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/pending_task.h"
  15 #include "base/power_monitor/power_monitor.h"
  16 #include "base/power_monitor/power_monitor_device_source.h"
  17 #include "base/process/process_metrics.h"
  18 #include "base/run_loop.h"
  19 #include "base/strings/string_number_conversions.h"
  20 #include "base/system_monitor/system_monitor.h"
  21 #include "base/thread_task_runner_handle.h"
  22 #include "base/threading/thread_restrictions.h"
  23 #include "base/timer/hi_res_timer_manager.h"
  24 #include "content/browser/browser_thread_impl.h"
  25 #include "content/browser/device_sensors/device_inertial_sensor_service.h"
  26 #include "content/browser/download/save_file_manager.h"
  27 #include "content/browser/gamepad/gamepad_service.h"
  28 #include "content/browser/gpu/browser_gpu_channel_host_factory.h"
  29 #include "content/browser/gpu/compositor_util.h"
  30 #include "content/browser/gpu/gpu_data_manager_impl.h"
  31 #include "content/browser/gpu/gpu_process_host.h"
  32 #include "content/browser/gpu/gpu_process_host_ui_shim.h"
  33 #include "content/browser/histogram_synchronizer.h"
  34 #include "content/browser/loader/resource_dispatcher_host_impl.h"
  35 #include "content/browser/media/media_internals.h"
  36 #include "content/browser/net/browser_online_state_observer.h"
  37 #include "content/browser/renderer_host/media/media_stream_manager.h"
  38 #include "content/browser/speech/speech_recognition_manager_impl.h"
  39 #include "content/browser/startup_task_runner.h"
  40 #include "content/browser/time_zone_monitor.h"
  41 #include "content/browser/webui/content_web_ui_controller_factory.h"
  42 #include "content/browser/webui/url_data_manager.h"
  43 #include "content/public/browser/browser_main_parts.h"
  44 #include "content/public/browser/browser_shutdown.h"
  45 #include "content/public/browser/content_browser_client.h"
  46 #include "content/public/browser/render_process_host.h"
  47 #include "content/public/browser/tracing_controller.h"
  48 #include "content/public/common/content_switches.h"
  49 #include "content/public/common/main_function_params.h"
  50 #include "content/public/common/result_codes.h"
  51 #include "crypto/nss_util.h"
  52 #include "device/battery/battery_status_service.h"
  53 #include "media/audio/audio_manager.h"
  54 #include "media/base/media.h"
  55 #include "media/base/user_input_monitor.h"
  56 #include "media/midi/midi_manager.h"
  57 #include "net/base/network_change_notifier.h"
  58 #include "net/socket/client_socket_factory.h"
  59 #include "net/ssl/ssl_config_service.h"
  60 #include "ui/base/clipboard/clipboard.h"
  61
  62 #if defined(USE_AURA) || (defined(OS_MACOSX) && !defined(OS_IOS))
  63 #include "content/browser/compositor/image_transport_factory.h"
  64 #endif
  65
  66 #if defined(USE_AURA)
  67 #include "content/public/browser/context_factory.h"
  68 #include "ui/aura/env.h"
  69 #endif
  70
  71 #if !defined(OS_IOS)
  72 #include "content/browser/renderer_host/render_process_host_impl.h"
  73 #endif
  74
  75 #if defined(OS_ANDROID)
  76 #include "base/android/jni_android.h"
  77 #include "content/browser/android/browser_startup_controller.h"
  78 #include "content/browser/android/browser_surface_texture_manager.h"
  79 #include "content/browser/android/tracing_controller_android.h"
  80 #include "content/browser/screen_orientation/screen_orientation_delegate_android.h"
  81 #include "content/public/browser/screen_orientation_provider.h"
  82 #include "ui/gl/gl_surface.h"
  83 #endif
  84
  85 #if defined(OS_MACOSX) && !defined(OS_IOS)
  86 #include "content/browser/bootstrap_sandbox_mac.h"
  87 #include "content/browser/cocoa/system_hotkey_helper_mac.h"
  88 #include "content/browser/compositor/browser_compositor_view_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 // Disable optimizations for this block of functions so the compiler doesn't
 236 // merge them all together. This makes it possible to tell what thread was
 237 // unresponsive by inspecting the callstack.
 238 MSVC_DISABLE_OPTIMIZE()
 239 MSVC_PUSH_DISABLE_WARNING(4748)
 240
 241 NOINLINE void ResetThread_DB(scoped_ptr<BrowserProcessSubThread> thread) {
 242   volatile int inhibit_comdat = __LINE__;
 243   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 244   thread.reset();
 245 }
 246
 247 NOINLINE void ResetThread_FILE(scoped_ptr<BrowserProcessSubThread> thread) {
 248   volatile int inhibit_comdat = __LINE__;
 249   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 250   thread.reset();
 251 }
 252
 253 NOINLINE void ResetThread_FILE_USER_BLOCKING(
 254     scoped_ptr<BrowserProcessSubThread> thread) {
 255   volatile int inhibit_comdat = __LINE__;
 256   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 257   thread.reset();
 258 }
 259
 260 NOINLINE void ResetThread_PROCESS_LAUNCHER(
 261     scoped_ptr<BrowserProcessSubThread> thread) {
 262   volatile int inhibit_comdat = __LINE__;
 263   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 264   thread.reset();
 265 }
 266
 267 NOINLINE void ResetThread_CACHE(scoped_ptr<BrowserProcessSubThread> thread) {
 268   volatile int inhibit_comdat = __LINE__;
 269   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 270   thread.reset();
 271 }
 272
 273 NOINLINE void ResetThread_IO(scoped_ptr<BrowserProcessSubThread> thread) {
 274   volatile int inhibit_comdat = __LINE__;
 275   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 276   thread.reset();
 277 }
 278
 279 #if !defined(OS_IOS)
 280 NOINLINE void ResetThread_IndexedDb(scoped_ptr<base::Thread> thread) {
 281   volatile int inhibit_comdat = __LINE__;
 282   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 283   thread.reset();
 284 }
 285 #endif
 286
 287 MSVC_POP_WARNING()
 288 MSVC_ENABLE_OPTIMIZE();
 289
 290 }  // namespace
 291
 292 // The currently-running BrowserMainLoop.  There can be one or zero.
