDomains[] = { NULL, "Gtk", "Gdk", "GLib", "GLib-GObject" };
 218   for (size_t i = 0; i < arraysize(kLogDomains); i++) {
 219     g_log_set_handler(kLogDomains[i],
 220                       static_cast<GLogLevelFlags>(G_LOG_FLAG_RECURSION |
 221                                                   G_LOG_FLAG_FATAL |
 222                                                   G_LOG_LEVEL_ERROR |
 223                                                   G_LOG_LEVEL_CRITICAL |
 224                                                   G_LOG_LEVEL_WARNING),
 225                       GLibLogHandler,
 226                       NULL);
 227   }
 228 }
 229 #endif
 230
 231 void OnStoppedStartupTracing(const base::FilePath& trace_file) {
 232   VLOG(0) << "Completed startup tracing to " << trace_file.value();
 233 }
 234
 235 #if defined(USE_AURA)
 236 bool ShouldInitializeBrowserGpuChannelAndTransportSurface() {
 237   return true;
 238 }
 239 #elif defined(OS_MACOSX) && !defined(OS_IOS)
 240 bool ShouldInitializeBrowserGpuChannelAndTransportSurface() {
 241   return IsDelegatedRendererEnabled();
 242 }
 243 #endif
 244
 245 // Disable optimizations for this block of functions so the compiler doesn't
 246 // merge them all together. This makes it possible to tell what thread was
 247 // unresponsive by inspecting the callstack.
 248 MSVC_DISABLE_OPTIMIZE()
 249 MSVC_PUSH_DISABLE_WARNING(4748)
 250
 251 NOINLINE void ResetThread_DB(scoped_ptr<BrowserProcessSubThread> thread) {
 252   thread.reset();
 253 }
 254
 255 NOINLINE void ResetThread_FILE(scoped_ptr<BrowserProcessSubThread> thread) {
 256   thread.reset();
 257 }
 258
 259 NOINLINE void ResetThread_FILE_USER_BLOCKING(
 260     scoped_ptr<BrowserProcessSubThread> thread) {
 261   thread.reset();
 262 }
 263
 264 NOINLINE void ResetThread_PROCESS_LAUNCHER(
 265     scoped_ptr<BrowserProcessSubThread> thread) {
 266   thread.reset();
 267 }
 268
 269 NOINLINE void ResetThread_CACHE(scoped_ptr<BrowserProcessSubThread> thread) {
 270   thread.reset();
 271 }
 272
 273 NOINLINE void ResetThread_IO(scoped_ptr<BrowserProcessSubThread> thread) {
 274   thread.reset();
 275 }
 276
 277 #if !defined(OS_IOS)
 278 NOINLINE void ResetThread_IndexedDb(scoped_ptr<base::Thread> thread) {
 279   thread.reset();
 280 }
 281 #endif
 282
 283 MSVC_POP_WARNING()
 284 MSVC_ENABLE_OPTIMIZE();
 285
 286 }  // namespace
 287
 288 // The currently-running BrowserMainLoop.  There can be one or zero.
 289 BrowserMainLoop* g_current_browser_main_loop = NULL;
 290
 291 // This is just to be able to keep ShutdownThreadsAndCleanUp out of
 292 // the public interface of BrowserMainLoop.
 293 class BrowserShutdownImpl {
 294  public:
 295   static void ImmediateShutdownAndExitProcess() {
 296     DCHECK(g_current_browser_main_loop);
 297     g_current_browser_main_loop->ShutdownThreadsAndCleanUp();
 298
 299 #if defined(OS_WIN)
 300     // At this point the message loop is still running yet we've shut everything
 301     // down. If any messages are processed we'll likely crash. Exit now.
 302     ExitProcess(RESULT_CODE_NORMAL_EXIT);
 303 #elif defined(OS_POSIX) && !defined(OS_MACOSX)
 304     _exit(RESULT_CODE_NORMAL_EXIT);
 305 #else
 306     NOTIMPLEMENTED();
 307 #endif
 308   }
 309 };
 310
 311 void ImmediateShutdownAndExitProcess() {
 312   BrowserShutdownImpl::ImmediateShutdownAndExitProcess();
 313 }
 314
 315 // For measuring memory usage after each task. Behind a command line flag.
 316 class BrowserMainLoop::MemoryObserver : public base::MessageLoop::TaskObserver {
 317  public:
 318   MemoryObserver() {}
 319   ~MemoryObserver() override {}
 320
 321   void WillProcessTask(const base::PendingTask& pending_task) override {}
 322
 323   void DidProcessTask(const base::PendingTask& pending_task) override {
 324 #if !defined(OS_IOS)  // No ProcessMetrics on IOS.
 325     scoped_ptr<base::ProcessMetrics> process_metrics(
 326         base::ProcessMetrics::CreateProcessMetrics(
 327 #if defined(OS_MACOSX)
 328             base::GetCurrentProcessHandle(), NULL));
 329 #else
 330             base::GetCurrentProcessHandle()));
 331 #endif
 332     size_t private_bytes;
 333     process_metrics->GetMemoryBytes(&private_bytes, NULL);
 334     LOCAL_HISTOGRAM_MEMORY_KB("Memory.BrowserUsed", private_bytes >> 10);
 335 #endif
 336   }
 337  private:
 338   DISALLOW_COPY_AND_ASSIGN(MemoryObserver);
 339 };
 340
 341
 342 // BrowserMainLoop construction / destruction =============================
 343
 344 BrowserMainLoop* BrowserMainLoop::GetInstance() {
 345   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 346   return g_current_browser_main_loop;
 347 }
 348
 349 BrowserMainLoop::BrowserMainLoop(const MainFunctionParams& parameters)
 350     : parameters_(parameters),
 351       parsed_command_line_(parameters.command_line),
 352       result_code_(RESULT_CODE_NORMAL_EXIT),
 353       created_threads_(false),
 354       // ContentMainRunner should have enabled tracing of the browser process
 355       // when kTraceStartup is in the command line.
