content/browser/browser_main_loop.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/browser/browser_main_loop.h"
   6
   7 #include "base/bind.h"
   8 #include "base/command_line.h"
   9 #include "base/location.h"
  10 #include "base/logging.h"
  11 #include "base/memory/memory_pressure_monitor.h"
  12 #include "base/metrics/field_trial.h"
  13 #include "base/metrics/histogram.h"
  14 #include "base/pending_task.h"
  15 #include "base/power_monitor/power_monitor.h"
  16 #include "base/power_monitor/power_monitor_device_source.h"
  17 #include "base/process/process_metrics.h"
  18 #include "base/profiler/scoped_profile.h"
  19 #include "base/run_loop.h"
  20 #include "base/single_thread_task_runner.h"
  21 #include "base/strings/string_number_conversions.h"
  22 #include "base/strings/string_split.h"
  23 #include "base/system_monitor/system_monitor.h"
  24 #include "base/thread_task_runner_handle.h"
  25 #include "base/threading/thread_restrictions.h"
  26 #include "base/timer/hi_res_timer_manager.h"
  27 #include "base/trace_event/memory_dump_manager.h"
  28 #include "base/trace_event/trace_event.h"
  29 #include "components/tracing/trace_config_file.h"
  30 #include "components/tracing/tracing_switches.h"
  31 #include "content/browser/browser_thread_impl.h"
  32 #include "content/browser/device_sensors/device_inertial_sensor_service.h"
  33 #include "content/browser/dom_storage/dom_storage_area.h"
  34 #include "content/browser/download/save_file_manager.h"
  35 #include "content/browser/gamepad/gamepad_service.h"
  36 #include "content/browser/gpu/browser_gpu_channel_host_factory.h"
  37 #include "content/browser/gpu/browser_gpu_memory_buffer_manager.h"
  38 #include "content/browser/gpu/compositor_util.h"
  39 #include "content/browser/gpu/gpu_data_manager_impl.h"
  40 #include "content/browser/gpu/gpu_process_host.h"
  41 #include "content/browser/gpu/gpu_process_host_ui_shim.h"
  42 #include "content/browser/histogram_synchronizer.h"
  43 #include "content/browser/loader/resource_dispatcher_host_impl.h"
  44 #include "content/browser/media/media_internals.h"
  45 #include "content/browser/mojo/mojo_shell_context.h"
  46 #include "content/browser/net/browser_online_state_observer.h"
  47 #include "content/browser/renderer_host/media/media_stream_manager.h"
  48 #include "content/browser/speech/speech_recognition_manager_impl.h"
  49 #include "content/browser/startup_task_runner.h"
  50 #include "content/browser/time_zone_monitor.h"
  51 #include "content/browser/webui/content_web_ui_controller_factory.h"
  52 #include "content/browser/webui/url_data_manager.h"
  53 #include "content/common/content_switches_internal.h"
  54 #include "content/common/host_discardable_shared_memory_manager.h"
  55 #include "content/common/host_shared_bitmap_manager.h"
  56 #include "content/public/browser/browser_main_parts.h"
  57 #include "content/public/browser/content_browser_client.h"
  58 #include "content/public/browser/render_process_host.h"
  59 #include "content/public/browser/tracing_controller.h"
  60 #include "content/public/common/content_switches.h"
  61 #include "content/public/common/main_function_params.h"
  62 #include "content/public/common/result_codes.h"
  63 #include "crypto/nss_util.h"
  64 #include "device/battery/battery_status_service.h"
  65 #include "media/audio/audio_manager.h"
  66 #include "media/base/media.h"
  67 #include "media/base/user_input_monitor.h"
  68 #include "media/midi/midi_manager.h"
  69 #include "net/base/network_change_notifier.h"
  70 #include "net/socket/client_socket_factory.h"
  71 #include "net/ssl/ssl_config_service.h"
  72 #include "skia/ext/skia_memory_dump_provider.h"
  73 #include "ui/base/clipboard/clipboard.h"
  74
  75 #if defined(USE_AURA) || (defined(OS_MACOSX) && !defined(OS_IOS))
  76 #include "content/browser/compositor/image_transport_factory.h"
  77 #endif
  78
  79 #if defined(USE_AURA)
  80 #include "content/public/browser/context_factory.h"
  81 #include "ui/aura/env.h"
  82 #endif
  83
  84 #if !defined(OS_IOS)
  85 #include "content/browser/renderer_host/render_process_host_impl.h"
  86 #endif
  87
  88 #if defined(OS_ANDROID)
  89 #include "base/android/jni_android.h"
  90 #include "content/browser/android/browser_startup_controller.h"
  91 #include "content/browser/android/browser_surface_texture_manager.h"
  92 #include "content/browser/android/in_process_surface_texture_manager.h"
  93 #include "content/browser/android/tracing_controller_android.h"
  94 #include "content/browser/screen_orientation/screen_orientation_delegate_android.h"
  95 #include "content/public/browser/screen_orientation_provider.h"
  96 #include "ui/gl/gl_surface.h"
  97 #endif
  98
  99 #if defined(OS_MACOSX)
 100 #include "media/base/mac/avfoundation_glue.h"
 101 #endif
 102
 103 #if defined(OS_MACOSX) && !defined(OS_IOS)
 104 #include "base/memory/memory_pressure_monitor_mac.h"
 105 #include "content/browser/bootstrap_sandbox_manager_mac.h"
 106 #include "content/browser/browser_io_surface_manager_mac.h"
 107 #include "content/browser/cocoa/system_hotkey_helper_mac.h"
 108 #include "content/browser/compositor/browser_compositor_view_mac.h"
 109 #include "content/browser/in_process_io_surface_manager_mac.h"
 110 #include "content/browser/theme_helper_mac.h"
 111 #endif
 112
 113 #if defined(USE_OZONE)
 114 #include "ui/ozone/public/client_native_pixmap_factory.h"
 115 #include "ui/ozone/public/ozone_platform.h"
 116 #endif
 117
 118 #if defined(OS_WIN)
 119 #include <windows.h>
 120 #include <commctrl.h>
 121 #include <shellapi.h>
 122
 123 #include "base/memory/memory_pressure_monitor_win.h"
 124 #include "content/browser/system_message_window_win.h"
 125 #include "content/common/sandbox_win.h"
 126 #include "net/base/winsock_init.h"
 127 #include "ui/base/l10n/l10n_util_win.h"
 128 #endif
 129
 130 #if defined(OS_CHROMEOS)
 131 #include "base/memory/memory_pressure_monitor_chromeos.h"
 132 #include "chromeos/chromeos_switches.h"
 133 #endif
 134
 135 #if defined(USE_GLIB)
 136 #include <glib-object.h>
 137 #endif
 138
 139 #if defined(OS_LINUX) && defined(USE_UDEV)
 140 #include "content/browser/device_monitor_udev.h"
 141 #elif defined(OS_MACOSX) && !defined(OS_IOS)
 142 #include "content/browser/device_monitor_mac.h"
 143 #endif
 144
 145 #if defined(OS_POSIX) && !defined(OS_MACOSX)
 146 #include "content/browser/renderer_host/render_sandbox_host_linux.h"
 147 #include "content/browser/zygote_host/zygote_host_impl_linux.h"
 148 #include "sandbox/linux/suid/client/setuid_sandbox_host.h"
 149 #endif
 150
 151 #if defined(ENABLE_PLUGINS)
 152 #include "content/browser/plugin_service_impl.h"
 153 #endif
 154
 155 #if defined(TCMALLOC_TRACE_MEMORY_SUPPORTED)
 156 #include "third_party/tcmalloc/chromium/src/gperftools/heap-profiler.h"
 157 #endif
 158
 159 #if defined(USE_X11)
 160 #include "ui/gfx/x/x11_connection.h"
 161 #include "ui/gfx/x/x11_types.h"
 162 #endif
 163
 164 // One of the linux specific headers defines this as a macro.