 293 BrowserMainLoop* g_current_browser_main_loop = NULL;
 294
 295 // This is just to be able to keep ShutdownThreadsAndCleanUp out of
 296 // the public interface of BrowserMainLoop.
 297 class BrowserShutdownImpl {
 298  public:
 299   static void ImmediateShutdownAndExitProcess() {
 300     DCHECK(g_current_browser_main_loop);
 301     g_current_browser_main_loop->ShutdownThreadsAndCleanUp();
 302
 303 #if defined(OS_WIN)
 304     // At this point the message loop is still running yet we've shut everything
 305     // down. If any messages are processed we'll likely crash. Exit now.
 306     ExitProcess(RESULT_CODE_NORMAL_EXIT);
 307 #elif defined(OS_POSIX) && !defined(OS_MACOSX)
 308     _exit(RESULT_CODE_NORMAL_EXIT);
 309 #else
 310     NOTIMPLEMENTED();
 311 #endif
 312   }
 313 };
 314
 315 void ImmediateShutdownAndExitProcess() {
 316   BrowserShutdownImpl::ImmediateShutdownAndExitProcess();
 317 }
 318
 319 // For measuring memory usage after each task. Behind a command line flag.
 320 class BrowserMainLoop::MemoryObserver : public base::MessageLoop::TaskObserver {
 321  public:
 322   MemoryObserver() {}
 323   ~MemoryObserver() override {}
 324
 325   void WillProcessTask(const base::PendingTask& pending_task) override {}
 326
 327   void DidProcessTask(const base::PendingTask& pending_task) override {
 328 #if !defined(OS_IOS)  // No ProcessMetrics on IOS.
 329     scoped_ptr<base::ProcessMetrics> process_metrics(
 330         base::ProcessMetrics::CreateProcessMetrics(
 331 #if defined(OS_MACOSX)
 332             base::GetCurrentProcessHandle(), NULL));
 333 #else
 334             base::GetCurrentProcessHandle()));
 335 #endif
 336     size_t private_bytes;
 337     process_metrics->GetMemoryBytes(&private_bytes, NULL);
 338     LOCAL_HISTOGRAM_MEMORY_KB("Memory.BrowserUsed", private_bytes >> 10);
 339 #endif
 340   }
 341  private:
 342   DISALLOW_COPY_AND_ASSIGN(MemoryObserver);
 343 };
 344
 345
 346 // BrowserMainLoop construction / destruction =============================
 347
 348 BrowserMainLoop* BrowserMainLoop::GetInstance() {
 349   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 350   return g_current_browser_main_loop;
 351 }
 352
 353 BrowserMainLoop::BrowserMainLoop(const MainFunctionParams& parameters)
 354     : parameters_(parameters),
 355       parsed_command_line_(parameters.command_line),
 356       result_code_(RESULT_CODE_NORMAL_EXIT),
 357       created_threads_(false),
 358       // ContentMainRunner should have enabled tracing of the browser process
 359       // when kTraceStartup is in the command line.
 360       is_tracing_startup_(
 361           parameters.command_line.HasSwitch(switches::kTraceStartup)) {
 362   DCHECK(!g_current_browser_main_loop);
 363   g_current_browser_main_loop = this;
 364 }
 365
 366 BrowserMainLoop::~BrowserMainLoop() {
 367   DCHECK_EQ(this, g_current_browser_main_loop);
 368 #if !defined(OS_IOS)
 369   ui::Clipboard::DestroyClipboardForCurrentThread();
 370 #endif  // !defined(OS_IOS)
 371   g_current_browser_main_loop = NULL;
 372 }
 373
 374 void BrowserMainLoop::Init() {
 375   TRACE_EVENT0("startup", "BrowserMainLoop::Init");
 376   parts_.reset(
 377       GetContentClient()->browser()->CreateBrowserMainParts(parameters_));
 378 }
 379
 380 // BrowserMainLoop stages ==================================================
 381
 382 void BrowserMainLoop::EarlyInitialization() {
 383   TRACE_EVENT0("startup", "BrowserMainLoop::EarlyInitialization");
 384
 385 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 386   // No thread should be created before this call, as SetupSandbox()
 387   // will end-up using fork().
 388   SetupSandbox(parsed_command_line_);
 389 #endif
 390
 391 #if defined(USE_X11)
 392   if (parsed_command_line_.HasSwitch(switches::kSingleProcess) ||
 393       parsed_command_line_.HasSwitch(switches::kInProcessGPU)) {
 394     if (!gfx::InitializeThreadedX11()) {
 395       LOG(ERROR) << "Failed to put Xlib into threaded mode.";
 396     }
 397   }
 398 #endif
 399
 400   // GLib's spawning of new processes is buggy, so it's important that at this
 401   // point GLib does not need to start DBUS. Chrome should always start with
 402   // DBUS_SESSION_BUS_ADDRESS properly set. See crbug.com/309093.
 403 #if defined(USE_GLIB)
 404   // g_type_init will be deprecated in 2.36. 2.35 is the development
 405   // version for 2.36, hence do not call g_type_init starting 2.35.
 406   // http://developer.gnome.org/gobject/unstable/gobject-Type-Information.html#g-type-init
 407 #if !GLIB_CHECK_VERSION(2, 35, 0)
 408   // GLib type system initialization. Needed at least for gconf,
 409   // used in net/proxy/proxy_config_service_linux.cc. Most likely
 410   // this is superfluous as gtk_init() ought to do this. It's
 411   // definitely harmless, so retained as a reminder of this
 412   // requirement for gconf.
