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/logging.h"
  10 #include "base/message_loop/message_loop.h"
  11 #include "base/metrics/field_trial.h"
  12 #include "base/metrics/histogram.h"
  13 #include "base/pending_task.h"
  14 #include "base/power_monitor/power_monitor.h"
  15 #include "base/power_monitor/power_monitor_device_source.h"
  16 #include "base/process/process_metrics.h"
  17 #include "base/profiler/scoped_profile.h"
  18 #include "base/run_loop.h"
  19 #include "base/strings/string_number_conversions.h"
  20 #include "base/strings/string_split.h"
  21 #include "base/system_monitor/system_monitor.h"
  22 #include "base/thread_task_runner_handle.h"
  23 #include "base/threading/thread_restrictions.h"
  24 #include "base/timer/hi_res_timer_manager.h"
  25 #include "base/trace_event/memory_dump_manager.h"
  26 #include "base/trace_event/trace_event.h"
  27 #include "content/browser/browser_thread_impl.h"
  28 #include "content/browser/device_sensors/device_inertial_sensor_service.h"
  29 #include "content/browser/dom_storage/dom_storage_area.h"
  30 #include "content/browser/download/save_file_manager.h"
  31 #include "content/browser/gamepad/gamepad_service.h"
  32 #include "content/browser/gpu/browser_gpu_channel_host_factory.h"
  33 #include "content/browser/gpu/browser_gpu_memory_buffer_manager.h"
  34 #include "content/browser/gpu/compositor_util.h"
  35 #include "content/browser/gpu/gpu_data_manager_impl.h"
  36 #include "content/browser/gpu/gpu_process_host.h"
  37 #include "content/browser/gpu/gpu_process_host_ui_shim.h"
  38 #include "content/browser/histogram_synchronizer.h"
  39 #include "content/browser/loader/resource_dispatcher_host_impl.h"
  40 #include "content/browser/media/media_internals.h"
  41 #include "content/browser/net/browser_online_state_observer.h"
  42 #include "content/browser/renderer_host/media/media_stream_manager.h"
  43 #include "content/browser/speech/speech_recognition_manager_impl.h"
  44 #include "content/browser/startup_task_runner.h"
  45 #include "content/browser/time_zone_monitor.h"
  46 #include "content/browser/webui/content_web_ui_controller_factory.h"
  47 #include "content/browser/webui/url_data_manager.h"
  48 #include "content/common/content_switches_internal.h"
  49 #include "content/common/host_discardable_shared_memory_manager.h"
  50 #include "content/common/host_shared_bitmap_manager.h"
  51 #include "content/public/browser/browser_main_parts.h"
  52 #include "content/public/browser/browser_shutdown.h"
  53 #include "content/public/browser/content_browser_client.h"
  54 #include "content/public/browser/render_process_host.h"
  55 #include "content/public/browser/tracing_controller.h"
  56 #include "content/public/common/content_switches.h"
  57 #include "content/public/common/main_function_params.h"
  58 #include "content/public/common/result_codes.h"
  59 #include "crypto/nss_util.h"
  60 #include "device/battery/battery_status_service.h"
  61 #include "media/audio/audio_manager.h"
  62 #include "media/base/media.h"
  63 #include "media/base/user_input_monitor.h"
  64 #include "media/midi/midi_manager.h"
  65 #include "net/base/network_change_notifier.h"
  66 #include "net/socket/client_socket_factory.h"
  67 #include "net/ssl/ssl_config_service.h"
  68 #include "ui/base/clipboard/clipboard.h"
  69
  70 #if defined(USE_AURA) || (defined(OS_MACOSX) && !defined(OS_IOS))
  71 #include "content/browser/compositor/image_transport_factory.h"
  72 #endif
  73
  74 #if defined(USE_AURA)
  75 #include "content/public/browser/context_factory.h"
  76 #include "ui/aura/env.h"
  77 #endif
  78
  79 #if !defined(OS_IOS)
  80 #include "content/browser/renderer_host/render_process_host_impl.h"
  81 #endif
  82
  83 #if defined(OS_ANDROID)
  84 #include "base/android/jni_android.h"
  85 #include "content/browser/android/browser_startup_controller.h"
  86 #include "content/browser/android/browser_surface_texture_manager.h"
  87 #include "content/browser/android/tracing_controller_android.h"
  88 #include "content/browser/screen_orientation/screen_orientation_delegate_android.h"
  89 #include "content/public/browser/screen_orientation_provider.h"
  90 #include "ui/gl/gl_surface.h"
  91 #endif
  92
  93 #if defined(OS_MACOSX) && !defined(OS_IOS)
  94 #include "base/mac/memory_pressure_monitor_mac.h"
  95 #include "content/browser/bootstrap_sandbox_mac.h"
  96 #include "content/browser/cocoa/system_hotkey_helper_mac.h"
  97 #include "content/browser/compositor/browser_compositor_view_mac.h"
  98 #include "content/browser/theme_helper_mac.h"
  99 #endif
 100
 101 #if defined(OS_WIN)
 102 #include <windows.h>
 103 #include <commctrl.h>
 104 #include <shellapi.h>
 105
 106 #include "base/win/memory_pressure_monitor.h"
 107 #include "content/browser/system_message_window_win.h"
 108 #include "content/common/sandbox_win.h"
 109 #include "net/base/winsock_init.h"
 110 #include "ui/base/l10n/l10n_util_win.h"
 111 #endif
 112
 113 #if defined(OS_CHROMEOS)
 114 #include "base/chromeos/memory_pressure_monitor_chromeos.h"
 115 #include "chromeos/chromeos_switches.h"
 116 #endif
 117
 118 #if defined(USE_GLIB)
 119 #include <glib-object.h>
 120 #endif
 121
 122 #if defined(OS_LINUX) && defined(USE_UDEV)
 123 #include "content/browser/device_monitor_udev.h"
 124 #elif defined(OS_MACOSX) && !defined(OS_IOS)
 125 #include "content/browser/device_monitor_mac.h"
 126 #endif
 127
 128 #if defined(OS_POSIX) && !defined(OS_MACOSX)
 129 #include "content/browser/renderer_host/render_sandbox_host_linux.h"
 130 #include "content/browser/zygote_host/zygote_host_impl_linux.h"
 131 #include "sandbox/linux/suid/client/setuid_sandbox_host.h"
 132 #endif
 133
 134 #if defined(ENABLE_PLUGINS)
 135 #include "content/browser/plugin_service_impl.h"
 136 #endif
 137
 138 #if defined(TCMALLOC_TRACE_MEMORY_SUPPORTED)
 139 #include "third_party/tcmalloc/chromium/src/gperftools/heap-profiler.h"
 140 #endif
 141
 142 #if defined(USE_X11)
 143 #include "ui/gfx/x/x11_connection.h"
 144 #include "ui/gfx/x/x11_types.h"
 145 #endif
 146
 147 // One of the linux specific headers defines this as a macro.
