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