 413   g_type_init();
 414 #endif
 415
 416   SetUpGLibLogHandler();
 417 #endif
 418
 419   if (parts_)
 420     parts_->PreEarlyInitialization();
 421
 422 #if defined(OS_MACOSX)
 423   // We use quite a few file descriptors for our IPC, and the default limit on
 424   // the Mac is low (256), so bump it up.
 425   base::SetFdLimit(1024);
 426 #endif
 427
 428 #if defined(OS_WIN)
 429   net::EnsureWinsockInit();
 430 #endif
 431
 432 #if !defined(USE_OPENSSL)
 433   // We want to be sure to init NSPR on the main thread.
 434   crypto::EnsureNSPRInit();
 435 #endif  // !defined(USE_OPENSSL)
 436
 437 #if !defined(OS_IOS)
 438   if (parsed_command_line_.HasSwitch(switches::kRendererProcessLimit)) {
 439     std::string limit_string = parsed_command_line_.GetSwitchValueASCII(
 440         switches::kRendererProcessLimit);
 441     size_t process_limit;
 442     if (base::StringToSizeT(limit_string, &process_limit)) {
 443       RenderProcessHost::SetMaxRendererProcessCount(process_limit);
 444     }
 445   }
 446 #endif  // !defined(OS_IOS)
 447
 448   if (parsed_command_line_.HasSwitch(switches::kEnableNativeGpuMemoryBuffers)) {
 449     BrowserGpuChannelHostFactory::EnableGpuMemoryBufferFactoryUsage(
 450         gfx::GpuMemoryBuffer::MAP);
 451   }
 452
 453 #if defined(USE_OZONE)
 454   BrowserGpuChannelHostFactory::EnableGpuMemoryBufferFactoryUsage(
 455       gfx::GpuMemoryBuffer::SCANOUT);
 456 #endif
 457
 458   if (parts_)
 459     parts_->PostEarlyInitialization();
 460 }
 461
 462 void BrowserMainLoop::MainMessageLoopStart() {
 463   TRACE_EVENT0("startup", "BrowserMainLoop::MainMessageLoopStart");
 464   if (parts_) {
 465     TRACE_EVENT0("startup",
 466         "BrowserMainLoop::MainMessageLoopStart:PreMainMessageLoopStart");
 467     parts_->PreMainMessageLoopStart();
 468   }
 469
 470 #if defined(OS_WIN)
 471   // If we're running tests (ui_task is non-null), then the ResourceBundle
 472   // has already been initialized.
 473   if (!parameters_.ui_task) {
 474     // Override the configured locale with the user's preferred UI language.
 475     l10n_util::OverrideLocaleWithUILanguageList();
 476   }
 477 #endif
 478
 479   // Create a MessageLoop if one does not already exist for the current thread.
 480   if (!base::MessageLoop::current())
 481     main_message_loop_.reset(new base::MessageLoopForUI);
 482
 483   InitializeMainThread();
 484
 485   {
 486     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:SystemMonitor");
 487     system_monitor_.reset(new base::SystemMonitor);
 488   }
 489   {
 490     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:PowerMonitor");
 491     scoped_ptr<base::PowerMonitorSource> power_monitor_source(
 492       new base::PowerMonitorDeviceSource());
 493     power_monitor_.reset(new base::PowerMonitor(power_monitor_source.Pass()));
 494   }
 495   {
 496     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:HighResTimerManager");
 497     hi_res_timer_manager_.reset(new base::HighResolutionTimerManager);
 498   }
 499   {
 500     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:NetworkChangeNotifier");
 501     network_change_notifier_.reset(net::NetworkChangeNotifier::Create());
 502   }
 503
 504 #if !defined(OS_IOS)
 505   {
 506     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:MediaFeatures");
 507     media::InitializeCPUSpecificMediaFeatures();
 508   }
 509   {
 510     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:AudioMan");
 511     audio_manager_.reset(media::AudioManager::Create(
 512         MediaInternals::GetInstance()));
 513   }
 514   {
 515     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:MidiManager");
 516     midi_manager_.reset(media::MidiManager::Create());
 517   }
 518   {
 519     TRACE_EVENT0("startup",
 520                  "BrowserMainLoop::Subsystem:ContentWebUIController");
 521     WebUIControllerFactory::RegisterFactory(
 522         ContentWebUIControllerFactory::GetInstance());
 523   }
 524
 525   {
 526     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:OnlineStateObserver");
 527     online_state_observer_.reset(new BrowserOnlineStateObserver);
 528   }
 529
 530   {
 531     system_stats_monitor_.reset(new base::debug::TraceEventSystemStatsMonitor(
 532         base::ThreadTaskRunnerHandle::Get()));
 533   }
 534 #endif  // !defined(OS_IOS)
 535
 536 #if defined(OS_WIN)
 537   system_message_window_.reset(new SystemMessageWindowWin);
 538 #endif
 539
 540   if (parts_)
 541     parts_->PostMainMessageLoopStart();
 542
 543 #if !defined(OS_IOS)
 544   // Start tracing to a file if needed. Only do this after starting the main
 545   // message loop to avoid calling MessagePumpForUI::ScheduleWork() before
 546   // MessagePumpForUI::Start() as it will crash the browser.