 148 #ifdef DestroyAll
 149 #undef DestroyAll
 150 #endif
 151
 152 namespace content {
 153 namespace {
 154
 155 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 156 void SetupSandbox(const base::CommandLine& parsed_command_line) {
 157   TRACE_EVENT0("startup", "SetupSandbox");
 158   base::FilePath sandbox_binary;
 159
 160   scoped_ptr<sandbox::SetuidSandboxHost> setuid_sandbox_host(
 161       sandbox::SetuidSandboxHost::Create());
 162
 163   const bool want_setuid_sandbox =
 164       !parsed_command_line.HasSwitch(switches::kNoSandbox) &&
 165       !parsed_command_line.HasSwitch(switches::kDisableSetuidSandbox) &&
 166       !setuid_sandbox_host->IsDisabledViaEnvironment();
 167
 168   static const char no_suid_error[] =
 169       "Running without the SUID sandbox! See "
 170       "https://code.google.com/p/chromium/wiki/LinuxSUIDSandboxDevelopment "
 171       "for more information on developing with the sandbox on.";
 172   if (want_setuid_sandbox) {
 173     sandbox_binary = setuid_sandbox_host->GetSandboxBinaryPath();
 174     if (sandbox_binary.empty()) {
 175       // This needs to be fatal. Talk to security@chromium.org if you feel
 176       // otherwise.
 177       LOG(FATAL) << no_suid_error;
 178     }
 179   } else {
 180     LOG(ERROR) << no_suid_error;
 181   }
 182
 183   // Tickle the sandbox host and zygote host so they fork now.
 184   RenderSandboxHostLinux::GetInstance()->Init();
 185   ZygoteHostImpl::GetInstance()->Init(sandbox_binary.value());
 186 }
 187 #endif
 188
 189 #if defined(USE_GLIB)
 190 static void GLibLogHandler(const gchar* log_domain,
 191                            GLogLevelFlags log_level,
 192                            const gchar* message,
 193                            gpointer userdata) {
 194   if (!log_domain)
 195     log_domain = "<unknown>";
 196   if (!message)
 197     message = "<no message>";
 198
 199   if (strstr(message, "Unable to retrieve the file info for")) {
 200     LOG(ERROR) << "GTK File code error: " << message;
 201   } else if (strstr(message, "Could not find the icon") &&
 202              strstr(log_domain, "Gtk")) {
 203     LOG(ERROR) << "GTK icon error: " << message;
 204   } else if (strstr(message, "Theme file for default has no") ||
 205              strstr(message, "Theme directory") ||
 206              strstr(message, "theme pixmap") ||
 207              strstr(message, "locate theme engine")) {
 208     LOG(ERROR) << "GTK theme error: " << message;
 209   } else if (strstr(message, "Unable to create Ubuntu Menu Proxy") &&
 210              strstr(log_domain, "<unknown>")) {
 211     LOG(ERROR) << "GTK menu proxy create failed";
 212   } else if (strstr(message, "Out of memory") &&
 213              strstr(log_domain, "<unknown>")) {
 214     LOG(ERROR) << "DBus call timeout or out of memory: "
 215                << "http://crosbug.com/15496";
 216   } else if (strstr(message, "Could not connect: Connection refused") &&
 217              strstr(log_domain, "<unknown>")) {
 218     LOG(ERROR) << "DConf settings backend could not connect to session bus: "
 219                << "http://crbug.com/179797";
 220   } else if (strstr(message, "Attempting to store changes into") ||
 221              strstr(message, "Attempting to set the permissions of")) {
 222     LOG(ERROR) << message << " (http://bugs.chromium.org/161366)";
 223   } else if (strstr(message, "drawable is not a native X11 window")) {
 224     LOG(ERROR) << message << " (http://bugs.chromium.org/329991)";
 225   } else {
 226     LOG(DFATAL) << log_domain << ": " << message;
 227   }
 228 }
 229
 230 static void SetUpGLibLogHandler() {
 231   // Register GLib-handled assertions to go through our logging system.
 232   const char* kLogDomains[] = { NULL, "Gtk", "Gdk", "GLib", "GLib-GObject" };
 233   for (size_t i = 0; i < arraysize(kLogDomains); i++) {
 234     g_log_set_handler(kLogDomains[i],
 235                       static_cast<GLogLevelFlags>(G_LOG_FLAG_RECURSION |
 236                                                   G_LOG_FLAG_FATAL |
 237                                                   G_LOG_LEVEL_ERROR |
 238                                                   G_LOG_LEVEL_CRITICAL |
 239                                                   G_LOG_LEVEL_WARNING),
 240                       GLibLogHandler,
 241                       NULL);
 242   }
 243 }
 244 #endif
 245
 246 void OnStoppedStartupTracing(const base::FilePath& trace_file) {
 247   VLOG(0) << "Completed startup tracing to " << trace_file.value();
 248 }
 249
 250 // Disable optimizations for this block of functions so the compiler doesn't
 251 // merge them all together. This makes it possible to tell what thread was
 252 // unresponsive by inspecting the callstack.
 253 MSVC_DISABLE_OPTIMIZE()
 254 MSVC_PUSH_DISABLE_WARNING(4748)
 255
 256 NOINLINE void ResetThread_DB(scoped_ptr<BrowserProcessSubThread> thread) {
 257   volatile int inhibit_comdat = __LINE__;
 258   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 259   thread.reset();
 260 }
 261
 262 NOINLINE void ResetThread_FILE(scoped_ptr<BrowserProcessSubThread> thread) {
 263   volatile int inhibit_comdat = __LINE__;
 264   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 265   thread.reset();
 266 }
 267
 268 NOINLINE void ResetThread_FILE_USER_BLOCKING(
 269     scoped_ptr<BrowserProcessSubThread> thread) {
 270   volatile int inhibit_comdat = __LINE__;
 271   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 272   thread.reset();
 273 }
 274
 275 NOINLINE void ResetThread_PROCESS_LAUNCHER(
 276     scoped_ptr<BrowserProcessSubThread> thread) {
 277   volatile int inhibit_comdat = __LINE__;
 278   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 279   thread.reset();
 280 }
 281
 282 NOINLINE void ResetThread_CACHE(scoped_ptr<BrowserProcessSubThread> thread) {
 283   volatile int inhibit_comdat = __LINE__;
 284   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 285   thread.reset();
 286 }
 287
 288 NOINLINE void ResetThread_IO(scoped_ptr<BrowserProcessSubThread> thread) {
 289   volatile int inhibit_comdat = __LINE__;
 290   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 291   thread.reset();
 292 }
 293
 294 #if !defined(OS_IOS)
 295 NOINLINE void ResetThread_IndexedDb(scoped_ptr<base::Thread> thread) {
 296   volatile int inhibit_comdat = __LINE__;
 297   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 298   thread.reset();
 299 }
 300 #endif
 301
 302 MSVC_POP_WARNING()
 303 MSVC_ENABLE_OPTIMIZE();
 304
 305 #if defined(OS_WIN)
 306 // Creates a memory pressure monitor using automatic thresholds, or those
 307 // specified on the command-line. Ownership is passed to the caller.
 308 base::win::MemoryPressureMonitor* CreateWinMemoryPressureMonitor(
 309     const base::CommandLine& parsed_command_line) {
 310   std::vector<std::string> thresholds;
 311   base::SplitString(
 312       parsed_command_line.GetSwitchValueASCII(
 313           switches::kMemoryPressureThresholdsMb),
 314       ',',
 315       &thresholds);
 316
 317   int moderate_threshold_mb = 0;
 318   int critical_threshold_mb = 0;
 319   if (thresholds.size() == 2 &&
 320       base::StringToInt(thresholds[0], &moderate_threshold_mb) &&
 321       base::StringToInt(thresholds[1], &critical_threshold_mb) &&
 322       moderate_threshold_mb >= critical_threshold_mb &&
 323       critical_threshold_mb >= 0) {
 324     return new base::win::MemoryPressureMonitor(moderate_threshold_mb,
 325                                                 critical_threshold_mb);
 326   }
 327
 328   // In absence of valid switches use the automatic defaults.
