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 "ui/base/clipboard/clipboard.h"
  71
  72 #if defined(USE_AURA) || (defined(OS_MACOSX) && !defined(OS_IOS))
  73 #include "content/browser/compositor/image_transport_factory.h"
  74 #endif
  75
  76 #if defined(USE_AURA)
  77 #include "content/public/browser/context_factory.h"
  78 #include "ui/aura/env.h"
  79 #endif
  80
  81 #if !defined(OS_IOS)
  82 #include "content/browser/renderer_host/render_process_host_impl.h"
  83 #endif
  84
  85 #if defined(OS_ANDROID)
  86 #include "base/android/jni_android.h"
  87 #include "content/browser/android/browser_startup_controller.h"
  88 #include "content/browser/android/browser_surface_texture_manager.h"
  89 #include "content/browser/android/in_process_surface_texture_manager.h"
  90 #include "content/browser/android/tracing_controller_android.h"
  91 #include "content/browser/screen_orientation/screen_orientation_delegate_android.h"
  92 #include "content/public/browser/screen_orientation_provider.h"
  93 #include "ui/gl/gl_surface.h"
  94 #endif
  95
  96 #if defined(OS_MACOSX)
  97 #include "media/base/mac/avfoundation_glue.h"
  98 #endif
  99
 100 #if defined(OS_MACOSX) && !defined(OS_IOS)
 101 #include "base/memory/memory_pressure_monitor_mac.h"
 102 #include "content/browser/bootstrap_sandbox_mac.h"
 103 #include "content/browser/browser_io_surface_manager_mac.h"
 104 #include "content/browser/cocoa/system_hotkey_helper_mac.h"
 105 #include "content/browser/compositor/browser_compositor_view_mac.h"
 106 #include "content/browser/in_process_io_surface_manager_mac.h"
 107 #include "content/browser/theme_helper_mac.h"
 108 #endif
 109
 110 #if defined(OS_WIN)
 111 #include <windows.h>
 112 #include <commctrl.h>
 113 #include <shellapi.h>
 114
 115 #include "base/memory/memory_pressure_monitor_win.h"
 116 #include "content/browser/system_message_window_win.h"
 117 #include "content/common/sandbox_win.h"
 118 #include "net/base/winsock_init.h"
 119 #include "ui/base/l10n/l10n_util_win.h"
 120 #endif
 121
 122 #if defined(OS_CHROMEOS)
 123 #include "base/memory/memory_pressure_monitor_chromeos.h"
 124 #include "chromeos/chromeos_switches.h"
 125 #endif
 126
 127 #if defined(USE_GLIB)
 128 #include <glib-object.h>
 129 #endif
 130
 131 #if defined(OS_LINUX) && defined(USE_UDEV)
 132 #include "content/browser/device_monitor_udev.h"
 133 #elif defined(OS_MACOSX) && !defined(OS_IOS)
 134 #include "content/browser/device_monitor_mac.h"
 135 #endif
 136
 137 #if defined(OS_POSIX) && !defined(OS_MACOSX)
 138 #include "content/browser/renderer_host/render_sandbox_host_linux.h"
 139 #include "content/browser/zygote_host/zygote_host_impl_linux.h"
 140 #include "sandbox/linux/suid/client/setuid_sandbox_host.h"
 141 #endif
 142
 143 #if defined(ENABLE_PLUGINS)
 144 #include "content/browser/plugin_service_impl.h"
 145 #endif
 146
 147 #if defined(TCMALLOC_TRACE_MEMORY_SUPPORTED)
 148 #include "third_party/tcmalloc/chromium/src/gperftools/heap-profiler.h"
 149 #endif
 150
 151 #if defined(USE_X11)
 152 #include "ui/gfx/x/x11_connection.h"
 153 #include "ui/gfx/x/x11_types.h"
 154 #endif
 155
 156 // One of the linux specific headers defines this as a macro.
 157 #ifdef DestroyAll
 158 #undef DestroyAll
 159 #endif
 160
 161 namespace content {
 162 namespace {
 163
 164 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 165 void SetupSandbox(const base::CommandLine& parsed_command_line) {
 166   TRACE_EVENT0("startup", "SetupSandbox");
 167   base::FilePath sandbox_binary;
 168
 169   scoped_ptr<sandbox::SetuidSandboxHost> setuid_sandbox_host(
 170       sandbox::SetuidSandboxHost::Create());
 171
 172   const bool want_setuid_sandbox =
 173       !parsed_command_line.HasSwitch(switches::kNoSandbox) &&
 174       !parsed_command_line.HasSwitch(switches::kDisableSetuidSandbox) &&
 175       !setuid_sandbox_host->IsDisabledViaEnvironment();
 176
 177   static const char no_suid_error[] =
 178       "Running without the SUID sandbox! See "
 179       "https://code.google.com/p/chromium/wiki/LinuxSUIDSandboxDevelopment "
 180       "for more information on developing with the sandbox on.";
 181   if (want_setuid_sandbox) {
 182     sandbox_binary = setuid_sandbox_host->GetSandboxBinaryPath();
 183     if (sandbox_binary.empty()) {
 184       // This needs to be fatal. Talk to security@chromium.org if you feel
 185       // otherwise.
 186       LOG(FATAL) << no_suid_error;
 187     }
 188   } else {
 189     LOG(ERROR) << no_suid_error;
 190   }
 191
 192   // Tickle the sandbox host and zygote host so they fork now.
 193   RenderSandboxHostLinux::GetInstance()->Init();
 194   ZygoteHostImpl::GetInstance()->Init(sandbox_binary.value());
 195 }
 196 #endif
 197
 198 #if defined(USE_GLIB)
 199 static void GLibLogHandler(const gchar* log_domain,
 200                            GLogLevelFlags log_level,
 201                            const gchar* message,
 202                            gpointer userdata) {
 203   if (!log_domain)
 204     log_domain = "<unknown>";
 205   if (!message)
 206     message = "<no message>";
 207
 208   if (strstr(message, "Unable to retrieve the file info for")) {
 209     LOG(ERROR) << "GTK File code error: " << message;
 210   } else if (strstr(message, "Could not find the icon") &&
 211              strstr(log_domain, "Gtk")) {
 212     LOG(ERROR) << "GTK icon error: " << message;
 213   } else if (strstr(message, "Theme file for default has no") ||
 214              strstr(message, "Theme directory") ||
 215              strstr(message, "theme pixmap") ||
 216              strstr(message, "locate theme engine")) {
 217     LOG(ERROR) << "GTK theme error: " << message;
 218   } else if (strstr(message, "Unable to create Ubuntu Menu Proxy") &&
 219              strstr(log_domain, "<unknown>")) {
 220     LOG(ERROR) << "GTK menu proxy create failed";
 221   } else if (strstr(message, "Out of memory") &&
 222              strstr(log_domain, "<unknown>")) {
 223     LOG(ERROR) << "DBus call timeout or out of memory: "
 224                << "http://crosbug.com/15496";
 225   } else if (strstr(message, "Could not connect: Connection refused") &&
 226              strstr(log_domain, "<unknown>")) {
 227     LOG(ERROR) << "DConf settings backend could not connect to session bus: "
 228                << "http://crbug.com/179797";
 229   } else if (strstr(message, "Attempting to store changes into") ||
 230              strstr(message, "Attempting to set the permissions of")) {
 231     LOG(ERROR) << message << " (http://bugs.chromium.org/161366)";
 232   } else if (strstr(message, "drawable is not a native X11 window")) {
 233     LOG(ERROR) << message << " (http://bugs.chromium.org/329991)";
 234   } else if (strstr(message, "Cannot do system-bus activation with no user")) {
 235     LOG(ERROR) << message << " (http://crbug.com/431005)";
 236   } else {
 237     LOG(DFATAL) << log_domain << ": " << message;
 238   }
 239 }
 240
 241 static void SetUpGLibLogHandler() {
 242   // Register GLib-handled assertions to go through our logging system.
