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(OS_CHROMEOS)
 104 #include "base/chromeos/memory_pressure_observer_chromeos.h"
 105 #include "chromeos/chromeos_switches.h"
 106 #endif
 107
 108 #if defined(USE_GLIB)
 109 #include <glib-object.h>
 110 #endif
 111
 112 #if defined(OS_LINUX) && defined(USE_UDEV)
 113 #include "content/browser/device_monitor_udev.h"
 114 #elif defined(OS_MACOSX) && !defined(OS_IOS)
 115 #include "content/browser/device_monitor_mac.h"
 116 #endif
 117
 118 #if defined(OS_POSIX) && !defined(OS_MACOSX)
 119 #include "content/browser/renderer_host/render_sandbox_host_linux.h"
 120 #include "content/browser/zygote_host/zygote_host_impl_linux.h"
 121 #include "sandbox/linux/suid/client/setuid_sandbox_client.h"
 122 #endif
 123
 124 #if defined(ENABLE_PLUGINS)
 125 #include "content/browser/plugin_service_impl.h"
 126 #endif
 127
 128 #if defined(TCMALLOC_TRACE_MEMORY_SUPPORTED)
 129 #include "third_party/tcmalloc/chromium/src/gperftools/heap-profiler.h"
 130 #endif
 131
 132 #if defined(USE_X11)
 133 #include "ui/gfx/x/x11_connection.h"
 134 #include "ui/gfx/x/x11_types.h"
 135 #endif
 136
 137 // One of the linux specific headers defines this as a macro.
 138 #ifdef DestroyAll
 139 #undef DestroyAll
 140 #endif
 141
 142 namespace content {
 143 namespace {
 144
 145 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 146 void SetupSandbox(const base::CommandLine& parsed_command_line) {
 147   TRACE_EVENT0("startup", "SetupSandbox");
 148   base::FilePath sandbox_binary;
 149
 150   scoped_ptr<sandbox::SetuidSandboxClient> setuid_sandbox_client(
 151       sandbox::SetuidSandboxClient::Create());
 152
 153   const bool want_setuid_sandbox =
 154       !parsed_command_line.HasSwitch(switches::kNoSandbox) &&
 155       !parsed_command_line.HasSwitch(switches::kDisableSetuidSandbox) &&
 156       !setuid_sandbox_client->IsDisabledViaEnvironment();
 157
 158   static const char no_suid_error[] =
 159       "Running without the SUID sandbox! See "
 160       "https://code.google.com/p/chromium/wiki/LinuxSUIDSandboxDevelopment "
 161       "for more information on developing with the sandbox on.";
 162   if (want_setuid_sandbox) {
 163     sandbox_binary = setuid_sandbox_client->GetSandboxBinaryPath();
 164     if (sandbox_binary.empty()) {
 165       // This needs to be fatal. Talk to security@chromium.org if you feel
 166       // otherwise.
 167       LOG(FATAL) << no_suid_error;
 168     }
 169   } else {
 170     LOG(ERROR) << no_suid_error;
 171   }
 172
 173   // Tickle the sandbox host and zygote host so they fork now.
 174   RenderSandboxHostLinux::GetInstance()->Init();
 175   ZygoteHostImpl::GetInstance()->Init(sandbox_binary.value());
 176 }
 177 #endif
 178
 179 #if defined(USE_GLIB)
 180 static void GLibLogHandler(const gchar* log_domain,
 181                            GLogLevelFlags log_level,
 182                            const gchar* message,
 183                            gpointer userdata) {
 184   if (!log_domain)
 185     log_domain = "<unknown>";
 186   if (!message)
 187     message = "<no message>";
 188
 189   if (strstr(message, "Unable to retrieve the file info for")) {
 190     LOG(ERROR) << "GTK File code error: " << message;
 191   } else if (strstr(message, "Could not find the icon") &&
 192              strstr(log_domain, "Gtk")) {
 193     LOG(ERROR) << "GTK icon error: " << message;
 194   } else if (strstr(message, "Theme file for default has no") ||
 195              strstr(message, "Theme directory") ||
 196              strstr(message, "theme pixmap") ||
 197              strstr(message, "locate theme engine")) {
 198     LOG(ERROR) << "GTK theme error: " << message;
 199   } else if (strstr(message, "Unable to create Ubuntu Menu Proxy") &&
 200              strstr(log_domain, "<unknown>")) {
 201     LOG(ERROR) << "GTK menu proxy create failed";
 202   } else if (strstr(message, "Out of memory") &&
 203              strstr(log_domain, "<unknown>")) {
 204     LOG(ERROR) << "DBus call timeout or out of memory: "
 205                << "http://crosbug.com/15496";
 206   } else if (strstr(message, "Could not connect: Connection refused") &&
 207              strstr(log_domain, "<unknown>")) {
 208     LOG(ERROR) << "DConf settings backend could not connect to session bus: "
 209                << "http://crbug.com/179797";
 210   } else if (strstr(message, "Attempting to store changes into") ||
 211              strstr(message, "Attempting to set the permissions of")) {
 212     LOG(ERROR) << message << " (http://bugs.chromium.org/161366)";
 213   } else if (strstr(message, "drawable is not a native X11 window")) {
 214     LOG(ERROR) << message << " (http://bugs.chromium.org/329991)";
 215   } else {
 216     LOG(DFATAL) << log_domain << ": " << message;
 217   }
 218 }
 219
 220 static void SetUpGLibLogHandler() {
 221   // Register GLib-handled assertions to go through our logging system.
 222   const char* kLogDomains[] = { NULL, "Gtk", "Gdk", "GLib", "GLib-GObject" };
 223   for (size_t i = 0; i < arraysize(kLogDomains); i++) {
 224     g_log_set_handler(kLogDomains[i],
 225                       static_cast<GLogLevelFlags>(G_LOG_FLAG_RECURSION |
 226                                                   G_LOG_FLAG_FATAL |
 227                                                   G_LOG_LEVEL_ERROR |
 228                                                   G_LOG_LEVEL_CRITICAL |
 229                                                   G_LOG_LEVEL_WARNING),
 230                       GLibLogHandler,
 231                       NULL);
 232   }
 233 }
 234 #endif
 235
 236 void OnStoppedStartupTracing(const base::FilePath& trace_file) {
 237   VLOG(0) << "Completed startup tracing to " << trace_file.value();
 238 }
 239
 240 // Disable optimizations for this block of functions so the compiler doesn't
 241 // merge them all together. This makes it possible to tell what thread was
 242 // unresponsive by inspecting the callstack.
