content/browser/browser_main_loop.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/browser/browser_main_loop.h"
   6
   7 #include "base/bind.h"
   8 #include "base/command_line.h"
   9 #include "base/location.h"
  10 #include "base/logging.h"
  11 #include "base/memory/memory_pressure_monitor.h"
  12 #include "base/metrics/field_trial.h"
  13 #include "base/metrics/histogram.h"
  14 #include "base/pending_task.h"
  15 #include "base/power_monitor/power_monitor.h"
  16 #include "base/power_monitor/power_monitor_device_source.h"
  17 #include "base/process/process_metrics.h"
  18 #include "base/profiler/scoped_profile.h"
  19 #include "base/run_loop.h"
  20 #include "base/single_thread_task_runner.h"
  21 #include "base/strings/string_number_conversions.h"
  22 #include "base/strings/string_split.h"
  23 #include "base/system_monitor/system_monitor.h"
  24 #include "base/thread_task_runner_handle.h"
  25 #include "base/threading/thread_restrictions.h"
  26 #include "base/timer/hi_res_timer_manager.h"
  27 #include "base/trace_event/memory_dump_manager.h"
  28 #include "base/trace_event/trace_event.h"
  29 #include "components/tracing/trace_config_file.h"
  30 #include "components/tracing/tracing_switches.h"
  31 #include "content/browser/browser_thread_impl.h"
  32 #include "content/browser/device_sensors/device_inertial_sensor_service.h"
  33 #include "content/browser/dom_storage/dom_storage_area.h"
  34 #include "content/browser/download/save_file_manager.h"
  35 #include "content/browser/gamepad/gamepad_service.h"
  36 #include "content/browser/gpu/browser_gpu_channel_host_factory.h"
  37 #include "content/browser/gpu/browser_gpu_memory_buffer_manager.h"
  38 #include "content/browser/gpu/compositor_util.h"
  39 #include "content/browser/gpu/gpu_data_manager_impl.h"
  40 #include "content/browser/gpu/gpu_process_host.h"
  41 #include "content/browser/gpu/gpu_process_host_ui_shim.h"
  42 #include "content/browser/histogram_synchronizer.h"
  43 #include "content/browser/loader/resource_dispatcher_host_impl.h"
  44 #include "content/browser/media/media_internals.h"
  45 #include "content/browser/mojo/mojo_shell_context.h"
  46 #include "content/browser/net/browser_online_state_observer.h"
  47 #include "content/browser/renderer_host/media/media_stream_manager.h"
  48 #include "content/browser/speech/speech_recognition_manager_impl.h"
  49 #include "content/browser/startup_task_runner.h"
  50 #include "content/browser/time_zone_monitor.h"
  51 #include "content/browser/webui/content_web_ui_controller_factory.h"
  52 #include "content/browser/webui/url_data_manager.h"
  53 #include "content/common/content_switches_internal.h"
  54 #include "content/common/host_discardable_shared_memory_manager.h"
  55 #include "content/common/host_shared_bitmap_manager.h"
  56 #include "content/common/resource_messages.h"
  57 #include "content/public/browser/browser_main_parts.h"
  58 #include "content/public/browser/content_browser_client.h"
  59 #include "content/public/browser/render_process_host.h"
  60 #include "content/public/browser/tracing_controller.h"
  61 #include "content/public/common/content_switches.h"
  62 #include "content/public/common/main_function_params.h"
  63 #include "content/public/common/result_codes.h"
  64 #include "crypto/nss_util.h"
  65 #include "device/battery/battery_status_service.h"
  66 #include "ipc/ipc_channel.h"
  67 #include "media/audio/audio_manager.h"
  68 #include "media/base/media.h"
  69 #include "media/base/user_input_monitor.h"
  70 #include "media/midi/midi_manager.h"
  71 #include "net/base/network_change_notifier.h"
  72 #include "net/socket/client_socket_factory.h"
  73 #include "net/ssl/ssl_config_service.h"
  74 #include "skia/ext/skia_memory_dump_provider.h"
  75 #include "ui/base/clipboard/clipboard.h"
  76
  77 #if defined(USE_AURA) || (defined(OS_MACOSX) && !defined(OS_IOS))
  78 #include "content/browser/compositor/image_transport_factory.h"
  79 #endif
  80
  81 #if defined(USE_AURA)
  82 #include "content/public/browser/context_factory.h"
  83 #include "ui/aura/env.h"
  84 #endif
  85
  86 #if !defined(OS_IOS)
  87 #include "content/browser/renderer_host/render_process_host_impl.h"
  88 #endif
  89
  90 #if defined(OS_ANDROID)
  91 #include "base/android/jni_android.h"
  92 #include "content/browser/android/browser_startup_controller.h"
  93 #include "content/browser/android/browser_surface_texture_manager.h"
  94 #include "content/browser/android/in_process_surface_texture_manager.h"
  95 #include "content/browser/android/tracing_controller_android.h"
  96 #include "content/browser/screen_orientation/screen_orientation_delegate_android.h"
  97 #include "content/public/browser/screen_orientation_provider.h"
  98 #include "ui/gl/gl_surface.h"
  99 #endif
 100
 101 #if defined(OS_MACOSX)
 102 #include "media/base/mac/avfoundation_glue.h"
 103 #endif
 104
 105 #if defined(OS_MACOSX) && !defined(OS_IOS)
 106 #include "base/memory/memory_pressure_monitor_mac.h"
 107 #include "content/browser/bootstrap_sandbox_manager_mac.h"
 108 #include "content/browser/browser_io_surface_manager_mac.h"
 109 #include "content/browser/cocoa/system_hotkey_helper_mac.h"
 110 #include "content/browser/compositor/browser_compositor_view_mac.h"
 111 #include "content/browser/in_process_io_surface_manager_mac.h"
 112 #include "content/browser/theme_helper_mac.h"
 113 #endif
 114
 115 #if defined(USE_OZONE)
 116 #include "ui/ozone/public/client_native_pixmap_factory.h"
 117 #include "ui/ozone/public/ozone_platform.h"
 118 #endif
 119
 120 #if defined(OS_WIN)
 121 #include <windows.h>
 122 #include <commctrl.h>
 123 #include <shellapi.h>
 124
 125 #include "base/memory/memory_pressure_monitor_win.h"
 126 #include "content/browser/system_message_window_win.h"
 127 #include "content/common/sandbox_win.h"
 128 #include "net/base/winsock_init.h"
 129 #include "ui/base/l10n/l10n_util_win.h"
 130 #endif
 131
 132 #if defined(OS_CHROMEOS)
 133 #include "base/memory/memory_pressure_monitor_chromeos.h"
 134 #include "chromeos/chromeos_switches.h"
 135 #endif
 136
 137 #if defined(USE_GLIB)
 138 #include <glib-object.h>
 139 #endif
 140
 141 #if defined(OS_LINUX) && defined(USE_UDEV)
 142 #include "content/browser/device_monitor_udev.h"
 143 #elif defined(OS_MACOSX) && !defined(OS_IOS)
 144 #include "content/browser/device_monitor_mac.h"
 145 #endif
 146
 147 #if defined(OS_POSIX) && !defined(OS_MACOSX)
 148 #include "content/browser/renderer_host/render_sandbox_host_linux.h"
 149 #include "content/browser/zygote_host/zygote_host_impl_linux.h"
 150 #include "sandbox/linux/suid/client/setuid_sandbox_host.h"
 151 #endif
 152
 153 #if defined(ENABLE_PLUGINS)
 154 #include "content/browser/plugin_service_impl.h"
 155 #endif
 156
 157 #if defined(TCMALLOC_TRACE_MEMORY_SUPPORTED)
 158 #include "third_party/tcmalloc/chromium/src/gperftools/heap-profiler.h"
 159 #endif
 160
 161 #if defined(USE_X11)
 162 #include "ui/gfx/x/x11_connection.h"
 163 #include "ui/gfx/x/x11_types.h"
 164 #endif
 165
 166 // One of the linux specific headers defines this as a macro.