 356       is_tracing_startup_(
 357           parameters.command_line.HasSwitch(switches::kTraceStartup)) {
 358   DCHECK(!g_current_browser_main_loop);
 359   g_current_browser_main_loop = this;
 360 }
 361
 362 BrowserMainLoop::~BrowserMainLoop() {
 363   DCHECK_EQ(this, g_current_browser_main_loop);
 364 #if !defined(OS_IOS)
 365   ui::Clipboard::DestroyClipboardForCurrentThread();
 366 #endif  // !defined(OS_IOS)
 367   g_current_browser_main_loop = NULL;
 368 }
 369
 370 void BrowserMainLoop::Init() {
 371   TRACE_EVENT0("startup", "BrowserMainLoop::Init");
 372   parts_.reset(
 373       GetContentClient()->browser()->CreateBrowserMainParts(parameters_));
 374 }
 375
 376 // BrowserMainLoop stages ==================================================
 377
 378 void BrowserMainLoop::EarlyInitialization() {
 379   TRACE_EVENT0("startup", "BrowserMainLoop::EarlyInitialization");
 380
 381 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 382   // No thread should be created before this call, as SetupSandbox()
 383   // will end-up using fork().
 384   SetupSandbox(parsed_command_line_);
 385 #endif
 386
 387 #if defined(USE_X11)
 388   if (parsed_command_line_.HasSwitch(switches::kSingleProcess) ||
 389       parsed_command_line_.HasSwitch(switches::kInProcessGPU)) {
 390     if (!gfx::InitializeThreadedX11()) {
 391       LOG(ERROR) << "Failed to put Xlib into threaded mode.";
 392     }
 393   }
 394 #endif
 395
 396   // GLib's spawning of new processes is buggy, so it's important that at this
 397   // point GLib does not need to start DBUS. Chrome should always start with
 398   // DBUS_SESSION_BUS_ADDRESS properly set. See crbug.com/309093.
 399 #if defined(USE_GLIB)
 400   // g_type_init will be deprecated in 2.36. 2.35 is the development
 401   // version for 2.36, hence do not call g_type_init starting 2.35.
 402   // http://developer.gnome.org/gobject/unstable/gobject-Type-Information.html#g-type-init
 403 #if !GLIB_CHECK_VERSION(2, 35, 0)
 404   // GLib type system initialization. Needed at least for gconf,
 405   // used in net/proxy/proxy_config_service_linux.cc. Most likely
 406   // this is superfluous as gtk_init() ought to do this. It's
 407   // definitely harmless, so retained as a reminder of this
 408   // requirement for gconf.
 409   g_type_init();
 410 #endif
 411
 412   SetUpGLibLogHandler();
 413 #endif
 414
 415   if (parts_)
 416     parts_->PreEarlyInitialization();
 417
 418 #if defined(OS_MACOSX)
 419   // We use quite a few file descriptors for our IPC, and the default limit on
 420   // the Mac is low (256), so bump it up.
 421   base::SetFdLimit(1024);
 422 #endif
 423
 424 #if defined(OS_WIN)
 425   net::EnsureWinsockInit();
 426 #endif
 427
 428 #if !defined(USE_OPENSSL)
 429   // We want to be sure to init NSPR on the main thread.
 430   crypto::EnsureNSPRInit();
 431 #endif  // !defined(USE_OPENSSL)
 432
 433 #if !defined(OS_IOS)
 434   if (parsed_command_line_.HasSwitch(switches::kRendererProcessLimit)) {
 435     std::string limit_string = parsed_command_line_.GetSwitchValueASCII(
 436         switches::kRendererProcessLimit);
 437     size_t process_limit;
 438     if (base::StringToSizeT(limit_string, &process_limit)) {
 439       RenderProcessHost::SetMaxRendererProcessCount(process_limit);
 440     }
 441   }
 442 #endif  // !defined(OS_IOS)
 443
 444   if (parts_)
 445     parts_->PostEarlyInitialization();
 446 }
 447
 448 void BrowserMainLoop::MainMessageLoopStart() {
 449   TRACE_EVENT0("startup", "BrowserMainLoop::MainMessageLoopStart");
 450   if (parts_) {
 451     TRACE_EVENT0("startup",
 452         "BrowserMainLoop::MainMessageLoopStart:PreMainMessageLoopStart");
 453     parts_->PreMainMessageLoopStart();
 454   }
 455
 456 #if defined(OS_WIN)
 457   // If we're running tests (ui_task is non-null), then the ResourceBundle
 458   // has already been initialized.
 459   if (!parameters_.ui_task) {
 460     // Override the configured locale with the user's preferred UI language.
 461     l10n_util::OverrideLocaleWithUILanguageList();
 462   }
 463 #endif
 464
 465   // Create a MessageLoop if one does not already exist for the current thread.