 243 MSVC_DISABLE_OPTIMIZE()
 244 MSVC_PUSH_DISABLE_WARNING(4748)
 245
 246 NOINLINE void ResetThread_DB(scoped_ptr<BrowserProcessSubThread> thread) {
 247   volatile int inhibit_comdat = __LINE__;
 248   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 249   thread.reset();
 250 }
 251
 252 NOINLINE void ResetThread_FILE(scoped_ptr<BrowserProcessSubThread> thread) {
 253   volatile int inhibit_comdat = __LINE__;
 254   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 255   thread.reset();
 256 }
 257
 258 NOINLINE void ResetThread_FILE_USER_BLOCKING(
 259     scoped_ptr<BrowserProcessSubThread> thread) {
 260   volatile int inhibit_comdat = __LINE__;
 261   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 262   thread.reset();
 263 }
 264
 265 NOINLINE void ResetThread_PROCESS_LAUNCHER(
 266     scoped_ptr<BrowserProcessSubThread> thread) {
 267   volatile int inhibit_comdat = __LINE__;
 268   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 269   thread.reset();
 270 }
 271
 272 NOINLINE void ResetThread_CACHE(scoped_ptr<BrowserProcessSubThread> thread) {
 273   volatile int inhibit_comdat = __LINE__;
 274   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 275   thread.reset();
 276 }
 277
 278 NOINLINE void ResetThread_IO(scoped_ptr<BrowserProcessSubThread> thread) {
 279   volatile int inhibit_comdat = __LINE__;
 280   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 281   thread.reset();
 282 }
 283
 284 #if !defined(OS_IOS)
 285 NOINLINE void ResetThread_IndexedDb(scoped_ptr<base::Thread> thread) {
 286   volatile int inhibit_comdat = __LINE__;
 287   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 288   thread.reset();
 289 }
 290 #endif
 291
 292 MSVC_POP_WARNING()
 293 MSVC_ENABLE_OPTIMIZE();
 294
 295 }  // namespace
 296
 297 // The currently-running BrowserMainLoop.  There can be one or zero.
 298 BrowserMainLoop* g_current_browser_main_loop = NULL;
 299
 300 // This is just to be able to keep ShutdownThreadsAndCleanUp out of
 301 // the public interface of BrowserMainLoop.
 302 class BrowserShutdownImpl {
 303  public:
 304   static void ImmediateShutdownAndExitProcess() {
 305     DCHECK(g_current_browser_main_loop);
 306     g_current_browser_main_loop->ShutdownThreadsAndCleanUp();
 307
 308 #if defined(OS_WIN)
 309     // At this point the message loop is still running yet we've shut everything
 310     // down. If any messages are processed we'll likely crash. Exit now.
 311     ExitProcess(RESULT_CODE_NORMAL_EXIT);
 312 #elif defined(OS_POSIX) && !defined(OS_MACOSX)
 313     _exit(RESULT_CODE_NORMAL_EXIT);
 314 #else
 315     NOTIMPLEMENTED();
 316 #endif
 317   }
 318 };
 319
 320 void ImmediateShutdownAndExitProcess() {
 321   BrowserShutdownImpl::ImmediateShutdownAndExitProcess();
 322 }
 323
 324 // For measuring memory usage after each task. Behind a command line flag.
 325 class BrowserMainLoop::MemoryObserver : public base::MessageLoop::TaskObserver {
 326  public:
 327   MemoryObserver() {}
 328   ~MemoryObserver() override {}
 329
 330   void WillProcessTask(const base::PendingTask& pending_task) override {}
 331
 332   void DidProcessTask(const base::PendingTask& pending_task) override {
 333 #if !defined(OS_IOS)  // No ProcessMetrics on IOS.
 334     scoped_ptr<base::ProcessMetrics> process_metrics(
 335         base::ProcessMetrics::CreateProcessMetrics(
 336 #if defined(OS_MACOSX)
 337             base::GetCurrentProcessHandle(), NULL));
 338 #else
 339             base::GetCurrentProcessHandle()));
 340 #endif
 341     size_t private_bytes;
 342     process_metrics->GetMemoryBytes(&private_bytes, NULL);
 343     LOCAL_HISTOGRAM_MEMORY_KB("Memory.BrowserUsed", private_bytes >> 10);
 344 #endif
 345   }
 346  private:
 347   DISALLOW_COPY_AND_ASSIGN(MemoryObserver);
 348 };
 349
 350
 351 // BrowserMainLoop construction / destruction =============================
 352
 353 BrowserMainLoop* BrowserMainLoop::GetInstance() {
 354   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 355   return g_current_browser_main_loop;
 356 }
 357
 358 BrowserMainLoop::BrowserMainLoop(const MainFunctionParams& parameters)
 359     : parameters_(parameters),
 360       parsed_command_line_(parameters.command_line),
 361       result_code_(RESULT_CODE_NORMAL_EXIT),
 362       created_threads_(false),
 363       // ContentMainRunner should have enabled tracing of the browser process
 364       // when kTraceStartup is in the command line.
 365       is_tracing_startup_(
 366           parameters.command_line.HasSwitch(switches::kTraceStartup)) {
 367   DCHECK(!g_current_browser_main_loop);
 368   g_current_browser_main_loop = this;
 369 }
 370
 371 BrowserMainLoop::~BrowserMainLoop() {
 372   DCHECK_EQ(this, g_current_browser_main_loop);
 373 #if !defined(OS_IOS)
 374   ui::Clipboard::DestroyClipboardForCurrentThread();
 375 #endif  // !defined(OS_IOS)
 376   g_current_browser_main_loop = NULL;
 377 }
 378
 379 void BrowserMainLoop::Init() {
 380   TRACE_EVENT0("startup", "BrowserMainLoop::Init");
 381   parts_.reset(
 382       GetContentClient()->browser()->CreateBrowserMainParts(parameters_));
 383 }
 384
 385 // BrowserMainLoop stages ==================================================
 386
 387 void BrowserMainLoop::EarlyInitialization() {
 388   TRACE_EVENT0("startup", "BrowserMainLoop::EarlyInitialization");
 389
 390 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 391   // No thread should be created before this call, as SetupSandbox()
 392   // will end-up using fork().