 167 #ifdef DestroyAll
 168 #undef DestroyAll
 169 #endif
 170
 171 namespace content {
 172 namespace {
 173
 174 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 175 void SetupSandbox(const base::CommandLine& parsed_command_line) {
 176   TRACE_EVENT0("startup", "SetupSandbox");
 177   base::FilePath sandbox_binary;
 178
 179   scoped_ptr<sandbox::SetuidSandboxHost> setuid_sandbox_host(
 180       sandbox::SetuidSandboxHost::Create());
 181
 182   const bool want_setuid_sandbox =
 183       !parsed_command_line.HasSwitch(switches::kNoSandbox) &&
 184       !parsed_command_line.HasSwitch(switches::kDisableSetuidSandbox) &&
 185       !setuid_sandbox_host->IsDisabledViaEnvironment();
 186
 187   static const char no_suid_error[] =
 188       "Running without the SUID sandbox! See "
 189       "https://code.google.com/p/chromium/wiki/LinuxSUIDSandboxDevelopment "
 190       "for more information on developing with the sandbox on.";
 191   if (want_setuid_sandbox) {
 192     sandbox_binary = setuid_sandbox_host->GetSandboxBinaryPath();
 193     if (sandbox_binary.empty()) {
 194       // This needs to be fatal. Talk to security@chromium.org if you feel
 195       // otherwise.
 196       LOG(FATAL) << no_suid_error;
 197     }
 198   } else {
 199     LOG(ERROR) << no_suid_error;
 200   }
 201
 202   // Tickle the sandbox host and zygote host so they fork now.
 203   RenderSandboxHostLinux::GetInstance()->Init();
 204   ZygoteHostImpl::GetInstance()->Init(sandbox_binary.value());
 205 }
 206 #endif
 207
 208 #if defined(USE_GLIB)
 209 static void GLibLogHandler(const gchar* log_domain,
 210                            GLogLevelFlags log_level,
 211                            const gchar* message,
 212                            gpointer userdata) {
 213   if (!log_domain)
 214     log_domain = "<unknown>";
 215   if (!message)
 216     message = "<no message>";
 217
 218   if (strstr(message, "Unable to retrieve the file info for")) {
 219     LOG(ERROR) << "GTK File code error: " << message;
 220   } else if (strstr(message, "Could not find the icon") &&
 221              strstr(log_domain, "Gtk")) {
 222     LOG(ERROR) << "GTK icon error: " << message;
 223   } else if (strstr(message, "Theme file for default has no") ||
 224              strstr(message, "Theme directory") ||
 225              strstr(message, "theme pixmap") ||
 226              strstr(message, "locate theme engine")) {
 227     LOG(ERROR) << "GTK theme error: " << message;
 228   } else if (strstr(message, "Unable to create Ubuntu Menu Proxy") &&
 229              strstr(log_domain, "<unknown>")) {
 230     LOG(ERROR) << "GTK menu proxy create failed";
 231   } else if (strstr(message, "Out of memory") &&
 232              strstr(log_domain, "<unknown>")) {
 233     LOG(ERROR) << "DBus call timeout or out of memory: "
 234                << "http://crosbug.com/15496";
 235   } else if (strstr(message, "Could not connect: Connection refused") &&
 236              strstr(log_domain, "<unknown>")) {
 237     LOG(ERROR) << "DConf settings backend could not connect to session bus: "
 238                << "http://crbug.com/179797";
 239   } else if (strstr(message, "Attempting to store changes into") ||
 240              strstr(message, "Attempting to set the permissions of")) {
 241     LOG(ERROR) << message << " (http://bugs.chromium.org/161366)";
 242   } else if (strstr(message, "drawable is not a native X11 window")) {
 243     LOG(ERROR) << message << " (http://bugs.chromium.org/329991)";
 244   } else if (strstr(message, "Cannot do system-bus activation with no user")) {
 245     LOG(ERROR) << message << " (http://crbug.com/431005)";
 246   } else if (strstr(message, "deprecated")) {
 247     LOG(ERROR) << message;
 248   } else {
 249     LOG(DFATAL) << log_domain << ": " << message;
 250   }
 251 }
 252
 253 static void SetUpGLibLogHandler() {
 254   // Register GLib-handled assertions to go through our logging system.
 255   const char* kLogDomains[] = { NULL, "Gtk", "Gdk", "GLib", "GLib-GObject" };
 256   for (size_t i = 0; i < arraysize(kLogDomains); i++) {
 257     g_log_set_handler(kLogDomains[i],
 258                       static_cast<GLogLevelFlags>(G_LOG_FLAG_RECURSION |
 259                                                   G_LOG_FLAG_FATAL |
 260                                                   G_LOG_LEVEL_ERROR |
 261                                                   G_LOG_LEVEL_CRITICAL |
 262                                                   G_LOG_LEVEL_WARNING),
 263                       GLibLogHandler,
 264                       NULL);
 265   }
 266 }
 267 #endif
 268
 269 void OnStoppedStartupTracing(const base::FilePath& trace_file) {
 270   VLOG(0) << "Completed startup tracing to " << trace_file.value();
 271 }
 272
 273 // Disable optimizations for this block of functions so the compiler doesn't
 274 // merge them all together. This makes it possible to tell what thread was
 275 // unresponsive by inspecting the callstack.
 276 MSVC_DISABLE_OPTIMIZE()
 277 MSVC_PUSH_DISABLE_WARNING(4748)
 278
 279 NOINLINE void ResetThread_DB(scoped_ptr<BrowserProcessSubThread> thread) {
 280   volatile int inhibit_comdat = __LINE__;
 281   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 282   thread.reset();
 283 }
 284
 285 NOINLINE void ResetThread_FILE(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_FILE_USER_BLOCKING(
 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_PROCESS_LAUNCHER(
 299     scoped_ptr<BrowserProcessSubThread> thread) {
 300   volatile int inhibit_comdat = __LINE__;
 301   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 302   thread.reset();
 303 }
 304
 305 NOINLINE void ResetThread_CACHE(scoped_ptr<BrowserProcessSubThread> thread) {
 306   volatile int inhibit_comdat = __LINE__;
 307   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 308   thread.reset();
 309 }
 310
 311 NOINLINE void ResetThread_IO(scoped_ptr<BrowserProcessSubThread> thread) {
 312   volatile int inhibit_comdat = __LINE__;
 313   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 314   thread.reset();
 315 }
 316
 317 #if !defined(OS_IOS)
 318 NOINLINE void ResetThread_IndexedDb(scoped_ptr<base::Thread> thread) {
 319   volatile int inhibit_comdat = __LINE__;
 320   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 321   thread.reset();
 322 }
 323 #endif
 324
 325 MSVC_POP_WARNING()
 326 MSVC_ENABLE_OPTIMIZE();
 327
 328 #if defined(OS_WIN)
 329 // Creates a memory pressure monitor using automatic thresholds, or those
 330 // specified on the command-line. Ownership is passed to the caller.