 466   if (!base::MessageLoop::current())
 467     main_message_loop_.reset(new base::MessageLoopForUI);
 468
 469   InitializeMainThread();
 470
 471   {
 472     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:SystemMonitor");
 473     system_monitor_.reset(new base::SystemMonitor);
 474   }
 475   {
 476     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:PowerMonitor");
 477     scoped_ptr<base::PowerMonitorSource> power_monitor_source(
 478       new base::PowerMonitorDeviceSource());
 479     power_monitor_.reset(new base::PowerMonitor(power_monitor_source.Pass()));
 480   }
 481   {
 482     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:HighResTimerManager");
 483     hi_res_timer_manager_.reset(new base::HighResolutionTimerManager);
 484   }
 485   {
 486     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:NetworkChangeNotifier");
 487     network_change_notifier_.reset(net::NetworkChangeNotifier::Create());
 488   }
 489
 490 #if !defined(OS_IOS)
 491   {
 492     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:MediaFeatures");
 493     media::InitializeCPUSpecificMediaFeatures();
 494   }
 495   {
 496     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:AudioMan");
 497     audio_manager_.reset(media::AudioManager::Create(
 498         MediaInternals::GetInstance()));
 499   }
 500   {
 501     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:MidiManager");
 502     midi_manager_.reset(media::MidiManager::Create());
 503   }
 504   {
 505     TRACE_EVENT0("startup",
 506                  "BrowserMainLoop::Subsystem:ContentWebUIController");
 507     WebUIControllerFactory::RegisterFactory(
 508         ContentWebUIControllerFactory::GetInstance());
 509   }
 510
 511   {
 512     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:OnlineStateObserver");
 513     online_state_observer_.reset(new BrowserOnlineStateObserver);
 514   }
 515
 516   {
 517     system_stats_monitor_.reset(new base::debug::TraceEventSystemStatsMonitor(
 518         base::ThreadTaskRunnerHandle::Get()));
 519   }
 520 #endif  // !defined(OS_IOS)
 521
 522 #if defined(OS_WIN)
 523   system_message_window_.reset(new SystemMessageWindowWin);
 524 #endif
 525
 526   if (parts_)
 527     parts_->PostMainMessageLoopStart();
 528
 529 #if !defined(OS_IOS)
 530   // Start tracing to a file if needed. Only do this after starting the main
 531   // message loop to avoid calling MessagePumpForUI::ScheduleWork() before
 532   // MessagePumpForUI::Start() as it will crash the browser.
 533   if (is_tracing_startup_) {
 534     TRACE_EVENT0("startup", "BrowserMainLoop::InitStartupTracing");
 535     InitStartupTracing(parsed_command_line_);
 536   }
 537 #endif  // !defined(OS_IOS)
 538
 539 #if defined(OS_ANDROID)
 540   {
 541     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:SurfaceTextureManager");
 542     SurfaceTextureManager::InitInstance(new BrowserSurfaceTextureManager);
 543   }
 544
 545   {
 546     TRACE_EVENT0("startup",
 547                  "BrowserMainLoop::Subsystem:ScreenOrientationProvider");
 548     screen_orientation_delegate_.reset(
 549         new ScreenOrientationDelegateAndroid());
 550     ScreenOrientationProvider::SetDelegate(screen_orientation_delegate_.get());
 551   }
 552 #endif
 553
 554   if (parsed_command_line_.HasSwitch(switches::kMemoryMetrics)) {
 555     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:MemoryObserver");
 556     memory_observer_.reset(new MemoryObserver());
 557     base::MessageLoop::current()->AddTaskObserver(memory_observer_.get());
 558   }
 559
 560 #if defined(TCMALLOC_TRACE_MEMORY_SUPPORTED)
 561   trace_memory_controller_.reset(new base::debug::TraceMemoryController(
 562       base::MessageLoop::current()->message_loop_proxy(),
 563       ::HeapProfilerWithPseudoStackStart,
 564       ::HeapProfilerStop,
 565       ::GetHeapProfile));
 566 #endif
 567 }
 568
 569 int BrowserMainLoop::PreCreateThreads() {
 570   if (parts_) {
 571     TRACE_EVENT0("startup",
 572         "BrowserMainLoop::CreateThreads:PreCreateThreads");
 573     result_code_ = parts_->PreCreateThreads();
 574   }
 575
 576 #if defined(ENABLE_PLUGINS)
 577   // Prior to any processing happening on the io thread, we create the
 578   // plugin service as it is predominantly used from the io thread,
 579   // but must be created on the main thread. The service ctor is
 580   // inexpensive and does not invoke the io_thread() accessor.
 581   {
 582     TRACE_EVENT0("startup", "BrowserMainLoop::CreateThreads:PluginService");
 583     PluginService::GetInstance()->Init();
 584   }
 585 #endif
 586
 587 #if !defined(OS_IOS) && (!defined(GOOGLE_CHROME_BUILD) || defined(OS_ANDROID))
 588   // Single-process is an unsupported and not fully tested mode, so
 589   // don't enable it for official Chrome builds (except on Android).
