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/location.h"
  10 #include "base/logging.h"
  11 #include "base/memory/memory_pressure_monitor.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/profiler/scoped_profile.h"
  19 #include "base/run_loop.h"
  20 #include "base/single_thread_task_runner.h"
  21 #include "base/strings/string_number_conversions.h"
  22 #include "base/strings/string_split.h"
  23 #include "base/system_monitor/system_monitor.h"
  24 #include "base/thread_task_runner_handle.h"
  25 #include "base/threading/thread_restrictions.h"
  26 #include "base/timer/hi_res_timer_manager.h"
  27 #include "base/trace_event/memory_dump_manager.h"
  28 #include "base/trace_event/trace_event.h"
  29 #include "components/tracing/trace_config_file.h"
  30 #include "components/tracing/tracing_switches.h"
  31 #include "content/browser/browser_thread_impl.h"
  32 #include "content/browser/device_sensors/device_inertial_sensor_service.h"
  33 #include "content/browser/dom_storage/dom_storage_area.h"
  34 #include "content/browser/download/save_file_manager.h"
  35 #include "content/browser/gamepad/gamepad_service.h"
  36 #include "content/browser/gpu/browser_gpu_channel_host_factory.h"
  37 #include "content/browser/gpu/browser_gpu_memory_buffer_manager.h"
  38 #include "content/browser/gpu/compositor_util.h"
  39 #include "content/browser/gpu/gpu_data_manager_impl.h"
  40 #include "content/browser/gpu/gpu_process_host.h"
  41 #include "content/browser/gpu/gpu_process_host_ui_shim.h"
  42 #include "content/browser/histogram_synchronizer.h"
  43 #include "content/browser/loader/resource_dispatcher_host_impl.h"
  44 #include "content/browser/media/media_internals.h"
  45 #include "content/browser/mojo/mojo_shell_context.h"
  46 #include "content/browser/net/browser_online_state_observer.h"
  47 #include "content/browser/renderer_host/media/media_stream_manager.h"
  48 #include "content/browser/speech/speech_recognition_manager_impl.h"
  49 #include "content/browser/startup_task_runner.h"
  50 #include "content/browser/time_zone_monitor.h"
  51 #include "content/browser/webui/content_web_ui_controller_factory.h"
  52 #include "content/browser/webui/url_data_manager.h"
  53 #include "content/common/content_switches_internal.h"
  54 #include "content/common/host_discardable_shared_memory_manager.h"
  55 #include "content/common/host_shared_bitmap_manager.h"
  56 #include "content/public/browser/browser_main_parts.h"
  57 #include "content/public/browser/content_browser_client.h"
  58 #include "content/public/browser/render_process_host.h"
  59 #include "content/public/browser/tracing_controller.h"
  60 #include "content/public/common/content_switches.h"
  61 #include "content/public/common/main_function_params.h"
  62 #include "content/public/common/result_codes.h"
  63 #include "crypto/nss_util.h"
  64 #include "device/battery/battery_status_service.h"
  65 #include "media/audio/audio_manager.h"
  66 #include "media/base/media.h"
  67 #include "media/base/user_input_monitor.h"
  68 #include "media/midi/midi_manager.h"
  69 #include "net/base/network_change_notifier.h"
  70 #include "net/socket/client_socket_factory.h"
  71 #include "net/ssl/ssl_config_service.h"
  72 #include "skia/ext/skia_memory_dump_provider.h"
  73 #include "ui/base/clipboard/clipboard.h"
  74
  75 #if defined(USE_AURA) || (defined(OS_MACOSX) && !defined(OS_IOS))
  76 #include "content/browser/compositor/image_transport_factory.h"
  77 #endif
  78
  79 #if defined(USE_AURA)
  80 #include "content/public/browser/context_factory.h"
  81 #include "ui/aura/env.h"
  82 #endif
  83
  84 #if !defined(OS_IOS)
  85 #include "content/browser/renderer_host/render_process_host_impl.h"
  86 #endif
  87
  88 #if defined(OS_ANDROID)
  89 #include "base/android/jni_android.h"
  90 #include "content/browser/android/browser_startup_controller.h"
  91 #include "content/browser/android/browser_surface_texture_manager.h"
  92 #include "content/browser/android/in_process_surface_texture_manager.h"
  93 #include "content/browser/android/tracing_controller_android.h"
  94 #include "content/browser/screen_orientation/screen_orientation_delegate_android.h"
  95 #include "content/public/browser/screen_orientation_provider.h"
  96 #include "ui/gl/gl_surface.h"
  97 #endif
  98
  99 #if defined(OS_MACOSX)
 100 #include "media/base/mac/avfoundation_glue.h"
 101 #endif
 102
 103 #if defined(OS_MACOSX) && !defined(OS_IOS)
 104 #include "base/memory/memory_pressure_monitor_mac.h"
 105 #include "content/browser/bootstrap_sandbox_mac.h"
 106 #include "content/browser/browser_io_surface_manager_mac.h"
 107 #include "content/browser/cocoa/system_hotkey_helper_mac.h"
 108 #include "content/browser/compositor/browser_compositor_view_mac.h"
 109 #include "content/browser/in_process_io_surface_manager_mac.h"
 110 #include "content/browser/theme_helper_mac.h"
 111 #endif
 112
 113 #if defined(USE_OZONE)
 114 #include "ui/ozone/public/client_native_pixmap_factory.h"
 115 #include "ui/ozone/public/ozone_platform.h"
 116 #endif
 117
 118 #if defined(OS_WIN)
 119 #include <windows.h>
 120 #include <commctrl.h>
 121 #include <shellapi.h>
 122
 123 #include "base/memory/memory_pressure_monitor_win.h"
 124 #include "content/browser/system_message_window_win.h"
 125 #include "content/common/sandbox_win.h"
 126 #include "net/base/winsock_init.h"
 127 #include "ui/base/l10n/l10n_util_win.h"
 128 #endif
 129
 130 #if defined(OS_CHROMEOS)
 131 #include "base/memory/memory_pressure_monitor_chromeos.h"
 132 #include "chromeos/chromeos_switches.h"
 133 #endif
 134
 135 #if defined(USE_GLIB)
 136 #include <glib-object.h>
 137 #endif
 138
 139 #if defined(OS_LINUX) && defined(USE_UDEV)
 140 #include "content/browser/device_monitor_udev.h"
 141 #elif defined(OS_MACOSX) && !defined(OS_IOS)
 142 #include "content/browser/device_monitor_mac.h"
 143 #endif
 144
 145 #if defined(OS_POSIX) && !defined(OS_MACOSX)
 146 #include "content/browser/renderer_host/render_sandbox_host_linux.h"
 147 #include "content/browser/zygote_host/zygote_host_impl_linux.h"
 148 #include "sandbox/linux/suid/client/setuid_sandbox_host.h"
 149 #endif
 150
 151 #if defined(ENABLE_PLUGINS)
 152 #include "content/browser/plugin_service_impl.h"
 153 #endif
 154
 155 #if defined(TCMALLOC_TRACE_MEMORY_SUPPORTED)
 156 #include "third_party/tcmalloc/chromium/src/gperftools/heap-profiler.h"
 157 #endif
 158
 159 #if defined(USE_X11)
 160 #include "ui/gfx/x/x11_connection.h"
 161 #include "ui/gfx/x/x11_types.h"
 162 #endif
 163
 164 // One of the linux specific headers defines this as a macro.