 547   if (is_tracing_startup_) {
 548     TRACE_EVENT0("startup", "BrowserMainLoop::InitStartupTracing");
 549     InitStartupTracing(parsed_command_line_);
 550   }
 551 #endif  // !defined(OS_IOS)
 552
 553 #if defined(OS_ANDROID)
 554   {
 555     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:SurfaceTextureManager");
 556     SurfaceTextureManager::InitInstance(new BrowserSurfaceTextureManager);
 557   }
 558
 559   {
 560     TRACE_EVENT0("startup",
 561                  "BrowserMainLoop::Subsystem:ScreenOrientationProvider");
 562     screen_orientation_delegate_.reset(
 563         new ScreenOrientationDelegateAndroid());
 564     ScreenOrientationProvider::SetDelegate(screen_orientation_delegate_.get());
 565   }
 566 #endif
 567
 568   if (parsed_command_line_.HasSwitch(switches::kMemoryMetrics)) {
 569     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:MemoryObserver");
 570     memory_observer_.reset(new MemoryObserver());
 571     base::MessageLoop::current()->AddTaskObserver(memory_observer_.get());
 572   }
 573
 574 #if defined(TCMALLOC_TRACE_MEMORY_SUPPORTED)
 575   trace_memory_controller_.reset(new base::debug::TraceMemoryController(
 576       base::MessageLoop::current()->message_loop_proxy(),
 577       ::HeapProfilerWithPseudoStackStart,
 578       ::HeapProfilerStop,
 579       ::GetHeapProfile));
 580 #endif
 581 }
 582
 583 int BrowserMainLoop::PreCreateThreads() {
 584   if (parts_) {
 585     TRACE_EVENT0("startup",
 586         "BrowserMainLoop::CreateThreads:PreCreateThreads");
 587     result_code_ = parts_->PreCreateThreads();
 588   }
 589
 590 #if defined(ENABLE_PLUGINS)
 591   // Prior to any processing happening on the io thread, we create the
 592   // plugin service as it is predominantly used from the io thread,
 593   // but must be created on the main thread. The service ctor is
 594   // inexpensive and does not invoke the io_thread() accessor.
 595   {
 596     TRACE_EVENT0("startup", "BrowserMainLoop::CreateThreads:PluginService");
 597     PluginService::GetInstance()->Init();
 598   }
 599 #endif
 600
 601 #if !defined(OS_IOS) && (!defined(GOOGLE_CHROME_BUILD) || defined(OS_ANDROID))
 602   // Single-process is an unsupported and not fully tested mode, so
 603   // don't enable it for official Chrome builds (except on Android).
 604   if (parsed_command_line_.HasSwitch(switches::kSingleProcess))
 605     RenderProcessHost::SetRunRendererInProcess(true);
 606 #endif
 607   return result_code_;
 608 }
 609
 610 void BrowserMainLoop::CreateStartupTasks() {
 611   TRACE_EVENT0("startup", "BrowserMainLoop::CreateStartupTasks");
 612
 613   // First time through, we really want to create all the tasks
 614   if (!startup_task_runner_.get()) {
 615 #if defined(OS_ANDROID)
 616     startup_task_runner_ = make_scoped_ptr(new StartupTaskRunner(
 617         base::Bind(&BrowserStartupComplete),
 618         base::MessageLoop::current()->message_loop_proxy()));
 619 #else
 620     startup_task_runner_ = make_scoped_ptr(new StartupTaskRunner(
 621         base::Callback<void(int)>(),
 622         base::MessageLoop::current()->message_loop_proxy()));
 623 #endif
 624     StartupTask pre_create_threads =
 625         base::Bind(&BrowserMainLoop::PreCreateThreads, base::Unretained(this));
 626     startup_task_runner_->AddTask(pre_create_threads);
 627
 628     StartupTask create_threads =
 629         base::Bind(&BrowserMainLoop::CreateThreads, base::Unretained(this));
 630     startup_task_runner_->AddTask(create_threads);
 631
 632     StartupTask browser_thread_started = base::Bind(
 633         &BrowserMainLoop::BrowserThreadsStarted, base::Unretained(this));
 634     startup_task_runner_->AddTask(browser_thread_started);
 635
 636     StartupTask pre_main_message_loop_run = base::Bind(
 637         &BrowserMainLoop::PreMainMessageLoopRun, base::Unretained(this));
 638     startup_task_runner_->AddTask(pre_main_message_loop_run);
 639
 640 #if defined(OS_ANDROID)
 641     if (BrowserMayStartAsynchronously()) {
 642       startup_task_runner_->StartRunningTasksAsync();
 643     }
 644 #endif
 645   }
 646 #if defined(OS_ANDROID)
 647   if (!BrowserMayStartAsynchronously()) {
 648     // A second request for asynchronous startup can be ignored, so
 649     // StartupRunningTasksAsync is only called first time through. If, however,
 650     // this is a request for synchronous startup then it must override any
 651     // previous call for async startup, so we call RunAllTasksNow()
 652     // unconditionally.
 653     startup_task_runner_->RunAllTasksNow();
 654   }
 655 #else
 656   startup_task_runner_->RunAllTasksNow();
 657 #endif
 658 }
 659
 660 int BrowserMainLoop::CreateThreads() {
 661   TRACE_EVENT0("startup", "BrowserMainLoop::CreateThreads");
 662
 663   base::Thread::Options io_message_loop_options;
 664   io_message_loop_options.message_loop_type = base::MessageLoop::TYPE_IO;
 665   base::Thread::Options ui_message_loop_options;
 666   ui_message_loop_options.message_loop_type = base::MessageLoop::TYPE_UI;
 667
 668   // Start threads in the order they occur in the BrowserThread::ID
 669   // enumeration, except for BrowserThread::UI which is the main
 670   // thread.
 671   //
 672   // Must be size_t so we can increment it.