 331 base::win::MemoryPressureMonitor* CreateWinMemoryPressureMonitor(
 332     const base::CommandLine& parsed_command_line) {
 333   std::vector<std::string> thresholds = base::SplitString(
 334       parsed_command_line.GetSwitchValueASCII(
 335           switches::kMemoryPressureThresholdsMb),
 336       ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
 337
 338   int moderate_threshold_mb = 0;
 339   int critical_threshold_mb = 0;
 340   if (thresholds.size() == 2 &&
 341       base::StringToInt(thresholds[0], &moderate_threshold_mb) &&
 342       base::StringToInt(thresholds[1], &critical_threshold_mb) &&
 343       moderate_threshold_mb >= critical_threshold_mb &&
 344       critical_threshold_mb >= 0) {
 345     return new base::win::MemoryPressureMonitor(moderate_threshold_mb,
 346                                                 critical_threshold_mb);
 347   }
 348
 349   // In absence of valid switches use the automatic defaults.
 350   return new base::win::MemoryPressureMonitor();
 351 }
 352 #endif  // defined(OS_WIN)
 353
 354 }  // namespace
 355
 356 // The currently-running BrowserMainLoop.  There can be one or zero.
 357 BrowserMainLoop* g_current_browser_main_loop = NULL;
 358
 359 // For measuring memory usage after each task. Behind a command line flag.
 360 class BrowserMainLoop::MemoryObserver : public base::MessageLoop::TaskObserver {
 361  public:
 362   MemoryObserver() {}
 363   ~MemoryObserver() override {}
 364
 365   void WillProcessTask(const base::PendingTask& pending_task) override {}
 366
 367   void DidProcessTask(const base::PendingTask& pending_task) override {
 368 #if !defined(OS_IOS)  // No ProcessMetrics on IOS.
 369     scoped_ptr<base::ProcessMetrics> process_metrics(
 370         base::ProcessMetrics::CreateProcessMetrics(
 371 #if defined(OS_MACOSX)
 372             base::GetCurrentProcessHandle(), NULL));
 373 #else
 374             base::GetCurrentProcessHandle()));
 375 #endif
 376     size_t private_bytes;
 377     process_metrics->GetMemoryBytes(&private_bytes, NULL);
 378     LOCAL_HISTOGRAM_MEMORY_KB("Memory.BrowserUsed", private_bytes >> 10);
 379 #endif
 380   }
 381  private:
 382   DISALLOW_COPY_AND_ASSIGN(MemoryObserver);
 383 };
 384
 385
 386 // BrowserMainLoop construction / destruction =============================
 387
 388 BrowserMainLoop* BrowserMainLoop::GetInstance() {
 389   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 390   return g_current_browser_main_loop;
 391 }
 392
 393 BrowserMainLoop::BrowserMainLoop(const MainFunctionParams& parameters)
 394     : parameters_(parameters),
 395       parsed_command_line_(parameters.command_line),
 396       result_code_(RESULT_CODE_NORMAL_EXIT),
 397       created_threads_(false),
 398       // ContentMainRunner should have enabled tracing of the browser process
 399       // when kTraceStartup or kTraceConfigFile is in the command line.
 400       is_tracing_startup_for_duration_(
 401           parameters.command_line.HasSwitch(switches::kTraceStartup) ||
 402           (tracing::TraceConfigFile::GetInstance()->IsEnabled() &&
 403            tracing::TraceConfigFile::GetInstance()->GetStartupDuration() > 0)) {
 404   DCHECK(!g_current_browser_main_loop);
 405   g_current_browser_main_loop = this;
 406 }
 407
 408 BrowserMainLoop::~BrowserMainLoop() {
 409   DCHECK_EQ(this, g_current_browser_main_loop);
 410 #if !defined(OS_IOS)
 411   ui::Clipboard::DestroyClipboardForCurrentThread();
 412 #endif  // !defined(OS_IOS)
 413   g_current_browser_main_loop = NULL;
 414 }
 415
 416 void BrowserMainLoop::Init() {
 417   TRACE_EVENT0("startup", "BrowserMainLoop::Init");
 418   TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::Init");
 419
 420   parts_.reset(
 421       GetContentClient()->browser()->CreateBrowserMainParts(parameters_));
 422 }
 423
 424 // BrowserMainLoop stages ==================================================
 425
 426 void BrowserMainLoop::EarlyInitialization() {
 427   TRACE_EVENT0("startup", "BrowserMainLoop::EarlyInitialization");
 428   TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::EarlyInitialization");
 429
 430 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 431   // No thread should be created before this call, as SetupSandbox()
 432   // will end-up using fork().
 433   SetupSandbox(parsed_command_line_);
 434 #endif
 435
 436 #if defined(USE_X11)
 437   if (UsingInProcessGpu()) {
 438     if (!gfx::InitializeThreadedX11()) {
 439       LOG(ERROR) << "Failed to put Xlib into threaded mode.";
 440     }
 441   }
 442 #endif
 443
 444   // GLib's spawning of new processes is buggy, so it's important that at this
 445   // point GLib does not need to start DBUS. Chrome should always start with
 446   // DBUS_SESSION_BUS_ADDRESS properly set. See crbug.com/309093.
 447 #if defined(USE_GLIB)
 448   // g_type_init will be deprecated in 2.36. 2.35 is the development
 449   // version for 2.36, hence do not call g_type_init starting 2.35.
 450   // http://developer.gnome.org/gobject/unstable/gobject-Type-Information.html#g-type-init
 451 #if !GLIB_CHECK_VERSION(2, 35, 0)
 452   // GLib type system initialization. Needed at least for gconf,
 453   // used in net/proxy/proxy_config_service_linux.cc. Most likely
 454   // this is superfluous as gtk_init() ought to do this. It's
 455   // definitely harmless, so retained as a reminder of this
 456   // requirement for gconf.
 457   g_type_init();
 458 #endif
 459
 460   SetUpGLibLogHandler();
 461 #endif
 462
 463   if (parts_)
 464     parts_->PreEarlyInitialization();
 465
 466 #if defined(OS_MACOSX)
 467   // We use quite a few file descriptors for our IPC, and the default limit on
 468   // the Mac is low (256), so bump it up.
 469   base::SetFdLimit(1024);
 470 #endif
 471
 472 #if defined(OS_WIN)
 473   net::EnsureWinsockInit();
 474 #endif
 475
 476 #if defined(USE_NSS_CERTS) || !defined(USE_OPENSSL)
 477   // We want to be sure to init NSPR on the main thread.
 478   crypto::EnsureNSPRInit();
 479 #endif
 480
 481 #if !defined(OS_IOS)
 482   if (parsed_command_line_.HasSwitch(switches::kRendererProcessLimit)) {
 483     std::string limit_string = parsed_command_line_.GetSwitchValueASCII(
 484         switches::kRendererProcessLimit);
 485     size_t process_limit;
 486     if (base::StringToSizeT(limit_string, &process_limit)) {
 487       RenderProcessHost::SetMaxRendererProcessCount(process_limit);
 488     }
 489   }
 490 #endif  // !defined(OS_IOS)
 491
 492   // TODO(boliu): kSingleProcess check is a temporary workaround for
 493   // in-process Android WebView. crbug.com/503724 tracks proper fix.
 494   if (!parsed_command_line_.HasSwitch(switches::kSingleProcess)) {
 495     base::DiscardableMemoryAllocator::SetInstance(
 496         HostDiscardableSharedMemoryManager::current());
 497   }
 498
 499   if (parts_)
 500     parts_->PostEarlyInitialization();
 501 }
 502
 503 void BrowserMainLoop::PreMainMessageLoopStart() {
 504   if (parts_) {
 505     TRACE_EVENT0("startup",
 506         "BrowserMainLoop::MainMessageLoopStart:PreMainMessageLoopStart");
 507     parts_->PreMainMessageLoopStart();
 508   }
 509
 510 #if defined(OS_WIN)
 511   // If we're running tests (ui_task is non-null), then the ResourceBundle
 512   // has already been initialized.