 243   const char* kLogDomains[] = { NULL, "Gtk", "Gdk", "GLib", "GLib-GObject" };
 244   for (size_t i = 0; i < arraysize(kLogDomains); i++) {
 245     g_log_set_handler(kLogDomains[i],
 246                       static_cast<GLogLevelFlags>(G_LOG_FLAG_RECURSION |
 247                                                   G_LOG_FLAG_FATAL |
 248                                                   G_LOG_LEVEL_ERROR |
 249                                                   G_LOG_LEVEL_CRITICAL |
 250                                                   G_LOG_LEVEL_WARNING),
 251                       GLibLogHandler,
 252                       NULL);
 253   }
 254 }
 255 #endif
 256
 257 void OnStoppedStartupTracing(const base::FilePath& trace_file) {
 258   VLOG(0) << "Completed startup tracing to " << trace_file.value();
 259 }
 260
 261 // Disable optimizations for this block of functions so the compiler doesn't
 262 // merge them all together. This makes it possible to tell what thread was
 263 // unresponsive by inspecting the callstack.
 264 MSVC_DISABLE_OPTIMIZE()
 265 MSVC_PUSH_DISABLE_WARNING(4748)
 266
 267 NOINLINE void ResetThread_DB(scoped_ptr<BrowserProcessSubThread> thread) {
 268   volatile int inhibit_comdat = __LINE__;
 269   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 270   thread.reset();
 271 }
 272
 273 NOINLINE void ResetThread_FILE(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_USER_BLOCKING(
 280     scoped_ptr<BrowserProcessSubThread> thread) {
 281   volatile int inhibit_comdat = __LINE__;
 282   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 283   thread.reset();
 284 }
 285
 286 NOINLINE void ResetThread_PROCESS_LAUNCHER(
 287     scoped_ptr<BrowserProcessSubThread> thread) {
 288   volatile int inhibit_comdat = __LINE__;
 289   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 290   thread.reset();
 291 }
 292
 293 NOINLINE void ResetThread_CACHE(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_IO(scoped_ptr<BrowserProcessSubThread> thread) {
 300   volatile int inhibit_comdat = __LINE__;
 301   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 302   thread.reset();
 303 }
 304
 305 #if !defined(OS_IOS)
 306 NOINLINE void ResetThread_IndexedDb(scoped_ptr<base::Thread> thread) {
 307   volatile int inhibit_comdat = __LINE__;
 308   ALLOW_UNUSED_LOCAL(inhibit_comdat);
 309   thread.reset();
 310 }
 311 #endif
 312
 313 MSVC_POP_WARNING()
 314 MSVC_ENABLE_OPTIMIZE();
 315
 316 #if defined(OS_WIN)
 317 // Creates a memory pressure monitor using automatic thresholds, or those
 318 // specified on the command-line. Ownership is passed to the caller.
 319 base::win::MemoryPressureMonitor* CreateWinMemoryPressureMonitor(
 320     const base::CommandLine& parsed_command_line) {
 321   std::vector<std::string> thresholds;
 322   base::SplitString(
 323       parsed_command_line.GetSwitchValueASCII(
 324           switches::kMemoryPressureThresholdsMb),
 325       ',',
 326       &thresholds);
 327
 328   int moderate_threshold_mb = 0;
 329   int critical_threshold_mb = 0;
 330   if (thresholds.size() == 2 &&
 331       base::StringToInt(thresholds[0], &moderate_threshold_mb) &&
 332       base::StringToInt(thresholds[1], &critical_threshold_mb) &&
 333       moderate_threshold_mb >= critical_threshold_mb &&
 334       critical_threshold_mb >= 0) {
 335     return new base::win::MemoryPressureMonitor(moderate_threshold_mb,
 336                                                 critical_threshold_mb);
 337   }
 338
 339   // In absence of valid switches use the automatic defaults.
 340   return new base::win::MemoryPressureMonitor();
 341 }
 342 #endif  // defined(OS_WIN)
 343
 344 }  // namespace
 345
 346 // The currently-running BrowserMainLoop.  There can be one or zero.
 347 BrowserMainLoop* g_current_browser_main_loop = NULL;
 348
 349 // For measuring memory usage after each task. Behind a command line flag.
 350 class BrowserMainLoop::MemoryObserver : public base::MessageLoop::TaskObserver {
 351  public:
 352   MemoryObserver() {}
 353   ~MemoryObserver() override {}
 354
 355   void WillProcessTask(const base::PendingTask& pending_task) override {}
 356
 357   void DidProcessTask(const base::PendingTask& pending_task) override {
 358 #if !defined(OS_IOS)  // No ProcessMetrics on IOS.
 359     scoped_ptr<base::ProcessMetrics> process_metrics(
 360         base::ProcessMetrics::CreateProcessMetrics(
 361 #if defined(OS_MACOSX)
 362             base::GetCurrentProcessHandle(), NULL));
 363 #else
 364             base::GetCurrentProcessHandle()));
 365 #endif
 366     size_t private_bytes;
 367     process_metrics->GetMemoryBytes(&private_bytes, NULL);
 368     LOCAL_HISTOGRAM_MEMORY_KB("Memory.BrowserUsed", private_bytes >> 10);
 369 #endif
 370   }
 371  private:
 372   DISALLOW_COPY_AND_ASSIGN(MemoryObserver);
 373 };
 374
 375
 376 // BrowserMainLoop construction / destruction =============================
 377
 378 BrowserMainLoop* BrowserMainLoop::GetInstance() {
 379   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 380   return g_current_browser_main_loop;
 381 }
 382
 383 BrowserMainLoop::BrowserMainLoop(const MainFunctionParams& parameters)
 384     : parameters_(parameters),
 385       parsed_command_line_(parameters.command_line),
 386       result_code_(RESULT_CODE_NORMAL_EXIT),
 387       created_threads_(false),
 388       // ContentMainRunner should have enabled tracing of the browser process
 389       // when kTraceStartup is in the command line.