 165 #ifdef DestroyAll
 166 #undef DestroyAll
 167 #endif
 168
 169 namespace content {
 170 namespace {
 171
 172 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 173 void SetupSandbox(const base::CommandLine& parsed_command_line) {
 174   TRACE_EVENT0("startup", "SetupSandbox");
 175   base::FilePath sandbox_binary;
 176
 177   scoped_ptr<sandbox::SetuidSandboxHost> setuid_sandbox_host(
 178       sandbox::SetuidSandboxHost::Create());
 179
 180   const bool want_setuid_sandbox =
 181       !parsed_command_line.HasSwitch(switches::kNoSandbox) &&
 182       !parsed_command_line.HasSwitch(switches::kDisableSetuidSandbox) &&
 183       !setuid_sandbox_host->IsDisabledViaEnvironment();
 184
 185   static const char no_suid_error[] =
 186       "Running without the SUID sandbox! See "
 187       "https://code.google.com/p/chromium/wiki/LinuxSUIDSandboxDevelopment "
 188       "for more information on developing with the sandbox on.";
 189   if (want_setuid_sandbox) {
 190     sandbox_binary = setuid_sandbox_host->GetSandboxBinaryPath();
 191     if (sandbox_binary.empty()) {
 192       // This needs to be fatal. Talk to security@chromium.org if you feel
 193       // otherwise.
 194       LOG(FATAL) << no_suid_error;
 195     }
 196   } else {
 197     LOG(ERROR) << no_suid_error;
 198   }
 199
 200   // Tickle the sandbox host and zygote host so they fork now.
 201   RenderSandboxHostLinux::GetInstance()->Init();
 202   ZygoteHostImpl::GetInstance()->Init(sandbox_binary.value());
 203 }
 204 #endif
 205
 206 #if defined(USE_GLIB)
 207 static void GLibLogHandler(const gchar* log_domain,
 208                            GLogLevelFlags log_level,
 209                            const gchar* message,
 210                            gpointer userdata) {
 211   if (!log_domain)
 212     log_domain = "<unknown>";
 213   if (!message)
 214     message = "<no message>";
 215
 216   if (strstr(message, "Unable to retrieve the file info for")) {
 217     LOG(ERROR) << "GTK File code error: " << message;
 218   } else if (strstr(message, "Could not find the icon") &&
 219              strstr(log_domain, "Gtk")) {
 220     LOG(ERROR) << "GTK icon error: " << message;
 221   } else if (strstr(message, "Theme file for default has no") ||
 222              strstr(message, "Theme directory") ||
 223              strstr(message, "theme pixmap") ||
 224              strstr(message, "locate theme engine")) {
 225     LOG(ERROR) << "GTK theme error: " << message;
 226   } else if (strstr(message, "Unable to create Ubuntu Menu Proxy") &&
 227              strstr(log_domain, "<unknown>")) {
 228     LOG(ERROR) << "GTK menu proxy create failed";
 229   } else if (strstr(message, "Out of memory") &&
 230              strstr(log_domain, "<unknown>")) {
 231     LOG(ERROR) << "DBus call timeout or out of memory: "
 232                << "http://crosbug.com/15496";
 233   } else if (strstr(message, "Could not connect: Connection refused") &&
 234              strstr(log_domain, "<unknown>")) {
 235     LOG(ERROR) << "DConf settings backend could not connect to session bus: "
 236                << "http://crbug.com/179797";
 237   } else if (strstr(message, "Attempting to store changes into") ||
 238              strstr(message, "Attempting to set the permissions of")) {
 239     LOG(ERROR) << message << " (http://bugs.chromium.org/161366)";
 240   } else if (strstr(message, "drawable is not a native X11 window")) {
 241     LOG(ERROR) << message << " (http://bugs.chromium.org/329991)";
 242   } else if (strstr(message, "Cannot do system-bus activation with no user")) {
 243     LOG(ERROR) << message << " (http://crbug.com/431005)";
 244   } else if (strstr(message, "deprecated")) {
 245     LOG(ERROR) << message;
 246   } else {
 247     LOG(DFATAL) << log_domain << ": " << message;
 248   }
 249 }
 250
 251 static void SetUpGLibLogHandler() {
 252   // Register GLib-handled assertions to go through our logging system.
 253   const char* kLogDomains[] = { NULL, "Gtk", "Gdk", "GLib", "GLib-GObject" };
 254   for (size_t i = 0; i < arraysize(kLogDomains); i++) {
 255     g_log_set_handler(kLogDomains[i],
 256                       static_cast<GLogLevelFlags>(G_LOG_FLAG_RECURSION |
 257                                                   G_LOG_FLAG_FATAL |
 258                                                   G_LOG_LEVEL_ERROR |
 259                                                   G_LOG_LEVEL_CRITICAL |
 260                                                   G_LOG_LEVEL_WARNING),
 261                       GLibLogHandler,
 262                       NULL);
 263   }
 264 }
 265 #endif
 266
 267 void OnStoppedStartupTracing(const base::FilePath& trace_file) {
 268   VLOG(0) << "Completed startup tracing to " << trace_file.value();
 269 }
 270
 271 // Disable optimizations for this block of functions so the compiler doesn't
 272 // merge them all together. This makes it possible to tell what thread was
 273 // unresponsive by inspecting the callstack.
 274 MSVC_DISABLE_OPTIMIZE()
 275 MSVC_PUSH_DISABLE_WARNING(4748)
 276
 277 NOINLINE void ResetThread_DB(scoped_ptr<BrowserProcessSubThread> thread) {
 278   volatile int inhibit_comdat = __LINE__;
 279   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 280   thread.reset();
 281 }
 282
 283 NOINLINE void ResetThread_FILE(scoped_ptr<BrowserProcessSubThread> thread) {
 284   volatile int inhibit_comdat = __LINE__;
 285   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 286   thread.reset();
 287 }
 288
 289 NOINLINE void ResetThread_FILE_USER_BLOCKING(
 290     scoped_ptr<BrowserProcessSubThread> thread) {
 291   volatile int inhibit_comdat = __LINE__;
 292   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 293   thread.reset();
 294 }
 295
 296 NOINLINE void ResetThread_PROCESS_LAUNCHER(
 297     scoped_ptr<BrowserProcessSubThread> thread) {
 298   volatile int inhibit_comdat = __LINE__;
 299   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 300   thread.reset();
 301 }
 302
 303 NOINLINE void ResetThread_CACHE(scoped_ptr<BrowserProcessSubThread> thread) {
 304   volatile int inhibit_comdat = __LINE__;
 305   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 306   thread.reset();
 307 }
 308
 309 NOINLINE void ResetThread_IO(scoped_ptr<BrowserProcessSubThread> thread) {
 310   volatile int inhibit_comdat = __LINE__;
 311   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 312   thread.reset();
 313 }
 314
 315 #if !defined(OS_IOS)
 316 NOINLINE void ResetThread_IndexedDb(scoped_ptr<base::Thread> thread) {
 317   volatile int inhibit_comdat = __LINE__;
 318   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 319   thread.reset();
 320 }
 321 #endif
 322
 323 MSVC_POP_WARNING()
 324 MSVC_ENABLE_OPTIMIZE();
 325
 326 #if defined(OS_WIN)
 327 // Creates a memory pressure monitor using automatic thresholds, or those
 328 // specified on the command-line. Ownership is passed to the caller.