 513   if (!parameters_.ui_task) {
 514     // Override the configured locale with the user's preferred UI language.
 515     l10n_util::OverrideLocaleWithUILanguageList();
 516   }
 517 #endif
 518 }
 519
 520 void BrowserMainLoop::MainMessageLoopStart() {
 521   // DO NOT add more code here. Use PreMainMessageLoopStart() above or
 522   // PostMainMessageLoopStart() below.
 523
 524   TRACE_EVENT0("startup", "BrowserMainLoop::MainMessageLoopStart");
 525   TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::MainMessageLoopStart");
 526
 527   // Create a MessageLoop if one does not already exist for the current thread.
 528   if (!base::MessageLoop::current())
 529     main_message_loop_.reset(new base::MessageLoopForUI);
 530
 531   InitializeMainThread();
 532 }
 533
 534 void BrowserMainLoop::PostMainMessageLoopStart() {
 535   {
 536     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:SystemMonitor");
 537     system_monitor_.reset(new base::SystemMonitor);
 538   }
 539   {
 540     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:PowerMonitor");
 541     scoped_ptr<base::PowerMonitorSource> power_monitor_source(
 542       new base::PowerMonitorDeviceSource());
 543     power_monitor_.reset(new base::PowerMonitor(power_monitor_source.Pass()));
 544   }
 545   {
 546     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:HighResTimerManager");
 547     hi_res_timer_manager_.reset(new base::HighResolutionTimerManager);
 548   }
 549   {
 550     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:NetworkChangeNotifier");
 551     network_change_notifier_.reset(net::NetworkChangeNotifier::Create());
 552   }
 553
 554 #if !defined(OS_IOS)
 555   {
 556     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:MediaFeatures");
 557     media::InitializeMediaLibrary();
 558   }
 559   {
 560     TRACE_EVENT0("startup",
 561                  "BrowserMainLoop::Subsystem:ContentWebUIController");
 562     WebUIControllerFactory::RegisterFactory(
 563         ContentWebUIControllerFactory::GetInstance());
 564   }
 565
 566   {
 567     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:OnlineStateObserver");
 568     online_state_observer_.reset(new BrowserOnlineStateObserver);
 569   }
 570
 571   {
 572     system_stats_monitor_.reset(
 573         new base::trace_event::TraceEventSystemStatsMonitor(
 574             base::ThreadTaskRunnerHandle::Get()));
 575   }
 576 #endif  // !defined(OS_IOS)
 577
 578 #if defined(OS_WIN)
 579   system_message_window_.reset(new SystemMessageWindowWin);
 580 #endif
 581
 582   if (parts_)
 583     parts_->PostMainMessageLoopStart();
 584
 585 #if !defined(OS_IOS)
 586   // Start tracing to a file if needed. Only do this after starting the main
 587   // message loop to avoid calling MessagePumpForUI::ScheduleWork() before
 588   // MessagePumpForUI::Start() as it will crash the browser.
 589   if (is_tracing_startup_for_duration_) {
 590     TRACE_EVENT0("startup", "BrowserMainLoop::InitStartupTracingForDuration");
 591     InitStartupTracingForDuration(parsed_command_line_);
 592   }
 593 #endif  // !defined(OS_IOS)
 594
 595 #if defined(OS_ANDROID)
 596   {
 597     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:SurfaceTextureManager");
 598     if (parsed_command_line_.HasSwitch(switches::kSingleProcess)) {
 599       SurfaceTextureManager::SetInstance(
 600           InProcessSurfaceTextureManager::GetInstance());
 601     } else {
 602       SurfaceTextureManager::SetInstance(
 603           BrowserSurfaceTextureManager::GetInstance());
 604     }
 605   }
 606
 607   if (!parsed_command_line_.HasSwitch(
 608       switches::kDisableScreenOrientationLock)) {
 609     TRACE_EVENT0("startup",
 610                  "BrowserMainLoop::Subsystem:ScreenOrientationProvider");
 611     screen_orientation_delegate_.reset(
 612         new ScreenOrientationDelegateAndroid());
 613     ScreenOrientationProvider::SetDelegate(screen_orientation_delegate_.get());
 614   }
 615 #endif
 616
 617 #if defined(OS_MACOSX) && !defined(OS_IOS)
 618   {
 619     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:IOSurfaceManager");
 620     if (parsed_command_line_.HasSwitch(switches::kSingleProcess)) {
 621       IOSurfaceManager::SetInstance(InProcessIOSurfaceManager::GetInstance());
 622     } else {
 623       IOSurfaceManager::SetInstance(BrowserIOSurfaceManager::GetInstance());
 624     }
 625   }
 626
 627   if (BootstrapSandboxManager::ShouldEnable()) {
 628     TRACE_EVENT0("startup",
 629                  "BrowserMainLoop::Subsystem:BootstrapSandbox");
 630     CHECK(BootstrapSandboxManager::GetInstance());
 631   }
 632 #endif
 633
 634 #if defined(USE_OZONE)
 635   client_native_pixmap_factory_ = ui::ClientNativePixmapFactory::Create();
 636   ui::ClientNativePixmapFactory::SetInstance(
 637       client_native_pixmap_factory_.get());
 638   ui::ClientNativePixmapFactory::GetInstance()->Initialize(
 639       ui::OzonePlatform::GetInstance()->OpenClientNativePixmapDevice());
 640 #endif
 641
 642   if (parsed_command_line_.HasSwitch(switches::kMemoryMetrics)) {
 643     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:MemoryObserver");
 644     memory_observer_.reset(new MemoryObserver());
 645     base::MessageLoop::current()->AddTaskObserver(memory_observer_.get());
 646   }
 647
 648   if (parsed_command_line_.HasSwitch(
 649           switches::kEnableAggressiveDOMStorageFlushing)) {
 650     TRACE_EVENT0("startup",
 651                  "BrowserMainLoop::Subsystem:EnableAggressiveCommitDelay");
 652     DOMStorageArea::EnableAggressiveCommitDelay();
 653   }
 654
 655   // Enable memory-infra dump providers.
 656   base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(
 657       HostSharedBitmapManager::current());
 658   base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(
 659       skia::SkiaMemoryDumpProvider::GetInstance());
 660
 661 #if defined(TCMALLOC_TRACE_MEMORY_SUPPORTED)
 662   trace_memory_controller_.reset(new base::trace_event::TraceMemoryController(
 663       base::MessageLoop::current()->task_runner(),
 664       ::HeapProfilerWithPseudoStackStart, ::HeapProfilerStop,
 665       ::GetHeapProfile));
 666 #endif
 667 }
 668
 669 int BrowserMainLoop::PreCreateThreads() {
 670   if (parts_) {
 671     TRACE_EVENT0("startup",
 672         "BrowserMainLoop::CreateThreads:PreCreateThreads");
 673     TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::PreCreateThreads");
 674
 675     result_code_ = parts_->PreCreateThreads();
 676   }
 677
 678   // TODO(chrisha): Abstract away this construction mess to a helper function,
 679   // once MemoryPressureMonitor is made a concrete class.
 680 #if defined(OS_CHROMEOS)
 681   if (chromeos::switches::MemoryPressureHandlingEnabled()) {
 682     memory_pressure_monitor_.reset(new base::chromeos::MemoryPressureMonitor(
 683         chromeos::switches::GetMemoryPressureThresholds()));
 684   }
 685 #elif defined(OS_MACOSX) && !defined(OS_IOS)
 686   memory_pressure_monitor_.reset(new base::mac::MemoryPressureMonitor());
 687 #elif defined(OS_WIN)
 688   memory_pressure_monitor_.reset(CreateWinMemoryPressureMonitor(
 689       parsed_command_line_));
 690 #endif
 691
 692 #if defined(ENABLE_PLUGINS)
 693   // Prior to any processing happening on the io thread, we create the
 694   // plugin service as it is predominantly used from the io thread,
 695   // but must be created on the main thread. The service ctor is
 696   // inexpensive and does not invoke the io_thread() accessor.