 165 #ifdef DestroyAll
 166 #undef DestroyAll
 167 #endif
 168
 169 namespace content {
 170 namespace {
 171
 172 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 173 void SetupSandbox(const base::CommandLine& parsed_command_line) {
 174   TRACE_EVENT0("startup", "SetupSandbox");
 175   base::FilePath sandbox_binary;
 176
 177   scoped_ptr<sandbox::SetuidSandboxHost> setuid_sandbox_host(
 178       sandbox::SetuidSandboxHost::Create());
 179
 180   const bool want_setuid_sandbox =
 181       !parsed_command_line.HasSwitch(switches::kNoSandbox) &&
 182       !parsed_command_line.HasSwitch(switches::kDisableSetuidSandbox) &&
 183       !setuid_sandbox_host->IsDisabledViaEnvironment();
 184
 185   static const char no_suid_error[] =
 186       "Running without the SUID sandbox! See "
 187       "https://code.google.com/p/chromium/wiki/LinuxSUIDSandboxDevelopment "
 188       "for more information on developing with the sandbox on.";
 189   if (want_setuid_sandbox) {
 190     sandbox_binary = setuid_sandbox_host->GetSandboxBinaryPath();
 191     if (sandbox_binary.empty()) {
 192       // This needs to be fatal. Talk to security@chromium.org if you feel
 193       // otherwise.
 194       LOG(FATAL) << no_suid_error;
 195     }
 196   } else {
 197     LOG(ERROR) << no_suid_error;
 198   }
 199
 200   // Tickle the sandbox host and zygote host so they fork now.
 201   RenderSandboxHostLinux::GetInstance()->Init();
 202   ZygoteHostImpl::GetInstance()->Init(sandbox_binary.value());
 203 }
 204 #endif
 205
 206 #if defined(USE_GLIB)
 207 static void GLibLogHandler(const gchar* log_domain,
 208                            GLogLevelFlags log_level,
 209                            const gchar* message,
 210                            gpointer userdata) {
 211   if (!log_domain)
 212     log_domain = "<unknown>";
 213   if (!message)
 214     message = "<no message>";
 215
 216   if (strstr(message, "Unable to retrieve the file info for")) {
 217     LOG(ERROR) << "GTK File code error: " << message;
 218   } else if (strstr(message, "Could not find the icon") &&
 219              strstr(log_domain, "Gtk")) {
 220     LOG(ERROR) << "GTK icon error: " << message;
 221   } else if (strstr(message, "Theme file for default has no") ||
 222              strstr(message, "Theme directory") ||
 223              strstr(message, "theme pixmap") ||
 224              strstr(message, "locate theme engine")) {
 225     LOG(ERROR) << "GTK theme error: " << message;
 226   } else if (strstr(message, "Unable to create Ubuntu Menu Proxy") &&
 227              strstr(log_domain, "<unknown>")) {
 228     LOG(ERROR) << "GTK menu proxy create failed";
 229   } else if (strstr(message, "Out of memory") &&
 230              strstr(log_domain, "<unknown>")) {
 231     LOG(ERROR) << "DBus call timeout or out of memory: "
 232                << "http://crosbug.com/15496";
 233   } else if (strstr(message, "Could not connect: Connection refused") &&
 234              strstr(log_domain, "<unknown>")) {
 235     LOG(ERROR) << "DConf settings backend could not connect to session bus: "
 236                << "http://crbug.com/179797";
 237   } else if (strstr(message, "Attempting to store changes into") ||
 238              strstr(message, "Attempting to set the permissions of")) {
 239     LOG(ERROR) << message << " (http://bugs.chromium.org/161366)";
 240   } else if (strstr(message, "drawable is not a native X11 window")) {
 241     LOG(ERROR) << message << " (http://bugs.chromium.org/329991)";
 242   } else if (strstr(message, "Cannot do system-bus activation with no user")) {
 243     LOG(ERROR) << message << " (http://crbug.com/431005)";
 244   } else {
 245     LOG(DFATAL) << log_domain << ": " << message;
 246   }
 247 }
 248
 249 static void SetUpGLibLogHandler() {
 250   // Register GLib-handled assertions to go through our logging system.
 251   const char* kLogDomains[] = { NULL, "Gtk", "Gdk", "GLib", "GLib-GObject" };
 252   for (size_t i = 0; i < arraysize(kLogDomains); i++) {
 253     g_log_set_handler(kLogDomains[i],
 254                       static_cast<GLogLevelFlags>(G_LOG_FLAG_RECURSION |
 255                                                   G_LOG_FLAG_FATAL |
 256                                                   G_LOG_LEVEL_ERROR |
 257                                                   G_LOG_LEVEL_CRITICAL |
 258                                                   G_LOG_LEVEL_WARNING),
 259                       GLibLogHandler,
 260                       NULL);
 261   }
 262 }
 263 #endif
 264
 265 void OnStoppedStartupTracing(const base::FilePath& trace_file) {
 266   VLOG(0) << "Completed startup tracing to " << trace_file.value();
 267 }
 268
 269 // Disable optimizations for this block of functions so the compiler doesn't
 270 // merge them all together. This makes it possible to tell what thread was
 271 // unresponsive by inspecting the callstack.
 272 MSVC_DISABLE_OPTIMIZE()
 273 MSVC_PUSH_DISABLE_WARNING(4748)
 274
 275 NOINLINE void ResetThread_DB(scoped_ptr<BrowserProcessSubThread> thread) {
 276   volatile int inhibit_comdat = __LINE__;
 277   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 278   thread.reset();
 279 }
 280
 281 NOINLINE void ResetThread_FILE(scoped_ptr<BrowserProcessSubThread> thread) {
 282   volatile int inhibit_comdat = __LINE__;
 283   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 284   thread.reset();
 285 }
 286
 287 NOINLINE void ResetThread_FILE_USER_BLOCKING(
 288     scoped_ptr<BrowserProcessSubThread> thread) {
 289   volatile int inhibit_comdat = __LINE__;
 290   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 291   thread.reset();
 292 }
 293
 294 NOINLINE void ResetThread_PROCESS_LAUNCHER(
 295     scoped_ptr<BrowserProcessSubThread> thread) {
 296   volatile int inhibit_comdat = __LINE__;
 297   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 298   thread.reset();
 299 }
 300
 301 NOINLINE void ResetThread_CACHE(scoped_ptr<BrowserProcessSubThread> thread) {
 302   volatile int inhibit_comdat = __LINE__;
 303   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 304   thread.reset();
 305 }
 306
 307 NOINLINE void ResetThread_IO(scoped_ptr<BrowserProcessSubThread> thread) {
 308   volatile int inhibit_comdat = __LINE__;
 309   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 310   thread.reset();
 311 }
 312
 313 #if !defined(OS_IOS)
 314 NOINLINE void ResetThread_IndexedDb(scoped_ptr<base::Thread> thread) {
 315   volatile int inhibit_comdat = __LINE__;
 316   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 317   thread.reset();
 318 }
 319 #endif
 320
 321 MSVC_POP_WARNING()
 322 MSVC_ENABLE_OPTIMIZE();
 323
 324 #if defined(OS_WIN)
 325 // Creates a memory pressure monitor using automatic thresholds, or those
 326 // specified on the command-line. Ownership is passed to the caller.