 393   SetupSandbox(parsed_command_line_);
 394 #endif
 395
 396 #if defined(USE_X11)
 397   if (parsed_command_line_.HasSwitch(switches::kSingleProcess) ||
 398       parsed_command_line_.HasSwitch(switches::kInProcessGPU)) {
 399     if (!gfx::InitializeThreadedX11()) {
 400       LOG(ERROR) << "Failed to put Xlib into threaded mode.";
 401     }
 402   }
 403 #endif
 404
 405   // GLib's spawning of new processes is buggy, so it's important that at this
 406   // point GLib does not need to start DBUS. Chrome should always start with
 407   // DBUS_SESSION_BUS_ADDRESS properly set. See crbug.com/309093.
 408 #if defined(USE_GLIB)
 409   // g_type_init will be deprecated in 2.36. 2.35 is the development
 410   // version for 2.36, hence do not call g_type_init starting 2.35.
 411   // http://developer.gnome.org/gobject/unstable/gobject-Type-Information.html#g-type-init
 412 #if !GLIB_CHECK_VERSION(2, 35, 0)
 413   // GLib type system initialization. Needed at least for gconf,
 414   // used in net/proxy/proxy_config_service_linux.cc. Most likely
 415   // this is superfluous as gtk_init() ought to do this. It's
 416   // definitely harmless, so retained as a reminder of this
 417   // requirement for gconf.
 418   g_type_init();
 419 #endif
 420
 421   SetUpGLibLogHandler();
 422 #endif
 423
 424   if (parts_)
 425     parts_->PreEarlyInitialization();
 426
 427 #if defined(OS_MACOSX)
 428   // We use quite a few file descriptors for our IPC, and the default limit on
 429   // the Mac is low (256), so bump it up.
 430   base::SetFdLimit(1024);
 431 #endif
 432
 433 #if defined(OS_WIN)
 434   net::EnsureWinsockInit();
 435 #endif
 436
 437 #if !defined(USE_OPENSSL)
 438   // We want to be sure to init NSPR on the main thread.
 439   crypto::EnsureNSPRInit();
 440 #endif  // !defined(USE_OPENSSL)
 441
 442 #if !defined(OS_IOS)
 443   if (parsed_command_line_.HasSwitch(switches::kRendererProcessLimit)) {
 444     std::string limit_string = parsed_command_line_.GetSwitchValueASCII(
 445         switches::kRendererProcessLimit);
 446     size_t process_limit;
 447     if (base::StringToSizeT(limit_string, &process_limit)) {
 448       RenderProcessHost::SetMaxRendererProcessCount(process_limit);
 449     }
 450   }
 451 #endif  // !defined(OS_IOS)
 452
 453   if (parsed_command_line_.HasSwitch(switches::kEnableNativeGpuMemoryBuffers)) {
 454     BrowserGpuChannelHostFactory::EnableGpuMemoryBufferFactoryUsage(
 455         gfx::GpuMemoryBuffer::MAP);
 456   }
 457
 458 #if defined(USE_OZONE)
 459   BrowserGpuChannelHostFactory::EnableGpuMemoryBufferFactoryUsage(
 460       gfx::GpuMemoryBuffer::SCANOUT);
 461 #endif
 462
 463   if (parts_)
 464     parts_->PostEarlyInitialization();
 465 }
 466
 467 void BrowserMainLoop::MainMessageLoopStart() {
 468   TRACE_EVENT0("startup", "BrowserMainLoop::MainMessageLoopStart");
 469   if (parts_) {
 470     TRACE_EVENT0("startup",
 471         "BrowserMainLoop::MainMessageLoopStart:PreMainMessageLoopStart");
 472     parts_->PreMainMessageLoopStart();
 473   }
 474
 475 #if defined(OS_WIN)
 476   // If we're running tests (ui_task is non-null), then the ResourceBundle
 477   // has already been initialized.
 478   if (!parameters_.ui_task) {
 479     // Override the configured locale with the user's preferred UI language.
 480     l10n_util::OverrideLocaleWithUILanguageList();
 481   }
 482 #endif
 483
 484   // Create a MessageLoop if one does not already exist for the current thread.
 485   if (!base::MessageLoop::current())
 486     main_message_loop_.reset(new base::MessageLoopForUI);
 487
 488   InitializeMainThread();
 489
 490 #if defined(OS_CHROMEOS)
 491   if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
 492           chromeos::switches::kDisableMemoryPressureSystemChromeOS)) {
 493     memory_pressure_observer_.reset(new base::MemoryPressureObserverChromeOS(
 494         chromeos::switches::GetMemoryPressureThresholds()));
 495   }
 496 #endif
 497
 498   {
 499     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:SystemMonitor");
 500     system_monitor_.reset(new base::SystemMonitor);
 501   }
 502   {
 503     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:PowerMonitor");
 504     scoped_ptr<base::PowerMonitorSource> power_monitor_source(
 505       new base::PowerMonitorDeviceSource());
 506     power_monitor_.reset(new base::PowerMonitor(power_monitor_source.Pass()));
 507   }
 508   {
 509     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:HighResTimerManager");
 510     hi_res_timer_manager_.reset(new base::HighResolutionTimerManager);
 511   }
 512   {
 513     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:NetworkChangeNotifier");
 514     network_change_notifier_.reset(net::NetworkChangeNotifier::Create());
 515   }
 516
 517 #if !defined(OS_IOS)
 518   {
 519     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:MediaFeatures");
 520     media::InitializeCPUSpecificMediaFeatures();
 521   }
 522   {
 523     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:AudioMan");
 524     audio_manager_.reset(media::AudioManager::Create(
 525         MediaInternals::GetInstance()));
 526   }
 527   {
 528     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:MidiManager");
 529     midi_manager_.reset(media::MidiManager::Create());
 530   }
 531   {
 532     TRACE_EVENT0("startup",
 533                  "BrowserMainLoop::Subsystem:ContentWebUIController");
 534     WebUIControllerFactory::RegisterFactory(
 535         ContentWebUIControllerFactory::GetInstance());
 536   }
 537
 538   {
 539     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:OnlineStateObserver");
 540     online_state_observer_.reset(new BrowserOnlineStateObserver);
 541   }
 542
 543   {
 544     system_stats_monitor_.reset(new base::debug::TraceEventSystemStatsMonitor(
 545         base::ThreadTaskRunnerHandle::Get()));
 546   }
 547 #endif  // !defined(OS_IOS)
 548
 549 #if defined(OS_WIN)
 550   system_message_window_.reset(new SystemMessageWindowWin);
 551 #endif
 552
 553   if (parts_)
 554     parts_->PostMainMessageLoopStart();
 555
 556 #if !defined(OS_IOS)
 557   // Start tracing to a file if needed. Only do this after starting the main
 558   // message loop to avoid calling MessagePumpForUI::ScheduleWork() before
 559   // MessagePumpForUI::Start() as it will crash the browser.
