content/browser/browser_main_loop.cc

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