 329   return new base::win::MemoryPressureMonitor();
 330 }
 331 #endif  // defined(OS_WIN)
 332
 333 }  // namespace
 334
 335 // The currently-running BrowserMainLoop.  There can be one or zero.
 336 BrowserMainLoop* g_current_browser_main_loop = NULL;
 337
 338 // This is just to be able to keep ShutdownThreadsAndCleanUp out of
 339 // the public interface of BrowserMainLoop.
 340 class BrowserShutdownImpl {
 341  public:
 342   static void ImmediateShutdownAndExitProcess() {
 343     DCHECK(g_current_browser_main_loop);
 344     g_current_browser_main_loop->ShutdownThreadsAndCleanUp();
 345
 346 #if defined(OS_WIN)
 347     // At this point the message loop is still running yet we've shut everything
 348     // down. If any messages are processed we'll likely crash. Exit now.
 349     ExitProcess(RESULT_CODE_NORMAL_EXIT);
 350 #elif defined(OS_POSIX) && !defined(OS_MACOSX)
 351     _exit(RESULT_CODE_NORMAL_EXIT);
 352 #else
 353     NOTIMPLEMENTED();
 354 #endif
 355   }
 356 };
 357
 358 void ImmediateShutdownAndExitProcess() {
 359   BrowserShutdownImpl::ImmediateShutdownAndExitProcess();
 360 }
 361
 362 // For measuring memory usage after each task. Behind a command line flag.
 363 class BrowserMainLoop::MemoryObserver : public base::MessageLoop::TaskObserver {
 364  public:
 365   MemoryObserver() {}
 366   ~MemoryObserver() override {}
 367
 368   void WillProcessTask(const base::PendingTask& pending_task) override {}
 369
 370   void DidProcessTask(const base::PendingTask& pending_task) override {
 371 #if !defined(OS_IOS)  // No ProcessMetrics on IOS.
 372     scoped_ptr<base::ProcessMetrics> process_metrics(
 373         base::ProcessMetrics::CreateProcessMetrics(
 374 #if defined(OS_MACOSX)
 375             base::GetCurrentProcessHandle(), NULL));
 376 #else
 377             base::GetCurrentProcessHandle()));
 378 #endif
 379     size_t private_bytes;
 380     process_metrics->GetMemoryBytes(&private_bytes, NULL);
 381     LOCAL_HISTOGRAM_MEMORY_KB("Memory.BrowserUsed", private_bytes >> 10);
 382 #endif
 383   }
 384  private:
 385   DISALLOW_COPY_AND_ASSIGN(MemoryObserver);
 386 };
 387
 388
 389 // BrowserMainLoop construction / destruction =============================
 390
 391 BrowserMainLoop* BrowserMainLoop::GetInstance() {
 392   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 393   return g_current_browser_main_loop;
 394 }
 395
 396 BrowserMainLoop::BrowserMainLoop(const MainFunctionParams& parameters)
 397     : parameters_(parameters),
 398       parsed_command_line_(parameters.command_line),
 399       result_code_(RESULT_CODE_NORMAL_EXIT),
 400       created_threads_(false),
 401       // ContentMainRunner should have enabled tracing of the browser process
 402       // when kTraceStartup is in the command line.
 403       is_tracing_startup_(
 404           parameters.command_line.HasSwitch(switches::kTraceStartup)) {
 405   DCHECK(!g_current_browser_main_loop);
 406   g_current_browser_main_loop = this;
 407 }
 408
 409 BrowserMainLoop::~BrowserMainLoop() {
 410   DCHECK_EQ(this, g_current_browser_main_loop);
 411 #if !defined(OS_IOS)
 412   ui::Clipboard::DestroyClipboardForCurrentThread();
 413 #endif  // !defined(OS_IOS)
 414   g_current_browser_main_loop = NULL;
 415 }
 416
 417 void BrowserMainLoop::Init() {
 418   TRACE_EVENT0("startup", "BrowserMainLoop::Init");
 419   TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::Init");
 420
 421   parts_.reset(
 422       GetContentClient()->browser()->CreateBrowserMainParts(parameters_));
 423 }
 424
 425 // BrowserMainLoop stages ==================================================
 426
 427 void BrowserMainLoop::EarlyInitialization() {
 428   TRACE_EVENT0("startup", "BrowserMainLoop::EarlyInitialization");
 429   TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::EarlyInitialization");
 430
 431 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 432   // No thread should be created before this call, as SetupSandbox()
 433   // will end-up using fork().
 434   SetupSandbox(parsed_command_line_);
 435 #endif
 436
 437 #if defined(USE_X11)
 438   if (UsingInProcessGpu()) {
 439     if (!gfx::InitializeThreadedX11()) {
 440       LOG(ERROR) << "Failed to put Xlib into threaded mode.";
 441     }
 442   }
 443 #endif
 444
 445   // GLib's spawning of new processes is buggy, so it's important that at this
 446   // point GLib does not need to start DBUS. Chrome should always start with
 447   // DBUS_SESSION_BUS_ADDRESS properly set. See crbug.com/309093.
 448 #if defined(USE_GLIB)
 449   // g_type_init will be deprecated in 2.36. 2.35 is the development
 450   // version for 2.36, hence do not call g_type_init starting 2.35.
 451   // http://developer.gnome.org/gobject/unstable/gobject-Type-Information.html#g-type-init
 452 #if !GLIB_CHECK_VERSION(2, 35, 0)
 453   // GLib type system initialization. Needed at least for gconf,
 454   // used in net/proxy/proxy_config_service_linux.cc. Most likely
 455   // this is superfluous as gtk_init() ought to do this. It's
 456   // definitely harmless, so retained as a reminder of this
 457   // requirement for gconf.
 458   g_type_init();
 459 #endif
 460
 461   SetUpGLibLogHandler();
 462 #endif
 463
 464   if (parts_)
 465     parts_->PreEarlyInitialization();
 466
 467 #if defined(OS_MACOSX)
 468   // We use quite a few file descriptors for our IPC, and the default limit on
 469   // the Mac is low (256), so bump it up.
 470   base::SetFdLimit(1024);
 471 #endif
 472
 473 #if defined(OS_WIN)
 474   net::EnsureWinsockInit();
 475 #endif
 476
 477 #if !defined(USE_OPENSSL)
 478   // We want to be sure to init NSPR on the main thread.