 560   if (is_tracing_startup_) {
 561     TRACE_EVENT0("startup", "BrowserMainLoop::InitStartupTracing");
 562     InitStartupTracing(parsed_command_line_);
 563   }
 564 #endif  // !defined(OS_IOS)
 565
 566 #if defined(OS_ANDROID)
 567   {
 568     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:SurfaceTextureManager");
 569     SurfaceTextureManager::InitInstance(new BrowserSurfaceTextureManager);
 570   }
 571
 572   {
 573     TRACE_EVENT0("startup",
 574                  "BrowserMainLoop::Subsystem:ScreenOrientationProvider");
 575     screen_orientation_delegate_.reset(
 576         new ScreenOrientationDelegateAndroid());
 577     ScreenOrientationProvider::SetDelegate(screen_orientation_delegate_.get());
 578   }
 579 #endif
 580
 581   if (parsed_command_line_.HasSwitch(switches::kMemoryMetrics)) {
 582     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:MemoryObserver");
 583     memory_observer_.reset(new MemoryObserver());
 584     base::MessageLoop::current()->AddTaskObserver(memory_observer_.get());
 585   }
 586
 587 #if defined(TCMALLOC_TRACE_MEMORY_SUPPORTED)
 588   trace_memory_controller_.reset(new base::debug::TraceMemoryController(
 589       base::MessageLoop::current()->message_loop_proxy(),
 590       ::HeapProfilerWithPseudoStackStart,
 591       ::HeapProfilerStop,
 592       ::GetHeapProfile));
 593 #endif
 594 }
 595
 596 int BrowserMainLoop::PreCreateThreads() {
 597   if (parts_) {
 598     TRACE_EVENT0("startup",
 599         "BrowserMainLoop::CreateThreads:PreCreateThreads");
 600     result_code_ = parts_->PreCreateThreads();
 601   }
 602
 603 #if defined(ENABLE_PLUGINS)
 604   // Prior to any processing happening on the io thread, we create the
 605   // plugin service as it is predominantly used from the io thread,
 606   // but must be created on the main thread. The service ctor is
 607   // inexpensive and does not invoke the io_thread() accessor.
 608   {
 609     TRACE_EVENT0("startup", "BrowserMainLoop::CreateThreads:PluginService");
 610     PluginService::GetInstance()->Init();
 611   }
 612 #endif
 613
 614 #if !defined(OS_IOS) && (!defined(GOOGLE_CHROME_BUILD) || defined(OS_ANDROID))
 615   // Single-process is an unsupported and not fully tested mode, so
 616   // don't enable it for official Chrome builds (except on Android).
 617   if (parsed_command_line_.HasSwitch(switches::kSingleProcess))
 618     RenderProcessHost::SetRunRendererInProcess(true);
 619 #endif
 620   return result_code_;
 621 }
 622
 623 void BrowserMainLoop::CreateStartupTasks() {
 624   TRACE_EVENT0("startup", "BrowserMainLoop::CreateStartupTasks");
 625
 626   // First time through, we really want to create all the tasks
 627   if (!startup_task_runner_.get()) {
 628 #if defined(OS_ANDROID)
 629     startup_task_runner_ = make_scoped_ptr(new StartupTaskRunner(
 630         base::Bind(&BrowserStartupComplete),
 631         base::MessageLoop::current()->message_loop_proxy()));
 632 #else
 633     startup_task_runner_ = make_scoped_ptr(new StartupTaskRunner(
 634         base::Callback<void(int)>(),
 635         base::MessageLoop::current()->message_loop_proxy()));
 636 #endif
 637     StartupTask pre_create_threads =
 638         base::Bind(&BrowserMainLoop::PreCreateThreads, base::Unretained(this));
 639     startup_task_runner_->AddTask(pre_create_threads);
 640
 641     StartupTask create_threads =
 642         base::Bind(&BrowserMainLoop::CreateThreads, base::Unretained(this));
 643     startup_task_runner_->AddTask(create_threads);
 644
 645     StartupTask browser_thread_started = base::Bind(
 646         &BrowserMainLoop::BrowserThreadsStarted, base::Unretained(this));
 647     startup_task_runner_->AddTask(browser_thread_started);
 648
 649     StartupTask pre_main_message_loop_run = base::Bind(
 650         &BrowserMainLoop::PreMainMessageLoopRun, base::Unretained(this));
 651     startup_task_runner_->AddTask(pre_main_message_loop_run);
 652
 653 #if defined(OS_ANDROID)
 654     if (BrowserMayStartAsynchronously()) {
 655       startup_task_runner_->StartRunningTasksAsync();
 656     }
 657 #endif
 658   }
 659 #if defined(OS_ANDROID)
 660   if (!BrowserMayStartAsynchronously()) {
 661     // A second request for asynchronous startup can be ignored, so
 662     // StartupRunningTasksAsync is only called first time through. If, however,
 663     // this is a request for synchronous startup then it must override any
 664     // previous call for async startup, so we call RunAllTasksNow()
 665     // unconditionally.