 329 base::win::MemoryPressureMonitor* CreateWinMemoryPressureMonitor(
 330     const base::CommandLine& parsed_command_line) {
 331   std::vector<std::string> thresholds = base::SplitString(
 332       parsed_command_line.GetSwitchValueASCII(
 333           switches::kMemoryPressureThresholdsMb),
 334       ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
 335
 336   int moderate_threshold_mb = 0;
 337   int critical_threshold_mb = 0;
 338   if (thresholds.size() == 2 &&
 339       base::StringToInt(thresholds[0], &moderate_threshold_mb) &&
 340       base::StringToInt(thresholds[1], &critical_threshold_mb) &&
 341       moderate_threshold_mb >= critical_threshold_mb &&
 342       critical_threshold_mb >= 0) {
 343     return new base::win::MemoryPressureMonitor(moderate_threshold_mb,
 344                                                 critical_threshold_mb);
 345   }
 346
 347   // In absence of valid switches use the automatic defaults.
 348   return new base::win::MemoryPressureMonitor();
 349 }
 350 #endif  // defined(OS_WIN)
 351
 352 }  // namespace
 353
 354 // The currently-running BrowserMainLoop.  There can be one or zero.
 355 BrowserMainLoop* g_current_browser_main_loop = NULL;
 356
 357 // For measuring memory usage after each task. Behind a command line flag.
 358 class BrowserMainLoop::MemoryObserver : public base::MessageLoop::TaskObserver {
 359  public:
 360   MemoryObserver() {}
 361   ~MemoryObserver() override {}
 362
 363   void WillProcessTask(const base::PendingTask& pending_task) override {}
 364
 365   void DidProcessTask(const base::PendingTask& pending_task) override {
 366 #if !defined(OS_IOS)  // No ProcessMetrics on IOS.
 367     scoped_ptr<base::ProcessMetrics> process_metrics(
 368         base::ProcessMetrics::CreateProcessMetrics(
 369 #if defined(OS_MACOSX)
 370             base::GetCurrentProcessHandle(), NULL));
 371 #else
 372             base::GetCurrentProcessHandle()));
 373 #endif
 374     size_t private_bytes;
 375     process_metrics->GetMemoryBytes(&private_bytes, NULL);
 376     LOCAL_HISTOGRAM_MEMORY_KB("Memory.BrowserUsed", private_bytes >> 10);
 377 #endif
 378   }
 379  private:
 380   DISALLOW_COPY_AND_ASSIGN(MemoryObserver);
 381 };
 382
 383
 384 // BrowserMainLoop construction / destruction =============================
 385
 386 BrowserMainLoop* BrowserMainLoop::GetInstance() {
 387   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 388   return g_current_browser_main_loop;
 389 }
 390
 391 BrowserMainLoop::BrowserMainLoop(const MainFunctionParams& parameters)
 392     : parameters_(parameters),
 393       parsed_command_line_(parameters.command_line),
 394       result_code_(RESULT_CODE_NORMAL_EXIT),
 395       created_threads_(false),
 396       // ContentMainRunner should have enabled tracing of the browser process
 397       // when kTraceStartup or kTraceConfigFile is in the command line.
 398       is_tracing_startup_for_duration_(
 399           parameters.command_line.HasSwitch(switches::kTraceStartup) ||
 400           (tracing::TraceConfigFile::GetInstance()->IsEnabled() &&
 401            tracing::TraceConfigFile::GetInstance()->GetStartupDuration() > 0)) {
 402   DCHECK(!g_current_browser_main_loop);
 403   g_current_browser_main_loop = this;
 404 }
 405
 406 BrowserMainLoop::~BrowserMainLoop() {
 407   DCHECK_EQ(this, g_current_browser_main_loop);
 408 #if !defined(OS_IOS)
 409   ui::Clipboard::DestroyClipboardForCurrentThread();
 410 #endif  // !defined(OS_IOS)
 411   g_current_browser_main_loop = NULL;
 412 }
 413
 414 void BrowserMainLoop::Init() {
 415   TRACE_EVENT0("startup", "BrowserMainLoop::Init");
 416   TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::Init");
 417
 418   parts_.reset(
 419       GetContentClient()->browser()->CreateBrowserMainParts(parameters_));
 420 }
 421
 422 // BrowserMainLoop stages ==================================================
 423
 424 void BrowserMainLoop::EarlyInitialization() {
 425   TRACE_EVENT0("startup", "BrowserMainLoop::EarlyInitialization");
 426   TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::EarlyInitialization");
 427
 428 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 429   // No thread should be created before this call, as SetupSandbox()
 430   // will end-up using fork().
 431   SetupSandbox(parsed_command_line_);
 432 #endif
 433
 434 #if defined(USE_X11)
 435   if (UsingInProcessGpu()) {
 436     if (!gfx::InitializeThreadedX11()) {
 437       LOG(ERROR) << "Failed to put Xlib into threaded mode.";
 438     }
 439   }
 440 #endif
 441
 442   // GLib's spawning of new processes is buggy, so it's important that at this
 443   // point GLib does not need to start DBUS. Chrome should always start with
 444   // DBUS_SESSION_BUS_ADDRESS properly set. See crbug.com/309093.
 445 #if defined(USE_GLIB)
 446   // g_type_init will be deprecated in 2.36. 2.35 is the development
 447   // version for 2.36, hence do not call g_type_init starting 2.35.
 448   // http://developer.gnome.org/gobject/unstable/gobject-Type-Information.html#g-type-init
 449 #if !GLIB_CHECK_VERSION(2, 35, 0)
 450   // GLib type system initialization. Needed at least for gconf,
 451   // used in net/proxy/proxy_config_service_linux.cc. Most likely
 452   // this is superfluous as gtk_init() ought to do this. It's
 453   // definitely harmless, so retained as a reminder of this
 454   // requirement for gconf.
 455   g_type_init();
 456 #endif
 457
 458   SetUpGLibLogHandler();
 459 #endif
 460
 461   if (parts_)
 462     parts_->PreEarlyInitialization();
 463
 464 #if defined(OS_MACOSX)
 465   // We use quite a few file descriptors for our IPC, and the default limit on
 466   // the Mac is low (256), so bump it up.
 467   base::SetFdLimit(1024);
 468 #endif
 469
 470 #if defined(OS_WIN)
 471   net::EnsureWinsockInit();
 472 #endif
 473
 474 #if defined(USE_NSS_CERTS) || !defined(USE_OPENSSL)
 475   // We want to be sure to init NSPR on the main thread.
 476   crypto::EnsureNSPRInit();
 477 #endif
 478
 479 #if !defined(OS_IOS)
 480   if (parsed_command_line_.HasSwitch(switches::kRendererProcessLimit)) {
 481     std::string limit_string = parsed_command_line_.GetSwitchValueASCII(
 482         switches::kRendererProcessLimit);
 483     size_t process_limit;
 484     if (base::StringToSizeT(limit_string, &process_limit)) {
 485       RenderProcessHost::SetMaxRendererProcessCount(process_limit);
 486     }
 487   }
 488 #endif  // !defined(OS_IOS)
 489
 490   // TODO(boliu): kSingleProcess check is a temporary workaround for
 491   // in-process Android WebView. crbug.com/503724 tracks proper fix.
 492   if (!parsed_command_line_.HasSwitch(switches::kSingleProcess)) {
 493     base::DiscardableMemoryAllocator::SetInstance(
 494         HostDiscardableSharedMemoryManager::current());
 495   }
 496
 497   if (parts_)
 498     parts_->PostEarlyInitialization();
 499 }
 500
 501 void BrowserMainLoop::PreMainMessageLoopStart() {
 502   if (parts_) {
 503     TRACE_EVENT0("startup",
 504         "BrowserMainLoop::MainMessageLoopStart:PreMainMessageLoopStart");
 505     parts_->PreMainMessageLoopStart();
 506   }
 507
 508 #if defined(OS_WIN)
 509   // If we're running tests (ui_task is non-null), then the ResourceBundle
 510   // has already been initialized.
