chrome/browser/metrics/chrome_metrics_service_client.cc

   1 // Copyright 2014 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 "chrome/browser/metrics/chrome_metrics_service_client.h"
   6
   7 #include <vector>
   8
   9 #include "base/bind.h"
  10 #include "base/callback.h"
  11 #include "base/command_line.h"
  12 #include "base/files/file_path.h"
  13 #include "base/logging.h"
  14 #include "base/metrics/histogram.h"
  15 #include "base/prefs/pref_registry_simple.h"
  16 #include "base/prefs/pref_service.h"
  17 #include "base/rand_util.h"
  18 #include "base/strings/string16.h"
  19 #include "base/threading/platform_thread.h"
  20 #include "chrome/browser/browser_process.h"
  21 #include "chrome/browser/chrome_notification_types.h"
  22 #include "chrome/browser/google/google_brand.h"
  23 #include "chrome/browser/metrics/chrome_stability_metrics_provider.h"
  24 #include "chrome/browser/metrics/time_ticks_experiment_win.h"
  25 #include "chrome/browser/ui/browser_otr_state.h"
  26 #include "chrome/common/channel_info.h"
  27 #include "chrome/common/chrome_constants.h"
  28 #include "chrome/common/chrome_paths.h"
  29 #include "chrome/common/chrome_switches.h"
  30 #include "chrome/common/crash_keys.h"
  31 #include "chrome/common/metrics/version_utils.h"
  32 #include "chrome/common/pref_names.h"
  33 #include "components/metrics/call_stack_profile_metrics_provider.h"
  34 #include "components/metrics/drive_metrics_provider.h"
  35 #include "components/metrics/gpu/gpu_metrics_provider.h"
  36 #include "components/metrics/metrics_service.h"
  37 #include "components/metrics/net/net_metrics_log_uploader.h"
  38 #include "components/metrics/net/network_metrics_provider.h"
  39 #include "components/metrics/profiler/profiler_metrics_provider.h"
  40 #include "components/metrics/profiler/tracking_synchronizer.h"
  41 #include "components/metrics/url_constants.h"
  42 #include "components/omnibox/browser/omnibox_metrics_provider.h"
  43 #include "components/variations/variations_associated_data.h"
  44 #include "components/version_info/version_info.h"
  45 #include "content/public/browser/browser_thread.h"
  46 #include "content/public/browser/histogram_fetcher.h"
  47 #include "content/public/browser/notification_service.h"
  48
  49 #if defined(OS_ANDROID)
  50 #include "chrome/browser/metrics/android_metrics_provider.h"
  51 #endif
  52
  53 #if defined(ENABLE_PRINT_PREVIEW)
  54 #include "chrome/browser/service_process/service_process_control.h"
  55 #endif
  56
  57 #if defined(ENABLE_EXTENSIONS)
  58 #include "chrome/browser/metrics/extensions_metrics_provider.h"
  59 #endif
  60
  61 #if defined(ENABLE_PLUGINS)
  62 #include "chrome/browser/metrics/plugin_metrics_provider.h"
  63 #endif
  64
  65 #if defined(OS_CHROMEOS)
  66 #include "chrome/browser/metrics/chromeos_metrics_provider.h"
  67 #include "chrome/browser/metrics/signin_status_metrics_provider_chromeos.h"
  68 #endif
  69
  70 #if defined(OS_WIN)
  71 #include <windows.h>
  72 #include "chrome/browser/metrics/google_update_metrics_provider_win.h"
  73 #include "components/browser_watcher/watcher_metrics_provider_win.h"
  74 #endif
  75
  76 #if !defined(OS_CHROMEOS)
  77 #include "chrome/browser/metrics/signin_status_metrics_provider.h"
  78 #endif  // !defined(OS_CHROMEOS)
  79
  80 namespace {
  81
  82 // This specifies the amount of time to wait for all renderers to send their
  83 // data.
  84 const int kMaxHistogramGatheringWaitDuration = 60000;  // 60 seconds.
  85
  86 // Standard interval between log uploads, in seconds.
  87 #if defined(OS_ANDROID) || defined(OS_IOS)
  88 const int kStandardUploadIntervalSeconds = 5 * 60;  // Five minutes.
  89 const int kStandardUploadIntervalCellularSeconds = 15 * 60;  // Fifteen minutes.