 390       is_tracing_startup_(
 391           parameters.command_line.HasSwitch(switches::kTraceStartup)) {
 392   DCHECK(!g_current_browser_main_loop);
 393   g_current_browser_main_loop = this;
 394 }
 395
 396 BrowserMainLoop::~BrowserMainLoop() {
 397   DCHECK_EQ(this, g_current_browser_main_loop);
 398 #if !defined(OS_IOS)
 399   ui::Clipboard::DestroyClipboardForCurrentThread();
 400 #endif  // !defined(OS_IOS)
 401   g_current_browser_main_loop = NULL;
 402 }
 403
 404 void BrowserMainLoop::Init() {
 405   TRACE_EVENT0("startup", "BrowserMainLoop::Init");
 406   TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::Init");
 407
 408   parts_.reset(
 409       GetContentClient()->browser()->CreateBrowserMainParts(parameters_));
 410 }
 411
 412 // BrowserMainLoop stages ==================================================
 413
 414 void BrowserMainLoop::EarlyInitialization() {
 415   TRACE_EVENT0("startup", "BrowserMainLoop::EarlyInitialization");
 416   TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::EarlyInitialization");
 417
 418 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 419   // No thread should be created before this call, as SetupSandbox()
 420   // will end-up using fork().
 421   SetupSandbox(parsed_command_line_);
 422 #endif
 423
 424 #if defined(USE_X11)
 425   if (UsingInProcessGpu()) {
 426     if (!gfx::InitializeThreadedX11()) {
 427       LOG(ERROR) << "Failed to put Xlib into threaded mode.";
 428     }
 429   }
 430 #endif
 431
 432   // GLib's spawning of new processes is buggy, so it's important that at this
 433   // point GLib does not need to start DBUS. Chrome should always start with
 434   // DBUS_SESSION_BUS_ADDRESS properly set. See crbug.com/309093.
 435 #if defined(USE_GLIB)
 436   // g_type_init will be deprecated in 2.36. 2.35 is the development
 437   // version for 2.36, hence do not call g_type_init starting 2.35.
 438   // http://developer.gnome.org/gobject/unstable/gobject-Type-Information.html#g-type-init
 439 #if !GLIB_CHECK_VERSION(2, 35, 0)
 440   // GLib type system initialization. Needed at least for gconf,
 441   // used in net/proxy/proxy_config_service_linux.cc. Most likely
 442   // this is superfluous as gtk_init() ought to do this. It's
 443   // definitely harmless, so retained as a reminder of this
 444   // requirement for gconf.
 445   g_type_init();
 446 #endif
 447
 448   SetUpGLibLogHandler();
 449 #endif
 450
 451   if (parts_)
 452     parts_->PreEarlyInitialization();
 453
 454 #if defined(OS_MACOSX)
 455   // We use quite a few file descriptors for our IPC, and the default limit on
 456   // the Mac is low (256), so bump it up.
 457   base::SetFdLimit(1024);
 458 #endif
 459
 460 #if defined(OS_WIN)
 461   net::EnsureWinsockInit();
 462 #endif
 463
 464 #if !defined(USE_OPENSSL)
 465   // We want to be sure to init NSPR on the main thread.
 466   crypto::EnsureNSPRInit();
 467 #endif  // !defined(USE_OPENSSL)
 468
 469 #if !defined(OS_IOS)
 470   if (parsed_command_line_.HasSwitch(switches::kRendererProcessLimit)) {
 471     std::string limit_string = parsed_command_line_.GetSwitchValueASCII(
 472         switches::kRendererProcessLimit);
 473     size_t process_limit;
 474     if (base::StringToSizeT(limit_string, &process_limit)) {
 475       RenderProcessHost::SetMaxRendererProcessCount(process_limit);
 476     }
 477   }
 478 #endif  // !defined(OS_IOS)
 479
 480   if (parsed_command_line_.HasSwitch(switches::kEnableNativeGpuMemoryBuffers)) {
 481     BrowserGpuChannelHostFactory::EnableGpuMemoryBufferFactoryUsage(
 482         gfx::GpuMemoryBuffer::MAP);
 483     BrowserGpuChannelHostFactory::EnableGpuMemoryBufferFactoryUsage(
 484         gfx::GpuMemoryBuffer::PERSISTENT_MAP);
 485   }
 486
 487 #if defined(USE_OZONE)
 488   BrowserGpuChannelHostFactory::EnableGpuMemoryBufferFactoryUsage(
 489       gfx::GpuMemoryBuffer::SCANOUT);
 490 #endif
 491
 492   base::DiscardableMemoryAllocator::SetInstance(
 493       HostDiscardableSharedMemoryManager::current());
 494
 495   if (parts_)
 496     parts_->PostEarlyInitialization();
 497 }
 498
 499 void BrowserMainLoop::PreMainMessageLoopStart() {
 500   if (parts_) {
 501     TRACE_EVENT0("startup",
 502         "BrowserMainLoop::MainMessageLoopStart:PreMainMessageLoopStart");
 503     parts_->PreMainMessageLoopStart();
 504   }
 505
 506 #if defined(OS_WIN)
 507   // If we're running tests (ui_task is non-null), then the ResourceBundle
 508   // has already been initialized.
 509   if (!parameters_.ui_task) {
 510     // Override the configured locale with the user's preferred UI language.
 511     l10n_util::OverrideLocaleWithUILanguageList();
 512   }
 513 #endif
 514 }
 515
 516 void BrowserMainLoop::MainMessageLoopStart() {
 517   // DO NOT add more code here. Use PreMainMessageLoopStart() above or
 518   // PostMainMessageLoopStart() below.
 519
 520   TRACE_EVENT0("startup", "BrowserMainLoop::MainMessageLoopStart");
 521   TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::MainMessageLoopStart");
 522
 523   // Create a MessageLoop if one does not already exist for the current thread.
 524   if (!base::MessageLoop::current())
 525     main_message_loop_.reset(new base::MessageLoopForUI);
 526
 527   InitializeMainThread();
 528 }
 529
 530 void BrowserMainLoop::PostMainMessageLoopStart() {
 531   {
 532     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:SystemMonitor");
 533     system_monitor_.reset(new base::SystemMonitor);
 534   }
 535   {
 536     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:PowerMonitor");
 537     scoped_ptr<base::PowerMonitorSource> power_monitor_source(
 538       new base::PowerMonitorDeviceSource());
 539     power_monitor_.reset(new base::PowerMonitor(power_monitor_source.Pass()));
 540   }
 541   {
 542     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:HighResTimerManager");
 543     hi_res_timer_manager_.reset(new base::HighResolutionTimerManager);
 544   }
 545   {
 546     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:NetworkChangeNotifier");
 547     network_change_notifier_.reset(net::NetworkChangeNotifier::Create());
 548   }
 549
 550 #if !defined(OS_IOS)
 551   {
 552     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:MediaFeatures");
 553     media::InitializeMediaLibrary();
 554   }
 555   {
 556     TRACE_EVENT0("startup",
 557                  "BrowserMainLoop::Subsystem:ContentWebUIController");
 558     WebUIControllerFactory::RegisterFactory(
 559         ContentWebUIControllerFactory::GetInstance());
 560   }
 561
 562   {
 563     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:OnlineStateObserver");
 564     online_state_observer_.reset(new BrowserOnlineStateObserver);
 565   }
 566
 567   {
 568     system_stats_monitor_.reset(
 569         new base::trace_event::TraceEventSystemStatsMonitor(
 570             base::ThreadTaskRunnerHandle::Get()));
 571   }
 572 #endif  // !defined(OS_IOS)
 573
 574 #if defined(OS_WIN)
 575   system_message_window_.reset(new SystemMessageWindowWin);
 576 #endif
 577
 578   if (parts_)
 579     parts_->PostMainMessageLoopStart();
 580
 581 #if !defined(OS_IOS)
 582   // Start tracing to a file if needed. Only do this after starting the main
 583   // message loop to avoid calling MessagePumpForUI::ScheduleWork() before
 584   // MessagePumpForUI::Start() as it will crash the browser.