 327 base::win::MemoryPressureMonitor* CreateWinMemoryPressureMonitor(
 328     const base::CommandLine& parsed_command_line) {
 329   std::vector<std::string> thresholds = base::SplitString(
 330       parsed_command_line.GetSwitchValueASCII(
 331           switches::kMemoryPressureThresholdsMb),
 332       ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
 333
 334   int moderate_threshold_mb = 0;
 335   int critical_threshold_mb = 0;
 336   if (thresholds.size() == 2 &&
 337       base::StringToInt(thresholds[0], &moderate_threshold_mb) &&
 338       base::StringToInt(thresholds[1], &critical_threshold_mb) &&
 339       moderate_threshold_mb >= critical_threshold_mb &&
 340       critical_threshold_mb >= 0) {
 341     return new base::win::MemoryPressureMonitor(moderate_threshold_mb,
 342                                                 critical_threshold_mb);
 343   }
 344
 345   // In absence of valid switches use the automatic defaults.
 346   return new base::win::MemoryPressureMonitor();
 347 }
 348 #endif  // defined(OS_WIN)
 349
 350 }  // namespace
 351
 352 // The currently-running BrowserMainLoop.  There can be one or zero.
 353 BrowserMainLoop* g_current_browser_main_loop = NULL;
 354
 355 // For measuring memory usage after each task. Behind a command line flag.
 356 class BrowserMainLoop::MemoryObserver : public base::MessageLoop::TaskObserver {
 357  public:
 358   MemoryObserver() {}
 359   ~MemoryObserver() override {}
 360
 361   void WillProcessTask(const base::PendingTask& pending_task) override {}
 362
 363   void DidProcessTask(const base::PendingTask& pending_task) override {
 364 #if !defined(OS_IOS)  // No ProcessMetrics on IOS.
 365     scoped_ptr<base::ProcessMetrics> process_metrics(
 366         base::ProcessMetrics::CreateProcessMetrics(
 367 #if defined(OS_MACOSX)
 368             base::GetCurrentProcessHandle(), NULL));
 369 #else
 370             base::GetCurrentProcessHandle()));
 371 #endif
 372     size_t private_bytes;
 373     process_metrics->GetMemoryBytes(&private_bytes, NULL);
 374     LOCAL_HISTOGRAM_MEMORY_KB("Memory.BrowserUsed", private_bytes >> 10);
 375 #endif
 376   }
 377  private:
 378   DISALLOW_COPY_AND_ASSIGN(MemoryObserver);
 379 };
 380
 381
 382 // BrowserMainLoop construction / destruction =============================
 383
 384 BrowserMainLoop* BrowserMainLoop::GetInstance() {
 385   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 386   return g_current_browser_main_loop;
 387 }
 388
 389 BrowserMainLoop::BrowserMainLoop(const MainFunctionParams& parameters)
 390     : parameters_(parameters),
 391       parsed_command_line_(parameters.command_line),
 392       result_code_(RESULT_CODE_NORMAL_EXIT),
 393       created_threads_(false),
 394       // ContentMainRunner should have enabled tracing of the browser process
 395       // when kTraceStartup or kTraceConfigFile is in the command line.
 396       is_tracing_startup_for_duration_(
 397           parameters.command_line.HasSwitch(switches::kTraceStartup) ||
 398           (tracing::TraceConfigFile::GetInstance()->IsEnabled() &&
 399            tracing::TraceConfigFile::GetInstance()->GetStartupDuration() > 0)) {
 400   DCHECK(!g_current_browser_main_loop);
 401   g_current_browser_main_loop = this;
 402 }
 403
 404 BrowserMainLoop::~BrowserMainLoop() {
 405   DCHECK_EQ(this, g_current_browser_main_loop);
 406 #if !defined(OS_IOS)
 407   ui::Clipboard::DestroyClipboardForCurrentThread();
 408 #endif  // !defined(OS_IOS)
 409   g_current_browser_main_loop = NULL;
 410 }
 411
 412 void BrowserMainLoop::Init() {
 413   TRACE_EVENT0("startup", "BrowserMainLoop::Init");
 414   TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::Init");
 415
 416   parts_.reset(
 417       GetContentClient()->browser()->CreateBrowserMainParts(parameters_));
 418 }
 419
 420 // BrowserMainLoop stages ==================================================
 421
 422 void BrowserMainLoop::EarlyInitialization() {
 423   TRACE_EVENT0("startup", "BrowserMainLoop::EarlyInitialization");
 424   TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::EarlyInitialization");
 425
 426 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 427   // No thread should be created before this call, as SetupSandbox()
 428   // will end-up using fork().
 429   SetupSandbox(parsed_command_line_);
 430 #endif
 431
 432 #if defined(USE_X11)
 433   if (UsingInProcessGpu()) {
 434     if (!gfx::InitializeThreadedX11()) {
 435       LOG(ERROR) << "Failed to put Xlib into threaded mode.";
 436     }
 437   }
 438 #endif
 439
 440   // GLib's spawning of new processes is buggy, so it's important that at this
 441   // point GLib does not need to start DBUS. Chrome should always start with
 442   // DBUS_SESSION_BUS_ADDRESS properly set. See crbug.com/309093.
 443 #if defined(USE_GLIB)
 444   // g_type_init will be deprecated in 2.36. 2.35 is the development
 445   // version for 2.36, hence do not call g_type_init starting 2.35.
 446   // http://developer.gnome.org/gobject/unstable/gobject-Type-Information.html#g-type-init
 447 #if !GLIB_CHECK_VERSION(2, 35, 0)
 448   // GLib type system initialization. Needed at least for gconf,
 449   // used in net/proxy/proxy_config_service_linux.cc. Most likely
 450   // this is superfluous as gtk_init() ought to do this. It's
 451   // definitely harmless, so retained as a reminder of this
 452   // requirement for gconf.
 453   g_type_init();
 454 #endif
 455
 456   SetUpGLibLogHandler();
 457 #endif
 458
 459   if (parts_)
 460     parts_->PreEarlyInitialization();
 461
 462 #if defined(OS_MACOSX)
 463   // We use quite a few file descriptors for our IPC, and the default limit on
 464   // the Mac is low (256), so bump it up.
 465   base::SetFdLimit(1024);
 466 #endif
 467
 468 #if defined(OS_WIN)
 469   net::EnsureWinsockInit();
 470 #endif
 471
 472 #if defined(USE_NSS_CERTS) || !defined(USE_OPENSSL)
 473   // We want to be sure to init NSPR on the main thread.
 474   crypto::EnsureNSPRInit();
 475 #endif
 476
 477 #if !defined(OS_IOS)
 478   if (parsed_command_line_.HasSwitch(switches::kRendererProcessLimit)) {
 479     std::string limit_string = parsed_command_line_.GetSwitchValueASCII(
 480         switches::kRendererProcessLimit);
 481     size_t process_limit;
 482     if (base::StringToSizeT(limit_string, &process_limit)) {
 483       RenderProcessHost::SetMaxRendererProcessCount(process_limit);
 484     }
 485   }
 486 #endif  // !defined(OS_IOS)
 487
 488   // TODO(boliu): kSingleProcess check is a temporary workaround for
 489   // in-process Android WebView. crbug.com/503724 tracks proper fix.
 490   if (!parsed_command_line_.HasSwitch(switches::kSingleProcess)) {
 491     base::DiscardableMemoryAllocator::SetInstance(
 492         HostDiscardableSharedMemoryManager::current());
 493   }
 494
 495   if (parts_)
 496     parts_->PostEarlyInitialization();
 497 }
 498
 499 void BrowserMainLoop::PreMainMessageLoopStart() {
 500   if (parts_) {
 501     TRACE_EVENT0("startup",
 502         "BrowserMainLoop::MainMessageLoopStart:PreMainMessageLoopStart");
 503     parts_->PreMainMessageLoopStart();
 504   }
 505
 506 #if defined(OS_WIN)
 507   // If we're running tests (ui_task is non-null), then the ResourceBundle
 508   // has already been initialized.