 479   crypto::EnsureNSPRInit();
 480 #endif  // !defined(USE_OPENSSL)
 481
 482 #if !defined(OS_IOS)
 483   if (parsed_command_line_.HasSwitch(switches::kRendererProcessLimit)) {
 484     std::string limit_string = parsed_command_line_.GetSwitchValueASCII(
 485         switches::kRendererProcessLimit);
 486     size_t process_limit;
 487     if (base::StringToSizeT(limit_string, &process_limit)) {
 488       RenderProcessHost::SetMaxRendererProcessCount(process_limit);
 489     }
 490   }
 491 #endif  // !defined(OS_IOS)
 492
 493   if (parsed_command_line_.HasSwitch(switches::kEnableNativeGpuMemoryBuffers)) {
 494     BrowserGpuChannelHostFactory::EnableGpuMemoryBufferFactoryUsage(
 495         gfx::GpuMemoryBuffer::MAP);
 496   }
 497
 498 #if defined(USE_OZONE)
 499   BrowserGpuChannelHostFactory::EnableGpuMemoryBufferFactoryUsage(
 500       gfx::GpuMemoryBuffer::SCANOUT);
 501 #endif
 502
 503   base::DiscardableMemoryAllocator::SetInstance(
 504       HostDiscardableSharedMemoryManager::current());
 505
 506   if (parts_)
 507     parts_->PostEarlyInitialization();
 508 }
 509
 510 void BrowserMainLoop::MainMessageLoopStart() {
 511   TRACE_EVENT0("startup", "BrowserMainLoop::MainMessageLoopStart");
 512   TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::MainMessageLoopStart");
 513
 514   if (parts_) {
 515     TRACE_EVENT0("startup",
 516         "BrowserMainLoop::MainMessageLoopStart:PreMainMessageLoopStart");
 517     parts_->PreMainMessageLoopStart();
 518   }
 519
 520 #if defined(OS_WIN)
 521   // If we're running tests (ui_task is non-null), then the ResourceBundle
 522   // has already been initialized.
 523   if (!parameters_.ui_task) {
 524     // Override the configured locale with the user's preferred UI language.
 525     l10n_util::OverrideLocaleWithUILanguageList();
 526   }
 527 #endif
 528
 529   // Create a MessageLoop if one does not already exist for the current thread.
 530   if (!base::MessageLoop::current())
 531     main_message_loop_.reset(new base::MessageLoopForUI);
 532
 533   InitializeMainThread();
 534
 535   {
 536     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:SystemMonitor");
 537     system_monitor_.reset(new base::SystemMonitor);
 538   }
 539   {
 540     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:PowerMonitor");
 541     scoped_ptr<base::PowerMonitorSource> power_monitor_source(
 542       new base::PowerMonitorDeviceSource());
 543     power_monitor_.reset(new base::PowerMonitor(power_monitor_source.Pass()));
 544   }
 545   {
 546     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:HighResTimerManager");
 547     hi_res_timer_manager_.reset(new base::HighResolutionTimerManager);
 548   }
 549   {
 550     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:NetworkChangeNotifier");
 551     network_change_notifier_.reset(net::NetworkChangeNotifier::Create());
 552   }
 553
 554 #if !defined(OS_IOS)
 555   {
 556     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:MediaFeatures");
 557     media::InitializeCPUSpecificMediaFeatures();
 558   }
 559   {
 560     TRACE_EVENT0("startup",
 561                  "BrowserMainLoop::Subsystem:ContentWebUIController");
 562     WebUIControllerFactory::RegisterFactory(
 563         ContentWebUIControllerFactory::GetInstance());
 564   }
 565
 566   {
 567     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:OnlineStateObserver");
 568     online_state_observer_.reset(new BrowserOnlineStateObserver);
 569   }
 570
 571   {
 572     system_stats_monitor_.reset(
 573         new base::trace_event::TraceEventSystemStatsMonitor(
 574             base::ThreadTaskRunnerHandle::Get()));
 575   }
 576 #endif  // !defined(OS_IOS)
 577
 578 #if defined(OS_WIN)
 579   system_message_window_.reset(new SystemMessageWindowWin);
 580 #endif
 581
 582   if (parts_)
 583     parts_->PostMainMessageLoopStart();
 584
 585 #if !defined(OS_IOS)
 586   // Start tracing to a file if needed. Only do this after starting the main
 587   // message loop to avoid calling MessagePumpForUI::ScheduleWork() before
 588   // MessagePumpForUI::Start() as it will crash the browser.
 589   if (is_tracing_startup_) {
 590     TRACE_EVENT0("startup", "BrowserMainLoop::InitStartupTracing");
 591     InitStartupTracing(parsed_command_line_);
 592   }
 593 #endif  // !defined(OS_IOS)
 594
 595 #if defined(OS_ANDROID)
 596   {
 597     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:SurfaceTextureManager");
 598     SurfaceTextureManager::InitInstance(new BrowserSurfaceTextureManager);
 599   }
 600
 601   if (!parsed_command_line_.HasSwitch(
 602       switches::kDisableScreenOrientationLock)) {
 603     TRACE_EVENT0("startup",
 604                  "BrowserMainLoop::Subsystem:ScreenOrientationProvider");
 605     screen_orientation_delegate_.reset(
 606         new ScreenOrientationDelegateAndroid());
 607     ScreenOrientationProvider::SetDelegate(screen_orientation_delegate_.get());
 608   }
 609 #endif
 610
 611   if (parsed_command_line_.HasSwitch(switches::kMemoryMetrics)) {
 612     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:MemoryObserver");
 613     memory_observer_.reset(new MemoryObserver());
 614     base::MessageLoop::current()->AddTaskObserver(memory_observer_.get());
 615   }
 616
 617   if (parsed_command_line_.HasSwitch(
 618           switches::kEnableAggressiveDOMStorageFlushing)) {
 619     TRACE_EVENT0("startup",
 620                  "BrowserMainLoop::Subsystem:EnableAggressiveCommitDelay");
 621     DOMStorageArea::EnableAggressiveCommitDelay();
 622   }
 623
 624   base::trace_event::MemoryDumpManager::GetInstance()->Initialize();
 625
 626   // Enable the dump providers.
 627   base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(
 628       HostSharedBitmapManager::current());
 629
 630 #if defined(TCMALLOC_TRACE_MEMORY_SUPPORTED)
 631   trace_memory_controller_.reset(new base::trace_event::TraceMemoryController(
 632       base::MessageLoop::current()->message_loop_proxy(),
 633       ::HeapProfilerWithPseudoStackStart, ::HeapProfilerStop,
 634       ::GetHeapProfile));
 635 #endif
 636 }
 637
 638 int BrowserMainLoop::PreCreateThreads() {
 639   if (parts_) {
 640     TRACE_EVENT0("startup",
 641         "BrowserMainLoop::CreateThreads:PreCreateThreads");
 642     TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::PreCreateThreads");
 643
 644     result_code_ = parts_->PreCreateThreads();
 645   }
 646
 647 #if defined(OS_CHROMEOS)
 648   if (chromeos::switches::MemoryPressureHandlingEnabled()) {
 649     memory_pressure_monitor_.reset(new base::MemoryPressureMonitorChromeOS(
 650         chromeos::switches::GetMemoryPressureThresholds()));
 651   }
 652 #elif defined(OS_MACOSX) && !defined(OS_IOS)
 653   memory_pressure_monitor_.reset(new base::MemoryPressureMonitorMac());
 654 #elif defined(OS_WIN)
 655   memory_pressure_monitor_.reset(CreateWinMemoryPressureMonitor(
 656       parsed_command_line_));
 657 #endif
 658
 659 #if defined(ENABLE_PLUGINS)
 660   // Prior to any processing happening on the io thread, we create the
 661   // plugin service as it is predominantly used from the io thread,
 662   // but must be created on the main thread. The service ctor is
 663   // inexpensive and does not invoke the io_thread() accessor.
 664   {
 665     TRACE_EVENT0("startup", "BrowserMainLoop::CreateThreads:PluginService");
 666     PluginService::GetInstance()->Init();
 667   }
 668 #endif
 669
 670   // Need to initialize in-process GpuDataManager before creating threads.
 671   // It's unsafe to append the gpu command line switches to the global
 672   // CommandLine::ForCurrentProcess object after threads are created.