 697   {
 698     TRACE_EVENT0("startup", "BrowserMainLoop::CreateThreads:PluginService");
 699     PluginService::GetInstance()->Init();
 700   }
 701 #endif
 702
 703 #if defined(OS_MACOSX)
 704   {
 705     // Initialize AVFoundation if supported, for audio and video.
 706     TRACE_EVENT0("startup",
 707                  "BrowserMainLoop::CreateThreads:InitializeAVFoundation");
 708     AVFoundationGlue::InitializeAVFoundation();
 709   }
 710 #endif
 711
 712   // 1) Need to initialize in-process GpuDataManager before creating threads.
 713   // It's unsafe to append the gpu command line switches to the global
 714   // CommandLine::ForCurrentProcess object after threads are created.
 715   // 2) Must be after parts_->PreCreateThreads to pick up chrome://flags.
 716   GpuDataManagerImpl::GetInstance()->Initialize();
 717
 718 #if !defined(OS_IOS) && (!defined(GOOGLE_CHROME_BUILD) || defined(OS_ANDROID))
 719   // Single-process is an unsupported and not fully tested mode, so
 720   // don't enable it for official Chrome builds (except on Android).
 721   if (parsed_command_line_.HasSwitch(switches::kSingleProcess))
 722     RenderProcessHost::SetRunRendererInProcess(true);
 723 #endif
 724
 725   return result_code_;
 726 }
 727
 728 void BrowserMainLoop::CreateStartupTasks() {
 729   TRACE_EVENT0("startup", "BrowserMainLoop::CreateStartupTasks");
 730   TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::CreateStartupTasks");
 731
 732   // First time through, we really want to create all the tasks
 733   if (!startup_task_runner_.get()) {
 734 #if defined(OS_ANDROID)
 735     startup_task_runner_ = make_scoped_ptr(
 736         new StartupTaskRunner(base::Bind(&BrowserStartupComplete),
 737                               base::ThreadTaskRunnerHandle::Get()));
 738 #else
 739     startup_task_runner_ = make_scoped_ptr(
 740         new StartupTaskRunner(base::Callback<void(int)>(),
 741                               base::ThreadTaskRunnerHandle::Get()));
 742 #endif
 743     StartupTask pre_create_threads =
 744         base::Bind(&BrowserMainLoop::PreCreateThreads, base::Unretained(this));
 745     startup_task_runner_->AddTask(pre_create_threads);
 746
 747     StartupTask create_threads =
 748         base::Bind(&BrowserMainLoop::CreateThreads, base::Unretained(this));
 749     startup_task_runner_->AddTask(create_threads);
 750
 751     StartupTask browser_thread_started = base::Bind(
 752         &BrowserMainLoop::BrowserThreadsStarted, base::Unretained(this));
 753     startup_task_runner_->AddTask(browser_thread_started);
 754
 755     StartupTask pre_main_message_loop_run = base::Bind(
 756         &BrowserMainLoop::PreMainMessageLoopRun, base::Unretained(this));
 757     startup_task_runner_->AddTask(pre_main_message_loop_run);
 758
 759 #if defined(OS_ANDROID)
 760     if (BrowserMayStartAsynchronously()) {
 761       startup_task_runner_->StartRunningTasksAsync();
 762     }
 763 #endif
 764   }
 765 #if defined(OS_ANDROID)
 766   if (!BrowserMayStartAsynchronously()) {
 767     // A second request for asynchronous startup can be ignored, so
 768     // StartupRunningTasksAsync is only called first time through. If, however,
 769     // this is a request for synchronous startup then it must override any
 770     // previous call for async startup, so we call RunAllTasksNow()
 771     // unconditionally.
 772     startup_task_runner_->RunAllTasksNow();
 773   }
 774 #else
 775   startup_task_runner_->RunAllTasksNow();
 776 #endif
 777 }
 778
 779 int BrowserMainLoop::CreateThreads() {
 780   TRACE_EVENT0("startup", "BrowserMainLoop::CreateThreads");
 781   TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::CreateThreads");
 782
 783   base::Thread::Options io_message_loop_options;
 784   io_message_loop_options.message_loop_type = base::MessageLoop::TYPE_IO;
 785   base::Thread::Options ui_message_loop_options;
 786   ui_message_loop_options.message_loop_type = base::MessageLoop::TYPE_UI;
 787
 788   // Start threads in the order they occur in the BrowserThread::ID
 789   // enumeration, except for BrowserThread::UI which is the main
 790   // thread.
 791   //
 792   // Must be size_t so we can increment it.
 793   for (size_t thread_id = BrowserThread::UI + 1;
 794        thread_id < BrowserThread::ID_COUNT;
 795        ++thread_id) {
 796     scoped_ptr<BrowserProcessSubThread>* thread_to_start = NULL;
 797     base::Thread::Options options;
 798
 799     switch (thread_id) {
 800       case BrowserThread::DB:
 801         TRACE_EVENT_BEGIN1("startup",
 802             "BrowserMainLoop::CreateThreads:start",
 803             "Thread", "BrowserThread::DB");
 804         thread_to_start = &db_thread_;
 805         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 806         break;
 807       case BrowserThread::FILE_USER_BLOCKING:
 808         TRACE_EVENT_BEGIN1("startup",
 809             "BrowserMainLoop::CreateThreads:start",
 810             "Thread", "BrowserThread::FILE_USER_BLOCKING");
 811         thread_to_start = &file_user_blocking_thread_;
 812         break;
 813       case BrowserThread::FILE:
 814         TRACE_EVENT_BEGIN1("startup",
 815             "BrowserMainLoop::CreateThreads:start",
 816             "Thread", "BrowserThread::FILE");
 817         thread_to_start = &file_thread_;
 818 #if defined(OS_WIN)
 819         // On Windows, the FILE thread needs to be have a UI message loop
 820         // which pumps messages in such a way that Google Update can
 821         // communicate back to us.
 822         options = ui_message_loop_options;
 823 #else
 824         options = io_message_loop_options;
 825 #endif
 826         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 827         break;
 828       case BrowserThread::PROCESS_LAUNCHER:
 829         TRACE_EVENT_BEGIN1("startup",
 830             "BrowserMainLoop::CreateThreads:start",
 831             "Thread", "BrowserThread::PROCESS_LAUNCHER");
 832         thread_to_start = &process_launcher_thread_;
 833         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 834         break;
 835       case BrowserThread::CACHE:
 836         TRACE_EVENT_BEGIN1("startup",
 837             "BrowserMainLoop::CreateThreads:start",
 838             "Thread", "BrowserThread::CACHE");
 839         thread_to_start = &cache_thread_;
 840         options = io_message_loop_options;
 841         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 842         break;
 843       case BrowserThread::IO:
 844         TRACE_EVENT_BEGIN1("startup",
 845             "BrowserMainLoop::CreateThreads:start",
 846             "Thread", "BrowserThread::IO");
 847         thread_to_start = &io_thread_;
 848         options = io_message_loop_options;
 849 #if defined(OS_ANDROID)
 850         // Up the priority of the |io_thread_| as some of its IPCs relate to
 851         // display tasks.