  90 #else
  91 const int kStandardUploadIntervalSeconds = 30 * 60;  // Thirty minutes.
  92 #endif
  93
  94 // Returns true if current connection type is cellular and user is assigned to
  95 // experimental group for enabled cellular uploads.
  96 bool IsCellularLogicEnabled() {
  97   if (variations::GetVariationParamValue("UMA_EnableCellularLogUpload",
  98                                          "Enabled") != "true" ||
  99       variations::GetVariationParamValue("UMA_EnableCellularLogUpload",
 100                                          "Optimize") == "false") {
 101     return false;
 102   }
 103
 104   return net::NetworkChangeNotifier::IsConnectionCellular(
 105       net::NetworkChangeNotifier::GetConnectionType());
 106 }
 107
 108 // Checks whether it is the first time that cellular uploads logic should be
 109 // enabled based on whether the the preference for that logic is initialized.
 110 // This should happen only once as the used preference will be initialized
 111 // afterwards in |UmaSessionStats.java|.
 112 bool ShouldClearSavedMetrics() {
 113 #if defined(OS_ANDROID)
 114   PrefService* local_state = g_browser_process->local_state();
 115   return !local_state->HasPrefPath(prefs::kMetricsReportingEnabled) &&
 116          variations::GetVariationParamValue("UMA_EnableCellularLogUpload",
 117                                             "Enabled") == "true";
 118 #else
 119   return false;
 120 #endif
 121 }
 122
 123 }  // namespace
 124
 125
 126 ChromeMetricsServiceClient::ChromeMetricsServiceClient(
 127     metrics::MetricsStateManager* state_manager)
 128     : metrics_state_manager_(state_manager),
 129       chromeos_metrics_provider_(nullptr),
 130       waiting_for_collect_final_metrics_step_(false),
 131       num_async_histogram_fetches_in_progress_(0),
 132       profiler_metrics_provider_(nullptr),
 133 #if defined(ENABLE_PLUGINS)
 134       plugin_metrics_provider_(nullptr),
 135 #endif
 136 #if defined(OS_WIN)
 137       google_update_metrics_provider_(nullptr),
 138 #endif
 139       drive_metrics_provider_(nullptr),
 140       start_time_(base::TimeTicks::Now()),
 141       has_uploaded_profiler_data_(false),
 142       weak_ptr_factory_(this) {
 143   DCHECK(thread_checker_.CalledOnValidThread());
 144   RecordCommandLineMetrics();
 145   RegisterForNotifications();
 146 }
 147
 148 ChromeMetricsServiceClient::~ChromeMetricsServiceClient() {
 149   DCHECK(thread_checker_.CalledOnValidThread());
 150 }
 151
 152 // static
 153 scoped_ptr<ChromeMetricsServiceClient> ChromeMetricsServiceClient::Create(
 154     metrics::MetricsStateManager* state_manager,
 155     PrefService* local_state) {
 156   // Perform two-phase initialization so that |client->metrics_service_| only
 157   // receives pointers to fully constructed objects.
 158   scoped_ptr<ChromeMetricsServiceClient> client(
 159       new ChromeMetricsServiceClient(state_manager));
 160   client->Initialize();
 161
 162   return client.Pass();
 163 }
 164
 165 // static
 166 void ChromeMetricsServiceClient::RegisterPrefs(PrefRegistrySimple* registry) {
 167   registry->RegisterInt64Pref(prefs::kUninstallLastLaunchTimeSec, 0);
 168   registry->RegisterInt64Pref(prefs::kUninstallLastObservedRunTimeSec, 0);
 169
 170   metrics::MetricsService::RegisterPrefs(registry);
 171   ChromeStabilityMetricsProvider::RegisterPrefs(registry);
 172
 173 #if defined(OS_ANDROID)
 174   AndroidMetricsProvider::RegisterPrefs(registry);
 175 #endif  // defined(OS_ANDROID)
 176
 177 #if defined(ENABLE_PLUGINS)
 178   PluginMetricsProvider::RegisterPrefs(registry);
 179 #endif  // defined(ENABLE_PLUGINS)
 180 }
 181
 182 void ChromeMetricsServiceClient::SetMetricsClientId(
 183     const std::string& client_id) {
 184   crash_keys::SetMetricsClientIdFromGUID(client_id);
 185 }
 186
 187 void ChromeMetricsServiceClient::OnRecordingDisabled() {
 188   crash_keys::ClearMetricsClientId();
 189 }
 190
 191 bool ChromeMetricsServiceClient::IsOffTheRecordSessionActive() {
 192   return chrome::IsOffTheRecordSessionActive();
 193 }
 194
 195 int32 ChromeMetricsServiceClient::GetProduct() {
 196   return metrics::ChromeUserMetricsExtension::CHROME;
 197 }
 198
 199 std::string ChromeMetricsServiceClient::GetApplicationLocale() {
 200   return g_browser_process->GetApplicationLocale();
 201 }
 202
 203 bool ChromeMetricsServiceClient::GetBrand(std::string* brand_code) {
 204   return google_brand::GetBrand(brand_code);
 205 }
 206
 207 metrics::SystemProfileProto::Channel ChromeMetricsServiceClient::GetChannel() {
 208   return metrics::AsProtobufChannel(chrome::GetChannel());
 209 }
 210
 211 std::string ChromeMetricsServiceClient::GetVersionString() {
 212   return metrics::GetVersionString();
 213 }
 214
 215 void ChromeMetricsServiceClient::OnLogUploadComplete() {
 216   // Collect time ticks stats after each UMA upload.