 673   if (UsingInProcessGpu()) {
 674     bool initialize_gpu_data_manager = true;
 675 #if defined(OS_ANDROID)
 676     if (!gfx::GLSurface::InitializeOneOff()) {
 677       // Single-process Android WebView supports no gpu.
 678       LOG(ERROR) << "GLSurface::InitializeOneOff failed";
 679       initialize_gpu_data_manager = false;
 680     }
 681 #endif
 682
 683     // Initialize the GpuDataManager before we set up the MessageLoops because
 684     // otherwise we'll trigger the assertion about doing IO on the UI thread.
 685     if (initialize_gpu_data_manager)
 686       GpuDataManagerImpl::GetInstance()->Initialize();
 687   }
 688
 689 #if !defined(OS_IOS) && (!defined(GOOGLE_CHROME_BUILD) || defined(OS_ANDROID))
 690   // Single-process is an unsupported and not fully tested mode, so
 691   // don't enable it for official Chrome builds (except on Android).
 692   if (parsed_command_line_.HasSwitch(switches::kSingleProcess))
 693     RenderProcessHost::SetRunRendererInProcess(true);
 694 #endif
 695
 696   return result_code_;
 697 }
 698
 699 void BrowserMainLoop::CreateStartupTasks() {
 700   TRACE_EVENT0("startup", "BrowserMainLoop::CreateStartupTasks");
 701   TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::CreateStartupTasks");
 702
 703   // First time through, we really want to create all the tasks
 704   if (!startup_task_runner_.get()) {
 705 #if defined(OS_ANDROID)
 706     startup_task_runner_ = make_scoped_ptr(new StartupTaskRunner(
 707         base::Bind(&BrowserStartupComplete),
 708         base::MessageLoop::current()->message_loop_proxy()));
 709 #else
 710     startup_task_runner_ = make_scoped_ptr(new StartupTaskRunner(
 711         base::Callback<void(int)>(),
 712         base::MessageLoop::current()->message_loop_proxy()));
 713 #endif
 714     StartupTask pre_create_threads =
 715         base::Bind(&BrowserMainLoop::PreCreateThreads, base::Unretained(this));
 716     startup_task_runner_->AddTask(pre_create_threads);
 717
 718     StartupTask create_threads =
 719         base::Bind(&BrowserMainLoop::CreateThreads, base::Unretained(this));
 720     startup_task_runner_->AddTask(create_threads);
 721
 722     StartupTask browser_thread_started = base::Bind(
 723         &BrowserMainLoop::BrowserThreadsStarted, base::Unretained(this));
 724     startup_task_runner_->AddTask(browser_thread_started);
 725
 726     StartupTask pre_main_message_loop_run = base::Bind(
 727         &BrowserMainLoop::PreMainMessageLoopRun, base::Unretained(this));
 728     startup_task_runner_->AddTask(pre_main_message_loop_run);
 729
 730 #if defined(OS_ANDROID)
 731     if (BrowserMayStartAsynchronously()) {
 732       startup_task_runner_->StartRunningTasksAsync();
 733     }
 734 #endif
 735   }
 736 #if defined(OS_ANDROID)
 737   if (!BrowserMayStartAsynchronously()) {
 738     // A second request for asynchronous startup can be ignored, so
 739     // StartupRunningTasksAsync is only called first time through. If, however,
 740     // this is a request for synchronous startup then it must override any
 741     // previous call for async startup, so we call RunAllTasksNow()
 742     // unconditionally.
 743     startup_task_runner_->RunAllTasksNow();
 744   }
 745 #else
 746   startup_task_runner_->RunAllTasksNow();
 747 #endif
 748 }
 749
 750 int BrowserMainLoop::CreateThreads() {
 751   TRACE_EVENT0("startup", "BrowserMainLoop::CreateThreads");
 752   TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::CreateThreads");
 753
 754   base::Thread::Options io_message_loop_options;
 755   io_message_loop_options.message_loop_type = base::MessageLoop::TYPE_IO;
 756   base::Thread::Options ui_message_loop_options;
 757   ui_message_loop_options.message_loop_type = base::MessageLoop::TYPE_UI;
 758
 759   // Start threads in the order they occur in the BrowserThread::ID
 760   // enumeration, except for BrowserThread::UI which is the main
 761   // thread.
 762   //
 763   // Must be size_t so we can increment it.
 764   for (size_t thread_id = BrowserThread::UI + 1;
 765        thread_id < BrowserThread::ID_COUNT;
 766        ++thread_id) {
 767     scoped_ptr<BrowserProcessSubThread>* thread_to_start = NULL;
 768     base::Thread::Options options;
 769
 770     switch (thread_id) {
 771       case BrowserThread::DB:
 772         TRACE_EVENT_BEGIN1("startup",
 773             "BrowserMainLoop::CreateThreads:start",
 774             "Thread", "BrowserThread::DB");
 775         thread_to_start = &db_thread_;
 776         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 777         break;
 778       case BrowserThread::FILE_USER_BLOCKING:
 779         TRACE_EVENT_BEGIN1("startup",
 780             "BrowserMainLoop::CreateThreads:start",
 781             "Thread", "BrowserThread::FILE_USER_BLOCKING");
 782         thread_to_start = &file_user_blocking_thread_;
 783         break;
 784       case BrowserThread::FILE:
 785         TRACE_EVENT_BEGIN1("startup",
 786             "BrowserMainLoop::CreateThreads:start",
 787             "Thread", "BrowserThread::FILE");
 788         thread_to_start = &file_thread_;
 789 #if defined(OS_WIN)
 790         // On Windows, the FILE thread needs to be have a UI message loop
 791         // which pumps messages in such a way that Google Update can
 792         // communicate back to us.
 793         options = ui_message_loop_options;
 794 #else
 795         options = io_message_loop_options;
 796 #endif
 797         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 798         break;
 799       case BrowserThread::PROCESS_LAUNCHER:
 800         TRACE_EVENT_BEGIN1("startup",
 801             "BrowserMainLoop::CreateThreads:start",
 802             "Thread", "BrowserThread::PROCESS_LAUNCHER");
 803         thread_to_start = &process_launcher_thread_;
 804         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 805         break;
 806       case BrowserThread::CACHE:
 807         TRACE_EVENT_BEGIN1("startup",
 808             "BrowserMainLoop::CreateThreads:start",
 809             "Thread", "BrowserThread::CACHE");
 810         thread_to_start = &cache_thread_;
 811         options = io_message_loop_options;
 812         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 813         break;
 814       case BrowserThread::IO:
 815         TRACE_EVENT_BEGIN1("startup",
 816             "BrowserMainLoop::CreateThreads:start",
 817             "Thread", "BrowserThread::IO");
 818         thread_to_start = &io_thread_;
 819         options = io_message_loop_options;
 820         break;
 821       case BrowserThread::UI:
 822       case BrowserThread::ID_COUNT:
 823       default:
 824         NOTREACHED();
 825         break;
 826     }
 827
 828     BrowserThread::ID id = static_cast<BrowserThread::ID>(thread_id);
 829
 830     if (thread_to_start) {
 831       (*thread_to_start).reset(new BrowserProcessSubThread(id));
 832       if (!(*thread_to_start)->StartWithOptions(options)) {
 833         LOG(FATAL) << "Failed to start the browser thread: id == " << id;
 834       }
 835     } else {
 836       NOTREACHED();
 837     }
 838
 839     TRACE_EVENT_END0("startup", "BrowserMainLoop::CreateThreads:start");
 840   }
 841   created_threads_ = true;
 842   return result_code_;
 843 }
 844
 845 int BrowserMainLoop::PreMainMessageLoopRun() {
 846   if (parts_) {
 847     TRACE_EVENT0("startup",
 848         "BrowserMainLoop::CreateThreads:PreMainMessageLoopRun");
 849     TRACK_SCOPED_REGION(
 850         "Startup", "BrowserMainLoop::PreMainMessageLoopRun");
 851
 852     parts_->PreMainMessageLoopRun();
 853   }
 854
 855   // If the UI thread blocks, the whole UI is unresponsive.