 511   if (!parameters_.ui_task) {
 512     // Override the configured locale with the user's preferred UI language.
 513     l10n_util::OverrideLocaleWithUILanguageList();
 514   }
 515 #endif
 516 }
 517
 518 void BrowserMainLoop::MainMessageLoopStart() {
 519   // DO NOT add more code here. Use PreMainMessageLoopStart() above or
 520   // PostMainMessageLoopStart() below.
 521
 522   TRACE_EVENT0("startup", "BrowserMainLoop::MainMessageLoopStart");
 523   TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::MainMessageLoopStart");
 524
 525   // Create a MessageLoop if one does not already exist for the current thread.
 526   if (!base::MessageLoop::current())
 527     main_message_loop_.reset(new base::MessageLoopForUI);
 528
 529   InitializeMainThread();
 530 }
 531
 532 void BrowserMainLoop::PostMainMessageLoopStart() {
 533   {
 534     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:SystemMonitor");
 535     system_monitor_.reset(new base::SystemMonitor);
 536   }
 537   {
 538     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:PowerMonitor");
 539     scoped_ptr<base::PowerMonitorSource> power_monitor_source(
 540       new base::PowerMonitorDeviceSource());
 541     power_monitor_.reset(new base::PowerMonitor(power_monitor_source.Pass()));
 542   }
 543   {
 544     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:HighResTimerManager");
 545     hi_res_timer_manager_.reset(new base::HighResolutionTimerManager);
 546   }
 547   {
 548     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:NetworkChangeNotifier");
 549     network_change_notifier_.reset(net::NetworkChangeNotifier::Create());
 550   }
 551
 552 #if !defined(OS_IOS)
 553   {
 554     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:MediaFeatures");
 555     media::InitializeMediaLibrary();
 556   }
 557   {
 558     TRACE_EVENT0("startup",
 559                  "BrowserMainLoop::Subsystem:ContentWebUIController");
 560     WebUIControllerFactory::RegisterFactory(
 561         ContentWebUIControllerFactory::GetInstance());
 562   }
 563
 564   {
 565     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:OnlineStateObserver");
 566     online_state_observer_.reset(new BrowserOnlineStateObserver);
 567   }
 568
 569   {
 570     system_stats_monitor_.reset(
 571         new base::trace_event::TraceEventSystemStatsMonitor(
 572             base::ThreadTaskRunnerHandle::Get()));
 573   }
 574 #endif  // !defined(OS_IOS)
 575
 576 #if defined(OS_WIN)
 577   system_message_window_.reset(new SystemMessageWindowWin);
 578 #endif
 579
 580   if (parts_)
 581     parts_->PostMainMessageLoopStart();
 582
 583 #if !defined(OS_IOS)
 584   // Start tracing to a file if needed. Only do this after starting the main
 585   // message loop to avoid calling MessagePumpForUI::ScheduleWork() before
 586   // MessagePumpForUI::Start() as it will crash the browser.
 587   if (is_tracing_startup_for_duration_) {
 588     TRACE_EVENT0("startup", "BrowserMainLoop::InitStartupTracingForDuration");
 589     InitStartupTracingForDuration(parsed_command_line_);
 590   }
 591 #endif  // !defined(OS_IOS)
 592
 593 #if defined(OS_ANDROID)
 594   {
 595     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:SurfaceTextureManager");
 596     if (parsed_command_line_.HasSwitch(switches::kSingleProcess)) {
 597       SurfaceTextureManager::SetInstance(
 598           InProcessSurfaceTextureManager::GetInstance());
 599     } else {
 600       SurfaceTextureManager::SetInstance(
 601           BrowserSurfaceTextureManager::GetInstance());
 602     }
 603   }
 604
 605   if (!parsed_command_line_.HasSwitch(
 606       switches::kDisableScreenOrientationLock)) {
 607     TRACE_EVENT0("startup",
 608                  "BrowserMainLoop::Subsystem:ScreenOrientationProvider");
 609     screen_orientation_delegate_.reset(
 610         new ScreenOrientationDelegateAndroid());
 611     ScreenOrientationProvider::SetDelegate(screen_orientation_delegate_.get());
 612   }
 613 #endif
 614
 615 #if defined(OS_MACOSX) && !defined(OS_IOS)
 616   {
 617     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:IOSurfaceManager");
 618     if (parsed_command_line_.HasSwitch(switches::kSingleProcess)) {
 619       IOSurfaceManager::SetInstance(InProcessIOSurfaceManager::GetInstance());
 620     } else {
 621       IOSurfaceManager::SetInstance(BrowserIOSurfaceManager::GetInstance());
 622     }
 623   }
 624
 625   if (BootstrapSandboxManager::ShouldEnable()) {
 626     TRACE_EVENT0("startup",
 627                  "BrowserMainLoop::Subsystem:BootstrapSandbox");
 628     CHECK(BootstrapSandboxManager::GetInstance());
 629   }
 630 #endif
 631
 632 #if defined(USE_OZONE)
 633   client_native_pixmap_factory_ = ui::ClientNativePixmapFactory::Create();
 634   ui::ClientNativePixmapFactory::SetInstance(
 635       client_native_pixmap_factory_.get());
 636   ui::ClientNativePixmapFactory::GetInstance()->Initialize(
 637       ui::OzonePlatform::GetInstance()->OpenClientNativePixmapDevice());
 638 #endif
 639
 640   if (parsed_command_line_.HasSwitch(switches::kMemoryMetrics)) {
 641     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:MemoryObserver");
 642     memory_observer_.reset(new MemoryObserver());
 643     base::MessageLoop::current()->AddTaskObserver(memory_observer_.get());
 644   }
 645
 646   if (parsed_command_line_.HasSwitch(
 647           switches::kEnableAggressiveDOMStorageFlushing)) {
 648     TRACE_EVENT0("startup",
 649                  "BrowserMainLoop::Subsystem:EnableAggressiveCommitDelay");
 650     DOMStorageArea::EnableAggressiveCommitDelay();
 651   }
 652
 653   // Enable memory-infra dump providers.
 654   base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(
 655       HostSharedBitmapManager::current());
 656   base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(
 657       skia::SkiaMemoryDumpProvider::GetInstance());
 658
 659 #if defined(TCMALLOC_TRACE_MEMORY_SUPPORTED)
 660   trace_memory_controller_.reset(new base::trace_event::TraceMemoryController(
 661       base::MessageLoop::current()->task_runner(),
 662       ::HeapProfilerWithPseudoStackStart, ::HeapProfilerStop,
 663       ::GetHeapProfile));
 664 #endif
 665 }
 666
 667 int BrowserMainLoop::PreCreateThreads() {
 668   if (parts_) {
 669     TRACE_EVENT0("startup",
 670         "BrowserMainLoop::CreateThreads:PreCreateThreads");
 671     TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::PreCreateThreads");
 672
 673     result_code_ = parts_->PreCreateThreads();
 674   }
 675
 676   // TODO(chrisha): Abstract away this construction mess to a helper function,
 677   // once MemoryPressureMonitor is made a concrete class.