 217 #if defined(OS_WIN)
 218   chrome::CollectTimeTicksStats();
 219 #endif
 220 }
 221
 222 void ChromeMetricsServiceClient::InitializeSystemProfileMetrics(
 223     const base::Closure& done_callback) {
 224   finished_init_task_callback_ = done_callback;
 225   base::Closure got_hardware_class_callback =
 226       base::Bind(&ChromeMetricsServiceClient::OnInitTaskGotHardwareClass,
 227                  weak_ptr_factory_.GetWeakPtr());
 228 #if defined(OS_CHROMEOS)
 229   chromeos_metrics_provider_->InitTaskGetHardwareClass(
 230       got_hardware_class_callback);
 231 #else
 232   got_hardware_class_callback.Run();
 233 #endif  // defined(OS_CHROMEOS)
 234 }
 235
 236 void ChromeMetricsServiceClient::CollectFinalMetricsForLog(
 237     const base::Closure& done_callback) {
 238   DCHECK(thread_checker_.CalledOnValidThread());
 239
 240   collect_final_metrics_done_callback_ = done_callback;
 241
 242   if (ShouldIncludeProfilerDataInLog()) {
 243     // Fetch profiler data. This will call into
 244     // |FinishedReceivingProfilerData()| when the task completes.
 245     metrics::TrackingSynchronizer::FetchProfilerDataAsynchronously(
 246         weak_ptr_factory_.GetWeakPtr());
 247   } else {
 248     CollectFinalHistograms();
 249   }
 250 }
 251
 252 scoped_ptr<metrics::MetricsLogUploader>
 253 ChromeMetricsServiceClient::CreateUploader(
 254     const base::Callback<void(int)>& on_upload_complete) {
 255   return scoped_ptr<metrics::MetricsLogUploader>(
 256       new metrics::NetMetricsLogUploader(
 257           g_browser_process->system_request_context(),
 258           metrics::kDefaultMetricsServerUrl,
 259           metrics::kDefaultMetricsMimeType,
 260           on_upload_complete));
 261 }
 262
 263 base::TimeDelta ChromeMetricsServiceClient::GetStandardUploadInterval() {
 264 #if defined(OS_ANDROID) || defined(OS_IOS)
 265   if (IsCellularLogicEnabled())
 266     return base::TimeDelta::FromSeconds(kStandardUploadIntervalCellularSeconds);
 267 #endif
 268   return base::TimeDelta::FromSeconds(kStandardUploadIntervalSeconds);
 269 }
 270
 271 base::string16 ChromeMetricsServiceClient::GetRegistryBackupKey() {
 272 #if defined(OS_WIN)
 273   return L"Software\\" PRODUCT_STRING_PATH L"\\StabilityMetrics";
 274 #else
 275   return base::string16();
 276 #endif
 277 }
 278
 279 void ChromeMetricsServiceClient::LogPluginLoadingError(
 280     const base::FilePath& plugin_path) {
 281 #if defined(ENABLE_PLUGINS)
 282   plugin_metrics_provider_->LogPluginLoadingError(plugin_path);
 283 #else
 284   NOTREACHED();
 285 #endif  // defined(ENABLE_PLUGINS)
 286 }
 287
 288 void ChromeMetricsServiceClient::Initialize() {
 289   // Clear metrics reports if it is the first time cellular upload logic should
 290   // apply to avoid sudden bulk uploads. It needs to be done before initializing
 291   // metrics service so that metrics log manager is initialized correctly.