 673   for (size_t thread_id = BrowserThread::UI + 1;
 674        thread_id < BrowserThread::ID_COUNT;
 675        ++thread_id) {
 676     scoped_ptr<BrowserProcessSubThread>* thread_to_start = NULL;
 677     base::Thread::Options options;
 678
 679     switch (thread_id) {
 680       case BrowserThread::DB:
 681         TRACE_EVENT_BEGIN1("startup",
 682             "BrowserMainLoop::CreateThreads:start",
 683             "Thread", "BrowserThread::DB");
 684         thread_to_start = &db_thread_;
 685         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 686         break;
 687       case BrowserThread::FILE_USER_BLOCKING:
 688         TRACE_EVENT_BEGIN1("startup",
 689             "BrowserMainLoop::CreateThreads:start",
 690             "Thread", "BrowserThread::FILE_USER_BLOCKING");
 691         thread_to_start = &file_user_blocking_thread_;
 692         break;
 693       case BrowserThread::FILE:
 694         TRACE_EVENT_BEGIN1("startup",
 695             "BrowserMainLoop::CreateThreads:start",
 696             "Thread", "BrowserThread::FILE");
 697         thread_to_start = &file_thread_;
 698 #if defined(OS_WIN)
 699         // On Windows, the FILE thread needs to be have a UI message loop
 700         // which pumps messages in such a way that Google Update can
 701         // communicate back to us.
 702         options = ui_message_loop_options;
 703 #else
 704         options = io_message_loop_options;
 705 #endif
 706         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 707         break;
 708       case BrowserThread::PROCESS_LAUNCHER:
 709         TRACE_EVENT_BEGIN1("startup",
 710             "BrowserMainLoop::CreateThreads:start",
 711             "Thread", "BrowserThread::PROCESS_LAUNCHER");
 712         thread_to_start = &process_launcher_thread_;
 713         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 714         break;
 715       case BrowserThread::CACHE:
 716         TRACE_EVENT_BEGIN1("startup",
 717             "BrowserMainLoop::CreateThreads:start",
 718             "Thread", "BrowserThread::CACHE");
 719         thread_to_start = &cache_thread_;
 720         options = io_message_loop_options;
 721         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 722         break;
 723       case BrowserThread::IO:
 724         TRACE_EVENT_BEGIN1("startup",
 725             "BrowserMainLoop::CreateThreads:start",
 726             "Thread", "BrowserThread::IO");
 727         thread_to_start = &io_thread_;
 728         options = io_message_loop_options;
 729         break;
 730       case BrowserThread::UI:
 731       case BrowserThread::ID_COUNT:
 732       default:
 733         NOTREACHED();
 734         break;
 735     }
 736
 737     BrowserThread::ID id = static_cast<BrowserThread::ID>(thread_id);
 738
 739     if (thread_to_start) {
 740       (*thread_to_start).reset(new BrowserProcessSubThread(id));
 741       if (!(*thread_to_start)->StartWithOptions(options)) {
 742         LOG(FATAL) << "Failed to start the browser thread: id == " << id;
 743       }
 744     } else {
 745       NOTREACHED();
 746     }
 747
 748     TRACE_EVENT_END0("startup", "BrowserMainLoop::CreateThreads:start");
 749   }
 750   created_threads_ = true;
 751   return result_code_;
 752 }
 753
 754 int BrowserMainLoop::PreMainMessageLoopRun() {
 755   if (parts_) {
 756     TRACE_EVENT0("startup",
 757         "BrowserMainLoop::CreateThreads:PreMainMessageLoopRun");
 758     parts_->PreMainMessageLoopRun();
 759   }
 760
 761   // If the UI thread blocks, the whole UI is unresponsive.
 762   // Do not allow disk IO from the UI thread.
 763   base::ThreadRestrictions::SetIOAllowed(false);
 764   base::ThreadRestrictions::DisallowWaiting();
 765   return result_code_;
 766 }
 767
 768 void BrowserMainLoop::RunMainMessageLoopParts() {
 769   TRACE_EVENT_BEGIN_ETW("BrowserMain:MESSAGE_LOOP", 0, "");
 770
 771   bool ran_main_loop = false;
 772   if (parts_)
 773     ran_main_loop = parts_->MainMessageLoopRun(&result_code_);
 774
 775   if (!ran_main_loop)
 776     MainMessageLoopRun();
 777
 778   TRACE_EVENT_END_ETW("BrowserMain:MESSAGE_LOOP", 0, "");
 779 }
 780
 781 void BrowserMainLoop::ShutdownThreadsAndCleanUp() {
 782   if (!created_threads_) {
 783     // Called early, nothing to do
 784     return;
 785   }
 786   TRACE_EVENT0("shutdown", "BrowserMainLoop::ShutdownThreadsAndCleanUp");
 787
 788   // Teardown may start in PostMainMessageLoopRun, and during teardown we
 789   // need to be able to perform IO.
 790   base::ThreadRestrictions::SetIOAllowed(true);
 791   BrowserThread::PostTask(
 792       BrowserThread::IO, FROM_HERE,
 793       base::Bind(base::IgnoreResult(&base::ThreadRestrictions::SetIOAllowed),
 794                  true));
 795
 796 #if !defined(OS_IOS)
 797   if (RenderProcessHost::run_renderer_in_process())
 798     RenderProcessHostImpl::ShutDownInProcessRenderer();
 799 #endif
 800
 801   if (parts_) {
 802     TRACE_EVENT0("shutdown",
 803                  "BrowserMainLoop::Subsystem:PostMainMessageLoopRun");
 804     parts_->PostMainMessageLoopRun();
 805   }
 806
 807   trace_memory_controller_.reset();
 808   system_stats_monitor_.reset();
 809
 810 #if !defined(OS_IOS)
 811   // Destroying the GpuProcessHostUIShims on the UI thread posts a task to
 812   // delete related objects on the GPU thread. This must be done before
 813   // stopping the GPU thread. The GPU thread will close IPC channels to renderer
 814   // processes so this has to happen before stopping the IO thread.
 815   {
 816     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:GPUProcessHostShim");
 817     GpuProcessHostUIShim::DestroyAll();
 818   }
 819   // Cancel pending requests and prevent new requests.