 852         options.priority = base::ThreadPriority::DISPLAY;
 853 #endif
 854         break;
 855       case BrowserThread::UI:
 856       case BrowserThread::ID_COUNT:
 857       default:
 858         NOTREACHED();
 859         break;
 860     }
 861
 862     BrowserThread::ID id = static_cast<BrowserThread::ID>(thread_id);
 863
 864     if (thread_to_start) {
 865       (*thread_to_start).reset(new BrowserProcessSubThread(id));
 866       if (!(*thread_to_start)->StartWithOptions(options)) {
 867         LOG(FATAL) << "Failed to start the browser thread: id == " << id;
 868       }
 869     } else {
 870       NOTREACHED();
 871     }
 872
 873     TRACE_EVENT_END0("startup", "BrowserMainLoop::CreateThreads:start");
 874   }
 875   created_threads_ = true;
 876   return result_code_;
 877 }
 878
 879 int BrowserMainLoop::PreMainMessageLoopRun() {
 880   if (parts_) {
 881     TRACE_EVENT0("startup",
 882         "BrowserMainLoop::CreateThreads:PreMainMessageLoopRun");
 883     TRACK_SCOPED_REGION(
 884         "Startup", "BrowserMainLoop::PreMainMessageLoopRun");
 885
 886     parts_->PreMainMessageLoopRun();
 887   }
 888
 889   // If the UI thread blocks, the whole UI is unresponsive.
 890   // Do not allow disk IO from the UI thread.
 891   base::ThreadRestrictions::SetIOAllowed(false);
 892   base::ThreadRestrictions::DisallowWaiting();
 893   return result_code_;
 894 }
 895
 896 void BrowserMainLoop::RunMainMessageLoopParts() {
 897   TRACE_EVENT_BEGIN_ETW("BrowserMain:MESSAGE_LOOP", 0, "");
 898
 899   bool ran_main_loop = false;
 900   if (parts_)
 901     ran_main_loop = parts_->MainMessageLoopRun(&result_code_);
 902
 903   if (!ran_main_loop)
 904     MainMessageLoopRun();
 905
 906   TRACE_EVENT_END_ETW("BrowserMain:MESSAGE_LOOP", 0, "");
 907 }
 908
 909 void BrowserMainLoop::ShutdownThreadsAndCleanUp() {
 910   if (!created_threads_) {
 911     // Called early, nothing to do
 912     return;
 913   }
 914   TRACE_EVENT0("shutdown", "BrowserMainLoop::ShutdownThreadsAndCleanUp");
 915
 916   // Teardown may start in PostMainMessageLoopRun, and during teardown we
 917   // need to be able to perform IO.
 918   base::ThreadRestrictions::SetIOAllowed(true);
 919   BrowserThread::PostTask(
 920       BrowserThread::IO, FROM_HERE,
 921       base::Bind(base::IgnoreResult(&base::ThreadRestrictions::SetIOAllowed),
 922                  true));
 923
 924   mojo_shell_context_.reset();
 925
 926 #if !defined(OS_IOS)
 927   if (RenderProcessHost::run_renderer_in_process())
 928     RenderProcessHostImpl::ShutDownInProcessRenderer();
 929 #endif
 930
 931   if (parts_) {
 932     TRACE_EVENT0("shutdown",
 933                  "BrowserMainLoop::Subsystem:PostMainMessageLoopRun");
 934     parts_->PostMainMessageLoopRun();
 935   }
 936
 937 #if defined(USE_AURA)
 938   aura::Env::DeleteInstance();
 939 #endif
 940
 941   trace_memory_controller_.reset();
 942   system_stats_monitor_.reset();
 943
 944 #if !defined(OS_IOS)
 945   // Destroying the GpuProcessHostUIShims on the UI thread posts a task to
 946   // delete related objects on the GPU thread. This must be done before
 947   // stopping the GPU thread. The GPU thread will close IPC channels to renderer
 948   // processes so this has to happen before stopping the IO thread.
 949   {
 950     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:GPUProcessHostShim");
 951     GpuProcessHostUIShim::DestroyAll();
 952   }
 953   // Cancel pending requests and prevent new requests.
 954   if (resource_dispatcher_host_) {
 955     TRACE_EVENT0("shutdown",
 956                  "BrowserMainLoop::Subsystem:ResourceDispatcherHost");
 957     resource_dispatcher_host_.get()->Shutdown();
 958   }
 959
 960   memory_pressure_monitor_.reset();
 961
 962 #if defined(OS_MACOSX)
 963   BrowserCompositorMac::DisableRecyclingForShutdown();
 964 #endif
 965
 966 #if defined(USE_AURA) || defined(OS_MACOSX)
 967   {
 968     TRACE_EVENT0("shutdown",
 969                  "BrowserMainLoop::Subsystem:ImageTransportFactory");
 970     ImageTransportFactory::Terminate();
 971   }
 972 #endif
 973
 974 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 975   ZygoteHostImpl::GetInstance()->TearDownAfterLastChild();
 976 #endif  // defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 977
 978   // The device monitors are using |system_monitor_| as dependency, so delete
 979   // them before |system_monitor_| goes away.
 980   // On Mac and windows, the monitor needs to be destroyed on the same thread
 981   // as they were created. On Linux, the monitor will be deleted when IO thread
 982   // goes away.
 983 #if defined(OS_WIN)
 984   system_message_window_.reset();
 985 #elif defined(OS_MACOSX)
 986   device_monitor_mac_.reset();
 987 #endif
 988 #endif  // !defined(OS_IOS)
 989
 990   // Must be size_t so we can subtract from it.
 991   for (size_t thread_id = BrowserThread::ID_COUNT - 1;
 992        thread_id >= (BrowserThread::UI + 1);
 993        --thread_id) {
 994     // Find the thread object we want to stop. Looping over all valid
 995     // BrowserThread IDs and DCHECKing on a missing case in the switch
 996     // statement helps avoid a mismatch between this code and the
 997     // BrowserThread::ID enumeration.
 998     //
 999     // The destruction order is the reverse order of occurrence in the
1000     // BrowserThread::ID list. The rationale for the order is as
1001     // follows (need to be filled in a bit):
1002     //
1003     //
1004     // - The IO thread is the only user of the CACHE thread.
1005     //
1006     // - The PROCESS_LAUNCHER thread must be stopped after IO in case
1007     //   the IO thread posted a task to terminate a process on the
1008     //   process launcher thread.
1009     //
1010     // - (Not sure why DB stops last.)
1011     switch (thread_id) {
1012       case BrowserThread::DB: {
1013         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:DBThread");
1014         ResetThread_DB(db_thread_.Pass());
1015         break;
1016       }
1017       case BrowserThread::FILE: {
1018         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:FileThread");
1019 #if !defined(OS_IOS)
1020         // Clean up state that lives on or uses the file_thread_ before
1021         // it goes away.