 292   if (ShouldClearSavedMetrics()) {
 293     PrefService* local_state = g_browser_process->local_state();
 294     local_state->ClearPref(metrics::prefs::kMetricsInitialLogs);
 295     local_state->ClearPref(metrics::prefs::kMetricsOngoingLogs);
 296   }
 297
 298   metrics_service_.reset(new metrics::MetricsService(
 299       metrics_state_manager_, this, g_browser_process->local_state()));
 300
 301   // Register metrics providers.
 302 #if defined(ENABLE_EXTENSIONS)
 303   metrics_service_->RegisterMetricsProvider(
 304       scoped_ptr<metrics::MetricsProvider>(
 305           new ExtensionsMetricsProvider(metrics_state_manager_)));
 306 #endif
 307   metrics_service_->RegisterMetricsProvider(
 308       scoped_ptr<metrics::MetricsProvider>(new metrics::NetworkMetricsProvider(
 309           content::BrowserThread::GetBlockingPool())));
 310
 311   // Currently, we configure OmniboxMetricsProvider to not log events to UMA
 312   // if there is a single incognito session visible. In the future, it may
 313   // be worth revisiting this to still log events from non-incognito sessions.
 314   metrics_service_->RegisterMetricsProvider(
 315       scoped_ptr<metrics::MetricsProvider>(new OmniboxMetricsProvider(
 316           base::Bind(&chrome::IsOffTheRecordSessionActive))));
 317   metrics_service_->RegisterMetricsProvider(
 318       scoped_ptr<metrics::MetricsProvider>(new ChromeStabilityMetricsProvider(
 319           g_browser_process->local_state())));
 320   metrics_service_->RegisterMetricsProvider(
 321       scoped_ptr<metrics::MetricsProvider>(new metrics::GPUMetricsProvider));
 322
 323   drive_metrics_provider_ = new metrics::DriveMetricsProvider(
 324       content::BrowserThread::GetMessageLoopProxyForThread(
 325           content::BrowserThread::FILE),
 326       chrome::FILE_LOCAL_STATE);
 327   metrics_service_->RegisterMetricsProvider(
 328       scoped_ptr<metrics::MetricsProvider>(drive_metrics_provider_));
 329
 330   profiler_metrics_provider_ =
 331       new metrics::ProfilerMetricsProvider(base::Bind(&IsCellularLogicEnabled));
 332   metrics_service_->RegisterMetricsProvider(
 333       scoped_ptr<metrics::MetricsProvider>(profiler_metrics_provider_));
 334
 335   metrics_service_->RegisterMetricsProvider(
 336       scoped_ptr<metrics::MetricsProvider>(
 337           new metrics::CallStackProfileMetricsProvider));
 338
 339 #if defined(OS_ANDROID)
 340   metrics_service_->RegisterMetricsProvider(
 341       scoped_ptr<metrics::MetricsProvider>(
 342           new AndroidMetricsProvider(g_browser_process->local_state())));
 343 #endif  // defined(OS_ANDROID)
 344
 345 #if defined(OS_WIN)
 346   google_update_metrics_provider_ = new GoogleUpdateMetricsProviderWin;
 347   metrics_service_->RegisterMetricsProvider(
 348       scoped_ptr<metrics::MetricsProvider>(google_update_metrics_provider_));
 349
 350   // Report exit funnels for canary and dev only.
 351   bool report_exit_funnels = false;
 352   switch (chrome::GetChannel()) {
 353     case version_info::Channel::CANARY:
 354     case version_info::Channel::DEV:
 355       report_exit_funnels = true;
 356       break;
 357     case version_info::Channel::UNKNOWN:
 358     case version_info::Channel::BETA:
 359     case version_info::Channel::STABLE:
 360       // report_exit_funnels was initialized to the right value above.