 585   if (is_tracing_startup_) {
 586     TRACE_EVENT0("startup", "BrowserMainLoop::InitStartupTracing");
 587     InitStartupTracing(parsed_command_line_);
 588   }
 589 #endif  // !defined(OS_IOS)
 590
 591 #if defined(OS_ANDROID)
 592   {
 593     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:SurfaceTextureManager");
 594     if (parsed_command_line_.HasSwitch(switches::kSingleProcess)) {
 595       SurfaceTextureManager::SetInstance(
 596           InProcessSurfaceTextureManager::GetInstance());
 597     } else {
 598       SurfaceTextureManager::SetInstance(
 599           BrowserSurfaceTextureManager::GetInstance());
 600     }
 601   }
 602
 603   if (!parsed_command_line_.HasSwitch(
 604       switches::kDisableScreenOrientationLock)) {
 605     TRACE_EVENT0("startup",
 606                  "BrowserMainLoop::Subsystem:ScreenOrientationProvider");
 607     screen_orientation_delegate_.reset(
 608         new ScreenOrientationDelegateAndroid());
 609     ScreenOrientationProvider::SetDelegate(screen_orientation_delegate_.get());
 610   }
 611 #endif
 612
 613 #if defined(OS_MACOSX) && !defined(OS_IOS)
 614   {
 615     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:IOSurfaceManager");
 616     if (parsed_command_line_.HasSwitch(switches::kSingleProcess)) {
 617       IOSurfaceManager::SetInstance(InProcessIOSurfaceManager::GetInstance());
 618     } else {
 619       IOSurfaceManager::SetInstance(BrowserIOSurfaceManager::GetInstance());
 620     }
 621   }
 622 #endif
 623
 624   if (parsed_command_line_.HasSwitch(switches::kMemoryMetrics)) {
 625     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:MemoryObserver");
 626     memory_observer_.reset(new MemoryObserver());
 627     base::MessageLoop::current()->AddTaskObserver(memory_observer_.get());
 628   }
 629
 630   if (parsed_command_line_.HasSwitch(
 631           switches::kEnableAggressiveDOMStorageFlushing)) {
 632     TRACE_EVENT0("startup",
 633                  "BrowserMainLoop::Subsystem:EnableAggressiveCommitDelay");
 634     DOMStorageArea::EnableAggressiveCommitDelay();
 635   }
 636
 637   base::trace_event::MemoryDumpManager::GetInstance()->Initialize();
 638
 639   // Enable the dump providers.
 640   base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(
 641       HostSharedBitmapManager::current());
 642
 643 #if defined(TCMALLOC_TRACE_MEMORY_SUPPORTED)
 644   trace_memory_controller_.reset(new base::trace_event::TraceMemoryController(
 645       base::MessageLoop::current()->task_runner(),
 646       ::HeapProfilerWithPseudoStackStart, ::HeapProfilerStop,
 647       ::GetHeapProfile));
 648 #endif
 649 }
 650
 651 int BrowserMainLoop::PreCreateThreads() {
 652   if (parts_) {
 653     TRACE_EVENT0("startup",
 654         "BrowserMainLoop::CreateThreads:PreCreateThreads");
 655     TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::PreCreateThreads");
 656
 657     result_code_ = parts_->PreCreateThreads();
 658   }
 659
 660   // TODO(chrisha): Abstract away this construction mess to a helper function,
 661   // once MemoryPressureMonitor is made a concrete class.
 662 #if defined(OS_CHROMEOS)
 663   if (chromeos::switches::MemoryPressureHandlingEnabled()) {
 664     memory_pressure_monitor_.reset(new base::chromeos::MemoryPressureMonitor(
 665         chromeos::switches::GetMemoryPressureThresholds()));
 666   }
 667 #elif defined(OS_MACOSX) && !defined(OS_IOS)
 668   memory_pressure_monitor_.reset(new base::mac::MemoryPressureMonitor());
 669 #elif defined(OS_WIN)
 670   memory_pressure_monitor_.reset(CreateWinMemoryPressureMonitor(
 671       parsed_command_line_));
 672 #endif
 673
 674 #if defined(ENABLE_PLUGINS)
 675   // Prior to any processing happening on the io thread, we create the
 676   // plugin service as it is predominantly used from the io thread,
 677   // but must be created on the main thread. The service ctor is
 678   // inexpensive and does not invoke the io_thread() accessor.
 679   {
 680     TRACE_EVENT0("startup", "BrowserMainLoop::CreateThreads:PluginService");
 681     PluginService::GetInstance()->Init();
 682   }
 683 #endif
 684
 685 #if defined(OS_MACOSX)
 686   {
 687     // Initialize AVFoundation if supported, for audio and video.
 688     TRACE_EVENT0("startup",
 689                  "BrowserMainLoop::CreateThreads:InitializeAVFoundation");
 690     AVFoundationGlue::InitializeAVFoundation();
 691   }
 692 #endif
 693
 694   // Need to initialize in-process GpuDataManager before creating threads.
 695   // It's unsafe to append the gpu command line switches to the global
 696   // CommandLine::ForCurrentProcess object after threads are created.
 697   if (UsingInProcessGpu()) {
 698     bool initialize_gpu_data_manager = true;
 699 #if defined(OS_ANDROID)
 700     if (!gfx::GLSurface::InitializeOneOff()) {
 701       // Single-process Android WebView supports no gpu.
 702       LOG(ERROR) << "GLSurface::InitializeOneOff failed";
 703       initialize_gpu_data_manager = false;
 704     }
 705 #endif
 706
 707     // Initialize the GpuDataManager before we set up the MessageLoops because
 708     // otherwise we'll trigger the assertion about doing IO on the UI thread.
 709     if (initialize_gpu_data_manager)
 710       GpuDataManagerImpl::GetInstance()->Initialize();
 711   }
 712
 713 #if !defined(OS_IOS) && (!defined(GOOGLE_CHROME_BUILD) || defined(OS_ANDROID))
 714   // Single-process is an unsupported and not fully tested mode, so
 715   // don't enable it for official Chrome builds (except on Android).