 590   if (parsed_command_line_.HasSwitch(switches::kSingleProcess))
 591     RenderProcessHost::SetRunRendererInProcess(true);
 592 #endif
 593   return result_code_;
 594 }
 595
 596 void BrowserMainLoop::CreateStartupTasks() {
 597   TRACE_EVENT0("startup", "BrowserMainLoop::CreateStartupTasks");
 598
 599   // First time through, we really want to create all the tasks
 600   if (!startup_task_runner_.get()) {
 601 #if defined(OS_ANDROID)
 602     startup_task_runner_ = make_scoped_ptr(new StartupTaskRunner(
 603         base::Bind(&BrowserStartupComplete),
 604         base::MessageLoop::current()->message_loop_proxy()));
 605 #else
 606     startup_task_runner_ = make_scoped_ptr(new StartupTaskRunner(
 607         base::Callback<void(int)>(),
 608         base::MessageLoop::current()->message_loop_proxy()));
 609 #endif
 610     StartupTask pre_create_threads =
 611         base::Bind(&BrowserMainLoop::PreCreateThreads, base::Unretained(this));
 612     startup_task_runner_->AddTask(pre_create_threads);
 613
 614     StartupTask create_threads =
 615         base::Bind(&BrowserMainLoop::CreateThreads, base::Unretained(this));
 616     startup_task_runner_->AddTask(create_threads);
 617
 618     StartupTask browser_thread_started = base::Bind(
 619         &BrowserMainLoop::BrowserThreadsStarted, base::Unretained(this));
 620     startup_task_runner_->AddTask(browser_thread_started);
 621
 622     StartupTask pre_main_message_loop_run = base::Bind(
 623         &BrowserMainLoop::PreMainMessageLoopRun, base::Unretained(this));
 624     startup_task_runner_->AddTask(pre_main_message_loop_run);
 625
 626 #if defined(OS_ANDROID)
 627     if (BrowserMayStartAsynchronously()) {
 628       startup_task_runner_->StartRunningTasksAsync();
 629     }
 630 #endif
 631   }
 632 #if defined(OS_ANDROID)
 633   if (!BrowserMayStartAsynchronously()) {
 634     // A second request for asynchronous startup can be ignored, so
 635     // StartupRunningTasksAsync is only called first time through. If, however,
 636     // this is a request for synchronous startup then it must override any
 637     // previous call for async startup, so we call RunAllTasksNow()
 638     // unconditionally.
 639     startup_task_runner_->RunAllTasksNow();
 640   }
 641 #else
 642   startup_task_runner_->RunAllTasksNow();
 643 #endif
 644 }
 645
 646 int BrowserMainLoop::CreateThreads() {
 647   TRACE_EVENT0("startup", "BrowserMainLoop::CreateThreads");
 648
 649   base::Thread::Options io_message_loop_options;
 650   io_message_loop_options.message_loop_type = base::MessageLoop::TYPE_IO;
 651   base::Thread::Options ui_message_loop_options;
 652   ui_message_loop_options.message_loop_type = base::MessageLoop::TYPE_UI;
 653
 654   // Start threads in the order they occur in the BrowserThread::ID
 655   // enumeration, except for BrowserThread::UI which is the main
 656   // thread.
 657   //
 658   // Must be size_t so we can increment it.
 659   for (size_t thread_id = BrowserThread::UI + 1;
 660        thread_id < BrowserThread::ID_COUNT;
 661        ++thread_id) {
 662     scoped_ptr<BrowserProcessSubThread>* thread_to_start = NULL;
 663     base::Thread::Options options;
 664
 665     switch (thread_id) {
 666       case BrowserThread::DB:
 667         TRACE_EVENT_BEGIN1("startup",
 668             "BrowserMainLoop::CreateThreads:start",
 669             "Thread", "BrowserThread::DB");
 670         thread_to_start = &db_thread_;
 671         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 672         break;
 673       case BrowserThread::FILE_USER_BLOCKING:
 674         TRACE_EVENT_BEGIN1("startup",
 675             "BrowserMainLoop::CreateThreads:start",
 676             "Thread", "BrowserThread::FILE_USER_BLOCKING");
 677         thread_to_start = &file_user_blocking_thread_;
 678         break;
 679       case BrowserThread::FILE:
 680         TRACE_EVENT_BEGIN1("startup",
 681             "BrowserMainLoop::CreateThreads:start",
 682             "Thread", "BrowserThread::FILE");
 683         thread_to_start = &file_thread_;
 684 #if defined(OS_WIN)
 685         // On Windows, the FILE thread needs to be have a UI message loop
 686         // which pumps messages in such a way that Google Update can
 687         // communicate back to us.