 361       DCHECK(!report_exit_funnels);
 362       break;
 363   }
 364
 365   metrics_service_->RegisterMetricsProvider(
 366       scoped_ptr<metrics::MetricsProvider>(
 367           new browser_watcher::WatcherMetricsProviderWin(
 368               chrome::kBrowserExitCodesRegistryPath, report_exit_funnels)));
 369 #endif  // defined(OS_WIN)
 370
 371 #if defined(ENABLE_PLUGINS)
 372   plugin_metrics_provider_ =
 373       new PluginMetricsProvider(g_browser_process->local_state());
 374   metrics_service_->RegisterMetricsProvider(
 375       scoped_ptr<metrics::MetricsProvider>(plugin_metrics_provider_));
 376 #endif  // defined(ENABLE_PLUGINS)
 377
 378 #if defined(OS_CHROMEOS)
 379   ChromeOSMetricsProvider* chromeos_metrics_provider =
 380       new ChromeOSMetricsProvider;
 381   chromeos_metrics_provider_ = chromeos_metrics_provider;
 382   metrics_service_->RegisterMetricsProvider(
 383       scoped_ptr<metrics::MetricsProvider>(chromeos_metrics_provider));
 384
 385   SigninStatusMetricsProviderChromeOS* signin_metrics_provider_cros =
 386       new SigninStatusMetricsProviderChromeOS;
 387   metrics_service_->RegisterMetricsProvider(
 388       scoped_ptr<metrics::MetricsProvider>(signin_metrics_provider_cros));
 389 #endif  // defined(OS_CHROMEOS)
 390
 391 #if !defined(OS_CHROMEOS)
 392   metrics_service_->RegisterMetricsProvider(
 393       scoped_ptr<metrics::MetricsProvider>(
 394           SigninStatusMetricsProvider::CreateInstance()));
 395 #endif  // !defined(OS_CHROMEOS)
 396
 397   // Clear stability metrics if it is the first time cellular upload logic
 398   // should apply to avoid sudden bulk uploads. It needs to be done after all
 399   // providers are registered.
 400   if (ShouldClearSavedMetrics())
 401     metrics_service_->ClearSavedStabilityMetrics();
 402 }
 403
 404 void ChromeMetricsServiceClient::OnInitTaskGotHardwareClass() {
 405   const base::Closure got_plugin_info_callback =
 406       base::Bind(&ChromeMetricsServiceClient::OnInitTaskGotPluginInfo,
 407                  weak_ptr_factory_.GetWeakPtr());
 408
 409 #if defined(ENABLE_PLUGINS)
 410   plugin_metrics_provider_->GetPluginInformation(got_plugin_info_callback);
 411 #else
 412   got_plugin_info_callback.Run();
 413 #endif  // defined(ENABLE_PLUGINS)
 414 }
 415
 416 void ChromeMetricsServiceClient::OnInitTaskGotPluginInfo() {
 417   const base::Closure got_metrics_callback =
 418       base::Bind(&ChromeMetricsServiceClient::OnInitTaskGotGoogleUpdateData,
 419                  weak_ptr_factory_.GetWeakPtr());
 420
 421 #if defined(OS_WIN) && defined(GOOGLE_CHROME_BUILD)
 422   google_update_metrics_provider_->GetGoogleUpdateData(got_metrics_callback);
 423 #else
 424   got_metrics_callback.Run();
 425 #endif  // defined(OS_WIN) && defined(GOOGLE_CHROME_BUILD)
 426 }
 427
 428 void ChromeMetricsServiceClient::OnInitTaskGotGoogleUpdateData() {
 429   drive_metrics_provider_->GetDriveMetrics(
 430       base::Bind(&ChromeMetricsServiceClient::OnInitTaskGotDriveMetrics,
 431                  weak_ptr_factory_.GetWeakPtr()));
 432 }
 433
 434 void ChromeMetricsServiceClient::OnInitTaskGotDriveMetrics() {
 435   finished_init_task_callback_.Run();
 436 }
 437
 438 bool ChromeMetricsServiceClient::ShouldIncludeProfilerDataInLog() {
 439   // Upload profiler data at most once per session.
 440   if (has_uploaded_profiler_data_)
 441     return false;
 442
 443   // For each log, flip a fair coin. Thus, profiler data is sent with the first
 444   // log with probability 50%, with the second log with probability 25%, and so
 445   // on. As a result, uploaded data is biased toward earlier logs.
 446   // TODO(isherman): Explore other possible algorithms, and choose one that
 447   // might be more appropriate.  For example, it might be reasonable to include
 448   // profiler data with some fixed probability, so that a given client might
 449   // upload profiler data more than once; but on average, clients won't upload
 450   // too much data.