 509   if (!parameters_.ui_task) {
 510     // Override the configured locale with the user's preferred UI language.
 511     l10n_util::OverrideLocaleWithUILanguageList();
 512   }
 513 #endif
 514 }
 515
 516 void BrowserMainLoop::MainMessageLoopStart() {
 517   // DO NOT add more code here. Use PreMainMessageLoopStart() above or
 518   // PostMainMessageLoopStart() below.
 519
 520   TRACE_EVENT0("startup", "BrowserMainLoop::MainMessageLoopStart");
 521   TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::MainMessageLoopStart");
 522
 523   // Create a MessageLoop if one does not already exist for the current thread.
 524   if (!base::MessageLoop::current())
 525     main_message_loop_.reset(new base::MessageLoopForUI);
 526
 527   InitializeMainThread();
 528 }
 529
 530 void BrowserMainLoop::PostMainMessageLoopStart() {
 531   {
 532     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:SystemMonitor");
 533     system_monitor_.reset(new base::SystemMonitor);
 534   }
 535   {
 536     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:PowerMonitor");
 537     scoped_ptr<base::PowerMonitorSource> power_monitor_source(
 538       new base::PowerMonitorDeviceSource());
 539     power_monitor_.reset(new base::PowerMonitor(power_monitor_source.Pass()));
 540   }
 541   {
 542     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:HighResTimerManager");
 543     hi_res_timer_manager_.reset(new base::HighResolutionTimerManager);
 544   }
 545   {
 546     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:NetworkChangeNotifier");
 547     network_change_notifier_.reset(net::NetworkChangeNotifier::Create());
 548   }
 549
 550 #if !defined(OS_IOS)
 551   {
 552     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:MediaFeatures");
 553     media::InitializeMediaLibrary();
 554   }
 555   {
 556     TRACE_EVENT0("startup",
 557                  "BrowserMainLoop::Subsystem:ContentWebUIController");
 558     WebUIControllerFactory::RegisterFactory(
 559         ContentWebUIControllerFactory::GetInstance());
 560   }
 561
 562   {
 563     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:OnlineStateObserver");
 564     online_state_observer_.reset(new BrowserOnlineStateObserver);
 565   }
 566
 567   {
 568     system_stats_monitor_.reset(
 569         new base::trace_event::TraceEventSystemStatsMonitor(
 570             base::ThreadTaskRunnerHandle::Get()));
 571   }
 572 #endif  // !defined(OS_IOS)
 573
 574 #if defined(OS_WIN)
 575   system_message_window_.reset(new SystemMessageWindowWin);
 576 #endif
 577
 578   if (parts_)
 579     parts_->PostMainMessageLoopStart();
 580
 581 #if !defined(OS_IOS)
 582   // Start tracing to a file if needed. Only do this after starting the main
 583   // message loop to avoid calling MessagePumpForUI::ScheduleWork() before
 584   // MessagePumpForUI::Start() as it will crash the browser.
 585   if (is_tracing_startup_for_duration_) {
 586     TRACE_EVENT0("startup", "BrowserMainLoop::InitStartupTracingForDuration");
 587     InitStartupTracingForDuration(parsed_command_line_);
 588   }
 589 #endif  // !defined(OS_IOS)
 590
 591 #if defined(OS_ANDROID)
 592   {
 593     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:SurfaceTextureManager");
 594     if (parsed_command_line_.HasSwitch(switches::kSingleProcess)) {
 595       SurfaceTextureManager::SetInstance(
 596           InProcessSurfaceTextureManager::GetInstance());
 597     } else {
 598       SurfaceTextureManager::SetInstance(
 599           BrowserSurfaceTextureManager::GetInstance());
 600     }
 601   }
 602
 603   if (!parsed_command_line_.HasSwitch(
 604       switches::kDisableScreenOrientationLock)) {
 605     TRACE_EVENT0("startup",
 606                  "BrowserMainLoop::Subsystem:ScreenOrientationProvider");
 607     screen_orientation_delegate_.reset(
 608         new ScreenOrientationDelegateAndroid());
 609     ScreenOrientationProvider::SetDelegate(screen_orientation_delegate_.get());
 610   }
 611 #endif
 612
 613 #if defined(OS_MACOSX) && !defined(OS_IOS)
 614   {
 615     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:IOSurfaceManager");
 616     if (parsed_command_line_.HasSwitch(switches::kSingleProcess)) {
 617       IOSurfaceManager::SetInstance(InProcessIOSurfaceManager::GetInstance());
 618     } else {
 619       IOSurfaceManager::SetInstance(BrowserIOSurfaceManager::GetInstance());
 620     }
 621   }
 622 #endif
 623
 624 #if defined(USE_OZONE)
 625   client_native_pixmap_factory_ = ui::ClientNativePixmapFactory::Create();
 626   ui::ClientNativePixmapFactory::SetInstance(
 627       client_native_pixmap_factory_.get());
 628   ui::ClientNativePixmapFactory::GetInstance()->Initialize(
 629       ui::OzonePlatform::GetInstance()->OpenClientNativePixmapDevice());
 630 #endif
 631
 632   if (parsed_command_line_.HasSwitch(switches::kMemoryMetrics)) {
 633     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:MemoryObserver");
 634     memory_observer_.reset(new MemoryObserver());
 635     base::MessageLoop::current()->AddTaskObserver(memory_observer_.get());
 636   }
 637
 638   if (parsed_command_line_.HasSwitch(
 639           switches::kEnableAggressiveDOMStorageFlushing)) {
 640     TRACE_EVENT0("startup",
 641                  "BrowserMainLoop::Subsystem:EnableAggressiveCommitDelay");
 642     DOMStorageArea::EnableAggressiveCommitDelay();
 643   }
 644
 645   base::trace_event::MemoryDumpManager::GetInstance()->Initialize();
 646
 647   // Enable the dump providers.
 648   base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(
 649       HostSharedBitmapManager::current());
 650   base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(
 651       skia::SkiaMemoryDumpProvider::GetInstance());
 652
 653 #if defined(TCMALLOC_TRACE_MEMORY_SUPPORTED)
 654   trace_memory_controller_.reset(new base::trace_event::TraceMemoryController(
 655       base::MessageLoop::current()->task_runner(),
 656       ::HeapProfilerWithPseudoStackStart, ::HeapProfilerStop,
 657       ::GetHeapProfile));
 658 #endif
 659 }
 660
 661 int BrowserMainLoop::PreCreateThreads() {
 662   if (parts_) {
 663     TRACE_EVENT0("startup",
 664         "BrowserMainLoop::CreateThreads:PreCreateThreads");
 665     TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::PreCreateThreads");
 666
 667     result_code_ = parts_->PreCreateThreads();
 668   }
 669
 670   // TODO(chrisha): Abstract away this construction mess to a helper function,
 671   // once MemoryPressureMonitor is made a concrete class.
 672 #if defined(OS_CHROMEOS)
 673   if (chromeos::switches::MemoryPressureHandlingEnabled()) {
 674     memory_pressure_monitor_.reset(new base::chromeos::MemoryPressureMonitor(
 675         chromeos::switches::GetMemoryPressureThresholds()));
 676   }
 677 #elif defined(OS_MACOSX) && !defined(OS_IOS)
 678   memory_pressure_monitor_.reset(new base::mac::MemoryPressureMonitor());
 679 #elif defined(OS_WIN)
 680   memory_pressure_monitor_.reset(CreateWinMemoryPressureMonitor(
 681       parsed_command_line_));
 682 #endif
 683
 684 #if defined(ENABLE_PLUGINS)
 685   // Prior to any processing happening on the io thread, we create the
 686   // plugin service as it is predominantly used from the io thread,
 687   // but must be created on the main thread. The service ctor is
 688   // inexpensive and does not invoke the io_thread() accessor.