 688         options = ui_message_loop_options;
 689 #else
 690         options = io_message_loop_options;
 691 #endif
 692         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 693         break;
 694       case BrowserThread::PROCESS_LAUNCHER:
 695         TRACE_EVENT_BEGIN1("startup",
 696             "BrowserMainLoop::CreateThreads:start",
 697             "Thread", "BrowserThread::PROCESS_LAUNCHER");
 698         thread_to_start = &process_launcher_thread_;
 699         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 700         break;
 701       case BrowserThread::CACHE:
 702         TRACE_EVENT_BEGIN1("startup",
 703             "BrowserMainLoop::CreateThreads:start",
 704             "Thread", "BrowserThread::CACHE");
 705         thread_to_start = &cache_thread_;
 706         options = io_message_loop_options;
 707         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 708         break;
 709       case BrowserThread::IO:
 710         TRACE_EVENT_BEGIN1("startup",
 711             "BrowserMainLoop::CreateThreads:start",
 712             "Thread", "BrowserThread::IO");
 713         thread_to_start = &io_thread_;
 714         options = io_message_loop_options;
 715         break;
 716       case BrowserThread::UI:
 717       case BrowserThread::ID_COUNT:
 718       default:
 719         NOTREACHED();
 720         break;
 721     }
 722
 723     BrowserThread::ID id = static_cast<BrowserThread::ID>(thread_id);
 724
 725     if (thread_to_start) {
 726       (*thread_to_start).reset(new BrowserProcessSubThread(id));
 727       if (!(*thread_to_start)->StartWithOptions(options)) {
 728         LOG(FATAL) << "Failed to start the browser thread: id == " << id;
 729       }
 730     } else {
 731       NOTREACHED();
 732     }
 733
 734     TRACE_EVENT_END0("startup", "BrowserMainLoop::CreateThreads:start");
 735   }
 736   created_threads_ = true;
 737   return result_code_;
 738 }
 739
 740 int BrowserMainLoop::PreMainMessageLoopRun() {
 741   if (parts_) {
 742     TRACE_EVENT0("startup",
 743         "BrowserMainLoop::CreateThreads:PreMainMessageLoopRun");
 744     parts_->PreMainMessageLoopRun();
 745   }
 746
 747   // If the UI thread blocks, the whole UI is unresponsive.
 748   // Do not allow disk IO from the UI thread.
 749   base::ThreadRestrictions::SetIOAllowed(false);
 750   base::ThreadRestrictions::DisallowWaiting();
 751   return result_code_;
 752 }
 753
 754 void BrowserMainLoop::RunMainMessageLoopParts() {
 755   TRACE_EVENT_BEGIN_ETW("BrowserMain:MESSAGE_LOOP", 0, "");
 756
 757   bool ran_main_loop = false;
 758   if (parts_)
 759     ran_main_loop = parts_->MainMessageLoopRun(&result_code_);
 760
 761   if (!ran_main_loop)
 762     MainMessageLoopRun();
 763
 764   TRACE_EVENT_END_ETW("BrowserMain:MESSAGE_LOOP", 0, "");
 765 }
 766
 767 void BrowserMainLoop::ShutdownThreadsAndCleanUp() {
 768   if (!created_threads_) {
 769     // Called early, nothing to do
 770     return;
 771   }
 772   TRACE_EVENT0("shutdown", "BrowserMainLoop::ShutdownThreadsAndCleanUp");
 773
 774   // Teardown may start in PostMainMessageLoopRun, and during teardown we
 775   // need to be able to perform IO.
 776   base::ThreadRestrictions::SetIOAllowed(true);
 777   BrowserThread::PostTask(
 778       BrowserThread::IO, FROM_HERE,
 779       base::Bind(base::IgnoreResult(&base::ThreadRestrictions::SetIOAllowed),
 780                  true));
 781
 782 #if !defined(OS_IOS)
 783   if (RenderProcessHost::run_renderer_in_process())
 784     RenderProcessHostImpl::ShutDownInProcessRenderer();
 785 #endif
 786
 787   if (parts_) {
 788     TRACE_EVENT0("shutdown",
 789                  "BrowserMainLoop::Subsystem:PostMainMessageLoopRun");
 790     parts_->PostMainMessageLoopRun();
 791   }
 792
 793   trace_memory_controller_.reset();
 794   system_stats_monitor_.reset();
 795
 796 #if !defined(OS_IOS)
 797   // Destroying the GpuProcessHostUIShims on the UI thread posts a task to
 798   // delete related objects on the GPU thread. This must be done before
 799   // stopping the GPU thread. The GPU thread will close IPC channels to renderer
 800   // processes so this has to happen before stopping the IO thread.
 801   {
 802     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:GPUProcessHostShim");
 803     GpuProcessHostUIShim::DestroyAll();
 804   }
 805   // Cancel pending requests and prevent new requests.
 806   if (resource_dispatcher_host_) {
 807     TRACE_EVENT0("shutdown",
 808                  "BrowserMainLoop::Subsystem:ResourceDispatcherHost");
 809     resource_dispatcher_host_.get()->Shutdown();
 810   }
 811
 812 #if defined(USE_AURA) || defined(OS_MACOSX)
 813   if (ShouldInitializeBrowserGpuChannelAndTransportSurface()) {
 814     TRACE_EVENT0("shutdown",
 815                  "BrowserMainLoop::Subsystem:ImageTransportFactory");
 816     ImageTransportFactory::Terminate();
 817   }
 818 #endif
 819
 820 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 821   ZygoteHostImpl::GetInstance()->TearDownAfterLastChild();
 822 #endif  // defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 823
 824   // The device monitors are using |system_monitor_| as dependency, so delete
 825   // them before |system_monitor_| goes away.
 826   // On Mac and windows, the monitor needs to be destroyed on the same thread
 827   // as they were created. On Linux, the monitor will be deleted when IO thread
 828   // goes away.
 829 #if defined(OS_WIN)
 830   system_message_window_.reset();
 831 #elif defined(OS_MACOSX)
 832   device_monitor_mac_.reset();
 833 #endif
 834 #endif  // !defined(OS_IOS)
 835
 836   // Must be size_t so we can subtract from it.
