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