 678 #if defined(OS_CHROMEOS)
 679   if (chromeos::switches::MemoryPressureHandlingEnabled()) {
 680     memory_pressure_monitor_.reset(new base::chromeos::MemoryPressureMonitor(
 681         chromeos::switches::GetMemoryPressureThresholds()));
 682   }
 683 #elif defined(OS_MACOSX) && !defined(OS_IOS)
 684   memory_pressure_monitor_.reset(new base::mac::MemoryPressureMonitor());
 685 #elif defined(OS_WIN)
 686   memory_pressure_monitor_.reset(CreateWinMemoryPressureMonitor(
 687       parsed_command_line_));
 688 #endif
 689
 690 #if defined(ENABLE_PLUGINS)
 691   // Prior to any processing happening on the io thread, we create the
 692   // plugin service as it is predominantly used from the io thread,
 693   // but must be created on the main thread. The service ctor is
 694   // inexpensive and does not invoke the io_thread() accessor.
 695   {
 696     TRACE_EVENT0("startup", "BrowserMainLoop::CreateThreads:PluginService");
 697     PluginService::GetInstance()->Init();
 698   }
 699 #endif
 700
 701 #if defined(OS_MACOSX)
 702   {
 703     // Initialize AVFoundation if supported, for audio and video.
 704     TRACE_EVENT0("startup",
 705                  "BrowserMainLoop::CreateThreads:InitializeAVFoundation");
 706     AVFoundationGlue::InitializeAVFoundation();
 707   }
 708 #endif
 709
 710   // 1) Need to initialize in-process GpuDataManager before creating threads.
 711   // It's unsafe to append the gpu command line switches to the global
 712   // CommandLine::ForCurrentProcess object after threads are created.
 713   // 2) Must be after parts_->PreCreateThreads to pick up chrome://flags.
 714   GpuDataManagerImpl::GetInstance()->Initialize();
 715
 716 #if !defined(OS_IOS) && (!defined(GOOGLE_CHROME_BUILD) || defined(OS_ANDROID))
 717   // Single-process is an unsupported and not fully tested mode, so
 718   // don't enable it for official Chrome builds (except on Android).
 719   if (parsed_command_line_.HasSwitch(switches::kSingleProcess))
 720     RenderProcessHost::SetRunRendererInProcess(true);
 721 #endif
 722
 723   return result_code_;
 724 }
 725
 726 void BrowserMainLoop::CreateStartupTasks() {
 727   TRACE_EVENT0("startup", "BrowserMainLoop::CreateStartupTasks");
 728   TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::CreateStartupTasks");
 729
 730   // First time through, we really want to create all the tasks
 731   if (!startup_task_runner_.get()) {
 732 #if defined(OS_ANDROID)
 733     startup_task_runner_ = make_scoped_ptr(
 734         new StartupTaskRunner(base::Bind(&BrowserStartupComplete),
 735                               base::ThreadTaskRunnerHandle::Get()));
 736 #else
 737     startup_task_runner_ = make_scoped_ptr(
 738         new StartupTaskRunner(base::Callback<void(int)>(),
 739                               base::ThreadTaskRunnerHandle::Get()));
 740 #endif
 741     StartupTask pre_create_threads =
 742         base::Bind(&BrowserMainLoop::PreCreateThreads, base::Unretained(this));
 743     startup_task_runner_->AddTask(pre_create_threads);
 744
 745     StartupTask create_threads =
 746         base::Bind(&BrowserMainLoop::CreateThreads, base::Unretained(this));
 747     startup_task_runner_->AddTask(create_threads);
 748
 749     StartupTask browser_thread_started = base::Bind(
 750         &BrowserMainLoop::BrowserThreadsStarted, base::Unretained(this));
 751     startup_task_runner_->AddTask(browser_thread_started);
 752
 753     StartupTask pre_main_message_loop_run = base::Bind(
 754         &BrowserMainLoop::PreMainMessageLoopRun, base::Unretained(this));
 755     startup_task_runner_->AddTask(pre_main_message_loop_run);
 756
 757 #if defined(OS_ANDROID)
 758     if (BrowserMayStartAsynchronously()) {
 759       startup_task_runner_->StartRunningTasksAsync();
 760     }
 761 #endif
 762   }
 763 #if defined(OS_ANDROID)
 764   if (!BrowserMayStartAsynchronously()) {
 765     // A second request for asynchronous startup can be ignored, so
 766     // StartupRunningTasksAsync is only called first time through. If, however,
 767     // this is a request for synchronous startup then it must override any
 768     // previous call for async startup, so we call RunAllTasksNow()
 769     // unconditionally.
 770     startup_task_runner_->RunAllTasksNow();
 771   }
 772 #else
 773   startup_task_runner_->RunAllTasksNow();
 774 #endif
 775 }
 776
 777 int BrowserMainLoop::CreateThreads() {
 778   TRACE_EVENT0("startup", "BrowserMainLoop::CreateThreads");
 779   TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::CreateThreads");
 780
 781   base::Thread::Options io_message_loop_options;
 782   io_message_loop_options.message_loop_type = base::MessageLoop::TYPE_IO;
 783   base::Thread::Options ui_message_loop_options;
 784   ui_message_loop_options.message_loop_type = base::MessageLoop::TYPE_UI;
 785
 786   // Start threads in the order they occur in the BrowserThread::ID
 787   // enumeration, except for BrowserThread::UI which is the main
 788   // thread.
 789   //
 790   // Must be size_t so we can increment it.
 791   for (size_t thread_id = BrowserThread::UI + 1;
 792        thread_id < BrowserThread::ID_COUNT;
 793        ++thread_id) {
 794     scoped_ptr<BrowserProcessSubThread>* thread_to_start = NULL;
 795     base::Thread::Options options;
 796
 797     switch (thread_id) {
 798       case BrowserThread::DB:
 799         TRACE_EVENT_BEGIN1("startup",
 800             "BrowserMainLoop::CreateThreads:start",
 801             "Thread", "BrowserThread::DB");
 802         thread_to_start = &db_thread_;
 803         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 804         break;
 805       case BrowserThread::FILE_USER_BLOCKING:
 806         TRACE_EVENT_BEGIN1("startup",
 807             "BrowserMainLoop::CreateThreads:start",
 808             "Thread", "BrowserThread::FILE_USER_BLOCKING");
 809         thread_to_start = &file_user_blocking_thread_;
 810         break;
 811       case BrowserThread::FILE:
 812         TRACE_EVENT_BEGIN1("startup",
 813             "BrowserMainLoop::CreateThreads:start",
 814             "Thread", "BrowserThread::FILE");
 815         thread_to_start = &file_thread_;
 816 #if defined(OS_WIN)
 817         // On Windows, the FILE thread needs to be have a UI message loop
 818         // which pumps messages in such a way that Google Update can
 819         // communicate back to us.
 820         options = ui_message_loop_options;
 821 #else
 822         options = io_message_loop_options;
 823 #endif
 824         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 825         break;
 826       case BrowserThread::PROCESS_LAUNCHER:
 827         TRACE_EVENT_BEGIN1("startup",
 828             "BrowserMainLoop::CreateThreads:start",
 829             "Thread", "BrowserThread::PROCESS_LAUNCHER");
 830         thread_to_start = &process_launcher_thread_;
 831         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 832         break;
 833       case BrowserThread::CACHE:
 834         TRACE_EVENT_BEGIN1("startup",
 835             "BrowserMainLoop::CreateThreads:start",
 836             "Thread", "BrowserThread::CACHE");
 837         thread_to_start = &cache_thread_;
 838         options = io_message_loop_options;
 839         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 840         break;
 841       case BrowserThread::IO:
 842         TRACE_EVENT_BEGIN1("startup",
 843             "BrowserMainLoop::CreateThreads:start",
 844             "Thread", "BrowserThread::IO");
 845         thread_to_start = &io_thread_;
 846         options = io_message_loop_options;
 847 #if defined(OS_ANDROID)
 848         // Up the priority of the |io_thread_| as some of its IPCs relate to
 849         // display tasks.