 820   if (resource_dispatcher_host_) {
 821     TRACE_EVENT0("shutdown",
 822                  "BrowserMainLoop::Subsystem:ResourceDispatcherHost");
 823     resource_dispatcher_host_.get()->Shutdown();
 824   }
 825
 826 #if defined(OS_MACOSX)
 827   BrowserCompositorMac::DisableRecyclingForShutdown();
 828 #endif
 829
 830 #if defined(USE_AURA) || defined(OS_MACOSX)
 831   {
 832     TRACE_EVENT0("shutdown",
 833                  "BrowserMainLoop::Subsystem:ImageTransportFactory");
 834     ImageTransportFactory::Terminate();
 835   }
 836 #endif
 837
 838 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 839   ZygoteHostImpl::GetInstance()->TearDownAfterLastChild();
 840 #endif  // defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 841
 842   // The device monitors are using |system_monitor_| as dependency, so delete
 843   // them before |system_monitor_| goes away.
 844   // On Mac and windows, the monitor needs to be destroyed on the same thread
 845   // as they were created. On Linux, the monitor will be deleted when IO thread
 846   // goes away.
 847 #if defined(OS_WIN)
 848   system_message_window_.reset();
 849 #elif defined(OS_MACOSX)
 850   device_monitor_mac_.reset();
 851 #endif
 852 #endif  // !defined(OS_IOS)
 853
 854   // Must be size_t so we can subtract from it.
 855   for (size_t thread_id = BrowserThread::ID_COUNT - 1;
 856        thread_id >= (BrowserThread::UI + 1);
 857        --thread_id) {
 858     // Find the thread object we want to stop. Looping over all valid
 859     // BrowserThread IDs and DCHECKing on a missing case in the switch
 860     // statement helps avoid a mismatch between this code and the
 861     // BrowserThread::ID enumeration.
 862     //
 863     // The destruction order is the reverse order of occurrence in the
 864     // BrowserThread::ID list. The rationale for the order is as
 865     // follows (need to be filled in a bit):
 866     //
 867     //
 868     // - The IO thread is the only user of the CACHE thread.
 869     //
 870     // - The PROCESS_LAUNCHER thread must be stopped after IO in case
 871     //   the IO thread posted a task to terminate a process on the
 872     //   process launcher thread.
 873     //
 874     // - (Not sure why DB stops last.)
 875     switch (thread_id) {
 876       case BrowserThread::DB: {
 877         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:DBThread");
 878         ResetThread_DB(db_thread_.Pass());
 879         break;
 880       }
 881       case BrowserThread::FILE: {
 882         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:FileThread");
 883 #if !defined(OS_IOS)
 884         // Clean up state that lives on or uses the file_thread_ before
 885         // it goes away.
 886         if (resource_dispatcher_host_)
 887           resource_dispatcher_host_.get()->save_file_manager()->Shutdown();
 888 #endif  // !defined(OS_IOS)
 889         ResetThread_FILE(file_thread_.Pass());
 890         break;
 891       }
 892       case BrowserThread::FILE_USER_BLOCKING: {
 893         TRACE_EVENT0("shutdown",
 894                       "BrowserMainLoop::Subsystem:FileUserBlockingThread");
 895         ResetThread_FILE_USER_BLOCKING(file_user_blocking_thread_.Pass());
 896         break;
 897       }
 898       case BrowserThread::PROCESS_LAUNCHER: {
 899         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:LauncherThread");
 900         ResetThread_PROCESS_LAUNCHER(process_launcher_thread_.Pass());
 901         break;
 902       }
 903       case BrowserThread::CACHE: {
 904         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:CacheThread");
 905         ResetThread_CACHE(cache_thread_.Pass());
 906         break;
 907       }
 908       case BrowserThread::IO: {
 909         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:IOThread");
 910         ResetThread_IO(io_thread_.Pass());
 911         break;
 912       }
 913       case BrowserThread::UI:
 914       case BrowserThread::ID_COUNT:
 915       default:
 916         NOTREACHED();
 917         break;
 918     }
 919   }
 920
 921 #if !defined(OS_IOS)
 922   {
 923     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:IndexedDBThread");
 924     ResetThread_IndexedDb(indexed_db_thread_.Pass());
 925   }
 926 #endif
 927
 928   // Close the blocking I/O pool after the other threads. Other threads such
 929   // as the I/O thread may need to schedule work like closing files or flushing
 930   // data during shutdown, so the blocking pool needs to be available. There
 931   // may also be slow operations pending that will blcok shutdown, so closing
 932   // it here (which will block until required operations are complete) gives
 933   // more head start for those operations to finish.
 934   {
 935     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:ThreadPool");
 936     BrowserThreadImpl::ShutdownThreadPool();
 937   }
 938
 939 #if !defined(OS_IOS)
 940   // Must happen after the IO thread is shutdown since this may be accessed from
 941   // it.
 942   {
 943     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:GPUChannelFactory");
 944     if (BrowserGpuChannelHostFactory::instance())
 945       BrowserGpuChannelHostFactory::Terminate();
 946   }
 947
 948   // Must happen after the I/O thread is shutdown since this class lives on the
 949   // I/O thread and isn't threadsafe.
 950   {
 951     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:GamepadService");
 952     GamepadService::GetInstance()->Terminate();
 953   }
 954   {
 955     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:SensorService");
 956     DeviceInertialSensorService::GetInstance()->Shutdown();
 957   }
 958   {
 959     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:BatteryStatusService");
 960     device::BatteryStatusService::GetInstance()->Shutdown();
 961   }
 962   {
 963     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:DeleteDataSources");
 964     URLDataManager::DeleteDataSources();
 965   }
 966 #endif  // !defined(OS_IOS)
 967
 968   if (parts_) {
 969     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:PostDestroyThreads");
 970     parts_->PostDestroyThreads();
 971   }
 972 }
 973
 974 void BrowserMainLoop::StopStartupTracingTimer() {
 975   startup_trace_timer_.Stop();
 976 }
 977
 978 void BrowserMainLoop::InitializeMainThread() {
 979   TRACE_EVENT0("startup", "BrowserMainLoop::InitializeMainThread");
 980   const char* kThreadName = "CrBrowserMain";
 981   base::PlatformThread::SetName(kThreadName);
 982   if (main_message_loop_)
 983     main_message_loop_->set_thread_name(kThreadName);
 984
 985   // Register the main thread by instantiating it, but don't call any methods.