 837   for (size_t thread_id = BrowserThread::ID_COUNT - 1;
 838        thread_id >= (BrowserThread::UI + 1);
 839        --thread_id) {
 840     // Find the thread object we want to stop. Looping over all valid
 841     // BrowserThread IDs and DCHECKing on a missing case in the switch
 842     // statement helps avoid a mismatch between this code and the
 843     // BrowserThread::ID enumeration.
 844     //
 845     // The destruction order is the reverse order of occurrence in the
 846     // BrowserThread::ID list. The rationale for the order is as
 847     // follows (need to be filled in a bit):
 848     //
 849     //
 850     // - The IO thread is the only user of the CACHE thread.
 851     //
 852     // - The PROCESS_LAUNCHER thread must be stopped after IO in case
 853     //   the IO thread posted a task to terminate a process on the
 854     //   process launcher thread.
 855     //
 856     // - (Not sure why DB stops last.)
 857     switch (thread_id) {
 858       case BrowserThread::DB: {
 859         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:DBThread");
 860         ResetThread_DB(db_thread_.Pass());
 861         break;
 862       }
 863       case BrowserThread::FILE: {
 864         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:FileThread");
 865 #if !defined(OS_IOS)
 866         // Clean up state that lives on or uses the file_thread_ before
 867         // it goes away.
 868         if (resource_dispatcher_host_)
 869           resource_dispatcher_host_.get()->save_file_manager()->Shutdown();
 870 #endif  // !defined(OS_IOS)
 871         ResetThread_FILE(file_thread_.Pass());
 872         break;
 873       }
 874       case BrowserThread::FILE_USER_BLOCKING: {
 875         TRACE_EVENT0("shutdown",
 876                       "BrowserMainLoop::Subsystem:FileUserBlockingThread");
 877         ResetThread_FILE_USER_BLOCKING(file_user_blocking_thread_.Pass());
 878         break;
 879       }
 880       case BrowserThread::PROCESS_LAUNCHER: {
 881         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:LauncherThread");
 882         ResetThread_PROCESS_LAUNCHER(process_launcher_thread_.Pass());
 883         break;
 884       }
 885       case BrowserThread::CACHE: {
 886         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:CacheThread");
 887         ResetThread_CACHE(cache_thread_.Pass());
 888         break;
 889       }
 890       case BrowserThread::IO: {
 891         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:IOThread");
 892         ResetThread_IO(io_thread_.Pass());
 893         break;
 894       }
 895       case BrowserThread::UI:
 896       case BrowserThread::ID_COUNT:
 897       default:
 898         NOTREACHED();
 899         break;
 900     }
 901   }
 902
 903 #if !defined(OS_IOS)
 904   {
 905     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:IndexedDBThread");
 906     ResetThread_IndexedDb(indexed_db_thread_.Pass());
 907   }
 908 #endif
 909
 910   // Close the blocking I/O pool after the other threads. Other threads such
 911   // as the I/O thread may need to schedule work like closing files or flushing
 912   // data during shutdown, so the blocking pool needs to be available. There
 913   // may also be slow operations pending that will blcok shutdown, so closing
 914   // it here (which will block until required operations are complete) gives
 915   // more head start for those operations to finish.
 916   {
 917     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:ThreadPool");
 918     BrowserThreadImpl::ShutdownThreadPool();
 919   }
 920
 921 #if !defined(OS_IOS)
 922   // Must happen after the IO thread is shutdown since this may be accessed from
 923   // it.
 924   {
 925     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:GPUChannelFactory");
 926     if (BrowserGpuChannelHostFactory::instance())
 927       BrowserGpuChannelHostFactory::Terminate();
 928   }
 929
 930   // Must happen after the I/O thread is shutdown since this class lives on the
 931   // I/O thread and isn't threadsafe.
 932   {
 933     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:GamepadService");
 934     GamepadService::GetInstance()->Terminate();
 935   }
 936   {
 937     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:SensorService");
 938     DeviceInertialSensorService::GetInstance()->Shutdown();
 939   }
 940   {
 941     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:BatteryStatusService");
 942     BatteryStatusService::GetInstance()->Shutdown();
 943   }
 944   {
 945     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:DeleteDataSources");
 946     URLDataManager::DeleteDataSources();
 947   }
 948 #endif  // !defined(OS_IOS)
 949
 950   if (parts_) {
 951     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:PostDestroyThreads");
 952     parts_->PostDestroyThreads();
 953   }
 954 }
 955
 956 void BrowserMainLoop::StopStartupTracingTimer() {
 957   startup_trace_timer_.Stop();
 958 }
 959
 960 void BrowserMainLoop::InitializeMainThread() {
 961   TRACE_EVENT0("startup", "BrowserMainLoop::InitializeMainThread");
 962   const char* kThreadName = "CrBrowserMain";
 963   base::PlatformThread::SetName(kThreadName);
 964   if (main_message_loop_)
 965     main_message_loop_->set_thread_name(kThreadName);
 966
 967   // Register the main thread by instantiating it, but don't call any methods.
 968   main_thread_.reset(
 969       new BrowserThreadImpl(BrowserThread::UI, base::MessageLoop::current()));
 970 }
 971
 972 int BrowserMainLoop::BrowserThreadsStarted() {
 973   TRACE_EVENT0("startup", "BrowserMainLoop::BrowserThreadsStarted");
 974
 975 #if !defined(OS_IOS)
 976   indexed_db_thread_.reset(new base::Thread("IndexedDB"));
 977   indexed_db_thread_->Start();
 978 #endif
 979
 980 #if defined(OS_ANDROID)
 981   // Up the priority of anything that touches with display tasks
 982   // (this thread is UI thread, and io_thread_ is for IPCs).