 689   {
 690     TRACE_EVENT0("startup", "BrowserMainLoop::CreateThreads:PluginService");
 691     PluginService::GetInstance()->Init();
 692   }
 693 #endif
 694
 695 #if defined(OS_MACOSX)
 696   {
 697     // Initialize AVFoundation if supported, for audio and video.
 698     TRACE_EVENT0("startup",
 699                  "BrowserMainLoop::CreateThreads:InitializeAVFoundation");
 700     AVFoundationGlue::InitializeAVFoundation();
 701   }
 702 #endif
 703
 704   // 1) Need to initialize in-process GpuDataManager before creating threads.
 705   // It's unsafe to append the gpu command line switches to the global
 706   // CommandLine::ForCurrentProcess object after threads are created.
 707   // 2) Must be after parts_->PreCreateThreads to pick up chrome://flags.
 708   GpuDataManagerImpl::GetInstance()->Initialize();
 709
 710 #if !defined(OS_IOS) && (!defined(GOOGLE_CHROME_BUILD) || defined(OS_ANDROID))
 711   // Single-process is an unsupported and not fully tested mode, so
 712   // don't enable it for official Chrome builds (except on Android).
 713   if (parsed_command_line_.HasSwitch(switches::kSingleProcess))
 714     RenderProcessHost::SetRunRendererInProcess(true);
 715 #endif
 716
 717   return result_code_;
 718 }
 719
 720 void BrowserMainLoop::CreateStartupTasks() {
 721   TRACE_EVENT0("startup", "BrowserMainLoop::CreateStartupTasks");
 722   TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::CreateStartupTasks");
 723
 724   // First time through, we really want to create all the tasks
 725   if (!startup_task_runner_.get()) {
 726 #if defined(OS_ANDROID)
 727     startup_task_runner_ = make_scoped_ptr(
 728         new StartupTaskRunner(base::Bind(&BrowserStartupComplete),
 729                               base::ThreadTaskRunnerHandle::Get()));
 730 #else
 731     startup_task_runner_ = make_scoped_ptr(
 732         new StartupTaskRunner(base::Callback<void(int)>(),
 733                               base::ThreadTaskRunnerHandle::Get()));
 734 #endif
 735     StartupTask pre_create_threads =
 736         base::Bind(&BrowserMainLoop::PreCreateThreads, base::Unretained(this));
 737     startup_task_runner_->AddTask(pre_create_threads);
 738
 739     StartupTask create_threads =
 740         base::Bind(&BrowserMainLoop::CreateThreads, base::Unretained(this));
 741     startup_task_runner_->AddTask(create_threads);
 742
 743     StartupTask browser_thread_started = base::Bind(
 744         &BrowserMainLoop::BrowserThreadsStarted, base::Unretained(this));
 745     startup_task_runner_->AddTask(browser_thread_started);
 746
 747     StartupTask pre_main_message_loop_run = base::Bind(
 748         &BrowserMainLoop::PreMainMessageLoopRun, base::Unretained(this));
 749     startup_task_runner_->AddTask(pre_main_message_loop_run);
 750
 751 #if defined(OS_ANDROID)
 752     if (BrowserMayStartAsynchronously()) {
 753       startup_task_runner_->StartRunningTasksAsync();
 754     }
 755 #endif
 756   }
 757 #if defined(OS_ANDROID)
 758   if (!BrowserMayStartAsynchronously()) {
 759     // A second request for asynchronous startup can be ignored, so
 760     // StartupRunningTasksAsync is only called first time through. If, however,
 761     // this is a request for synchronous startup then it must override any
 762     // previous call for async startup, so we call RunAllTasksNow()
 763     // unconditionally.
 764     startup_task_runner_->RunAllTasksNow();
 765   }
 766 #else
 767   startup_task_runner_->RunAllTasksNow();
 768 #endif
 769 }
 770
 771 int BrowserMainLoop::CreateThreads() {
 772   TRACE_EVENT0("startup", "BrowserMainLoop::CreateThreads");
 773   TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::CreateThreads");
 774
 775   base::Thread::Options io_message_loop_options;
 776   io_message_loop_options.message_loop_type = base::MessageLoop::TYPE_IO;
 777   base::Thread::Options ui_message_loop_options;
 778   ui_message_loop_options.message_loop_type = base::MessageLoop::TYPE_UI;
 779
 780   // Start threads in the order they occur in the BrowserThread::ID
 781   // enumeration, except for BrowserThread::UI which is the main
 782   // thread.
 783   //
 784   // Must be size_t so we can increment it.
 785   for (size_t thread_id = BrowserThread::UI + 1;
 786        thread_id < BrowserThread::ID_COUNT;
 787        ++thread_id) {
 788     scoped_ptr<BrowserProcessSubThread>* thread_to_start = NULL;
 789     base::Thread::Options options;
 790
 791     switch (thread_id) {
 792       case BrowserThread::DB:
 793         TRACE_EVENT_BEGIN1("startup",
 794             "BrowserMainLoop::CreateThreads:start",
 795             "Thread", "BrowserThread::DB");
 796         thread_to_start = &db_thread_;
 797         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 798         break;
 799       case BrowserThread::FILE_USER_BLOCKING:
 800         TRACE_EVENT_BEGIN1("startup",
 801             "BrowserMainLoop::CreateThreads:start",
 802             "Thread", "BrowserThread::FILE_USER_BLOCKING");
 803         thread_to_start = &file_user_blocking_thread_;
 804         break;
 805       case BrowserThread::FILE:
 806         TRACE_EVENT_BEGIN1("startup",
 807             "BrowserMainLoop::CreateThreads:start",
 808             "Thread", "BrowserThread::FILE");
 809         thread_to_start = &file_thread_;
 810 #if defined(OS_WIN)
 811         // On Windows, the FILE thread needs to be have a UI message loop
 812         // which pumps messages in such a way that Google Update can
 813         // communicate back to us.
 814         options = ui_message_loop_options;
 815 #else
 816         options = io_message_loop_options;
 817 #endif
 818         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 819         break;
 820       case BrowserThread::PROCESS_LAUNCHER:
 821         TRACE_EVENT_BEGIN1("startup",
 822             "BrowserMainLoop::CreateThreads:start",
 823             "Thread", "BrowserThread::PROCESS_LAUNCHER");
 824         thread_to_start = &process_launcher_thread_;
 825         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 826         break;
 827       case BrowserThread::CACHE:
 828         TRACE_EVENT_BEGIN1("startup",
 829             "BrowserMainLoop::CreateThreads:start",
 830             "Thread", "BrowserThread::CACHE");
 831         thread_to_start = &cache_thread_;
 832         options = io_message_loop_options;
 833         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 834         break;
 835       case BrowserThread::IO:
 836         TRACE_EVENT_BEGIN1("startup",
 837             "BrowserMainLoop::CreateThreads:start",
 838             "Thread", "BrowserThread::IO");
 839         thread_to_start = &io_thread_;
 840         options = io_message_loop_options;
 841 #if defined(OS_ANDROID)
 842         // Up the priority of the |io_thread_| as some of its IPCs relate to
 843         // display tasks.