 850         options.priority = base::ThreadPriority::DISPLAY;
 851 #endif
 852         break;
 853       case BrowserThread::UI:
 854       case BrowserThread::ID_COUNT:
 855       default:
 856         NOTREACHED();
 857         break;
 858     }
 859
 860     BrowserThread::ID id = static_cast<BrowserThread::ID>(thread_id);
 861
 862     if (thread_to_start) {
 863       (*thread_to_start).reset(new BrowserProcessSubThread(id));
 864       if (!(*thread_to_start)->StartWithOptions(options)) {
 865         LOG(FATAL) << "Failed to start the browser thread: id == " << id;
 866       }
 867     } else {
 868       NOTREACHED();
 869     }
 870
 871     TRACE_EVENT_END0("startup", "BrowserMainLoop::CreateThreads:start");
 872   }
 873   created_threads_ = true;
 874   return result_code_;
 875 }
 876
 877 int BrowserMainLoop::PreMainMessageLoopRun() {
 878   if (parts_) {
 879     TRACE_EVENT0("startup",
 880         "BrowserMainLoop::CreateThreads:PreMainMessageLoopRun");
 881     TRACK_SCOPED_REGION(
 882         "Startup", "BrowserMainLoop::PreMainMessageLoopRun");
 883
 884     parts_->PreMainMessageLoopRun();
 885   }
 886
 887   // If the UI thread blocks, the whole UI is unresponsive.
 888   // Do not allow disk IO from the UI thread.
 889   base::ThreadRestrictions::SetIOAllowed(false);
 890   base::ThreadRestrictions::DisallowWaiting();
 891   return result_code_;
 892 }
 893
 894 void BrowserMainLoop::RunMainMessageLoopParts() {
 895   TRACE_EVENT_BEGIN_ETW("BrowserMain:MESSAGE_LOOP", 0, "");
 896
 897   bool ran_main_loop = false;
 898   if (parts_)
 899     ran_main_loop = parts_->MainMessageLoopRun(&result_code_);
 900
 901   if (!ran_main_loop)
 902     MainMessageLoopRun();
 903
 904   TRACE_EVENT_END_ETW("BrowserMain:MESSAGE_LOOP", 0, "");
 905 }
 906
 907 void BrowserMainLoop::ShutdownThreadsAndCleanUp() {
 908   if (!created_threads_) {
 909     // Called early, nothing to do
 910     return;
 911   }
 912   TRACE_EVENT0("shutdown", "BrowserMainLoop::ShutdownThreadsAndCleanUp");
 913
 914   // Teardown may start in PostMainMessageLoopRun, and during teardown we
 915   // need to be able to perform IO.
 916   base::ThreadRestrictions::SetIOAllowed(true);
 917   BrowserThread::PostTask(
 918       BrowserThread::IO, FROM_HERE,
 919       base::Bind(base::IgnoreResult(&base::ThreadRestrictions::SetIOAllowed),
 920                  true));
 921
 922   mojo_shell_context_.reset();
 923
 924 #if !defined(OS_IOS)
 925   if (RenderProcessHost::run_renderer_in_process())
 926     RenderProcessHostImpl::ShutDownInProcessRenderer();
 927 #endif
 928
 929   if (parts_) {
 930     TRACE_EVENT0("shutdown",
 931                  "BrowserMainLoop::Subsystem:PostMainMessageLoopRun");
 932     parts_->PostMainMessageLoopRun();
 933   }
 934
 935 #if defined(USE_AURA)
 936   aura::Env::DeleteInstance();
 937 #endif
 938
 939   trace_memory_controller_.reset();
 940   system_stats_monitor_.reset();
 941
 942 #if !defined(OS_IOS)
 943   // Destroying the GpuProcessHostUIShims on the UI thread posts a task to
 944   // delete related objects on the GPU thread. This must be done before
 945   // stopping the GPU thread. The GPU thread will close IPC channels to renderer
 946   // processes so this has to happen before stopping the IO thread.
 947   {
 948     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:GPUProcessHostShim");
 949     GpuProcessHostUIShim::DestroyAll();
 950   }
 951   // Cancel pending requests and prevent new requests.
 952   if (resource_dispatcher_host_) {
 953     TRACE_EVENT0("shutdown",
 954                  "BrowserMainLoop::Subsystem:ResourceDispatcherHost");
 955     resource_dispatcher_host_.get()->Shutdown();
 956   }
 957
 958   memory_pressure_monitor_.reset();
 959
 960 #if defined(OS_MACOSX)
 961   BrowserCompositorMac::DisableRecyclingForShutdown();
 962 #endif
 963
 964 #if defined(USE_AURA) || defined(OS_MACOSX)
 965   {
 966     TRACE_EVENT0("shutdown",
 967                  "BrowserMainLoop::Subsystem:ImageTransportFactory");
 968     ImageTransportFactory::Terminate();
 969   }
 970 #endif
 971
 972 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 973   ZygoteHostImpl::GetInstance()->TearDownAfterLastChild();
 974 #endif  // defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 975
 976   // The device monitors are using |system_monitor_| as dependency, so delete
 977   // them before |system_monitor_| goes away.
 978   // On Mac and windows, the monitor needs to be destroyed on the same thread
 979   // as they were created. On Linux, the monitor will be deleted when IO thread
 980   // goes away.
 981 #if defined(OS_WIN)
 982   system_message_window_.reset();
 983 #elif defined(OS_MACOSX)
 984   device_monitor_mac_.reset();
 985 #endif
 986 #endif  // !defined(OS_IOS)
 987
 988   // Must be size_t so we can subtract from it.
 989   for (size_t thread_id = BrowserThread::ID_COUNT - 1;
 990        thread_id >= (BrowserThread::UI + 1);
 991        --thread_id) {
 992     // Find the thread object we want to stop. Looping over all valid
 993     // BrowserThread IDs and DCHECKing on a missing case in the switch
 994     // statement helps avoid a mismatch between this code and the
 995     // BrowserThread::ID enumeration.
 996     //
 997     // The destruction order is the reverse order of occurrence in the
 998     // BrowserThread::ID list. The rationale for the order is as
 999     // follows (need to be filled in a bit):
1000     //
1001     //
1002     // - The IO thread is the only user of the CACHE thread.
1003     //
1004     // - The PROCESS_LAUNCHER thread must be stopped after IO in case
1005     //   the IO thread posted a task to terminate a process on the
1006     //   process launcher thread.
1007     //
1008     // - (Not sure why DB stops last.)
1009     switch (thread_id) {
1010       case BrowserThread::DB: {
1011         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:DBThread");
1012         ResetThread_DB(db_thread_.Pass());
1013         break;
1014       }
1015       case BrowserThread::FILE: {
1016         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:FileThread");
1017 #if !defined(OS_IOS)
1018         // Clean up state that lives on or uses the file_thread_ before
1019         // it goes away.