 716   if (parsed_command_line_.HasSwitch(switches::kSingleProcess))
 717     RenderProcessHost::SetRunRendererInProcess(true);
 718 #endif
 719
 720   return result_code_;
 721 }
 722
 723 void BrowserMainLoop::CreateStartupTasks() {
 724   TRACE_EVENT0("startup", "BrowserMainLoop::CreateStartupTasks");
 725   TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::CreateStartupTasks");
 726
 727   // First time through, we really want to create all the tasks
 728   if (!startup_task_runner_.get()) {
 729 #if defined(OS_ANDROID)
 730     startup_task_runner_ = make_scoped_ptr(
 731         new StartupTaskRunner(base::Bind(&BrowserStartupComplete),
 732                               base::ThreadTaskRunnerHandle::Get()));
 733 #else
 734     startup_task_runner_ = make_scoped_ptr(
 735         new StartupTaskRunner(base::Callback<void(int)>(),
 736                               base::ThreadTaskRunnerHandle::Get()));
 737 #endif
 738     StartupTask pre_create_threads =
 739         base::Bind(&BrowserMainLoop::PreCreateThreads, base::Unretained(this));
 740     startup_task_runner_->AddTask(pre_create_threads);
 741
 742     StartupTask create_threads =
 743         base::Bind(&BrowserMainLoop::CreateThreads, base::Unretained(this));
 744     startup_task_runner_->AddTask(create_threads);
 745
 746     StartupTask browser_thread_started = base::Bind(
 747         &BrowserMainLoop::BrowserThreadsStarted, base::Unretained(this));
 748     startup_task_runner_->AddTask(browser_thread_started);
 749
 750     StartupTask pre_main_message_loop_run = base::Bind(
 751         &BrowserMainLoop::PreMainMessageLoopRun, base::Unretained(this));
 752     startup_task_runner_->AddTask(pre_main_message_loop_run);
 753
 754 #if defined(OS_ANDROID)
 755     if (BrowserMayStartAsynchronously()) {
 756       startup_task_runner_->StartRunningTasksAsync();
 757     }
 758 #endif
 759   }
 760 #if defined(OS_ANDROID)
 761   if (!BrowserMayStartAsynchronously()) {
 762     // A second request for asynchronous startup can be ignored, so
 763     // StartupRunningTasksAsync is only called first time through. If, however,
 764     // this is a request for synchronous startup then it must override any
 765     // previous call for async startup, so we call RunAllTasksNow()
 766     // unconditionally.
 767     startup_task_runner_->RunAllTasksNow();
 768   }
 769 #else
 770   startup_task_runner_->RunAllTasksNow();
 771 #endif
 772 }
 773
 774 int BrowserMainLoop::CreateThreads() {
 775   TRACE_EVENT0("startup", "BrowserMainLoop::CreateThreads");
 776   TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::CreateThreads");
 777
 778   base::Thread::Options io_message_loop_options;
 779   io_message_loop_options.message_loop_type = base::MessageLoop::TYPE_IO;
 780   base::Thread::Options ui_message_loop_options;
 781   ui_message_loop_options.message_loop_type = base::MessageLoop::TYPE_UI;
 782
 783   // Start threads in the order they occur in the BrowserThread::ID
 784   // enumeration, except for BrowserThread::UI which is the main
 785   // thread.
 786   //
 787   // Must be size_t so we can increment it.
 788   for (size_t thread_id = BrowserThread::UI + 1;
 789        thread_id < BrowserThread::ID_COUNT;
 790        ++thread_id) {
 791     scoped_ptr<BrowserProcessSubThread>* thread_to_start = NULL;
 792     base::Thread::Options options;
 793
 794     switch (thread_id) {
 795       case BrowserThread::DB:
 796         TRACE_EVENT_BEGIN1("startup",
 797             "BrowserMainLoop::CreateThreads:start",
 798             "Thread", "BrowserThread::DB");
 799         thread_to_start = &db_thread_;
 800         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 801         break;
 802       case BrowserThread::FILE_USER_BLOCKING:
 803         TRACE_EVENT_BEGIN1("startup",
 804             "BrowserMainLoop::CreateThreads:start",
 805             "Thread", "BrowserThread::FILE_USER_BLOCKING");
 806         thread_to_start = &file_user_blocking_thread_;
 807         break;
 808       case BrowserThread::FILE:
 809         TRACE_EVENT_BEGIN1("startup",
 810             "BrowserMainLoop::CreateThreads:start",
 811             "Thread", "BrowserThread::FILE");
 812         thread_to_start = &file_thread_;
 813 #if defined(OS_WIN)
 814         // On Windows, the FILE thread needs to be have a UI message loop
 815         // which pumps messages in such a way that Google Update can
 816         // communicate back to us.
 817         options = ui_message_loop_options;
 818 #else
 819         options = io_message_loop_options;
 820 #endif
 821         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 822         break;
 823       case BrowserThread::PROCESS_LAUNCHER:
 824         TRACE_EVENT_BEGIN1("startup",
 825             "BrowserMainLoop::CreateThreads:start",
 826             "Thread", "BrowserThread::PROCESS_LAUNCHER");
 827         thread_to_start = &process_launcher_thread_;
 828         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 829         break;
 830       case BrowserThread::CACHE:
 831         TRACE_EVENT_BEGIN1("startup",
 832             "BrowserMainLoop::CreateThreads:start",
 833             "Thread", "BrowserThread::CACHE");
 834         thread_to_start = &cache_thread_;
 835         options = io_message_loop_options;
 836         options.timer_slack = base::TIMER_SLACK_MAXIMUM;
 837         break;
 838       case BrowserThread::IO:
 839         TRACE_EVENT_BEGIN1("startup",
 840             "BrowserMainLoop::CreateThreads:start",
 841             "Thread", "BrowserThread::IO");
 842         thread_to_start = &io_thread_;
 843         options = io_message_loop_options;
 844         break;
 845       case BrowserThread::UI:
 846       case BrowserThread::ID_COUNT:
 847       default:
 848         NOTREACHED();
 849         break;
 850     }
 851
 852     BrowserThread::ID id = static_cast<BrowserThread::ID>(thread_id);
 853
 854     if (thread_to_start) {
 855       (*thread_to_start).reset(new BrowserProcessSubThread(id));
 856       if (!(*thread_to_start)->StartWithOptions(options)) {
 857         LOG(FATAL) << "Failed to start the browser thread: id == " << id;
 858       }
 859     } else {
 860       NOTREACHED();
 861     }
 862
 863     TRACE_EVENT_END0("startup", "BrowserMainLoop::CreateThreads:start");
 864   }
 865   created_threads_ = true;
 866   return result_code_;
 867 }
 868
 869 int BrowserMainLoop::PreMainMessageLoopRun() {
 870   if (parts_) {
 871     TRACE_EVENT0("startup",
 872         "BrowserMainLoop::CreateThreads:PreMainMessageLoopRun");
 873     TRACK_SCOPED_REGION(
 874         "Startup", "BrowserMainLoop::PreMainMessageLoopRun");
 875
 876     parts_->PreMainMessageLoopRun();
 877   }
 878
 879   // If the UI thread blocks, the whole UI is unresponsive.
 880   // Do not allow disk IO from the UI thread.