1022         if (resource_dispatcher_host_)
1023           resource_dispatcher_host_.get()->save_file_manager()->Shutdown();
1024 #endif  // !defined(OS_IOS)
1025         ResetThread_FILE(file_thread_.Pass());
1026         break;
1027       }
1028       case BrowserThread::FILE_USER_BLOCKING: {
1029         TRACE_EVENT0("shutdown",
1030                       "BrowserMainLoop::Subsystem:FileUserBlockingThread");
1031         ResetThread_FILE_USER_BLOCKING(file_user_blocking_thread_.Pass());
1032         break;
1033       }
1034       case BrowserThread::PROCESS_LAUNCHER: {
1035         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:LauncherThread");
1036         ResetThread_PROCESS_LAUNCHER(process_launcher_thread_.Pass());
1037         break;
1038       }
1039       case BrowserThread::CACHE: {
1040         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:CacheThread");
1041         ResetThread_CACHE(cache_thread_.Pass());
1042         break;
1043       }
1044       case BrowserThread::IO: {
1045         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:IOThread");
1046         ResetThread_IO(io_thread_.Pass());
1047         break;
1048       }
1049       case BrowserThread::UI:
1050       case BrowserThread::ID_COUNT:
1051       default:
1052         NOTREACHED();
1053         break;
1054     }
1055   }
1056
1057 #if !defined(OS_IOS)
1058   {
1059     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:IndexedDBThread");
1060     ResetThread_IndexedDb(indexed_db_thread_.Pass());
1061   }
1062 #endif
1063
1064   // Close the blocking I/O pool after the other threads. Other threads such
1065   // as the I/O thread may need to schedule work like closing files or flushing
1066   // data during shutdown, so the blocking pool needs to be available. There
1067   // may also be slow operations pending that will blcok shutdown, so closing
1068   // it here (which will block until required operations are complete) gives
1069   // more head start for those operations to finish.
1070   {
1071     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:ThreadPool");
1072     BrowserThreadImpl::ShutdownThreadPool();
1073   }
1074
1075 #if !defined(OS_IOS)
1076   // Must happen after the IO thread is shutdown since this may be accessed from
1077   // it.
1078   {
1079     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:GPUChannelFactory");
1080     if (BrowserGpuChannelHostFactory::instance())
1081       BrowserGpuChannelHostFactory::Terminate();
1082   }
1083
1084   // Must happen after the I/O thread is shutdown since this class lives on the
1085   // I/O thread and isn't threadsafe.
1086   {
1087     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:GamepadService");
1088     GamepadService::GetInstance()->Terminate();
1089   }
1090   {
1091     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:SensorService");
1092     DeviceInertialSensorService::GetInstance()->Shutdown();
1093   }
1094 #if !defined(OS_ANDROID)
1095   {
1096     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:BatteryStatusService");
1097     device::BatteryStatusService::GetInstance()->Shutdown();
1098   }
1099 #endif
1100   {
1101     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:DeleteDataSources");
1102     URLDataManager::DeleteDataSources();
1103   }
1104 #endif  // !defined(OS_IOS)
1105
1106   if (parts_) {
1107     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:PostDestroyThreads");
1108     parts_->PostDestroyThreads();
1109   }
1110 }
1111
1112 void BrowserMainLoop::StopStartupTracingTimer() {
1113   startup_trace_timer_.Stop();
1114 }
1115
1116 void BrowserMainLoop::InitializeMainThread() {
1117   TRACE_EVENT0("startup", "BrowserMainLoop::InitializeMainThread");
1118   static const char kThreadName[] = "CrBrowserMain";
1119   base::PlatformThread::SetName(kThreadName);
1120   if (main_message_loop_)
1121     main_message_loop_->set_thread_name(kThreadName);
1122
1123   // Register the main thread by instantiating it, but don't call any methods.
1124   main_thread_.reset(
1125       new BrowserThreadImpl(BrowserThread::UI, base::MessageLoop::current()));
1126
1127   // TODO(erikchen): Temporary code to help track http://crbug.com/527588.
1128   IPC::Channel::SetMessageVerifier(
1129       &content::CheckContentsOfDataReceivedMessage);
1130 }
1131
1132 int BrowserMainLoop::BrowserThreadsStarted() {
1133   TRACE_EVENT0("startup", "BrowserMainLoop::BrowserThreadsStarted");
1134
1135 #if !defined(OS_IOS)
1136   indexed_db_thread_.reset(new base::Thread("IndexedDB"));
1137   indexed_db_thread_->Start();
1138 #endif
1139
1140 #if !defined(OS_IOS)
1141   HistogramSynchronizer::GetInstance();
1142
1143 #if defined(OS_ANDROID)
1144   // Up the priority of the UI thread.
1145   base::PlatformThread::SetCurrentThreadPriority(base::ThreadPriority::DISPLAY);
1146 #endif
1147
1148   bool always_uses_gpu = true;
1149   bool established_gpu_channel = false;
1150 #if defined(OS_ANDROID)
1151   // TODO(crbug.com/439322): This should be set to |true|.
1152   established_gpu_channel = false;
1153   BrowserGpuChannelHostFactory::Initialize(established_gpu_channel);
1154 #elif defined(USE_AURA) || defined(OS_MACOSX)
1155   established_gpu_channel = true;
1156   if (!GpuDataManagerImpl::GetInstance()->CanUseGpuBrowserCompositor() ||
1157       parsed_command_line_.HasSwitch(switches::kDisableGpuEarlyInit)) {
1158     established_gpu_channel = always_uses_gpu = false;
1159   }
1160   BrowserGpuChannelHostFactory::Initialize(established_gpu_channel);
1161   ImageTransportFactory::Initialize();
1162 #if defined(USE_AURA)
1163   if (aura::Env::GetInstance()) {
1164     aura::Env::GetInstance()->set_context_factory(GetContextFactory());
1165   }
1166 #endif  // defined(USE_AURA)
1167 #endif  // defined(OS_ANDROID)
1168
1169   // Enable the GpuMemoryBuffer dump provider with IO thread affinity. Note that
1170   // unregistration happens on the IO thread (See
1171   // BrowserProcessSubThread::IOThreadPreCleanUp).
1172   base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(
1173       BrowserGpuMemoryBufferManager::current(), io_thread_->task_runner());
1174
1175   {
1176     TRACE_EVENT0("startup", "BrowserThreadsStarted::Subsystem:AudioMan");
1177     audio_manager_.reset(media::AudioManager::CreateWithHangTimer(
1178         MediaInternals::GetInstance(), io_thread_->task_runner()));
1179   }
1180
1181   {
1182     TRACE_EVENT0("startup", "BrowserThreadsStarted::Subsystem:MidiManager");
1183     midi_manager_.reset(media::midi::MidiManager::Create());
1184   }
1185
1186 #if defined(OS_LINUX) && defined(USE_UDEV)
1187   device_monitor_linux_.reset(new DeviceMonitorLinux());
1188 #elif defined(OS_MACOSX)
1189   device_monitor_mac_.reset(new DeviceMonitorMac());
1190 #endif
1191
1192 #if defined(OS_WIN)
1193   UMA_HISTOGRAM_BOOLEAN("Windows.Win32kRendererLockdown",
1194                         IsWin32kRendererLockdownEnabled());
1195 #endif
1196   // RDH needs the IO thread to be created
1197   {
1198     TRACE_EVENT0("startup",
1199       "BrowserMainLoop::BrowserThreadsStarted:InitResourceDispatcherHost");
1200     resource_dispatcher_host_.reset(new ResourceDispatcherHostImpl());
1201   }
1202
1203   // MediaStreamManager needs the IO thread to be created.
1204   {
1205     TRACE_EVENT0("startup",
1206       "BrowserMainLoop::BrowserThreadsStarted:InitMediaStreamManager");
1207     media_stream_manager_.reset(new MediaStreamManager(audio_manager_.get()));
1208   }
1209
1210   {
1211     TRACE_EVENT0("startup",
1212       "BrowserMainLoop::BrowserThreadsStarted:InitSpeechRecognition");
1213     speech_recognition_manager_.reset(new SpeechRecognitionManagerImpl(
1214         audio_manager_.get(), media_stream_manager_.get()));
1215   }
1216
1217   {
1218     TRACE_EVENT0(
1219         "startup",
1220         "BrowserMainLoop::BrowserThreadsStarted::InitUserInputMonitor");
1221     user_input_monitor_ = media::UserInputMonitor::Create(
1222         io_thread_->task_runner(), main_thread_->task_runner());
1223   }
1224
1225   {
1226     TRACE_EVENT0("startup",
1227                  "BrowserMainLoop::BrowserThreadsStarted::TimeZoneMonitor");
1228     time_zone_monitor_ = TimeZoneMonitor::Create();
1229   }
1230
1231   // Alert the clipboard class to which threads are allowed to access the
1232   // clipboard:
1233   std::vector<base::PlatformThreadId> allowed_clipboard_threads;
1234   // The current thread is the UI thread.