1020         if (resource_dispatcher_host_)
1021           resource_dispatcher_host_.get()->save_file_manager()->Shutdown();
1022 #endif  // !defined(OS_IOS)
1023         ResetThread_FILE(file_thread_.Pass());
1024         break;
1025       }
1026       case BrowserThread::FILE_USER_BLOCKING: {
1027         TRACE_EVENT0("shutdown",
1028                       "BrowserMainLoop::Subsystem:FileUserBlockingThread");
1029         ResetThread_FILE_USER_BLOCKING(file_user_blocking_thread_.Pass());
1030         break;
1031       }
1032       case BrowserThread::PROCESS_LAUNCHER: {
1033         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:LauncherThread");
1034         ResetThread_PROCESS_LAUNCHER(process_launcher_thread_.Pass());
1035         break;
1036       }
1037       case BrowserThread::CACHE: {
1038         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:CacheThread");
1039         ResetThread_CACHE(cache_thread_.Pass());
1040         break;
1041       }
1042       case BrowserThread::IO: {
1043         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:IOThread");
1044         ResetThread_IO(io_thread_.Pass());
1045         break;
1046       }
1047       case BrowserThread::UI:
1048       case BrowserThread::ID_COUNT:
1049       default:
1050         NOTREACHED();
1051         break;
1052     }
1053   }
1054
1055 #if !defined(OS_IOS)
1056   {
1057     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:IndexedDBThread");
1058     ResetThread_IndexedDb(indexed_db_thread_.Pass());
1059   }
1060 #endif
1061
1062   // Close the blocking I/O pool after the other threads. Other threads such
1063   // as the I/O thread may need to schedule work like closing files or flushing
1064   // data during shutdown, so the blocking pool needs to be available. There
1065   // may also be slow operations pending that will blcok shutdown, so closing
1066   // it here (which will block until required operations are complete) gives
1067   // more head start for those operations to finish.
1068   {
1069     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:ThreadPool");
1070     BrowserThreadImpl::ShutdownThreadPool();
1071   }
1072
1073 #if !defined(OS_IOS)
1074   // Must happen after the IO thread is shutdown since this may be accessed from
1075   // it.
1076   {
1077     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:GPUChannelFactory");
1078     if (BrowserGpuChannelHostFactory::instance())
1079       BrowserGpuChannelHostFactory::Terminate();
1080   }
1081
1082   // Must happen after the I/O thread is shutdown since this class lives on the
1083   // I/O thread and isn't threadsafe.
1084   {
1085     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:GamepadService");
1086     GamepadService::GetInstance()->Terminate();
1087   }
1088   {
1089     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:SensorService");
1090     DeviceInertialSensorService::GetInstance()->Shutdown();
1091   }
1092 #if !defined(OS_ANDROID)
1093   {
1094     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:BatteryStatusService");
1095     device::BatteryStatusService::GetInstance()->Shutdown();
1096   }
1097 #endif
1098   {
1099     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:DeleteDataSources");
1100     URLDataManager::DeleteDataSources();
1101   }
1102 #endif  // !defined(OS_IOS)
1103
1104   if (parts_) {
1105     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:PostDestroyThreads");
1106     parts_->PostDestroyThreads();
1107   }
1108 }
1109
1110 void BrowserMainLoop::StopStartupTracingTimer() {
1111   startup_trace_timer_.Stop();
1112 }
1113
1114 void BrowserMainLoop::InitializeMainThread() {
1115   TRACE_EVENT0("startup", "BrowserMainLoop::InitializeMainThread");
1116   static const char kThreadName[] = "CrBrowserMain";
1117   base::PlatformThread::SetName(kThreadName);
1118   if (main_message_loop_)
1119     main_message_loop_->set_thread_name(kThreadName);
1120
1121   // Register the main thread by instantiating it, but don't call any methods.
1122   main_thread_.reset(
1123       new BrowserThreadImpl(BrowserThread::UI, base::MessageLoop::current()));
1124 }
1125
1126 int BrowserMainLoop::BrowserThreadsStarted() {
1127   TRACE_EVENT0("startup", "BrowserMainLoop::BrowserThreadsStarted");
1128
1129 #if !defined(OS_IOS)
1130   indexed_db_thread_.reset(new base::Thread("IndexedDB"));
1131   indexed_db_thread_->Start();
1132 #endif
1133
1134 #if !defined(OS_IOS)
1135   HistogramSynchronizer::GetInstance();
1136
1137 #if defined(OS_ANDROID)
1138   // Up the priority of the UI thread.
1139   base::PlatformThread::SetCurrentThreadPriority(base::ThreadPriority::DISPLAY);
1140 #endif
1141
1142   bool always_uses_gpu = true;
1143   bool established_gpu_channel = false;
1144 #if defined(OS_ANDROID)
1145   // TODO(crbug.com/439322): This should be set to |true|.
1146   established_gpu_channel = false;
1147   BrowserGpuChannelHostFactory::Initialize(established_gpu_channel);
1148 #elif defined(USE_AURA) || defined(OS_MACOSX)
1149   established_gpu_channel = true;
1150   if (!GpuDataManagerImpl::GetInstance()->CanUseGpuBrowserCompositor() ||
1151       parsed_command_line_.HasSwitch(switches::kDisableGpuEarlyInit)) {
1152     established_gpu_channel = always_uses_gpu = false;
1153   }
1154   BrowserGpuChannelHostFactory::Initialize(established_gpu_channel);
1155   ImageTransportFactory::Initialize();
1156 #if defined(USE_AURA)
1157   if (aura::Env::GetInstance()) {
1158     aura::Env::GetInstance()->set_context_factory(GetContextFactory());
1159   }
1160 #endif  // defined(USE_AURA)
1161 #endif  // defined(OS_ANDROID)
1162
1163   // Enable the GpuMemoryBuffer dump provider with IO thread affinity. Note that
1164   // unregistration happens on the IO thread (See
1165   // BrowserProcessSubThread::IOThreadPreCleanUp).
1166   base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(
1167       BrowserGpuMemoryBufferManager::current(), io_thread_->task_runner());
1168
1169   {
1170     TRACE_EVENT0("startup", "BrowserThreadsStarted::Subsystem:AudioMan");
1171     audio_manager_.reset(media::AudioManager::CreateWithHangTimer(
1172         MediaInternals::GetInstance(), io_thread_->task_runner()));
1173   }
1174
1175   {
1176     TRACE_EVENT0("startup", "BrowserThreadsStarted::Subsystem:MidiManager");
1177     midi_manager_.reset(media::midi::MidiManager::Create());
1178   }
1179
1180 #if defined(OS_LINUX) && defined(USE_UDEV)
1181   device_monitor_linux_.reset(new DeviceMonitorLinux());
1182 #elif defined(OS_MACOSX)
1183   device_monitor_mac_.reset(new DeviceMonitorMac());
1184 #endif
1185
1186 #if defined(OS_WIN)
1187   UMA_HISTOGRAM_BOOLEAN("Windows.Win32kRendererLockdown",
1188                         IsWin32kRendererLockdownEnabled());
1189 #endif
1190   // RDH needs the IO thread to be created
1191   {
1192     TRACE_EVENT0("startup",
1193       "BrowserMainLoop::BrowserThreadsStarted:InitResourceDispatcherHost");
1194     resource_dispatcher_host_.reset(new ResourceDispatcherHostImpl());
1195   }
1196
1197   // MediaStreamManager needs the IO thread to be created.
1198   {
1199     TRACE_EVENT0("startup",
1200       "BrowserMainLoop::BrowserThreadsStarted:InitMediaStreamManager");
1201     media_stream_manager_.reset(new MediaStreamManager(audio_manager_.get()));
1202   }
1203
1204   {
1205     TRACE_EVENT0("startup",
1206       "BrowserMainLoop::BrowserThreadsStarted:InitSpeechRecognition");
1207     speech_recognition_manager_.reset(new SpeechRecognitionManagerImpl(
1208         audio_manager_.get(), media_stream_manager_.get()));
1209   }
1210
1211   {
1212     TRACE_EVENT0(
1213         "startup",
1214         "BrowserMainLoop::BrowserThreadsStarted::InitUserInputMonitor");
1215     user_input_monitor_ = media::UserInputMonitor::Create(
1216         io_thread_->task_runner(), main_thread_->task_runner());
1217   }
1218
1219   {
1220     TRACE_EVENT0("startup",
1221                  "BrowserMainLoop::BrowserThreadsStarted::TimeZoneMonitor");
1222     time_zone_monitor_ = TimeZoneMonitor::Create();
1223   }
1224
1225   // Alert the clipboard class to which threads are allowed to access the
1226   // clipboard:
1227   std::vector<base::PlatformThreadId> allowed_clipboard_threads;
1228   // The current thread is the UI thread.