 856   // Do not allow disk IO from the UI thread.
 857   base::ThreadRestrictions::SetIOAllowed(false);
 858   base::ThreadRestrictions::DisallowWaiting();
 859   return result_code_;
 860 }
 861
 862 void BrowserMainLoop::RunMainMessageLoopParts() {
 863   TRACE_EVENT_BEGIN_ETW("BrowserMain:MESSAGE_LOOP", 0, "");
 864
 865   bool ran_main_loop = false;
 866   if (parts_)
 867     ran_main_loop = parts_->MainMessageLoopRun(&result_code_);
 868
 869   if (!ran_main_loop)
 870     MainMessageLoopRun();
 871
 872   TRACE_EVENT_END_ETW("BrowserMain:MESSAGE_LOOP", 0, "");
 873 }
 874
 875 void BrowserMainLoop::ShutdownThreadsAndCleanUp() {
 876   if (!created_threads_) {
 877     // Called early, nothing to do
 878     return;
 879   }
 880   TRACE_EVENT0("shutdown", "BrowserMainLoop::ShutdownThreadsAndCleanUp");
 881
 882   // Teardown may start in PostMainMessageLoopRun, and during teardown we
 883   // need to be able to perform IO.
 884   base::ThreadRestrictions::SetIOAllowed(true);
 885   BrowserThread::PostTask(
 886       BrowserThread::IO, FROM_HERE,
 887       base::Bind(base::IgnoreResult(&base::ThreadRestrictions::SetIOAllowed),
 888                  true));
 889
 890 #if !defined(OS_IOS)
 891   if (RenderProcessHost::run_renderer_in_process())
 892     RenderProcessHostImpl::ShutDownInProcessRenderer();
 893 #endif
 894
 895   if (parts_) {
 896     TRACE_EVENT0("shutdown",
 897                  "BrowserMainLoop::Subsystem:PostMainMessageLoopRun");
 898     parts_->PostMainMessageLoopRun();
 899   }
 900
 901   trace_memory_controller_.reset();
 902   system_stats_monitor_.reset();
 903
 904 #if !defined(OS_IOS)
 905   // Destroying the GpuProcessHostUIShims on the UI thread posts a task to
 906   // delete related objects on the GPU thread. This must be done before
 907   // stopping the GPU thread. The GPU thread will close IPC channels to renderer
 908   // processes so this has to happen before stopping the IO thread.
 909   {
 910     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:GPUProcessHostShim");
 911     GpuProcessHostUIShim::DestroyAll();
 912   }
 913   // Cancel pending requests and prevent new requests.
 914   if (resource_dispatcher_host_) {
 915     TRACE_EVENT0("shutdown",
 916                  "BrowserMainLoop::Subsystem:ResourceDispatcherHost");
 917     resource_dispatcher_host_.get()->Shutdown();
 918   }
 919
 920 #if defined(OS_CHROMEOS) || defined(OS_MACOSX)
 921   memory_pressure_monitor_.reset();
 922 #endif
 923
 924 #if defined(OS_MACOSX)
 925   BrowserCompositorMac::DisableRecyclingForShutdown();
 926 #endif
 927
 928 #if defined(USE_AURA) || defined(OS_MACOSX)
 929   {
 930     TRACE_EVENT0("shutdown",
 931                  "BrowserMainLoop::Subsystem:ImageTransportFactory");
 932     ImageTransportFactory::Terminate();
 933   }
 934 #endif
 935
 936 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 937   ZygoteHostImpl::GetInstance()->TearDownAfterLastChild();
 938 #endif  // defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 939
 940   // The device monitors are using |system_monitor_| as dependency, so delete
 941   // them before |system_monitor_| goes away.
 942   // On Mac and windows, the monitor needs to be destroyed on the same thread
 943   // as they were created. On Linux, the monitor will be deleted when IO thread
 944   // goes away.
 945 #if defined(OS_WIN)
 946   system_message_window_.reset();
 947 #elif defined(OS_MACOSX)
 948   device_monitor_mac_.reset();
 949 #endif
 950 #endif  // !defined(OS_IOS)
 951
 952   // Must be size_t so we can subtract from it.
 953   for (size_t thread_id = BrowserThread::ID_COUNT - 1;
 954        thread_id >= (BrowserThread::UI + 1);
 955        --thread_id) {
 956     // Find the thread object we want to stop. Looping over all valid
 957     // BrowserThread IDs and DCHECKing on a missing case in the switch
 958     // statement helps avoid a mismatch between this code and the
 959     // BrowserThread::ID enumeration.
 960     //
 961     // The destruction order is the reverse order of occurrence in the
 962     // BrowserThread::ID list. The rationale for the order is as
 963     // follows (need to be filled in a bit):
 964     //
 965     //
 966     // - The IO thread is the only user of the CACHE thread.
 967     //
 968     // - The PROCESS_LAUNCHER thread must be stopped after IO in case
 969     //   the IO thread posted a task to terminate a process on the
 970     //   process launcher thread.
 971     //
 972     // - (Not sure why DB stops last.)
 973     switch (thread_id) {
 974       case BrowserThread::DB: {
 975         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:DBThread");
 976         ResetThread_DB(db_thread_.Pass());
 977         break;
 978       }
 979       case BrowserThread::FILE: {
 980         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:FileThread");
 981 #if !defined(OS_IOS)
 982         // Clean up state that lives on or uses the file_thread_ before
 983         // it goes away.
 984         if (resource_dispatcher_host_)
 985           resource_dispatcher_host_.get()->save_file_manager()->Shutdown();
 986 #endif  // !defined(OS_IOS)
 987         ResetThread_FILE(file_thread_.Pass());
 988         break;
 989       }
 990       case BrowserThread::FILE_USER_BLOCKING: {
 991         TRACE_EVENT0("shutdown",
 992                       "BrowserMainLoop::Subsystem:FileUserBlockingThread");
 993         ResetThread_FILE_USER_BLOCKING(file_user_blocking_thread_.Pass());
 994         break;
 995       }
 996       case BrowserThread::PROCESS_LAUNCHER: {
 997         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:LauncherThread");
 998         ResetThread_PROCESS_LAUNCHER(process_launcher_thread_.Pass());
 999         break;
1000       }
1001       case BrowserThread::CACHE: {
1002         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:CacheThread");
1003         ResetThread_CACHE(cache_thread_.Pass());
1004         break;
1005       }
1006       case BrowserThread::IO: {
1007         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:IOThread");
1008         ResetThread_IO(io_thread_.Pass());
1009         break;
1010       }
1011       case BrowserThread::UI:
1012       case BrowserThread::ID_COUNT:
1013       default:
1014         NOTREACHED();
1015         break;
1016     }
1017   }
1018
1019 #if !defined(OS_IOS)
1020   {
1021     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:IndexedDBThread");
1022     ResetThread_IndexedDb(indexed_db_thread_.Pass());
1023   }
1024 #endif
1025
1026   // Close the blocking I/O pool after the other threads. Other threads such
1027   // as the I/O thread may need to schedule work like closing files or flushing
1028   // data during shutdown, so the blocking pool needs to be available. There
1029   // may also be slow operations pending that will blcok shutdown, so closing
1030   // it here (which will block until required operations are complete) gives
1031   // more head start for those operations to finish.