 666     startup_task_runner_->RunAllTasksNow();
 667   }
 668 #else
 669   startup_task_runner_->RunAllTasksNow();
 670 #endif
 671 }
 672
 673 int BrowserMainLoop::CreateThreads() {
 674   TRACE_EVENT0("startup", "BrowserMainLoop::CreateThreads");
 675
 676   base::Thread::Options io_message_loop_options;
 677   io_message_loop_options.message_loop_type = base::MessageLoop::TYPE_IO;
 678   base::Thread::Options ui_message_loop_options;
 679   ui_message_loop_options.message_loop_type = base::MessageLoop::TYPE_UI;
 680
 681   // Start threads in the order they occur in the BrowserThread::ID
 682   // enumeration, except for BrowserThread::UI which is the main
 683   // thread.
 684   //
 685   // Must be size_t so we can increment it.
 686   for (size_t thread_id = BrowserThread::UI + 1;
 687        thread_id < BrowserThread::ID_COUNT;
 688        ++thread_id) {
 689     scoped_ptr<BrowserProcessSubThread>* thread_to_start = NULL;
 690     base::Thread::Options options;
 691
 692     switch (thread_id) {
 693       case BrowserThread::DB:
 694         TRACE_EVENT_BEGIN1("startup",
 695             "BrowserMainLoop::CreateThreads:start",
 696             "Thread", "BrowserThread::DB");
 697         thread_to_start = &db_thread_;
 698         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 699         break;
 700       case BrowserThread::FILE_USER_BLOCKING:
 701         TRACE_EVENT_BEGIN1("startup",
 702             "BrowserMainLoop::CreateThreads:start",
 703             "Thread", "BrowserThread::FILE_USER_BLOCKING");
 704         thread_to_start = &file_user_blocking_thread_;
 705         break;
 706       case BrowserThread::FILE:
 707         TRACE_EVENT_BEGIN1("startup",
 708             "BrowserMainLoop::CreateThreads:start",
 709             "Thread", "BrowserThread::FILE");
 710         thread_to_start = &file_thread_;
 711 #if defined(OS_WIN)
 712         // On Windows, the FILE thread needs to be have a UI message loop
 713         // which pumps messages in such a way that Google Update can
 714         // communicate back to us.
 715         options = ui_message_loop_options;
 716 #else
 717         options = io_message_loop_options;
 718 #endif
 719         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 720         break;
 721       case BrowserThread::PROCESS_LAUNCHER:
 722         TRACE_EVENT_BEGIN1("startup",
 723             "BrowserMainLoop::CreateThreads:start",
 724             "Thread", "BrowserThread::PROCESS_LAUNCHER");
 725         thread_to_start = &process_launcher_thread_;
 726         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 727         break;
 728       case BrowserThread::CACHE:
 729         TRACE_EVENT_BEGIN1("startup",
 730             "BrowserMainLoop::CreateThreads:start",
 731             "Thread", "BrowserThread::CACHE");
 732         thread_to_start = &cache_thread_;
 733         options = io_message_loop_options;
 734         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 735         break;
 736       case BrowserThread::IO:
 737         TRACE_EVENT_BEGIN1("startup",
 738             "BrowserMainLoop::CreateThreads:start",
 739             "Thread", "BrowserThread::IO");
 740         thread_to_start = &io_thread_;
 741         options = io_message_loop_options;
 742         break;
 743       case BrowserThread::UI:
 744       case BrowserThread::ID_COUNT:
 745       default:
 746         NOTREACHED();
 747         break;
 748     }
 749
 750     BrowserThread::ID id = static_cast<BrowserThread::ID>(thread_id);
 751
 752     if (thread_to_start) {
 753       (*thread_to_start).reset(new BrowserProcessSubThread(id));
 754       if (!(*thread_to_start)->StartWithOptions(options)) {
 755         LOG(FATAL) << "Failed to start the browser thread: id == " << id;
 756       }
 757     } else {
 758       NOTREACHED();
 759     }
 760
 761     TRACE_EVENT_END0("startup", "BrowserMainLoop::CreateThreads:start");
 762   }
 763   created_threads_ = true;
 764   return result_code_;
 765 }
 766
 767 int BrowserMainLoop::PreMainMessageLoopRun() {
 768   if (parts_) {
 769     TRACE_EVENT0("startup",
 770         "BrowserMainLoop::CreateThreads:PreMainMessageLoopRun");
 771     parts_->PreMainMessageLoopRun();
 772   }
 773
 774   // If the UI thread blocks, the whole UI is unresponsive.
 775   // Do not allow disk IO from the UI thread.
 776   base::ThreadRestrictions::SetIOAllowed(false);
 777   base::ThreadRestrictions::DisallowWaiting();
 778   return result_code_;
 779 }
 780
 781 void BrowserMainLoop::RunMainMessageLoopParts() {
 782   TRACE_EVENT_BEGIN_ETW("BrowserMain:MESSAGE_LOOP", 0, "");
 783
 784   bool ran_main_loop = false;
 785   if (parts_)
 786     ran_main_loop = parts_->MainMessageLoopRun(&result_code_);
 787
 788   if (!ran_main_loop)
 789     MainMessageLoopRun();
 790
 791   TRACE_EVENT_END_ETW("BrowserMain:MESSAGE_LOOP", 0, "");
 792 }
 793
 794 void BrowserMainLoop::ShutdownThreadsAndCleanUp() {
 795   if (!created_threads_) {
 796     // Called early, nothing to do
 797     return;
 798   }
 799   TRACE_EVENT0("shutdown", "BrowserMainLoop::ShutdownThreadsAndCleanUp");
 800
 801   // Teardown may start in PostMainMessageLoopRun, and during teardown we
 802   // need to be able to perform IO.