1229   allowed_clipboard_threads.push_back(base::PlatformThread::CurrentId());
1230 #if defined(OS_WIN)
1231   // On Windows, clipboards are also used on the FILE or IO threads.
1232   allowed_clipboard_threads.push_back(file_thread_->GetThreadId());
1233   allowed_clipboard_threads.push_back(io_thread_->GetThreadId());
1234 #endif
1235   ui::Clipboard::SetAllowedThreads(allowed_clipboard_threads);
1236
1237   // When running the GPU thread in-process, avoid optimistically starting it
1238   // since creating the GPU thread races against creation of the one-and-only
1239   // ChildProcess instance which is created by the renderer thread.
1240   if (GpuDataManagerImpl::GetInstance()->GpuAccessAllowed(NULL) &&
1241       !established_gpu_channel &&
1242       always_uses_gpu &&
1243       !UsingInProcessGpu()) {
1244     TRACE_EVENT_INSTANT0("gpu", "Post task to launch GPU process",
1245                          TRACE_EVENT_SCOPE_THREAD);
1246     BrowserThread::PostTask(
1247         BrowserThread::IO, FROM_HERE,
1248         base::Bind(base::IgnoreResult(&GpuProcessHost::Get),
1249                    GpuProcessHost::GPU_PROCESS_KIND_SANDBOXED,
1250                    CAUSE_FOR_GPU_LAUNCH_BROWSER_STARTUP));
1251   }
1252
1253 #if defined(OS_MACOSX)
1254   ThemeHelperMac::GetInstance();
1255   SystemHotkeyHelperMac::GetInstance()->DeferredLoadSystemHotkeys();
1256 #endif  // defined(OS_MACOSX)
1257
1258 #endif  // !defined(OS_IOS)
1259
1260   mojo_shell_context_.reset(new MojoShellContext);
1261
1262   return result_code_;
1263 }
1264
1265 bool BrowserMainLoop::UsingInProcessGpu() const {
1266   return parsed_command_line_.HasSwitch(switches::kSingleProcess) ||
1267          parsed_command_line_.HasSwitch(switches::kInProcessGPU);
1268 }
1269
1270 bool BrowserMainLoop::InitializeToolkit() {
1271   TRACE_EVENT0("startup", "BrowserMainLoop::InitializeToolkit");
1272   TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::InitializeToolkit");
1273
1274   // TODO(evan): this function is rather subtle, due to the variety
1275   // of intersecting ifdefs we have.  To keep it easy to follow, there
1276   // are no #else branches on any #ifs.
1277   // TODO(stevenjb): Move platform specific code into platform specific Parts
1278   // (Need to add InitializeToolkit stage to BrowserParts).
1279   // See also GTK setup in EarlyInitialization, above, and associated comments.
1280
1281 #if defined(OS_WIN)
1282   // Init common control sex.
1283   INITCOMMONCONTROLSEX config;
1284   config.dwSize = sizeof(config);
1285   config.dwICC = ICC_WIN95_CLASSES;
1286   if (!InitCommonControlsEx(&config))
1287     PLOG(FATAL);
1288 #endif
1289
1290 #if defined(USE_AURA)
1291
1292 #if defined(USE_X11)
1293   if (!gfx::GetXDisplay())
1294     return false;
1295 #endif
1296
1297   // Env creates the compositor. Aura widgets need the compositor to be created
1298   // before they can be initialized by the browser.
1299   aura::Env::CreateInstance(true);
1300 #endif  // defined(USE_AURA)
1301
1302   if (parts_)
1303     parts_->ToolkitInitialized();
1304
1305   return true;
1306 }
1307
1308 void BrowserMainLoop::MainMessageLoopRun() {
1309 #if defined(OS_ANDROID)
1310   // Android's main message loop is the Java message loop.
1311   NOTREACHED();
1312 #else
1313   DCHECK(base::MessageLoopForUI::IsCurrent());
1314   if (parameters_.ui_task) {
1315     base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE,
1316                                                   *parameters_.ui_task);
1317   }
1318
1319   base::RunLoop run_loop;
1320   run_loop.Run();
1321 #endif
1322 }
1323
1324 base::FilePath BrowserMainLoop::GetStartupTraceFileName(
1325     const base::CommandLine& command_line) const {
1326   base::FilePath trace_file;
1327   if (command_line.HasSwitch(switches::kTraceStartup)) {
1328     trace_file = command_line.GetSwitchValuePath(
1329         switches::kTraceStartupFile);
1330     // trace_file = "none" means that startup events will show up for the next
1331     // begin/end tracing (via about:tracing or AutomationProxy::BeginTracing/
1332     // EndTracing, for example).
1333     if (trace_file == base::FilePath().AppendASCII("none"))
1334       return trace_file;
1335
1336     if (trace_file.empty()) {
1337 #if defined(OS_ANDROID)
1338       TracingControllerAndroid::GenerateTracingFilePath(&trace_file);
1339 #else
1340       // Default to saving the startup trace into the current dir.
1341       trace_file = base::FilePath().AppendASCII("chrometrace.log");
1342 #endif
1343     }
1344   } else {
1345 #if defined(OS_ANDROID)
1346     TracingControllerAndroid::GenerateTracingFilePath(&trace_file);
1347 #else
1348     trace_file = tracing::TraceConfigFile::GetInstance()->GetResultFile();
1349 #endif
1350   }
1351
1352   return trace_file;
1353 }
1354
1355 void BrowserMainLoop::InitStartupTracingForDuration(
1356     const base::CommandLine& command_line) {
1357   DCHECK(is_tracing_startup_for_duration_);
1358
1359   // Initialize the tracing controller, required for memory tracing.
1360   TracingController::GetInstance();
1361
1362   startup_trace_file_ = GetStartupTraceFileName(parsed_command_line_);
1363
1364   int delay_secs = 5;
1365   if (command_line.HasSwitch(switches::kTraceStartup)) {
1366     std::string delay_str = command_line.GetSwitchValueASCII(
1367         switches::kTraceStartupDuration);
1368     if (!delay_str.empty() && !base::StringToInt(delay_str, &delay_secs)) {
1369       DLOG(WARNING) << "Could not parse --" << switches::kTraceStartupDuration
1370           << "=" << delay_str << " defaulting to 5 (secs)";
1371       delay_secs = 5;
1372     }
1373   } else {
1374     delay_secs = tracing::TraceConfigFile::GetInstance()->GetStartupDuration();
1375   }
1376
1377   startup_trace_timer_.Start(FROM_HERE,
1378                              base::TimeDelta::FromSeconds(delay_secs),
1379                              this,
1380                              &BrowserMainLoop::EndStartupTracing);
1381 }
1382
1383 void BrowserMainLoop::EndStartupTracing() {
1384   DCHECK(is_tracing_startup_for_duration_);
1385
1386   is_tracing_startup_for_duration_ = false;
1387   TracingController::GetInstance()->DisableRecording(
1388       TracingController::CreateFileSink(
1389           startup_trace_file_,
1390           base::Bind(OnStoppedStartupTracing, startup_trace_file_)));
1391 }
1392
1393 }  // namespace content