1235   allowed_clipboard_threads.push_back(base::PlatformThread::CurrentId());
1236 #if defined(OS_WIN)
1237   // On Windows, clipboards are also used on the FILE or IO threads.
1238   allowed_clipboard_threads.push_back(file_thread_->GetThreadId());
1239   allowed_clipboard_threads.push_back(io_thread_->GetThreadId());
1240 #endif
1241   ui::Clipboard::SetAllowedThreads(allowed_clipboard_threads);
1242
1243   // When running the GPU thread in-process, avoid optimistically starting it
1244   // since creating the GPU thread races against creation of the one-and-only
1245   // ChildProcess instance which is created by the renderer thread.
1246   if (GpuDataManagerImpl::GetInstance()->GpuAccessAllowed(NULL) &&
1247       !established_gpu_channel &&
1248       always_uses_gpu &&
1249       !UsingInProcessGpu()) {
1250     TRACE_EVENT_INSTANT0("gpu", "Post task to launch GPU process",
1251                          TRACE_EVENT_SCOPE_THREAD);
1252     BrowserThread::PostTask(
1253         BrowserThread::IO, FROM_HERE,
1254         base::Bind(base::IgnoreResult(&GpuProcessHost::Get),
1255                    GpuProcessHost::GPU_PROCESS_KIND_SANDBOXED,
1256                    CAUSE_FOR_GPU_LAUNCH_BROWSER_STARTUP));
1257   }
1258
1259 #if defined(OS_MACOSX)
1260   ThemeHelperMac::GetInstance();
1261   SystemHotkeyHelperMac::GetInstance()->DeferredLoadSystemHotkeys();
1262 #endif  // defined(OS_MACOSX)
1263
1264 #endif  // !defined(OS_IOS)
1265
1266   mojo_shell_context_.reset(new MojoShellContext);
1267
1268   return result_code_;
1269 }
1270
1271 bool BrowserMainLoop::UsingInProcessGpu() const {
1272   return parsed_command_line_.HasSwitch(switches::kSingleProcess) ||
1273          parsed_command_line_.HasSwitch(switches::kInProcessGPU);
1274 }
1275
1276 bool BrowserMainLoop::InitializeToolkit() {
1277   TRACE_EVENT0("startup", "BrowserMainLoop::InitializeToolkit");
1278   TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::InitializeToolkit");
1279
1280   // TODO(evan): this function is rather subtle, due to the variety
1281   // of intersecting ifdefs we have.  To keep it easy to follow, there
1282   // are no #else branches on any #ifs.
1283   // TODO(stevenjb): Move platform specific code into platform specific Parts
1284   // (Need to add InitializeToolkit stage to BrowserParts).
1285   // See also GTK setup in EarlyInitialization, above, and associated comments.
1286
1287 #if defined(OS_WIN)
1288   // Init common control sex.
1289   INITCOMMONCONTROLSEX config;
1290   config.dwSize = sizeof(config);
1291   config.dwICC = ICC_WIN95_CLASSES;
1292   if (!InitCommonControlsEx(&config))
1293     PLOG(FATAL);
1294 #endif
1295
1296 #if defined(USE_AURA)
1297
1298 #if defined(USE_X11)
1299   if (!gfx::GetXDisplay())
1300     return false;
1301 #endif
1302
1303   // Env creates the compositor. Aura widgets need the compositor to be created
1304   // before they can be initialized by the browser.
1305   aura::Env::CreateInstance(true);
1306 #endif  // defined(USE_AURA)
1307
1308   if (parts_)
1309     parts_->ToolkitInitialized();
1310
1311   return true;
1312 }
1313
1314 void BrowserMainLoop::MainMessageLoopRun() {
1315 #if defined(OS_ANDROID)
1316   // Android's main message loop is the Java message loop.
1317   NOTREACHED();
1318 #else
1319   DCHECK(base::MessageLoopForUI::IsCurrent());
1320   if (parameters_.ui_task) {
1321     base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE,
1322                                                   *parameters_.ui_task);
1323   }
1324
1325   base::RunLoop run_loop;
1326   run_loop.Run();
1327 #endif
1328 }
1329
1330 base::FilePath BrowserMainLoop::GetStartupTraceFileName(
1331     const base::CommandLine& command_line) const {
1332   base::FilePath trace_file;
1333   if (command_line.HasSwitch(switches::kTraceStartup)) {
1334     trace_file = command_line.GetSwitchValuePath(
1335         switches::kTraceStartupFile);
1336     // trace_file = "none" means that startup events will show up for the next
1337     // begin/end tracing (via about:tracing or AutomationProxy::BeginTracing/
1338     // EndTracing, for example).
1339     if (trace_file == base::FilePath().AppendASCII("none"))
1340       return trace_file;
1341
1342     if (trace_file.empty()) {
1343 #if defined(OS_ANDROID)
1344       TracingControllerAndroid::GenerateTracingFilePath(&trace_file);
1345 #else
1346       // Default to saving the startup trace into the current dir.
1347       trace_file = base::FilePath().AppendASCII("chrometrace.log");
1348 #endif
1349     }
1350   } else {
1351 #if defined(OS_ANDROID)
1352     TracingControllerAndroid::GenerateTracingFilePath(&trace_file);
1353 #else
1354     trace_file = tracing::TraceConfigFile::GetInstance()->GetResultFile();
1355 #endif
1356   }
1357
1358   return trace_file;
1359 }
1360
1361 void BrowserMainLoop::InitStartupTracingForDuration(
1362     const base::CommandLine& command_line) {
1363   DCHECK(is_tracing_startup_for_duration_);
1364
1365   // Initialize the tracing controller, required for memory tracing.
1366   TracingController::GetInstance();
1367
1368   startup_trace_file_ = GetStartupTraceFileName(parsed_command_line_);
1369
1370   int delay_secs = 5;
1371   if (command_line.HasSwitch(switches::kTraceStartup)) {
1372     std::string delay_str = command_line.GetSwitchValueASCII(
1373         switches::kTraceStartupDuration);
1374     if (!delay_str.empty() && !base::StringToInt(delay_str, &delay_secs)) {
1375       DLOG(WARNING) << "Could not parse --" << switches::kTraceStartupDuration
1376           << "=" << delay_str << " defaulting to 5 (secs)";
1377       delay_secs = 5;
1378     }
1379   } else {
1380     delay_secs = tracing::TraceConfigFile::GetInstance()->GetStartupDuration();
1381   }
1382
1383   startup_trace_timer_.Start(FROM_HERE,
1384                              base::TimeDelta::FromSeconds(delay_secs),
1385                              this,
1386                              &BrowserMainLoop::EndStartupTracing);
1387 }
1388
1389 void BrowserMainLoop::EndStartupTracing() {
1390   DCHECK(is_tracing_startup_for_duration_);
1391
1392   is_tracing_startup_for_duration_ = false;
1393   TracingController::GetInstance()->DisableRecording(
1394       TracingController::CreateFileSink(
1395           startup_trace_file_,
1396           base::Bind(OnStoppedStartupTracing, startup_trace_file_)));
1397 }
1398
1399 }  // namespace content