 803   base::ThreadRestrictions::SetIOAllowed(true);
 804   BrowserThread::PostTask(
 805       BrowserThread::IO, FROM_HERE,
 806       base::Bind(base::IgnoreResult(&base::ThreadRestrictions::SetIOAllowed),
 807                  true));
 808
 809 #if !defined(OS_IOS)
 810   if (RenderProcessHost::run_renderer_in_process())
 811     RenderProcessHostImpl::ShutDownInProcessRenderer();
 812 #endif
 813
 814   if (parts_) {
 815     TRACE_EVENT0("shutdown",
 816                  "BrowserMainLoop::Subsystem:PostMainMessageLoopRun");
 817     parts_->PostMainMessageLoopRun();
 818   }
 819
 820   trace_memory_controller_.reset();
 821   system_stats_monitor_.reset();
 822
 823 #if !defined(OS_IOS)
 824   // Destroying the GpuProcessHostUIShims on the UI thread posts a task to
 825   // delete related objects on the GPU thread. This must be done before
 826   // stopping the GPU thread. The GPU thread will close IPC channels to renderer
 827   // processes so this has to happen before stopping the IO thread.
 828   {
 829     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:GPUProcessHostShim");
 830     GpuProcessHostUIShim::DestroyAll();
 831   }
 832   // Cancel pending requests and prevent new requests.
 833   if (resource_dispatcher_host_) {
 834     TRACE_EVENT0("shutdown",
 835                  "BrowserMainLoop::Subsystem:ResourceDispatcherHost");
 836     resource_dispatcher_host_.get()->Shutdown();
 837   }
 838
 839 #if defined(OS_CHROMEOS)
 840   memory_pressure_observer_.reset();
 841 #endif
 842
 843 #if defined(OS_MACOSX)
 844   BrowserCompositorMac::DisableRecyclingForShutdown();
 845 #endif
 846
 847 #if defined(USE_AURA) || defined(OS_MACOSX)
 848   {
 849     TRACE_EVENT0("shutdown",
 850                  "BrowserMainLoop::Subsystem:ImageTransportFactory");
 851     ImageTransportFactory::Terminate();
 852   }
 853 #endif
 854
 855 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 856   ZygoteHostImpl::GetInstance()->TearDownAfterLastChild();
 857 #endif  // defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 858
 859   // The device monitors are using |system_monitor_| as dependency, so delete
 860   // them before |system_monitor_| goes away.
 861   // On Mac and windows, the monitor needs to be destroyed on the same thread
 862   // as they were created. On Linux, the monitor will be deleted when IO thread
 863   // goes away.
 864 #if defined(OS_WIN)
 865   system_message_window_.reset();
 866 #elif defined(OS_MACOSX)
 867   device_monitor_mac_.reset();
 868 #endif
 869 #endif  // !defined(OS_IOS)
 870
 871   // Must be size_t so we can subtract from it.
 872   for (size_t thread_id = BrowserThread::ID_COUNT - 1;
 873        thread_id >= (BrowserThread::UI + 1);
 874        --thread_id) {
 875     // Find the thread object we want to stop. Looping over all valid
 876     // BrowserThread IDs and DCHECKing on a missing case in the switch
 877     // statement helps avoid a mismatch between this code and the
 878     // BrowserThread::ID enumeration.
 879     //
 880     // The destruction order is the reverse order of occurrence in the
 881     // BrowserThread::ID list. The rationale for the order is as
 882     // follows (need to be filled in a bit):
 883     //
 884     //
 885     // - The IO thread is the only user of the CACHE thread.
 886     //
 887     // - The PROCESS_LAUNCHER thread must be stopped after IO in case
 888     //   the IO thread posted a task to terminate a process on the
 889     //   process launcher thread.
 890     //
 891     // - (Not sure why DB stops last.)
 892     switch (thread_id) {
 893       case BrowserThread::DB: {
 894         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:DBThread");
 895         ResetThread_DB(db_thread_.Pass());
 896         break;
 897       }
 898       case BrowserThread::FILE: {
 899         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:FileThread");
 900 #if !defined(OS_IOS)
 901         // Clean up state that lives on or uses the file_thread_ before
 902         // it goes away.
 903         if (resource_dispatcher_host_)
 904           resource_dispatcher_host_.get()->save_file_manager()->Shutdown();
 905 #endif  // !defined(OS_IOS)
 906         ResetThread_FILE(file_thread_.Pass());
 907         break;
 908       }
 909       case BrowserThread::FILE_USER_BLOCKING: {
 910         TRACE_EVENT0("shutdown",
 911                       "BrowserMainLoop::Subsystem:FileUserBlockingThread");
 912         ResetThread_FILE_USER_BLOCKING(file_user_blocking_thread_.Pass());
 913         break;
 914       }
 915       case BrowserThread::PROCESS_LAUNCHER: {
 916         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:LauncherThread");
 917         ResetThread_PROCESS_LAUNCHER(process_launcher_thread_.Pass());
 918         break;
 919       }
 920       case BrowserThread::CACHE: {
 921         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:CacheThread");
 922         ResetThread_CACHE(cache_thread_.Pass());
 923         break;
 924       }
 925       case BrowserThread::IO: {
 926         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:IOThread");
 927         ResetThread_IO(io_thread_.Pass());
 928         break;
 929       }
 930       case BrowserThread::UI:
 931       case BrowserThread::ID_COUNT:
 932       default:
 933         NOTREACHED();
 934         break;
 935     }
 936   }
 937
 938 #if !defined(OS_IOS)
 939   {
 940     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:IndexedDBThread");
 941     ResetThread_IndexedDb(indexed_db_thread_.Pass());
 942   }
 943 #endif
 944
 945   // Close the blocking I/O pool after the other threads. Other threads such
 946   // as the I/O thread may need to schedule work like closing files or flushing
 947   // data during shutdown, so the blocking pool needs to be available. There
 948   // may also be slow operations pending that will blcok shutdown, so closing
 949   // it here (which will block until required operations are complete) gives
 950   // more head start for those operations to finish.
 951   {
 952     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:ThreadPool");
 953     BrowserThreadImpl::ShutdownThreadPool();
 954   }
 955
 956 #if !defined(OS_IOS)
 957   // Must happen after the IO thread is shutdown since this may be accessed from
 958   // it.
 959   {
 960     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:GPUChannelFactory");
 961     if (BrowserGpuChannelHostFactory::instance())
 962       BrowserGpuChannelHostFactory::Terminate();
 963   }
 964
 965   // Must happen after the I/O thread is shutdown since this class lives on the
 966   // I/O thread and isn't threadsafe.