 844         options.priority = base::ThreadPriority::DISPLAY;
 845 #endif
 846         break;
 847       case BrowserThread::UI:
 848       case BrowserThread::ID_COUNT:
 849       default:
 850         NOTREACHED();
 851         break;
 852     }
 853
 854     BrowserThread::ID id = static_cast<BrowserThread::ID>(thread_id);
 855
 856     if (thread_to_start) {
 857       (*thread_to_start).reset(new BrowserProcessSubThread(id));
 858       if (!(*thread_to_start)->StartWithOptions(options)) {
 859         LOG(FATAL) << "Failed to start the browser thread: id == " << id;
 860       }
 861     } else {
 862       NOTREACHED();
 863     }
 864
 865     TRACE_EVENT_END0("startup", "BrowserMainLoop::CreateThreads:start");
 866   }
 867   created_threads_ = true;
 868   return result_code_;
 869 }
 870
 871 int BrowserMainLoop::PreMainMessageLoopRun() {
 872   if (parts_) {
 873     TRACE_EVENT0("startup",
 874         "BrowserMainLoop::CreateThreads:PreMainMessageLoopRun");
 875     TRACK_SCOPED_REGION(
 876         "Startup", "BrowserMainLoop::PreMainMessageLoopRun");
 877
 878     parts_->PreMainMessageLoopRun();
 879   }
 880
 881   // If the UI thread blocks, the whole UI is unresponsive.
 882   // Do not allow disk IO from the UI thread.
 883   base::ThreadRestrictions::SetIOAllowed(false);
 884   base::ThreadRestrictions::DisallowWaiting();
 885   return result_code_;
 886 }
 887
 888 void BrowserMainLoop::RunMainMessageLoopParts() {
 889   TRACE_EVENT_BEGIN_ETW("BrowserMain:MESSAGE_LOOP", 0, "");
 890
 891   bool ran_main_loop = false;
 892   if (parts_)
 893     ran_main_loop = parts_->MainMessageLoopRun(&result_code_);
 894
 895   if (!ran_main_loop)
 896     MainMessageLoopRun();
 897
 898   TRACE_EVENT_END_ETW("BrowserMain:MESSAGE_LOOP", 0, "");
 899 }
 900
 901 void BrowserMainLoop::ShutdownThreadsAndCleanUp() {
 902   if (!created_threads_) {
 903     // Called early, nothing to do
 904     return;
 905   }
 906   TRACE_EVENT0("shutdown", "BrowserMainLoop::ShutdownThreadsAndCleanUp");
 907
 908   // Teardown may start in PostMainMessageLoopRun, and during teardown we
 909   // need to be able to perform IO.
 910   base::ThreadRestrictions::SetIOAllowed(true);
 911   BrowserThread::PostTask(
 912       BrowserThread::IO, FROM_HERE,
 913       base::Bind(base::IgnoreResult(&base::ThreadRestrictions::SetIOAllowed),
 914                  true));
 915
 916   mojo_shell_context_.reset();
 917
 918 #if !defined(OS_IOS)
 919   if (RenderProcessHost::run_renderer_in_process())
 920     RenderProcessHostImpl::ShutDownInProcessRenderer();
 921 #endif
 922
 923   if (parts_) {
 924     TRACE_EVENT0("shutdown",
 925                  "BrowserMainLoop::Subsystem:PostMainMessageLoopRun");
 926     parts_->PostMainMessageLoopRun();
 927   }
 928
 929 #if defined(USE_AURA)
 930   aura::Env::DeleteInstance();
 931 #endif
 932
 933   trace_memory_controller_.reset();
 934   system_stats_monitor_.reset();
 935
 936 #if !defined(OS_IOS)
 937   // Destroying the GpuProcessHostUIShims on the UI thread posts a task to
 938   // delete related objects on the GPU thread. This must be done before
 939   // stopping the GPU thread. The GPU thread will close IPC channels to renderer
 940   // processes so this has to happen before stopping the IO thread.
 941   {
 942     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:GPUProcessHostShim");
 943     GpuProcessHostUIShim::DestroyAll();
 944   }
 945   // Cancel pending requests and prevent new requests.
 946   if (resource_dispatcher_host_) {
 947     TRACE_EVENT0("shutdown",
 948                  "BrowserMainLoop::Subsystem:ResourceDispatcherHost");
 949     resource_dispatcher_host_.get()->Shutdown();
 950   }
 951
 952   memory_pressure_monitor_.reset();
 953
 954 #if defined(OS_MACOSX)
 955   BrowserCompositorMac::DisableRecyclingForShutdown();
 956 #endif
 957
 958 #if defined(USE_AURA) || defined(OS_MACOSX)
 959   {
 960     TRACE_EVENT0("shutdown",
 961                  "BrowserMainLoop::Subsystem:ImageTransportFactory");
 962     ImageTransportFactory::Terminate();
 963   }
 964 #endif
 965
 966 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 967   ZygoteHostImpl::GetInstance()->TearDownAfterLastChild();
 968 #endif  // defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 969
 970   // The device monitors are using |system_monitor_| as dependency, so delete
 971   // them before |system_monitor_| goes away.
 972   // On Mac and windows, the monitor needs to be destroyed on the same thread
 973   // as they were created. On Linux, the monitor will be deleted when IO thread
 974   // goes away.
 975 #if defined(OS_WIN)
 976   system_message_window_.reset();
 977 #elif defined(OS_MACOSX)
 978   device_monitor_mac_.reset();
 979 #endif
 980 #endif  // !defined(OS_IOS)
 981
 982   // Must be size_t so we can subtract from it.
 983   for (size_t thread_id = BrowserThread::ID_COUNT - 1;
 984        thread_id >= (BrowserThread::UI + 1);
 985        --thread_id) {
 986     // Find the thread object we want to stop. Looping over all valid
 987     // BrowserThread IDs and DCHECKing on a missing case in the switch
 988     // statement helps avoid a mismatch between this code and the
 989     // BrowserThread::ID enumeration.
 990     //
 991     // The destruction order is the reverse order of occurrence in the
 992     // BrowserThread::ID list. The rationale for the order is as
 993     // follows (need to be filled in a bit):
 994     //
 995     //
 996     // - The IO thread is the only user of the CACHE thread.
 997     //
 998     // - The PROCESS_LAUNCHER thread must be stopped after IO in case
 999     //   the IO thread posted a task to terminate a process on the
1000     //   process launcher thread.
1001     //
1002     // - (Not sure why DB stops last.)
1003     switch (thread_id) {
1004       case BrowserThread::DB: {
1005         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:DBThread");
1006         ResetThread_DB(db_thread_.Pass());
1007         break;
1008       }
1009       case BrowserThread::FILE: {
1010         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:FileThread");
1011 #if !defined(OS_IOS)
1012         // Clean up state that lives on or uses the file_thread_ before
1013         // it goes away.