1032   {
1033     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:ThreadPool");
1034     BrowserThreadImpl::ShutdownThreadPool();
1035   }
1036
1037 #if !defined(OS_IOS)
1038   // Must happen after the IO thread is shutdown since this may be accessed from
1039   // it.
1040   {
1041     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:GPUChannelFactory");
1042     if (BrowserGpuChannelHostFactory::instance())
1043       BrowserGpuChannelHostFactory::Terminate();
1044   }
1045
1046   // Must happen after the I/O thread is shutdown since this class lives on the
1047   // I/O thread and isn't threadsafe.
1048   {
1049     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:GamepadService");
1050     GamepadService::GetInstance()->Terminate();
1051   }
1052   {
1053     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:SensorService");
1054     DeviceInertialSensorService::GetInstance()->Shutdown();
1055   }
1056   {
1057     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:BatteryStatusService");
1058     device::BatteryStatusService::GetInstance()->Shutdown();
1059   }
1060   {
1061     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:DeleteDataSources");
1062     URLDataManager::DeleteDataSources();
1063   }
1064 #endif  // !defined(OS_IOS)
1065
1066   if (parts_) {
1067     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:PostDestroyThreads");
1068     parts_->PostDestroyThreads();
1069   }
1070 }
1071
1072 void BrowserMainLoop::StopStartupTracingTimer() {
1073   startup_trace_timer_.Stop();
1074 }
1075
1076 void BrowserMainLoop::InitializeMainThread() {
1077   TRACE_EVENT0("startup", "BrowserMainLoop::InitializeMainThread");
1078   const char* kThreadName = "CrBrowserMain";
1079   base::PlatformThread::SetName(kThreadName);
1080   if (main_message_loop_)
1081     main_message_loop_->set_thread_name(kThreadName);
1082
1083   // Register the main thread by instantiating it, but don't call any methods.
1084   main_thread_.reset(
1085       new BrowserThreadImpl(BrowserThread::UI, base::MessageLoop::current()));
1086 }
1087
1088 int BrowserMainLoop::BrowserThreadsStarted() {
1089   TRACE_EVENT0("startup", "BrowserMainLoop::BrowserThreadsStarted");
1090
1091 #if !defined(OS_IOS)
1092   indexed_db_thread_.reset(new base::Thread("IndexedDB"));
1093   indexed_db_thread_->Start();
1094 #endif
1095
1096 #if !defined(OS_IOS)
1097   HistogramSynchronizer::GetInstance();
1098
1099
1100   // GpuDataManager for in-process initialized in PreCreateThreads.
1101   bool initialize_gpu_data_manager = !UsingInProcessGpu();
1102 #if defined(OS_ANDROID)
1103   // Up the priority of anything that touches with display tasks
1104   // (this thread is UI thread, and io_thread_ is for IPCs).
1105   io_thread_->SetPriority(base::ThreadPriority::DISPLAY);
1106   base::PlatformThread::SetThreadPriority(base::PlatformThread::CurrentHandle(),
1107                                           base::ThreadPriority::DISPLAY);
1108
1109   // On Android, GLSurface::InitializeOneOff() must be called before
1110   // initalizing the GpuDataManagerImpl as it uses the GL bindings.
1111   // TODO(sievers): Shouldn't need to init full bindings to determine GL
1112   // version/vendor strings. crbug.com/326295
1113   if (initialize_gpu_data_manager) {
1114     // Note InitializeOneOff is not safe either for in-process gpu after
1115     // creating threads, since it may race with the gpu thread.
1116     if (!gfx::GLSurface::InitializeOneOff()) {
1117       LOG(FATAL) << "GLSurface::InitializeOneOff failed";
1118     }
1119   }
1120 #endif
1121
1122   if (initialize_gpu_data_manager)
1123     GpuDataManagerImpl::GetInstance()->Initialize();
1124
1125   bool always_uses_gpu = true;
1126   bool established_gpu_channel = false;
1127 #if defined(USE_AURA) || defined(OS_MACOSX)
1128   established_gpu_channel = true;
1129   if (!GpuDataManagerImpl::GetInstance()->CanUseGpuBrowserCompositor() ||
1130       parsed_command_line_.HasSwitch(switches::kDisableGpuEarlyInit)) {
1131     established_gpu_channel = always_uses_gpu = false;
1132   }
1133   BrowserGpuChannelHostFactory::Initialize(established_gpu_channel);
1134   ImageTransportFactory::Initialize();
1135 #if defined(USE_AURA)
1136   if (aura::Env::GetInstance()) {
1137     aura::Env::GetInstance()->set_context_factory(GetContextFactory());
1138   }
1139 #endif
1140 #elif defined(OS_ANDROID)
1141   // TODO(crbug.com/439322): This should be set to |true|.
1142   established_gpu_channel = false;
1143   BrowserGpuChannelHostFactory::Initialize(established_gpu_channel);
1144 #endif
1145
1146   // Enable the GpuMemoryBuffer dump provider with IO thread affinity. Note that
1147   // unregistration happens on the IO thread (See
1148   // BrowserProcessSubThread::IOThreadPreCleanUp).
1149   base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(
1150       BrowserGpuMemoryBufferManager::current(), io_thread_->task_runner());
1151
1152   {
1153     TRACE_EVENT0("startup", "BrowserThreadsStarted::Subsystem:AudioMan");
1154     audio_manager_.reset(media::AudioManager::CreateWithHangTimer(
1155         MediaInternals::GetInstance(), io_thread_->task_runner()));
1156   }
1157
1158   {
1159     TRACE_EVENT0("startup", "BrowserThreadsStarted::Subsystem:MidiManager");
1160     midi_manager_.reset(media::midi::MidiManager::Create());
1161   }
1162
1163 #if defined(OS_LINUX) && defined(USE_UDEV)
1164   device_monitor_linux_.reset(new DeviceMonitorLinux());
1165 #elif defined(OS_MACOSX)
1166   device_monitor_mac_.reset(new DeviceMonitorMac());
1167 #endif
1168
1169 #if defined(OS_WIN)
1170   UMA_HISTOGRAM_BOOLEAN("Windows.Win32kRendererLockdown",
1171                         IsWin32kRendererLockdownEnabled());
1172 #endif
1173   // RDH needs the IO thread to be created
1174   {
1175     TRACE_EVENT0("startup",
1176       "BrowserMainLoop::BrowserThreadsStarted:InitResourceDispatcherHost");
1177     resource_dispatcher_host_.reset(new ResourceDispatcherHostImpl());
1178   }
1179
1180   // MediaStreamManager needs the IO thread to be created.