 451   if (base::RandDouble() < 0.5)
 452     return false;
 453
 454   has_uploaded_profiler_data_ = true;
 455   return true;
 456 }
 457
 458 void ChromeMetricsServiceClient::ReceivedProfilerData(
 459     const metrics::ProfilerDataAttributes& attributes,
 460     const tracked_objects::ProcessDataPhaseSnapshot& process_data_phase,
 461     const metrics::ProfilerEvents& past_events) {
 462   profiler_metrics_provider_->RecordProfilerData(
 463       process_data_phase, attributes.process_id, attributes.process_type,
 464       attributes.profiling_phase, attributes.phase_start - start_time_,
 465       attributes.phase_finish - start_time_, past_events);
 466 }
 467
 468 void ChromeMetricsServiceClient::FinishedReceivingProfilerData() {
 469   CollectFinalHistograms();
 470 }
 471
 472 void ChromeMetricsServiceClient::CollectFinalHistograms() {
 473   DCHECK(thread_checker_.CalledOnValidThread());
 474
 475   // Begin the multi-step process of collecting memory usage histograms:
 476   // First spawn a task to collect the memory details; when that task is
 477   // finished, it will call OnMemoryDetailCollectionDone. That will in turn
 478   // call HistogramSynchronization to collect histograms from all renderers and
 479   // then call OnHistogramSynchronizationDone to continue processing.
 480   DCHECK(!waiting_for_collect_final_metrics_step_);
 481   waiting_for_collect_final_metrics_step_ = true;
 482
 483   base::Closure callback =
 484       base::Bind(&ChromeMetricsServiceClient::OnMemoryDetailCollectionDone,
 485                  weak_ptr_factory_.GetWeakPtr());
 486
 487   scoped_refptr<MetricsMemoryDetails> details(
 488       new MetricsMemoryDetails(callback, &memory_growth_tracker_));
 489   details->StartFetch(MemoryDetails::FROM_CHROME_ONLY);
 490 }
 491
 492 void ChromeMetricsServiceClient::OnMemoryDetailCollectionDone() {
 493   DCHECK(thread_checker_.CalledOnValidThread());
 494
 495   // This function should only be called as the callback from an ansynchronous
 496   // step.
 497   DCHECK(waiting_for_collect_final_metrics_step_);
 498
 499   // Create a callback_task for OnHistogramSynchronizationDone.
 500   base::Closure callback = base::Bind(
 501       &ChromeMetricsServiceClient::OnHistogramSynchronizationDone,
 502       weak_ptr_factory_.GetWeakPtr());
 503
 504   base::TimeDelta timeout =
 505       base::TimeDelta::FromMilliseconds(kMaxHistogramGatheringWaitDuration);
 506
 507   DCHECK_EQ(num_async_histogram_fetches_in_progress_, 0);
 508
 509 #if !defined(ENABLE_PRINT_PREVIEW)
 510   num_async_histogram_fetches_in_progress_ = 1;
 511 #else   // !ENABLE_PRINT_PREVIEW
 512   num_async_histogram_fetches_in_progress_ = 2;
 513   // Run requests to service and content in parallel.
 514   if (!ServiceProcessControl::GetInstance()->GetHistograms(callback, timeout)) {
 515     // Assume |num_async_histogram_fetches_in_progress_| is not changed by
 516     // |GetHistograms()|.
 517     DCHECK_EQ(num_async_histogram_fetches_in_progress_, 2);
 518     // Assign |num_async_histogram_fetches_in_progress_| above and decrement it
 519     // here to make code work even if |GetHistograms()| fired |callback|.
 520     --num_async_histogram_fetches_in_progress_;
 521   }
 522 #endif  // !ENABLE_PRINT_PREVIEW
 523
 524   // Set up the callback to task to call after we receive histograms from all
 525   // child processes. |timeout| specifies how long to wait before absolutely
 526   // calling us back on the task.
 527   content::FetchHistogramsAsynchronously(base::MessageLoop::current(), callback,
 528                                          timeout);
 529 }
 530
 531 void ChromeMetricsServiceClient::OnHistogramSynchronizationDone() {
 532   DCHECK(thread_checker_.CalledOnValidThread());
 533
 534   // This function should only be called as the callback from an ansynchronous
 535   // step.
