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