1181   {
1182     TRACE_EVENT0("startup",
1183       "BrowserMainLoop::BrowserThreadsStarted:InitMediaStreamManager");
1184     media_stream_manager_.reset(new MediaStreamManager(audio_manager_.get()));
1185   }
1186
1187   {
1188     TRACE_EVENT0("startup",
1189       "BrowserMainLoop::BrowserThreadsStarted:InitSpeechRecognition");
1190     speech_recognition_manager_.reset(new SpeechRecognitionManagerImpl(
1191         audio_manager_.get(), media_stream_manager_.get()));
1192   }
1193
1194   {
1195     TRACE_EVENT0(
1196         "startup",
1197         "BrowserMainLoop::BrowserThreadsStarted::InitUserInputMonitor");
1198     user_input_monitor_ = media::UserInputMonitor::Create(
1199         io_thread_->message_loop_proxy(), main_thread_->message_loop_proxy());
1200   }
1201
1202   {
1203     TRACE_EVENT0("startup",
1204                  "BrowserMainLoop::BrowserThreadsStarted::TimeZoneMonitor");
1205     time_zone_monitor_ = TimeZoneMonitor::Create();
1206   }
1207
1208   // Alert the clipboard class to which threads are allowed to access the
1209   // clipboard:
1210   std::vector<base::PlatformThreadId> allowed_clipboard_threads;
1211   // The current thread is the UI thread.
1212   allowed_clipboard_threads.push_back(base::PlatformThread::CurrentId());
1213 #if defined(OS_WIN)
1214   // On Windows, clipboards are also used on the File or IO threads.
1215   allowed_clipboard_threads.push_back(file_thread_->thread_id());
1216   allowed_clipboard_threads.push_back(io_thread_->thread_id());
1217 #endif
1218   ui::Clipboard::SetAllowedThreads(allowed_clipboard_threads);
1219
1220   // When running the GPU thread in-process, avoid optimistically starting it
1221   // since creating the GPU thread races against creation of the one-and-only
1222   // ChildProcess instance which is created by the renderer thread.
1223   if (GpuDataManagerImpl::GetInstance()->GpuAccessAllowed(NULL) &&
1224       !established_gpu_channel &&
1225       always_uses_gpu &&
1226       !UsingInProcessGpu()) {
1227     TRACE_EVENT_INSTANT0("gpu", "Post task to launch GPU process",
1228                          TRACE_EVENT_SCOPE_THREAD);
1229     BrowserThread::PostTask(
1230         BrowserThread::IO, FROM_HERE, base::Bind(
1231             base::IgnoreResult(&GpuProcessHost::Get),
1232             GpuProcessHost::GPU_PROCESS_KIND_SANDBOXED,
1233             CAUSE_FOR_GPU_LAUNCH_BROWSER_STARTUP));
1234   }
1235
1236 #if defined(OS_MACOSX)
1237   ThemeHelperMac::GetInstance();
1238   SystemHotkeyHelperMac::GetInstance()->DeferredLoadSystemHotkeys();
1239   if (ShouldEnableBootstrapSandbox()) {
1240     TRACE_EVENT0("startup",
1241         "BrowserMainLoop::BrowserThreadsStarted:BootstrapSandbox");
1242     CHECK(GetBootstrapSandbox());
1243   }
1244 #endif  // defined(OS_MACOSX)
1245
1246 #endif  // !defined(OS_IOS)
1247
1248   return result_code_;
1249 }
1250
1251 bool BrowserMainLoop::UsingInProcessGpu() const {
1252   return parsed_command_line_.HasSwitch(switches::kSingleProcess) ||
1253          parsed_command_line_.HasSwitch(switches::kInProcessGPU);
1254 }
1255
1256 bool BrowserMainLoop::InitializeToolkit() {
1257   TRACE_EVENT0("startup", "BrowserMainLoop::InitializeToolkit");
1258   TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::InitializeToolkit");
1259
1260   // TODO(evan): this function is rather subtle, due to the variety
1261   // of intersecting ifdefs we have.  To keep it easy to follow, there
1262   // are no #else branches on any #ifs.
1263   // TODO(stevenjb): Move platform specific code into platform specific Parts
1264   // (Need to add InitializeToolkit stage to BrowserParts).
1265   // See also GTK setup in EarlyInitialization, above, and associated comments.
1266
1267 #if defined(OS_WIN)
1268   // Init common control sex.
1269   INITCOMMONCONTROLSEX config;
1270   config.dwSize = sizeof(config);
1271   config.dwICC = ICC_WIN95_CLASSES;
1272   if (!InitCommonControlsEx(&config))
1273     PLOG(FATAL);
1274 #endif
1275
1276 #if defined(USE_AURA)
1277
1278 #if defined(USE_X11)
1279   if (!gfx::GetXDisplay())
1280     return false;
1281 #endif
1282
1283   // Env creates the compositor. Aura widgets need the compositor to be created
1284   // before they can be initialized by the browser.
1285   aura::Env::CreateInstance(true);
1286 #endif  // defined(USE_AURA)
1287
1288   if (parts_)
1289     parts_->ToolkitInitialized();
1290
1291   return true;
1292 }
1293
1294 void BrowserMainLoop::MainMessageLoopRun() {
1295 #if defined(OS_ANDROID)
1296   // Android's main message loop is the Java message loop.
1297   NOTREACHED();
1298 #else
1299   DCHECK(base::MessageLoopForUI::IsCurrent());
1300   if (parameters_.ui_task)
1301     base::MessageLoopForUI::current()->PostTask(FROM_HERE,
1302                                                 *parameters_.ui_task);
1303
1304   base::RunLoop run_loop;
1305   run_loop.Run();
1306 #endif
1307 }
1308
1309 base::FilePath BrowserMainLoop::GetStartupTraceFileName(
1310     const base::CommandLine& command_line) const {
1311   base::FilePath trace_file = command_line.GetSwitchValuePath(
1312       switches::kTraceStartupFile);
1313   // trace_file = "none" means that startup events will show up for the next
1314   // begin/end tracing (via about:tracing or AutomationProxy::BeginTracing/
1315   // EndTracing, for example).
1316   if (trace_file == base::FilePath().AppendASCII("none"))
1317     return trace_file;
1318
1319   if (trace_file.empty()) {
1320 #if defined(OS_ANDROID)
1321     TracingControllerAndroid::GenerateTracingFilePath(&trace_file);
1322 #else
1323     // Default to saving the startup trace into the current dir.
1324     trace_file = base::FilePath().AppendASCII("chrometrace.log");
1325 #endif
1326   }
1327
1328   return trace_file;
1329 }
1330
1331 void BrowserMainLoop::InitStartupTracing(
1332     const base::CommandLine& command_line) {
1333   DCHECK(is_tracing_startup_);
1334
1335   startup_trace_file_ = GetStartupTraceFileName(parsed_command_line_);
1336
1337   std::string delay_str = command_line.GetSwitchValueASCII(
1338       switches::kTraceStartupDuration);
1339   int delay_secs = 5;
1340   if (!delay_str.empty() && !base::StringToInt(delay_str, &delay_secs)) {
1341     DLOG(WARNING) << "Could not parse --" << switches::kTraceStartupDuration
1342         << "=" << delay_str << " defaulting to 5 (secs)";
1343     delay_secs = 5;
1344   }
1345
1346   startup_trace_timer_.Start(FROM_HERE,
1347                              base::TimeDelta::FromSeconds(delay_secs),
1348                              this,
1349                              &BrowserMainLoop::EndStartupTracing);
1350 }
1351
1352 void BrowserMainLoop::EndStartupTracing() {
1353   is_tracing_startup_ = false;
1354   TracingController::GetInstance()->DisableRecording(
1355       TracingController::CreateFileSink(
1356           startup_trace_file_,
1357           base::Bind(OnStoppedStartupTracing, startup_trace_file_)));
1358 }
1359
1360 }  // namespace content