 983   io_thread_->SetPriority(base::kThreadPriority_Display);
 984   base::PlatformThread::SetThreadPriority(
 985       base::PlatformThread::CurrentHandle(),
 986       base::kThreadPriority_Display);
 987 #endif
 988
 989 #if !defined(OS_IOS)
 990   HistogramSynchronizer::GetInstance();
 991
 992   bool initialize_gpu_data_manager = true;
 993 #if defined(OS_ANDROID)
 994   // On Android, GLSurface::InitializeOneOff() must be called before initalizing
 995   // the GpuDataManagerImpl as it uses the GL bindings. crbug.com/326295
 996   if (!gfx::GLSurface::InitializeOneOff()) {
 997     LOG(ERROR) << "GLSurface::InitializeOneOff failed";
 998     initialize_gpu_data_manager = false;
 999   }
1000 #endif
1001
1002   // Initialize the GpuDataManager before we set up the MessageLoops because
1003   // otherwise we'll trigger the assertion about doing IO on the UI thread.
1004   if (initialize_gpu_data_manager)
1005     GpuDataManagerImpl::GetInstance()->Initialize();
1006
1007   bool always_uses_gpu = true;
1008   bool established_gpu_channel = false;
1009 #if defined(USE_AURA) || defined(OS_MACOSX)
1010   if (ShouldInitializeBrowserGpuChannelAndTransportSurface()) {
1011     established_gpu_channel = true;
1012     if (!GpuDataManagerImpl::GetInstance()->CanUseGpuBrowserCompositor()) {
1013       established_gpu_channel = always_uses_gpu = false;
1014     }
1015     BrowserGpuChannelHostFactory::Initialize(established_gpu_channel);
1016     ImageTransportFactory::Initialize();
1017 #if defined(USE_AURA)
1018     if (aura::Env::GetInstance()) {
1019       aura::Env::GetInstance()->set_context_factory(GetContextFactory());
1020     }
1021 #endif
1022   }
1023 #elif defined(OS_ANDROID)
1024   established_gpu_channel = true;
1025   BrowserGpuChannelHostFactory::Initialize(established_gpu_channel);
1026 #endif
1027
1028 #if defined(OS_LINUX) && defined(USE_UDEV)
1029   device_monitor_linux_.reset(new DeviceMonitorLinux());
1030 #elif defined(OS_MACOSX)
1031   device_monitor_mac_.reset(new DeviceMonitorMac());
1032 #endif
1033
1034   // RDH needs the IO thread to be created
1035   {
1036     TRACE_EVENT0("startup",
1037       "BrowserMainLoop::BrowserThreadsStarted:InitResourceDispatcherHost");
1038     resource_dispatcher_host_.reset(new ResourceDispatcherHostImpl());
1039   }
1040
1041   // MediaStreamManager needs the IO thread to be created.
1042   {
1043     TRACE_EVENT0("startup",
1044       "BrowserMainLoop::BrowserThreadsStarted:InitMediaStreamManager");
1045     media_stream_manager_.reset(new MediaStreamManager(audio_manager_.get()));
1046   }
1047
1048   {
1049     TRACE_EVENT0("startup",
1050       "BrowserMainLoop::BrowserThreadsStarted:InitSpeechRecognition");
1051     speech_recognition_manager_.reset(new SpeechRecognitionManagerImpl(
1052         audio_manager_.get(), media_stream_manager_.get()));
1053   }
1054
1055   {
1056     TRACE_EVENT0(
1057         "startup",
1058         "BrowserMainLoop::BrowserThreadsStarted::InitUserInputMonitor");
1059     user_input_monitor_ = media::UserInputMonitor::Create(
1060         io_thread_->message_loop_proxy(), main_thread_->message_loop_proxy());
1061   }
1062
1063   {
1064     TRACE_EVENT0("startup",
1065                  "BrowserMainLoop::BrowserThreadsStarted::TimeZoneMonitor");
1066     time_zone_monitor_ = TimeZoneMonitor::Create();
1067   }
1068
1069   // Alert the clipboard class to which threads are allowed to access the
1070   // clipboard:
1071   std::vector<base::PlatformThreadId> allowed_clipboard_threads;
1072   // The current thread is the UI thread.
1073   allowed_clipboard_threads.push_back(base::PlatformThread::CurrentId());
1074 #if defined(OS_WIN)
1075   // On Windows, clipboards are also used on the File or IO threads.
1076   allowed_clipboard_threads.push_back(file_thread_->thread_id());
1077   allowed_clipboard_threads.push_back(io_thread_->thread_id());
1078 #endif
1079   ui::Clipboard::SetAllowedThreads(allowed_clipboard_threads);
1080
1081   // When running the GPU thread in-process, avoid optimistically starting it
1082   // since creating the GPU thread races against creation of the one-and-only
1083   // ChildProcess instance which is created by the renderer thread.