 881   base::ThreadRestrictions::SetIOAllowed(false);
 882   base::ThreadRestrictions::DisallowWaiting();
 883   return result_code_;
 884 }
 885
 886 void BrowserMainLoop::RunMainMessageLoopParts() {
 887   TRACE_EVENT_BEGIN_ETW("BrowserMain:MESSAGE_LOOP", 0, "");
 888
 889   bool ran_main_loop = false;
 890   if (parts_)
 891     ran_main_loop = parts_->MainMessageLoopRun(&result_code_);
 892
 893   if (!ran_main_loop)
 894     MainMessageLoopRun();
 895
 896   TRACE_EVENT_END_ETW("BrowserMain:MESSAGE_LOOP", 0, "");
 897 }
 898
 899 void BrowserMainLoop::ShutdownThreadsAndCleanUp() {
 900   if (!created_threads_) {
 901     // Called early, nothing to do
 902     return;
 903   }
 904   TRACE_EVENT0("shutdown", "BrowserMainLoop::ShutdownThreadsAndCleanUp");
 905
 906   // Teardown may start in PostMainMessageLoopRun, and during teardown we
 907   // need to be able to perform IO.
 908   base::ThreadRestrictions::SetIOAllowed(true);
 909   BrowserThread::PostTask(
 910       BrowserThread::IO, FROM_HERE,
 911       base::Bind(base::IgnoreResult(&base::ThreadRestrictions::SetIOAllowed),
 912                  true));
 913
 914   mojo_shell_context_.reset();
 915
 916 #if !defined(OS_IOS)
 917   if (RenderProcessHost::run_renderer_in_process())
 918     RenderProcessHostImpl::ShutDownInProcessRenderer();
 919 #endif
 920
 921   if (parts_) {
 922     TRACE_EVENT0("shutdown",
 923                  "BrowserMainLoop::Subsystem:PostMainMessageLoopRun");
 924     parts_->PostMainMessageLoopRun();
 925   }
 926
 927   trace_memory_controller_.reset();
 928   system_stats_monitor_.reset();
 929
 930 #if !defined(OS_IOS)
 931   // Destroying the GpuProcessHostUIShims on the UI thread posts a task to
 932   // delete related objects on the GPU thread. This must be done before
 933   // stopping the GPU thread. The GPU thread will close IPC channels to renderer
 934   // processes so this has to happen before stopping the IO thread.
 935   {
 936     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:GPUProcessHostShim");
 937     GpuProcessHostUIShim::DestroyAll();
 938   }
 939   // Cancel pending requests and prevent new requests.
 940   if (resource_dispatcher_host_) {
 941     TRACE_EVENT0("shutdown",
 942                  "BrowserMainLoop::Subsystem:ResourceDispatcherHost");
 943     resource_dispatcher_host_.get()->Shutdown();
 944   }
 945
 946   memory_pressure_monitor_.reset();
 947
 948 #if defined(OS_MACOSX)
 949   BrowserCompositorMac::DisableRecyclingForShutdown();
 950 #endif
 951
 952 #if defined(USE_AURA) || defined(OS_MACOSX)
 953   {
 954     TRACE_EVENT0("shutdown",
 955                  "BrowserMainLoop::Subsystem:ImageTransportFactory");
 956     ImageTransportFactory::Terminate();
 957   }
 958 #endif
 959
 960 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 961   ZygoteHostImpl::GetInstance()->TearDownAfterLastChild();
 962 #endif  // defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 963
 964   // The device monitors are using |system_monitor_| as dependency, so delete
 965   // them before |system_monitor_| goes away.
 966   // On Mac and windows, the monitor needs to be destroyed on the same thread
 967   // as they were created. On Linux, the monitor will be deleted when IO thread
 968   // goes away.
 969 #if defined(OS_WIN)
 970   system_message_window_.reset();
 971 #elif defined(OS_MACOSX)
 972   device_monitor_mac_.reset();
 973 #endif
 974 #endif  // !defined(OS_IOS)
 975
 976   // Must be size_t so we can subtract from it.
 977   for (size_t thread_id = BrowserThread::ID_COUNT - 1;
 978        thread_id >= (BrowserThread::UI + 1);
 979        --thread_id) {
 980     // Find the thread object we want to stop. Looping over all valid
 981     // BrowserThread IDs and DCHECKing on a missing case in the switch
 982     // statement helps avoid a mismatch between this code and the
 983     // BrowserThread::ID enumeration.
 984     //
 985     // The destruction order is the reverse order of occurrence in the
 986     // BrowserThread::ID list. The rationale for the order is as
 987     // follows (need to be filled in a bit):
 988     //
 989     //
 990     // - The IO thread is the only user of the CACHE thread.
 991     //
 992     // - The PROCESS_LAUNCHER thread must be stopped after IO in case
 993     //   the IO thread posted a task to terminate a process on the
 994     //   process launcher thread.
 995     //
 996     // - (Not sure why DB stops last.)
 997     switch (thread_id) {
 998       case BrowserThread::DB: {
 999         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:DBThread");
1000         ResetThread_DB(db_thread_.Pass());
1001         break;
1002       }
1003       case BrowserThread::FILE: {
1004         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:FileThread");
1005 #if !defined(OS_IOS)
1006         // Clean up state that lives on or uses the file_thread_ before
1007         // it goes away.
1008         if (resource_dispatcher_host_)
1009           resource_dispatcher_host_.get()->save_file_manager()->Shutdown();
1010 #endif  // !defined(OS_IOS)
1011         ResetThread_FILE(file_thread_.Pass());
1012         break;
1013       }
1014       case BrowserThread::FILE_USER_BLOCKING: {
1015         TRACE_EVENT0("shutdown",
1016                       "BrowserMainLoop::Subsystem:FileUserBlockingThread");
1017         ResetThread_FILE_USER_BLOCKING(file_user_blocking_thread_.Pass());
1018         break;
1019       }
1020       case BrowserThread::PROCESS_LAUNCHER: {
1021         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:LauncherThread");
1022         ResetThread_PROCESS_LAUNCHER(process_launcher_thread_.Pass());
1023         break;
1024       }
1025       case BrowserThread::CACHE: {
1026         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:CacheThread");
1027         ResetThread_CACHE(cache_thread_.Pass());
1028         break;
1029       }
1030       case BrowserThread::IO: {
1031         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:IOThread");
1032         ResetThread_IO(io_thread_.Pass());
1033         break;
1034       }
1035       case BrowserThread::UI:
1036       case BrowserThread::ID_COUNT:
1037       default:
1038         NOTREACHED();
1039         break;
1040     }
1041   }
1042
1043 #if !defined(OS_IOS)
1044   {
1045     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:IndexedDBThread");
1046     ResetThread_IndexedDb(indexed_db_thread_.Pass());
1047   }
1048 #endif
1049
1050   // Close the blocking I/O pool after the other threads. Other threads such
1051   // as the I/O thread may need to schedule work like closing files or flushing
1052   // data during shutdown, so the blocking pool needs to be available. There
1053   // may also be slow operations pending that will blcok shutdown, so closing
1054   // it here (which will block until required operations are complete) gives
1055   // more head start for those operations to finish.
1056   {
1057     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:ThreadPool");
1058     BrowserThreadImpl::ShutdownThreadPool();
1059   }
1060
1061 #if !defined(OS_IOS)
1062   // Must happen after the IO thread is shutdown since this may be accessed from
1063   // it.
1064   {
1065     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:GPUChannelFactory");
1066     if (BrowserGpuChannelHostFactory::instance())
1067       BrowserGpuChannelHostFactory::Terminate();
1068   }
1069
1070   // Must happen after the I/O thread is shutdown since this class lives on the
1071   // I/O thread and isn't threadsafe.