 536   DCHECK(waiting_for_collect_final_metrics_step_);
 537   DCHECK_GT(num_async_histogram_fetches_in_progress_, 0);
 538
 539   // Check if all expected requests finished.
 540   if (--num_async_histogram_fetches_in_progress_ > 0)
 541     return;
 542
 543   waiting_for_collect_final_metrics_step_ = false;
 544   collect_final_metrics_done_callback_.Run();
 545 }
 546
 547 void ChromeMetricsServiceClient::RecordCommandLineMetrics() {
 548   // Get stats on use of command line.
 549   const base::CommandLine* command_line(base::CommandLine::ForCurrentProcess());
 550   size_t common_commands = 0;
 551   if (command_line->HasSwitch(switches::kUserDataDir)) {
 552     ++common_commands;
 553     UMA_HISTOGRAM_COUNTS_100("Chrome.CommandLineDatDirCount", 1);
 554   }
 555
 556   if (command_line->HasSwitch(switches::kApp)) {
 557     ++common_commands;
 558     UMA_HISTOGRAM_COUNTS_100("Chrome.CommandLineAppModeCount", 1);
 559   }
 560
 561   // TODO(rohitrao): Should these be logged on iOS as well?
 562   // http://crbug.com/375794
 563   size_t switch_count = command_line->GetSwitches().size();
 564   UMA_HISTOGRAM_COUNTS_100("Chrome.CommandLineFlagCount", switch_count);
 565   UMA_HISTOGRAM_COUNTS_100("Chrome.CommandLineUncommonFlagCount",
 566                            switch_count - common_commands);
 567 }
 568
 569 void ChromeMetricsServiceClient::RegisterForNotifications() {
 570   registrar_.Add(this, chrome::NOTIFICATION_BROWSER_OPENED,
 571                  content::NotificationService::AllBrowserContextsAndSources());
 572   registrar_.Add(this, chrome::NOTIFICATION_BROWSER_CLOSED,
 573                  content::NotificationService::AllSources());
 574   registrar_.Add(this, chrome::NOTIFICATION_TAB_PARENTED,
 575                  content::NotificationService::AllSources());
 576   registrar_.Add(this, chrome::NOTIFICATION_TAB_CLOSING,
 577                  content::NotificationService::AllSources());
 578   registrar_.Add(this, content::NOTIFICATION_LOAD_START,
 579                  content::NotificationService::AllSources());
 580   registrar_.Add(this, content::NOTIFICATION_LOAD_STOP,
 581                  content::NotificationService::AllSources());
 582   registrar_.Add(this, content::NOTIFICATION_RENDERER_PROCESS_CLOSED,
 583                  content::NotificationService::AllSources());
 584   registrar_.Add(this, content::NOTIFICATION_RENDER_WIDGET_HOST_HANG,
 585                  content::NotificationService::AllSources());
 586
 587   omnibox_url_opened_subscription_ =
 588       OmniboxEventGlobalTracker::GetInstance()->RegisterCallback(
 589           base::Bind(&ChromeMetricsServiceClient::OnURLOpenedFromOmnibox,
 590                      base::Unretained(this)));
 591 }
 592
 593 void ChromeMetricsServiceClient::Observe(
 594     int type,
 595     const content::NotificationSource& source,
 596     const content::NotificationDetails& details) {
 597   DCHECK(thread_checker_.CalledOnValidThread());
 598
 599   switch (type) {
 600     case chrome::NOTIFICATION_BROWSER_OPENED:
 601     case chrome::NOTIFICATION_BROWSER_CLOSED:
 602     case chrome::NOTIFICATION_TAB_PARENTED:
 603     case chrome::NOTIFICATION_TAB_CLOSING:
 604     case content::NOTIFICATION_LOAD_STOP:
 605     case content::NOTIFICATION_LOAD_START:
 606     case content::NOTIFICATION_RENDERER_PROCESS_CLOSED:
 607     case content::NOTIFICATION_RENDER_WIDGET_HOST_HANG:
 608       metrics_service_->OnApplicationNotIdle();
 609       break;
 610
 611     default:
 612       NOTREACHED();
 613   }
 614 }
 615
 616 void ChromeMetricsServiceClient::OnURLOpenedFromOmnibox(OmniboxLog* log) {
 617   metrics_service_->OnApplicationNotIdle();
 618 }