1014         if (resource_dispatcher_host_)
1015           resource_dispatcher_host_.get()->save_file_manager()->Shutdown();
1016 #endif  // !defined(OS_IOS)
1017         ResetThread_FILE(file_thread_.Pass());
1018         break;
1019       }
1020       case BrowserThread::FILE_USER_BLOCKING: {
1021         TRACE_EVENT0("shutdown",
1022                       "BrowserMainLoop::Subsystem:FileUserBlockingThread");
1023         ResetThread_FILE_USER_BLOCKING(file_user_blocking_thread_.Pass());
1024         break;
1025       }
1026       case BrowserThread::PROCESS_LAUNCHER: {
1027         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:LauncherThread");
1028         ResetThread_PROCESS_LAUNCHER(process_launcher_thread_.Pass());
1029         break;
1030       }
1031       case BrowserThread::CACHE: {
1032         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:CacheThread");
1033         ResetThread_CACHE(cache_thread_.Pass());
1034         break;
1035       }
1036       case BrowserThread::IO: {
1037         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:IOThread");
1038         ResetThread_IO(io_thread_.Pass());
1039         break;
1040       }
1041       case BrowserThread::UI:
1042       case BrowserThread::ID_COUNT:
1043       default:
1044         NOTREACHED();
1045         break;
1046     }
1047   }
1048
1049 #if !defined(OS_IOS)
1050   {
1051     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:IndexedDBThread");
1052     ResetThread_IndexedDb(indexed_db_thread_.Pass());
1053   }
1054 #endif
1055
1056   // Close the blocking I/O pool after the other threads. Other threads such
1057   // as the I/O thread may need to schedule work like closing files or flushing
1058   // data during shutdown, so the blocking pool needs to be available. There
1059   // may also be slow operations pending that will blcok shutdown, so closing
1060   // it here (which will block until required operations are complete) gives
1061   // more head start for those operations to finish.
1062   {
1063     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:ThreadPool");
1064     BrowserThreadImpl::ShutdownThreadPool();
1065   }
1066
1067 #if !defined(OS_IOS)
1068   // Must happen after the IO thread is shutdown since this may be accessed from
1069   // it.
1070   {
1071     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:GPUChannelFactory");
1072     if (BrowserGpuChannelHostFactory::instance())
1073       BrowserGpuChannelHostFactory::Terminate();
1074   }
1075
1076   // Must happen after the I/O thread is shutdown since this class lives on the
1077   // I/O thread and isn't threadsafe.
1078   {
1079     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:GamepadService");
1080     GamepadService::GetInstance()->Terminate();
1081   }
1082   {
1083     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:SensorService");
1084     DeviceInertialSensorService::GetInstance()->Shutdown();
1085   }
1086 #if !defined(OS_ANDROID)
1087   {
1088     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:BatteryStatusService");
1089     device::BatteryStatusService::GetInstance()->Shutdown();
1090   }
1091 #endif
1092   {
1093     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:DeleteDataSources");
1094     URLDataManager::DeleteDataSources();
1095   }
1096 #endif  // !defined(OS_IOS)
1097
1098   if (parts_) {
1099     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:PostDestroyThreads");
1100     parts_->PostDestroyThreads();
1101   }
1102 }
1103
1104 void BrowserMainLoop::StopStartupTracingTimer() {
1105   startup_trace_timer_.Stop();
1106 }
1107
1108 void BrowserMainLoop::InitializeMainThread() {
1109   TRACE_EVENT0("startup", "BrowserMainLoop::InitializeMainThread");
1110   static const char kThreadName[] = "CrBrowserMain";
1111   base::PlatformThread::SetName(kThreadName);
1112   if (main_message_loop_)
1113     main_message_loop_->set_thread_name(kThreadName);
1114
1115   // Register the main thread by instantiating it, but don't call any methods.
1116   main_thread_.reset(
1117       new BrowserThreadImpl(BrowserThread::UI, base::MessageLoop::current()));
1118 }
1119
1120 int BrowserMainLoop::BrowserThreadsStarted() {
1121   TRACE_EVENT0("startup", "BrowserMainLoop::BrowserThreadsStarted");
1122
1123 #if !defined(OS_IOS)
1124   indexed_db_thread_.reset(new base::Thread("IndexedDB"));
1125   indexed_db_thread_->Start();
1126 #endif
1127
1128 #if !defined(OS_IOS)
1129   HistogramSynchronizer::GetInstance();
1130
1131 #if defined(OS_ANDROID)
1132   // Up the priority of the UI thread.
1133   base::PlatformThread::SetCurrentThreadPriority(base::ThreadPriority::DISPLAY);
1134 #endif
1135
1136   bool always_uses_gpu = true;
1137   bool established_gpu_channel = false;
1138 #if defined(OS_ANDROID)
1139   // TODO(crbug.com/439322): This should be set to |true|.
1140   established_gpu_channel = false;
1141   BrowserGpuChannelHostFactory::Initialize(established_gpu_channel);
1142 #elif defined(USE_AURA) || defined(OS_MACOSX)
1143   established_gpu_channel = true;
1144   if (!GpuDataManagerImpl::GetInstance()->CanUseGpuBrowserCompositor() ||
1145       parsed_command_line_.HasSwitch(switches::kDisableGpuEarlyInit)) {
1146     established_gpu_channel = always_uses_gpu = false;
1147   }
1148   BrowserGpuChannelHostFactory::Initialize(established_gpu_channel);
1149   ImageTransportFactory::Initialize();
1150 #if defined(USE_AURA)
1151   if (aura::Env::GetInstance()) {
1152     aura::Env::GetInstance()->set_context_factory(GetContextFactory());
1153   }
1154 #endif  // defined(USE_AURA)
1155 #endif  // defined(OS_ANDROID)
1156
1157   // Enable the GpuMemoryBuffer dump provider with IO thread affinity. Note that
1158   // unregistration happens on the IO thread (See
1159   // BrowserProcessSubThread::IOThreadPreCleanUp).
1160   base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(
1161       BrowserGpuMemoryBufferManager::current(), io_thread_->task_runner());
1162
1163   {
1164     TRACE_EVENT0("startup", "BrowserThreadsStarted::Subsystem:AudioMan");
1165     audio_manager_.reset(media::AudioManager::CreateWithHangTimer(
1166         MediaInternals::GetInstance(), io_thread_->task_runner()));
1167   }
1168
1169   {
1170     TRACE_EVENT0("startup", "BrowserThreadsStarted::Subsystem:MidiManager");
1171     midi_manager_.reset(media::midi::MidiManager::Create());
1172   }
1173
1174 #if defined(OS_LINUX) && defined(USE_UDEV)
1175   device_monitor_linux_.reset(new DeviceMonitorLinux());
1176 #elif defined(OS_MACOSX)
1177   device_monitor_mac_.reset(new DeviceMonitorMac());
1178 #endif
1179
1180 #if defined(OS_WIN)
1181   UMA_HISTOGRAM_BOOLEAN("Windows.Win32kRendererLockdown",
1182                         IsWin32kRendererLockdownEnabled());
1183 #endif
1184   // RDH needs the IO thread to be created
1185   {
1186     TRACE_EVENT0("startup",
1187       "BrowserMainLoop::BrowserThreadsStarted:InitResourceDispatcherHost");
1188     resource_dispatcher_host_.reset(new ResourceDispatcherHostImpl());
1189   }
1190
1191   // MediaStreamManager needs the IO thread to be created.
1192   {
1193     TRACE_EVENT0("startup",
1194       "BrowserMainLoop::BrowserThreadsStarted:InitMediaStreamManager");
1195     media_stream_manager_.reset(new MediaStreamManager(audio_manager_.get()));
1196   }
1197
1198   {
1199     TRACE_EVENT0("startup",
1200       "BrowserMainLoop::BrowserThreadsStarted:InitSpeechRecognition");
1201     speech_recognition_manager_.reset(new SpeechRecognitionManagerImpl(
1202         audio_manager_.get(), media_stream_manager_.get()));
1203   }
1204
1205   {
1206     TRACE_EVENT0(
1207         "startup",
1208         "BrowserMainLoop::BrowserThreadsStarted::InitUserInputMonitor");
1209     user_input_monitor_ = media::UserInputMonitor::Create(
1210         io_thread_->task_runner(), main_thread_->task_runner());
1211   }
1212
1213   {
1214     TRACE_EVENT0("startup",
1215                  "BrowserMainLoop::BrowserThreadsStarted::TimeZoneMonitor");
1216     time_zone_monitor_ = TimeZoneMonitor::Create();
1217   }
1218
1219   // Alert the clipboard class to which threads are allowed to access the
1220   // clipboard:
1221   std::vector<base::PlatformThreadId> allowed_clipboard_threads;
1222   // The current thread is the UI thread.