 967   {
 968     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:GamepadService");
 969     GamepadService::GetInstance()->Terminate();
 970   }
 971   {
 972     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:SensorService");
 973     DeviceInertialSensorService::GetInstance()->Shutdown();
 974   }
 975   {
 976     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:BatteryStatusService");
 977     device::BatteryStatusService::GetInstance()->Shutdown();
 978   }
 979   {
 980     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:DeleteDataSources");
 981     URLDataManager::DeleteDataSources();
 982   }
 983 #endif  // !defined(OS_IOS)
 984
 985   if (parts_) {
 986     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:PostDestroyThreads");
 987     parts_->PostDestroyThreads();
 988   }
 989 }
 990
 991 void BrowserMainLoop::StopStartupTracingTimer() {
 992   startup_trace_timer_.Stop();
 993 }
 994
 995 void BrowserMainLoop::InitializeMainThread() {
 996   TRACE_EVENT0("startup", "BrowserMainLoop::InitializeMainThread");
 997   const char* kThreadName = "CrBrowserMain";
 998   base::PlatformThread::SetName(kThreadName);
 999   if (main_message_loop_)
1000     main_message_loop_->set_thread_name(kThreadName);
1001
1002   // Register the main thread by instantiating it, but don't call any methods.
1003   main_thread_.reset(
1004       new BrowserThreadImpl(BrowserThread::UI, base::MessageLoop::current()));
1005 }
1006
1007 int BrowserMainLoop::BrowserThreadsStarted() {
1008   TRACE_EVENT0("startup", "BrowserMainLoop::BrowserThreadsStarted");
1009
1010 #if !defined(OS_IOS)
1011   indexed_db_thread_.reset(new base::Thread("IndexedDB"));
1012   indexed_db_thread_->Start();
1013 #endif
1014
1015 #if defined(OS_ANDROID)
1016   // Up the priority of anything that touches with display tasks
1017   // (this thread is UI thread, and io_thread_ is for IPCs).
1018   io_thread_->SetPriority(base::kThreadPriority_Display);
1019   base::PlatformThread::SetThreadPriority(
1020       base::PlatformThread::CurrentHandle(),
1021       base::kThreadPriority_Display);
1022 #endif
1023
1024 #if !defined(OS_IOS)
1025   HistogramSynchronizer::GetInstance();
1026
1027   bool initialize_gpu_data_manager = true;
1028 #if defined(OS_ANDROID)
1029   // On Android, GLSurface::InitializeOneOff() must be called before initalizing
1030   // the GpuDataManagerImpl as it uses the GL bindings. crbug.com/326295
1031   if (!gfx::GLSurface::InitializeOneOff()) {
1032     LOG(ERROR) << "GLSurface::InitializeOneOff failed";
1033     initialize_gpu_data_manager = false;
1034   }
1035 #endif
1036
1037   // Initialize the GpuDataManager before we set up the MessageLoops because
1038   // otherwise we'll trigger the assertion about doing IO on the UI thread.
1039   if (initialize_gpu_data_manager)
1040     GpuDataManagerImpl::GetInstance()->Initialize();
1041
1042   bool always_uses_gpu = true;
1043   bool established_gpu_channel = false;
1044 #if defined(USE_AURA) || defined(OS_MACOSX)
1045   established_gpu_channel = true;
1046   if (!GpuDataManagerImpl::GetInstance()->CanUseGpuBrowserCompositor()) {
1047     established_gpu_channel = always_uses_gpu = false;
1048   }
1049   BrowserGpuChannelHostFactory::Initialize(established_gpu_channel);
1050   ImageTransportFactory::Initialize();
1051 #if defined(USE_AURA)
1052   if (aura::Env::GetInstance()) {
1053     aura::Env::GetInstance()->set_context_factory(GetContextFactory());
1054   }
1055 #endif
1056 #elif defined(OS_ANDROID)
1057   // TODO(crbug.com/439322): This should be set to |true|.
1058   established_gpu_channel = false;
1059   BrowserGpuChannelHostFactory::Initialize(established_gpu_channel);
1060 #endif
1061
1062 #if defined(OS_LINUX) && defined(USE_UDEV)
1063   device_monitor_linux_.reset(new DeviceMonitorLinux());
1064 #elif defined(OS_MACOSX)
1065   device_monitor_mac_.reset(new DeviceMonitorMac());
1066 #endif
1067
1068   // RDH needs the IO thread to be created
1069   {
1070     TRACE_EVENT0("startup",
1071       "BrowserMainLoop::BrowserThreadsStarted:InitResourceDispatcherHost");
1072     resource_dispatcher_host_.reset(new ResourceDispatcherHostImpl());
1073   }
1074
1075   // MediaStreamManager needs the IO thread to be created.
1076   {
1077     TRACE_EVENT0("startup",
1078       "BrowserMainLoop::BrowserThreadsStarted:InitMediaStreamManager");
1079     media_stream_manager_.reset(new MediaStreamManager(audio_manager_.get()));
1080   }
1081
1082   {
1083     TRACE_EVENT0("startup",
1084       "BrowserMainLoop::BrowserThreadsStarted:InitSpeechRecognition");
1085     speech_recognition_manager_.reset(new SpeechRecognitionManagerImpl(
1086         audio_manager_.get(), media_stream_manager_.get()));
1087   }
1088
1089   {
1090     TRACE_EVENT0(
1091         "startup",
1092         "BrowserMainLoop::BrowserThreadsStarted::InitUserInputMonitor");
1093     user_input_monitor_ = media::UserInputMonitor::Create(
1094         io_thread_->message_loop_proxy(), main_thread_->message_loop_proxy());
1095   }
1096
1097   {
1098     TRACE_EVENT0("startup",
1099                  "BrowserMainLoop::BrowserThreadsStarted::TimeZoneMonitor");
1100     time_zone_monitor_ = TimeZoneMonitor::Create();
1101   }
1102
1103   // Alert the clipboard class to which threads are allowed to access the
1104   // clipboard:
1105   std::vector<base::PlatformThreadId> allowed_clipboard_threads;
1106   // The current thread is the UI thread.
1107   allowed_clipboard_threads.push_back(base::PlatformThread::CurrentId());
1108 #if defined(OS_WIN)
1109   // On Windows, clipboards are also used on the File or IO threads.