1072   {
1073     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:GamepadService");
1074     GamepadService::GetInstance()->Terminate();
1075   }
1076   {
1077     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:SensorService");
1078     DeviceInertialSensorService::GetInstance()->Shutdown();
1079   }
1080   {
1081     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:BatteryStatusService");
1082     device::BatteryStatusService::GetInstance()->Shutdown();
1083   }
1084   {
1085     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:DeleteDataSources");
1086     URLDataManager::DeleteDataSources();
1087   }
1088 #endif  // !defined(OS_IOS)
1089
1090   if (parts_) {
1091     TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:PostDestroyThreads");
1092     parts_->PostDestroyThreads();
1093   }
1094 }
1095
1096 void BrowserMainLoop::StopStartupTracingTimer() {
1097   startup_trace_timer_.Stop();
1098 }
1099
1100 void BrowserMainLoop::InitializeMainThread() {
1101   TRACE_EVENT0("startup", "BrowserMainLoop::InitializeMainThread");
1102   static const char kThreadName[] = "CrBrowserMain";
1103   base::PlatformThread::SetName(kThreadName);
1104   if (main_message_loop_)
1105     main_message_loop_->set_thread_name(kThreadName);
1106
1107   // Register the main thread by instantiating it, but don't call any methods.
1108   main_thread_.reset(
1109       new BrowserThreadImpl(BrowserThread::UI, base::MessageLoop::current()));
1110 }
1111
1112 int BrowserMainLoop::BrowserThreadsStarted() {
1113   TRACE_EVENT0("startup", "BrowserMainLoop::BrowserThreadsStarted");
1114
1115 #if !defined(OS_IOS)
1116   indexed_db_thread_.reset(new base::Thread("IndexedDB"));
1117   indexed_db_thread_->Start();
1118 #endif
1119
1120 #if !defined(OS_IOS)
1121   HistogramSynchronizer::GetInstance();
1122
1123
1124   // GpuDataManager for in-process initialized in PreCreateThreads.
1125   bool initialize_gpu_data_manager = !UsingInProcessGpu();
1126 #if defined(OS_ANDROID)
1127   // Up the priority of anything that touches with display tasks
1128   // (this thread is UI thread, and io_thread_ is for IPCs).
1129   io_thread_->SetPriority(base::ThreadPriority::DISPLAY);
1130   base::PlatformThread::SetThreadPriority(base::PlatformThread::CurrentHandle(),
1131                                           base::ThreadPriority::DISPLAY);
1132
1133   // On Android, GLSurface::InitializeOneOff() must be called before
1134   // initalizing the GpuDataManagerImpl as it uses the GL bindings.
1135   // TODO(sievers): Shouldn't need to init full bindings to determine GL
1136   // version/vendor strings. crbug.com/326295
1137   if (initialize_gpu_data_manager) {
1138     // Note InitializeOneOff is not safe either for in-process gpu after
1139     // creating threads, since it may race with the gpu thread.
1140     if (!gfx::GLSurface::InitializeOneOff()) {
1141       LOG(FATAL) << "GLSurface::InitializeOneOff failed";
1142     }
1143   }
1144 #endif
1145
1146   if (initialize_gpu_data_manager)
1147     GpuDataManagerImpl::GetInstance()->Initialize();
1148
1149   bool always_uses_gpu = true;
1150   bool established_gpu_channel = false;
1151 #if defined(OS_ANDROID)
1152   // TODO(crbug.com/439322): This should be set to |true|.
1153   established_gpu_channel = false;
1154   BrowserGpuChannelHostFactory::Initialize(established_gpu_channel);
1155 #elif defined(USE_AURA) || defined(OS_MACOSX)
1156   established_gpu_channel = true;
1157   if (!GpuDataManagerImpl::GetInstance()->CanUseGpuBrowserCompositor() ||
1158       parsed_command_line_.HasSwitch(switches::kDisableGpuEarlyInit)) {
1159     established_gpu_channel = always_uses_gpu = false;
1160   }
1161   BrowserGpuChannelHostFactory::Initialize(established_gpu_channel);
1162   ImageTransportFactory::Initialize();
1163 #if defined(USE_AURA)
1164   if (aura::Env::GetInstance()) {
1165     aura::Env::GetInstance()->set_context_factory(GetContextFactory());
1166   }
1167 #endif  // defined(USE_AURA)
1168 #endif  // defined(OS_ANDROID)
1169
1170   // Enable the GpuMemoryBuffer dump provider with IO thread affinity. Note that
1171   // unregistration happens on the IO thread (See
1172   // BrowserProcessSubThread::IOThreadPreCleanUp).
1173   base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(
1174       BrowserGpuMemoryBufferManager::current(), io_thread_->task_runner());
1175
1176   {
1177     TRACE_EVENT0("startup", "BrowserThreadsStarted::Subsystem:AudioMan");
1178     audio_manager_.reset(media::AudioManager::CreateWithHangTimer(
1179         MediaInternals::GetInstance(), io_thread_->task_runner()));
1180   }
1181
1182   {
1183     TRACE_EVENT0("startup", "BrowserThreadsStarted::Subsystem:MidiManager");
1184     midi_manager_.reset(media::midi::MidiManager::Create());
1185   }
1186
1187 #if defined(OS_LINUX) && defined(USE_UDEV)
1188   device_monitor_linux_.reset(new DeviceMonitorLinux());
1189 #elif defined(OS_MACOSX)
1190   device_monitor_mac_.reset(new DeviceMonitorMac());
1191 #endif
1192
1193 #if defined(OS_WIN)
1194   UMA_HISTOGRAM_BOOLEAN("Windows.Win32kRendererLockdown",
1195                         IsWin32kRendererLockdownEnabled());
1196 #endif
1197   // RDH needs the IO thread to be created
1198   {
1199     TRACE_EVENT0("startup",
1200       "BrowserMainLoop::BrowserThreadsStarted:InitResourceDispatcherHost");
1201     resource_dispatcher_host_.reset(new ResourceDispatcherHostImpl());
1202   }
1203
1204   // MediaStreamManager needs the IO thread to be created.
1205   {
1206     TRACE_EVENT0("startup",
1207       "BrowserMainLoop::BrowserThreadsStarted:InitMediaStreamManager");
1208     media_stream_manager_.reset(new MediaStreamManager(audio_manager_.get()));
1209   }
1210
1211   {
1212     TRACE_EVENT0("startup",
1213       "BrowserMainLoop::BrowserThreadsStarted:InitSpeechRecognition");
1214     speech_recognition_manager_.reset(new SpeechRecognitionManagerImpl(
1215         audio_manager_.get(), media_stream_manager_.get()));
1216   }
1217
1218   {
1219     TRACE_EVENT0(
1220         "startup",
1221         "BrowserMainLoop::BrowserThreadsStarted::InitUserInputMonitor");
1222     user_input_monitor_ = media::UserInputMonitor::Create(
1223         io_thread_->task_runner(), main_thread_->task_runner());
1224   }
1225
1226   {
1227     TRACE_EVENT0("startup",
1228                  "BrowserMainLoop::BrowserThreadsStarted::TimeZoneMonitor");
1229     time_zone_monitor_ = TimeZoneMonitor::Create();
1230   }
1231
1232   // Alert the clipboard class to which threads are allowed to access the
1233   // clipboard:
1234   std::vector<base::PlatformThreadId> allowed_clipboard_threads;
1235   // The current thread is the UI thread.