1223   allowed_clipboard_threads.push_back(base::PlatformThread::CurrentId());
1224 #if defined(OS_WIN)
1225   // On Windows, clipboards are also used on the FILE or IO threads.
1226   allowed_clipboard_threads.push_back(file_thread_->GetThreadId());
1227   allowed_clipboard_threads.push_back(io_thread_->GetThreadId());
1228 #endif
1229   ui::Clipboard::SetAllowedThreads(allowed_clipboard_threads);
1230
1231   // When running the GPU thread in-process, avoid optimistically starting it
1232   // since creating the GPU thread races against creation of the one-and-only
1233   // ChildProcess instance which is created by the renderer thread.
1234   if (GpuDataManagerImpl::GetInstance()->GpuAccessAllowed(NULL) &&
1235       !established_gpu_channel &&
1236       always_uses_gpu &&
1237       !UsingInProcessGpu()) {
1238     TRACE_EVENT_INSTANT0("gpu", "Post task to launch GPU process",
1239                          TRACE_EVENT_SCOPE_THREAD);
1240     BrowserThread::PostTask(
1241         BrowserThread::IO, FROM_HERE,
1242         base::Bind(base::IgnoreResult(&GpuProcessHost::Get),
1243                    GpuProcessHost::GPU_PROCESS_KIND_SANDBOXED,
1244                    CAUSE_FOR_GPU_LAUNCH_BROWSER_STARTUP));
1245   }
1246
1247 #if defined(OS_MACOSX)
1248   ThemeHelperMac::GetInstance();
1249   SystemHotkeyHelperMac::GetInstance()->DeferredLoadSystemHotkeys();
1250   if (ShouldEnableBootstrapSandbox()) {
1251     TRACE_EVENT0("startup",
1252                  "BrowserMainLoop::BrowserThreadsStarted:BootstrapSandbox");
1253     CHECK(GetBootstrapSandbox());
1254   }
1255 #endif  // defined(OS_MACOSX)
1256
1257 #endif  // !defined(OS_IOS)
1258
1259   mojo_shell_context_.reset(new MojoShellContext);
1260
1261   return result_code_;
1262 }
1263
1264 bool BrowserMainLoop::UsingInProcessGpu() const {
1265   return parsed_command_line_.HasSwitch(switches::kSingleProcess) ||
1266          parsed_command_line_.HasSwitch(switches::kInProcessGPU);
1267 }
1268
1269 bool BrowserMainLoop::InitializeToolkit() {
1270   TRACE_EVENT0("startup", "BrowserMainLoop::InitializeToolkit");
1271   TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::InitializeToolkit");
1272
1273   // TODO(evan): this function is rather subtle, due to the variety
1274   // of intersecting ifdefs we have.  To keep it easy to follow, there
1275   // are no #else branches on any #ifs.
1276   // TODO(stevenjb): Move platform specific code into platform specific Parts
1277   // (Need to add InitializeToolkit stage to BrowserParts).
1278   // See also GTK setup in EarlyInitialization, above, and associated comments.
1279
1280 #if defined(OS_WIN)
1281   // Init common control sex.
1282   INITCOMMONCONTROLSEX config;
1283   config.dwSize = sizeof(config);
1284   config.dwICC = ICC_WIN95_CLASSES;
1285   if (!InitCommonControlsEx(&config))
1286     PLOG(FATAL);
1287 #endif
1288
1289 #if defined(USE_AURA)
1290
1291 #if defined(USE_X11)
1292   if (!gfx::GetXDisplay())
1293     return false;
1294 #endif
1295
1296   // Env creates the compositor. Aura widgets need the compositor to be created
1297   // before they can be initialized by the browser.
1298   aura::Env::CreateInstance(true);
1299 #endif  // defined(USE_AURA)
1300
1301   if (parts_)
1302     parts_->ToolkitInitialized();
1303
1304   return true;
1305 }
1306
1307 void BrowserMainLoop::MainMessageLoopRun() {
1308 #if defined(OS_ANDROID)
1309   // Android's main message loop is the Java message loop.
1310   NOTREACHED();
1311 #else
1312   DCHECK(base::MessageLoopForUI::IsCurrent());
1313   if (parameters_.ui_task) {
1314     base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE,
1315                                                   *parameters_.ui_task);
1316   }
1317
1318   base::RunLoop run_loop;
1319   run_loop.Run();
1320 #endif
1321 }
1322
1323 base::FilePath BrowserMainLoop::GetStartupTraceFileName(
1324     const base::CommandLine& command_line) const {
1325   base::FilePath trace_file;
1326   if (command_line.HasSwitch(switches::kTraceStartup)) {
1327     trace_file = command_line.GetSwitchValuePath(
1328         switches::kTraceStartupFile);
1329     // trace_file = "none" means that startup events will show up for the next
1330     // begin/end tracing (via about:tracing or AutomationProxy::BeginTracing/
1331     // EndTracing, for example).
1332     if (trace_file == base::FilePath().AppendASCII("none"))
1333       return trace_file;
1334
1335     if (trace_file.empty()) {
1336 #if defined(OS_ANDROID)
1337       TracingControllerAndroid::GenerateTracingFilePath(&trace_file);
1338 #else
1339       // Default to saving the startup trace into the current dir.
1340       trace_file = base::FilePath().AppendASCII("chrometrace.log");
1341 #endif
1342     }
1343   } else {
1344 #if defined(OS_ANDROID)
1345     TracingControllerAndroid::GenerateTracingFilePath(&trace_file);
1346 #else
1347     trace_file = tracing::TraceConfigFile::GetInstance()->GetResultFile();
1348 #endif
1349   }
1350
1351   return trace_file;
1352 }
1353
1354 void BrowserMainLoop::InitStartupTracingForDuration(
1355     const base::CommandLine& command_line) {
1356   DCHECK(is_tracing_startup_for_duration_);
1357
1358   startup_trace_file_ = GetStartupTraceFileName(parsed_command_line_);
1359
1360   int delay_secs = 5;
1361   if (command_line.HasSwitch(switches::kTraceStartup)) {
1362     std::string delay_str = command_line.GetSwitchValueASCII(
1363         switches::kTraceStartupDuration);
1364     if (!delay_str.empty() && !base::StringToInt(delay_str, &delay_secs)) {
1365       DLOG(WARNING) << "Could not parse --" << switches::kTraceStartupDuration
1366           << "=" << delay_str << " defaulting to 5 (secs)";
1367       delay_secs = 5;
1368     }
1369   } else {
1370     delay_secs = tracing::TraceConfigFile::GetInstance()->GetStartupDuration();
1371   }
1372
1373   startup_trace_timer_.Start(FROM_HERE,
1374                              base::TimeDelta::FromSeconds(delay_secs),
1375                              this,
1376                              &BrowserMainLoop::EndStartupTracing);
1377 }
1378
1379 void BrowserMainLoop::EndStartupTracing() {
1380   DCHECK(is_tracing_startup_for_duration_);
1381
1382   is_tracing_startup_for_duration_ = false;
1383   TracingController::GetInstance()->DisableRecording(
1384       TracingController::CreateFileSink(
1385           startup_trace_file_,
1386           base::Bind(OnStoppedStartupTracing, startup_trace_file_)));
1387 }
1388
1389 }  // namespace content