 986   main_thread_.reset(
 987       new BrowserThreadImpl(BrowserThread::UI, base::MessageLoop::current()));
 988 }
 989
 990 int BrowserMainLoop::BrowserThreadsStarted() {
 991   TRACE_EVENT0("startup", "BrowserMainLoop::BrowserThreadsStarted");
 992
 993 #if !defined(OS_IOS)
 994   indexed_db_thread_.reset(new base::Thread("IndexedDB"));
 995   indexed_db_thread_->Start();
 996 #endif
 997
 998 #if defined(OS_ANDROID)
 999   // Up the priority of anything that touches with display tasks
1000   // (this thread is UI thread, and io_thread_ is for IPCs).
1001   io_thread_->SetPriority(base::kThreadPriority_Display);
1002   base::PlatformThread::SetThreadPriority(
1003       base::PlatformThread::CurrentHandle(),
1004       base::kThreadPriority_Display);
1005 #endif
1006
1007 #if !defined(OS_IOS)
1008   HistogramSynchronizer::GetInstance();
1009
1010   bool initialize_gpu_data_manager = true;
1011 #if defined(OS_ANDROID)
1012   // On Android, GLSurface::InitializeOneOff() must be called before initalizing
1013   // the GpuDataManagerImpl as it uses the GL bindings. crbug.com/326295
1014   if (!gfx::GLSurface::InitializeOneOff()) {
1015     LOG(ERROR) << "GLSurface::InitializeOneOff failed";
1016     initialize_gpu_data_manager = false;
1017   }
1018 #endif
1019
1020   // Initialize the GpuDataManager before we set up the MessageLoops because
1021   // otherwise we'll trigger the assertion about doing IO on the UI thread.
1022   if (initialize_gpu_data_manager)
1023     GpuDataManagerImpl::GetInstance()->Initialize();
1024
1025   bool always_uses_gpu = true;
1026   bool established_gpu_channel = false;
1027 #if defined(USE_AURA) || defined(OS_MACOSX)
1028   established_gpu_channel = true;
1029   if (!GpuDataManagerImpl::GetInstance()->CanUseGpuBrowserCompositor()) {
1030     established_gpu_channel = always_uses_gpu = false;
1031   }
1032   BrowserGpuChannelHostFactory::Initialize(established_gpu_channel);
1033   ImageTransportFactory::Initialize();
1034 #if defined(USE_AURA)
1035   if (aura::Env::GetInstance()) {
1036     aura::Env::GetInstance()->set_context_factory(GetContextFactory());
1037   }
1038 #endif
1039 #elif defined(OS_ANDROID)
1040   // TODO(crbug.com/439322): This should be set to |true|.
1041   established_gpu_channel = false;
1042   BrowserGpuChannelHostFactory::Initialize(established_gpu_channel);
1043 #endif
1044
1045 #if defined(OS_LINUX) && defined(USE_UDEV)
1046   device_monitor_linux_.reset(new DeviceMonitorLinux());
1047 #elif defined(OS_MACOSX)
1048   device_monitor_mac_.reset(new DeviceMonitorMac());
1049 #endif
1050
1051   // RDH needs the IO thread to be created
1052   {
1053     TRACE_EVENT0("startup",
1054       "BrowserMainLoop::BrowserThreadsStarted:InitResourceDispatcherHost");
1055     resource_dispatcher_host_.reset(new ResourceDispatcherHostImpl());
1056   }
1057
1058   // MediaStreamManager needs the IO thread to be created.
1059   {
1060     TRACE_EVENT0("startup",
1061       "BrowserMainLoop::BrowserThreadsStarted:InitMediaStreamManager");
1062     media_stream_manager_.reset(new MediaStreamManager(audio_manager_.get()));
1063   }
1064
1065   {
1066     TRACE_EVENT0("startup",
1067       "BrowserMainLoop::BrowserThreadsStarted:InitSpeechRecognition");
1068     speech_recognition_manager_.reset(new SpeechRecognitionManagerImpl(
1069         audio_manager_.get(), media_stream_manager_.get()));
1070   }
1071
1072   {
1073     TRACE_EVENT0(
1074         "startup",
1075         "BrowserMainLoop::BrowserThreadsStarted::InitUserInputMonitor");
1076     user_input_monitor_ = media::UserInputMonitor::Create(
1077         io_thread_->message_loop_proxy(), main_thread_->message_loop_proxy());
1078   }
1079
1080   {
1081     TRACE_EVENT0("startup",
1082                  "BrowserMainLoop::BrowserThreadsStarted::TimeZoneMonitor");
1083     time_zone_monitor_ = TimeZoneMonitor::Create();
1084   }
1085
1086   // Alert the clipboard class to which threads are allowed to access the
1087   // clipboard:
1088   std::vector<base::PlatformThreadId> allowed_clipboard_threads;
1089   // The current thread is the UI thread.
1090   allowed_clipboard_threads.push_back(base::PlatformThread::CurrentId());
1091 #if defined(OS_WIN)
1092   // On Windows, clipboards are also used on the File or IO threads.
1093   allowed_clipboard_threads.push_back(file_thread_->thread_id());
1094   allowed_clipboard_threads.push_back(io_thread_->thread_id());
1095 #endif
1096   ui::Clipboard::SetAllowedThreads(allowed_clipboard_threads);
1097
1098   // When running the GPU thread in-process, avoid optimistically starting it
1099   // since creating the GPU thread races against creation of the one-and-only
1100   // ChildProcess instance which is created by the renderer thread.