1110   allowed_clipboard_threads.push_back(file_thread_->thread_id());
1111   allowed_clipboard_threads.push_back(io_thread_->thread_id());
1112 #endif
1113   ui::Clipboard::SetAllowedThreads(allowed_clipboard_threads);
1114
1115   // When running the GPU thread in-process, avoid optimistically starting it
1116   // since creating the GPU thread races against creation of the one-and-only
1117   // ChildProcess instance which is created by the renderer thread.
1118   if (GpuDataManagerImpl::GetInstance()->GpuAccessAllowed(NULL) &&
1119       !established_gpu_channel &&
1120       always_uses_gpu &&
1121       !parsed_command_line_.HasSwitch(switches::kSingleProcess) &&
1122       !parsed_command_line_.HasSwitch(switches::kInProcessGPU)) {
1123     TRACE_EVENT_INSTANT0("gpu", "Post task to launch GPU process",
1124                          TRACE_EVENT_SCOPE_THREAD);
1125     BrowserThread::PostTask(
1126         BrowserThread::IO, FROM_HERE, base::Bind(
1127             base::IgnoreResult(&GpuProcessHost::Get),
1128             GpuProcessHost::GPU_PROCESS_KIND_SANDBOXED,
1129             CAUSE_FOR_GPU_LAUNCH_BROWSER_STARTUP));
1130   }
1131
1132 #if defined(OS_MACOSX)
1133   ThemeHelperMac::GetInstance();
1134   SystemHotkeyHelperMac::GetInstance()->DeferredLoadSystemHotkeys();
1135   if (ShouldEnableBootstrapSandbox()) {
1136     TRACE_EVENT0("startup",
1137         "BrowserMainLoop::BrowserThreadsStarted:BootstrapSandbox");
1138     CHECK(GetBootstrapSandbox());
1139   }
1140 #endif  // defined(OS_MACOSX)
1141
1142 #endif  // !defined(OS_IOS)
1143
1144   return result_code_;
1145 }
1146
1147 bool BrowserMainLoop::InitializeToolkit() {
1148   TRACE_EVENT0("startup", "BrowserMainLoop::InitializeToolkit");
1149   // TODO(evan): this function is rather subtle, due to the variety
1150   // of intersecting ifdefs we have.  To keep it easy to follow, there
1151   // are no #else branches on any #ifs.
1152   // TODO(stevenjb): Move platform specific code into platform specific Parts
1153   // (Need to add InitializeToolkit stage to BrowserParts).
1154   // See also GTK setup in EarlyInitialization, above, and associated comments.
1155
1156 #if defined(OS_WIN)
1157   // Init common control sex.
1158   INITCOMMONCONTROLSEX config;
1159   config.dwSize = sizeof(config);
1160   config.dwICC = ICC_WIN95_CLASSES;
1161   if (!InitCommonControlsEx(&config))
1162     PLOG(FATAL);
1163 #endif
1164
1165 #if defined(USE_AURA)
1166
1167 #if defined(USE_X11)
1168   if (!gfx::GetXDisplay())
1169     return false;
1170 #endif
1171
1172   // Env creates the compositor. Aura widgets need the compositor to be created
1173   // before they can be initialized by the browser.
1174   aura::Env::CreateInstance(true);
1175 #endif  // defined(USE_AURA)
1176
1177   if (parts_)
1178     parts_->ToolkitInitialized();
1179
1180   return true;
1181 }
1182
1183 void BrowserMainLoop::MainMessageLoopRun() {
1184 #if defined(OS_ANDROID)
1185   // Android's main message loop is the Java message loop.
1186   NOTREACHED();
1187 #else
1188   DCHECK(base::MessageLoopForUI::IsCurrent());
1189   if (parameters_.ui_task)
1190     base::MessageLoopForUI::current()->PostTask(FROM_HERE,
1191                                                 *parameters_.ui_task);
1192
1193   base::RunLoop run_loop;
1194   run_loop.Run();
1195 #endif
1196 }
1197
1198 base::FilePath BrowserMainLoop::GetStartupTraceFileName(
1199     const base::CommandLine& command_line) const {
1200   base::FilePath trace_file = command_line.GetSwitchValuePath(
1201       switches::kTraceStartupFile);
1202   // trace_file = "none" means that startup events will show up for the next
1203   // begin/end tracing (via about:tracing or AutomationProxy::BeginTracing/
1204   // EndTracing, for example).
1205   if (trace_file == base::FilePath().AppendASCII("none"))
1206     return trace_file;
1207
1208   if (trace_file.empty()) {
1209 #if defined(OS_ANDROID)
1210     TracingControllerAndroid::GenerateTracingFilePath(&trace_file);
1211 #else
1212     // Default to saving the startup trace into the current dir.
1213     trace_file = base::FilePath().AppendASCII("chrometrace.log");
1214 #endif
1215   }
1216
1217   return trace_file;
1218 }
1219
1220 void BrowserMainLoop::InitStartupTracing(
1221     const base::CommandLine& command_line) {
1222   DCHECK(is_tracing_startup_);
1223
1224   startup_trace_file_ = GetStartupTraceFileName(parsed_command_line_);
1225
1226   std::string delay_str = command_line.GetSwitchValueASCII(
1227       switches::kTraceStartupDuration);
1228   int delay_secs = 5;
1229   if (!delay_str.empty() && !base::StringToInt(delay_str, &delay_secs)) {
1230     DLOG(WARNING) << "Could not parse --" << switches::kTraceStartupDuration
1231         << "=" << delay_str << " defaulting to 5 (secs)";
1232     delay_secs = 5;
1233   }
1234
1235   startup_trace_timer_.Start(FROM_HERE,
1236                              base::TimeDelta::FromSeconds(delay_secs),
1237                              this,
1238                              &BrowserMainLoop::EndStartupTracing);
1239 }
1240
1241 void BrowserMainLoop::EndStartupTracing() {
1242   is_tracing_startup_ = false;
1243   TracingController::GetInstance()->DisableRecording(
1244       TracingController::CreateFileSink(
1245           startup_trace_file_,
1246           base::Bind(OnStoppedStartupTracing, startup_trace_file_)));
1247 }
1248
1249 }  // namespace content