1084   if (GpuDataManagerImpl::GetInstance()->GpuAccessAllowed(NULL) &&
1085       !established_gpu_channel &&
1086       always_uses_gpu &&
1087       !parsed_command_line_.HasSwitch(switches::kSingleProcess) &&
1088       !parsed_command_line_.HasSwitch(switches::kInProcessGPU)) {
1089     TRACE_EVENT_INSTANT0("gpu", "Post task to launch GPU process",
1090                          TRACE_EVENT_SCOPE_THREAD);
1091     BrowserThread::PostTask(
1092         BrowserThread::IO, FROM_HERE, base::Bind(
1093             base::IgnoreResult(&GpuProcessHost::Get),
1094             GpuProcessHost::GPU_PROCESS_KIND_SANDBOXED,
1095             CAUSE_FOR_GPU_LAUNCH_BROWSER_STARTUP));
1096   }
1097
1098 #if defined(OS_MACOSX)
1099   ThemeHelperMac::GetInstance();
1100   SystemHotkeyHelperMac::GetInstance()->DeferredLoadSystemHotkeys();
1101   if (ShouldEnableBootstrapSandbox()) {
1102     TRACE_EVENT0("startup",
1103         "BrowserMainLoop::BrowserThreadsStarted:BootstrapSandbox");
1104     CHECK(GetBootstrapSandbox());
1105   }
1106 #endif  // defined(OS_MACOSX)
1107
1108 #endif  // !defined(OS_IOS)
1109
1110   return result_code_;
1111 }
1112
1113 bool BrowserMainLoop::InitializeToolkit() {
1114   TRACE_EVENT0("startup", "BrowserMainLoop::InitializeToolkit");
1115   // TODO(evan): this function is rather subtle, due to the variety
1116   // of intersecting ifdefs we have.  To keep it easy to follow, there
1117   // are no #else branches on any #ifs.
1118   // TODO(stevenjb): Move platform specific code into platform specific Parts
1119   // (Need to add InitializeToolkit stage to BrowserParts).
1120   // See also GTK setup in EarlyInitialization, above, and associated comments.
1121
1122 #if defined(OS_WIN)
1123   // Init common control sex.
1124   INITCOMMONCONTROLSEX config;
1125   config.dwSize = sizeof(config);
1126   config.dwICC = ICC_WIN95_CLASSES;
1127   if (!InitCommonControlsEx(&config))
1128     PLOG(FATAL);
1129 #endif
1130
1131 #if defined(USE_AURA)
1132
1133 #if defined(USE_X11)
1134   if (!gfx::GetXDisplay())
1135     return false;
1136 #endif
1137
1138   // Env creates the compositor. Aura widgets need the compositor to be created
1139   // before they can be initialized by the browser.
1140   aura::Env::CreateInstance(true);
1141 #endif  // defined(USE_AURA)
1142
1143   if (parts_)
1144     parts_->ToolkitInitialized();
1145
1146   return true;
1147 }
1148
1149 void BrowserMainLoop::MainMessageLoopRun() {
1150 #if defined(OS_ANDROID)
1151   // Android's main message loop is the Java message loop.
1152   NOTREACHED();
1153 #else
1154   DCHECK(base::MessageLoopForUI::IsCurrent());
1155   if (parameters_.ui_task)
1156     base::MessageLoopForUI::current()->PostTask(FROM_HERE,
1157                                                 *parameters_.ui_task);
1158
1159   base::RunLoop run_loop;
1160   run_loop.Run();
1161 #endif
1162 }
1163
1164 base::FilePath BrowserMainLoop::GetStartupTraceFileName(
1165     const base::CommandLine& command_line) const {
1166   base::FilePath trace_file = command_line.GetSwitchValuePath(
1167       switches::kTraceStartupFile);
1168   // trace_file = "none" means that startup events will show up for the next
1169   // begin/end tracing (via about:tracing or AutomationProxy::BeginTracing/
1170   // EndTracing, for example).
1171   if (trace_file == base::FilePath().AppendASCII("none"))
1172     return trace_file;
1173
1174   if (trace_file.empty()) {
1175 #if defined(OS_ANDROID)
1176     TracingControllerAndroid::GenerateTracingFilePath(&trace_file);
1177 #else
1178     // Default to saving the startup trace into the current dir.
1179     trace_file = base::FilePath().AppendASCII("chrometrace.log");
1180 #endif
1181   }
1182
1183   return trace_file;
1184 }
1185
1186 void BrowserMainLoop::InitStartupTracing(
1187     const base::CommandLine& command_line) {
1188   DCHECK(is_tracing_startup_);
1189
1190   startup_trace_file_ = GetStartupTraceFileName(parsed_command_line_);
1191
1192   std::string delay_str = command_line.GetSwitchValueASCII(
1193       switches::kTraceStartupDuration);
1194   int delay_secs = 5;
1195   if (!delay_str.empty() && !base::StringToInt(delay_str, &delay_secs)) {
1196     DLOG(WARNING) << "Could not parse --" << switches::kTraceStartupDuration
1197         << "=" << delay_str << " defaulting to 5 (secs)";
1198     delay_secs = 5;
1199   }
1200
1201   startup_trace_timer_.Start(FROM_HERE,
1202                              base::TimeDelta::FromSeconds(delay_secs),
1203                              this,
1204                              &BrowserMainLoop::EndStartupTracing);
1205 }
1206
1207 void BrowserMainLoop::EndStartupTracing() {
1208   is_tracing_startup_ = false;
1209   TracingController::GetInstance()->DisableRecording(
1210       TracingController::CreateFileSink(
1211           startup_trace_file_,
1212           base::Bind(OnStoppedStartupTracing, startup_trace_file_)));
1213 }
1214
1215 }  // namespace content