1101   if (GpuDataManagerImpl::GetInstance()->GpuAccessAllowed(NULL) &&
1102       !established_gpu_channel &&
1103       always_uses_gpu &&
1104       !parsed_command_line_.HasSwitch(switches::kSingleProcess) &&
1105       !parsed_command_line_.HasSwitch(switches::kInProcessGPU)) {
1106     TRACE_EVENT_INSTANT0("gpu", "Post task to launch GPU process",
1107                          TRACE_EVENT_SCOPE_THREAD);
1108     BrowserThread::PostTask(
1109         BrowserThread::IO, FROM_HERE, base::Bind(
1110             base::IgnoreResult(&GpuProcessHost::Get),
1111             GpuProcessHost::GPU_PROCESS_KIND_SANDBOXED,
1112             CAUSE_FOR_GPU_LAUNCH_BROWSER_STARTUP));
1113   }
1114
1115 #if defined(OS_MACOSX)
1116   ThemeHelperMac::GetInstance();
1117   SystemHotkeyHelperMac::GetInstance()->DeferredLoadSystemHotkeys();
1118   if (ShouldEnableBootstrapSandbox()) {
1119     TRACE_EVENT0("startup",
1120         "BrowserMainLoop::BrowserThreadsStarted:BootstrapSandbox");
1121     CHECK(GetBootstrapSandbox());
1122   }
1123 #endif  // defined(OS_MACOSX)
1124
1125 #endif  // !defined(OS_IOS)
1126
1127   return result_code_;
1128 }
1129
1130 bool BrowserMainLoop::InitializeToolkit() {
1131   TRACE_EVENT0("startup", "BrowserMainLoop::InitializeToolkit");
1132   // TODO(evan): this function is rather subtle, due to the variety
1133   // of intersecting ifdefs we have.  To keep it easy to follow, there
1134   // are no #else branches on any #ifs.
1135   // TODO(stevenjb): Move platform specific code into platform specific Parts
1136   // (Need to add InitializeToolkit stage to BrowserParts).
1137   // See also GTK setup in EarlyInitialization, above, and associated comments.
1138
1139 #if defined(OS_WIN)
1140   // Init common control sex.
1141   INITCOMMONCONTROLSEX config;
1142   config.dwSize = sizeof(config);
1143   config.dwICC = ICC_WIN95_CLASSES;
1144   if (!InitCommonControlsEx(&config))
1145     PLOG(FATAL);
1146 #endif
1147
1148 #if defined(USE_AURA)
1149
1150 #if defined(USE_X11)
1151   if (!gfx::GetXDisplay())
1152     return false;
1153 #endif
1154
1155   // Env creates the compositor. Aura widgets need the compositor to be created
1156   // before they can be initialized by the browser.
1157   aura::Env::CreateInstance(true);
1158 #endif  // defined(USE_AURA)
1159
1160   if (parts_)
1161     parts_->ToolkitInitialized();
1162
1163   return true;
1164 }
1165
1166 void BrowserMainLoop::MainMessageLoopRun() {
1167 #if defined(OS_ANDROID)
1168   // Android's main message loop is the Java message loop.
1169   NOTREACHED();
1170 #else
1171   DCHECK(base::MessageLoopForUI::IsCurrent());
1172   if (parameters_.ui_task)
1173     base::MessageLoopForUI::current()->PostTask(FROM_HERE,
1174                                                 *parameters_.ui_task);
1175
1176   base::RunLoop run_loop;
1177   run_loop.Run();
1178 #endif
1179 }
1180
1181 base::FilePath BrowserMainLoop::GetStartupTraceFileName(
1182     const base::CommandLine& command_line) const {
1183   base::FilePath trace_file = command_line.GetSwitchValuePath(
1184       switches::kTraceStartupFile);
1185   // trace_file = "none" means that startup events will show up for the next
1186   // begin/end tracing (via about:tracing or AutomationProxy::BeginTracing/
1187   // EndTracing, for example).
1188   if (trace_file == base::FilePath().AppendASCII("none"))
1189     return trace_file;
1190
1191   if (trace_file.empty()) {
1192 #if defined(OS_ANDROID)
1193     TracingControllerAndroid::GenerateTracingFilePath(&trace_file);
1194 #else
1195     // Default to saving the startup trace into the current dir.
1196     trace_file = base::FilePath().AppendASCII("chrometrace.log");
1197 #endif
1198   }
1199
1200   return trace_file;
1201 }
1202
1203 void BrowserMainLoop::InitStartupTracing(
1204     const base::CommandLine& command_line) {
1205   DCHECK(is_tracing_startup_);
1206
1207   startup_trace_file_ = GetStartupTraceFileName(parsed_command_line_);
1208
1209   std::string delay_str = command_line.GetSwitchValueASCII(
1210       switches::kTraceStartupDuration);
1211   int delay_secs = 5;
1212   if (!delay_str.empty() && !base::StringToInt(delay_str, &delay_secs)) {
1213     DLOG(WARNING) << "Could not parse --" << switches::kTraceStartupDuration
1214         << "=" << delay_str << " defaulting to 5 (secs)";
1215     delay_secs = 5;
1216   }
1217
1218   startup_trace_timer_.Start(FROM_HERE,
1219                              base::TimeDelta::FromSeconds(delay_secs),
1220                              this,
1221                              &BrowserMainLoop::EndStartupTracing);
1222 }
1223
1224 void BrowserMainLoop::EndStartupTracing() {
1225   is_tracing_startup_ = false;
1226   TracingController::GetInstance()->DisableRecording(
1227       TracingController::CreateFileSink(
1228           startup_trace_file_,
1229           base::Bind(OnStoppedStartupTracing, startup_trace_file_)));
1230 }
1231
1232 }  // namespace content