1236   allowed_clipboard_threads.push_back(base::PlatformThread::CurrentId());
1237 #if defined(OS_WIN)
1238   // On Windows, clipboards are also used on the FILE or IO threads.
1239   allowed_clipboard_threads.push_back(file_thread_->thread_id());
1240   allowed_clipboard_threads.push_back(io_thread_->thread_id());
1241 #endif
1242   ui::Clipboard::SetAllowedThreads(allowed_clipboard_threads);
1243
1244   // When running the GPU thread in-process, avoid optimistically starting it
1245   // since creating the GPU thread races against creation of the one-and-only
1246   // ChildProcess instance which is created by the renderer thread.
1247   if (GpuDataManagerImpl::GetInstance()->GpuAccessAllowed(NULL) &&
1248       !established_gpu_channel &&
1249       always_uses_gpu &&
1250       !UsingInProcessGpu()) {
1251     TRACE_EVENT_INSTANT0("gpu", "Post task to launch GPU process",
1252                          TRACE_EVENT_SCOPE_THREAD);
1253     BrowserThread::PostTask(
1254         BrowserThread::IO, FROM_HERE,
1255         base::Bind(base::IgnoreResult(&GpuProcessHost::Get),
1256                    GpuProcessHost::GPU_PROCESS_KIND_SANDBOXED,
1257                    CAUSE_FOR_GPU_LAUNCH_BROWSER_STARTUP));
1258   }
1259
1260 #if defined(OS_MACOSX)
1261   ThemeHelperMac::GetInstance();
1262   SystemHotkeyHelperMac::GetInstance()->DeferredLoadSystemHotkeys();
1263   if (ShouldEnableBootstrapSandbox()) {
1264     TRACE_EVENT0("startup",
1265                  "BrowserMainLoop::BrowserThreadsStarted:BootstrapSandbox");
1266     CHECK(GetBootstrapSandbox());
1267   }
1268 #endif  // defined(OS_MACOSX)
1269
1270 #endif  // !defined(OS_IOS)
1271
1272   mojo_shell_context_.reset(new MojoShellContext);
1273
1274   return result_code_;
1275 }
1276
1277 bool BrowserMainLoop::UsingInProcessGpu() const {
1278   return parsed_command_line_.HasSwitch(switches::kSingleProcess) ||
1279          parsed_command_line_.HasSwitch(switches::kInProcessGPU);
1280 }
1281
1282 bool BrowserMainLoop::InitializeToolkit() {
1283   TRACE_EVENT0("startup", "BrowserMainLoop::InitializeToolkit");
1284   TRACK_SCOPED_REGION("Startup", "BrowserMainLoop::InitializeToolkit");
1285
1286   // TODO(evan): this function is rather subtle, due to the variety
1287   // of intersecting ifdefs we have.  To keep it easy to follow, there
1288   // are no #else branches on any #ifs.
1289   // TODO(stevenjb): Move platform specific code into platform specific Parts
1290   // (Need to add InitializeToolkit stage to BrowserParts).
1291   // See also GTK setup in EarlyInitialization, above, and associated comments.
1292
1293 #if defined(OS_WIN)
1294   // Init common control sex.
1295   INITCOMMONCONTROLSEX config;
1296   config.dwSize = sizeof(config);
1297   config.dwICC = ICC_WIN95_CLASSES;
1298   if (!InitCommonControlsEx(&config))
1299     PLOG(FATAL);
1300 #endif
1301
1302 #if defined(USE_AURA)
1303
1304 #if defined(USE_X11)
1305   if (!gfx::GetXDisplay())
1306     return false;
1307 #endif
1308
1309   // Env creates the compositor. Aura widgets need the compositor to be created
1310   // before they can be initialized by the browser.
1311   aura::Env::CreateInstance(true);
1312 #endif  // defined(USE_AURA)
1313
1314   if (parts_)
1315     parts_->ToolkitInitialized();
1316
1317   return true;
1318 }
1319
1320 void BrowserMainLoop::MainMessageLoopRun() {
1321 #if defined(OS_ANDROID)
1322   // Android's main message loop is the Java message loop.
1323   NOTREACHED();
1324 #else
1325   DCHECK(base::MessageLoopForUI::IsCurrent());
1326   if (parameters_.ui_task) {
1327     base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE,
1328                                                   *parameters_.ui_task);
1329   }
1330
1331   base::RunLoop run_loop;
1332   run_loop.Run();
1333 #endif
1334 }
1335
1336 base::FilePath BrowserMainLoop::GetStartupTraceFileName(
1337     const base::CommandLine& command_line) const {
1338   base::FilePath trace_file = command_line.GetSwitchValuePath(
1339       switches::kTraceStartupFile);
1340   // trace_file = "none" means that startup events will show up for the next
1341   // begin/end tracing (via about:tracing or AutomationProxy::BeginTracing/
1342   // EndTracing, for example).
1343   if (trace_file == base::FilePath().AppendASCII("none"))
1344     return trace_file;
1345
1346   if (trace_file.empty()) {
1347 #if defined(OS_ANDROID)
1348     TracingControllerAndroid::GenerateTracingFilePath(&trace_file);
1349 #else
1350     // Default to saving the startup trace into the current dir.
1351     trace_file = base::FilePath().AppendASCII("chrometrace.log");
1352 #endif
1353   }
1354
1355   return trace_file;
1356 }
1357
1358 void BrowserMainLoop::InitStartupTracing(
1359     const base::CommandLine& command_line) {
1360   DCHECK(is_tracing_startup_);
1361
1362   startup_trace_file_ = GetStartupTraceFileName(parsed_command_line_);
1363
1364   std::string delay_str = command_line.GetSwitchValueASCII(
1365       switches::kTraceStartupDuration);
1366   int delay_secs = 5;
1367   if (!delay_str.empty() && !base::StringToInt(delay_str, &delay_secs)) {
1368     DLOG(WARNING) << "Could not parse --" << switches::kTraceStartupDuration
1369         << "=" << delay_str << " defaulting to 5 (secs)";
1370     delay_secs = 5;
1371   }
1372
1373   startup_trace_timer_.Start(FROM_HERE,
1374                              base::TimeDelta::FromSeconds(delay_secs),
1375                              this,
1376                              &BrowserMainLoop::EndStartupTracing);
1377 }
1378
1379 void BrowserMainLoop::EndStartupTracing() {
1380   DCHECK(is_tracing_startup_);
1381
1382   is_tracing_startup_ = false;
1383   TracingController::GetInstance()->DisableRecording(
1384       TracingController::CreateFileSink(
1385           startup_trace_file_,
1386           base::Bind(OnStoppedStartupTracing, startup_trace_file_)));
1387 }
1388
1389 }  // namespace content