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/strings/string16.h"
  18 #include "base/threading/platform_thread.h"
  19 #include "chrome/browser/browser_process.h"
  20 #include "chrome/browser/chrome_notification_types.h"
  21 #include "chrome/browser/google/google_brand.h"
  22 #include "chrome/browser/metrics/chrome_stability_metrics_provider.h"
  23 #include "chrome/browser/metrics/omnibox_metrics_provider.h"
  24 #include "chrome/browser/metrics/time_ticks_experiment_win.h"
  25 #include "chrome/browser/process_resource_usage.h"
  26 #include "chrome/browser/ui/browser_otr_state.h"
  27 #include "chrome/common/channel_info.h"
  28 #include "chrome/common/chrome_constants.h"
  29 #include "chrome/common/chrome_paths.h"
  30 #include "chrome/common/chrome_switches.h"
  31 #include "chrome/common/crash_keys.h"
  32 #include "chrome/common/metrics/version_utils.h"
  33 #include "chrome/common/pref_names.h"
  34 #include "components/metrics/call_stack_profile_metrics_provider.h"
  35 #include "components/metrics/drive_metrics_provider.h"
  36 #include "components/metrics/gpu/gpu_metrics_provider.h"
  37 #include "components/metrics/metrics_service.h"
  38 #include "components/metrics/net/net_metrics_log_uploader.h"
  39 #include "components/metrics/net/network_metrics_provider.h"
  40 #include "components/metrics/profiler/profiler_metrics_provider.h"
  41 #include "components/metrics/profiler/tracking_synchronizer.h"
  42 #include "components/metrics/url_constants.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 #include "content/public/browser/render_process_host.h"
  49 #include "content/public/common/service_registry.h"
  50
  51 #if defined(OS_ANDROID)
  52 #include "chrome/browser/metrics/android_metrics_provider.h"
  53 #endif
  54
  55 #if defined(ENABLE_PRINT_PREVIEW)
  56 #include "chrome/browser/service_process/service_process_control.h"
  57 #endif
  58
  59 #if defined(ENABLE_EXTENSIONS)
  60 #include "chrome/browser/metrics/extensions_metrics_provider.h"
  61 #endif
  62
  63 #if defined(ENABLE_PLUGINS)
  64 #include "chrome/browser/metrics/plugin_metrics_provider.h"
  65 #endif
  66
  67 #if defined(OS_CHROMEOS)
  68 #include "chrome/browser/metrics/chromeos_metrics_provider.h"
  69 #include "chrome/browser/metrics/signin_status_metrics_provider_chromeos.h"
  70 #endif
  71
  72 #if defined(OS_WIN)
  73 #include <windows.h>
  74 #include "chrome/browser/metrics/google_update_metrics_provider_win.h"
  75 #include "components/browser_watcher/watcher_metrics_provider_win.h"
  76 #endif
  77
  78 #if !defined(OS_CHROMEOS)
  79 #include "chrome/browser/metrics/signin_status_metrics_provider.h"
  80 #endif  // !defined(OS_CHROMEOS)
  81
  82 namespace {
  83
  84 // This specifies the amount of time to wait for all renderers to send their
  85 // data.
  86 const int kMaxHistogramGatheringWaitDuration = 60000;  // 60 seconds.
  87
  88 // Standard interval between log uploads, in seconds.
  89 #if defined(OS_ANDROID) || defined(OS_IOS)
  90 const int kStandardUploadIntervalSeconds = 5 * 60;  // Five minutes.
  91 const int kStandardUploadIntervalCellularSeconds = 15 * 60;  // Fifteen minutes.
  92 #else
  93 const int kStandardUploadIntervalSeconds = 30 * 60;  // Thirty minutes.
  94 #endif
  95
  96 // Returns true if current connection type is cellular and user is assigned to
  97 // experimental group for enabled cellular uploads.
  98 bool IsCellularLogicEnabled() {
  99   if (variations::GetVariationParamValue("UMA_EnableCellularLogUpload",
 100                                          "Enabled") != "true" ||
 101       variations::GetVariationParamValue("UMA_EnableCellularLogUpload",
 102                                          "Optimize") == "false") {
 103     return false;
 104   }
 105
 106   return net::NetworkChangeNotifier::IsConnectionCellular(
 107       net::NetworkChangeNotifier::GetConnectionType());
 108 }
 109
 110 // Checks whether it is the first time that cellular uploads logic should be
 111 // enabled based on whether the the preference for that logic is initialized.
 112 // This should happen only once as the used preference will be initialized
 113 // afterwards in |UmaSessionStats.java|.
 114 bool ShouldClearSavedMetrics() {
 115 #if defined(OS_ANDROID)
 116   PrefService* local_state = g_browser_process->local_state();
 117   return !local_state->HasPrefPath(prefs::kMetricsReportingEnabled) &&
 118          variations::GetVariationParamValue("UMA_EnableCellularLogUpload",
 119                                             "Enabled") == "true";
 120 #else
 121   return false;
 122 #endif
 123 }
 124
 125 }  // namespace
 126
 127
 128 ChromeMetricsServiceClient::ChromeMetricsServiceClient(
 129     metrics::MetricsStateManager* state_manager)
 130     : metrics_state_manager_(state_manager),
 131       chromeos_metrics_provider_(nullptr),
 132       waiting_for_collect_final_metrics_step_(false),
 133       num_async_histogram_fetches_in_progress_(0),
 134       profiler_metrics_provider_(nullptr),
 135 #if defined(ENABLE_PLUGINS)
 136       plugin_metrics_provider_(nullptr),
 137 #endif
 138 #if defined(OS_WIN)
 139       google_update_metrics_provider_(nullptr),
 140 #endif
 141       drive_metrics_provider_(nullptr),
 142       start_time_(base::TimeTicks::Now()),
 143       weak_ptr_factory_(this) {
 144   DCHECK(thread_checker_.CalledOnValidThread());
 145   RecordCommandLineMetrics();
 146   RegisterForNotifications();
 147 }
 148
 149 ChromeMetricsServiceClient::~ChromeMetricsServiceClient() {
 150   DCHECK(thread_checker_.CalledOnValidThread());
 151 }
 152
 153 // static
 154 scoped_ptr<ChromeMetricsServiceClient> ChromeMetricsServiceClient::Create(
 155     metrics::MetricsStateManager* state_manager,
 156     PrefService* local_state) {
 157   // Perform two-phase initialization so that |client->metrics_service_| only
 158   // receives pointers to fully constructed objects.
 159   scoped_ptr<ChromeMetricsServiceClient> client(
 160       new ChromeMetricsServiceClient(state_manager));
 161   client->Initialize();
 162
 163   return client.Pass();
 164 }
 165
 166 // static
 167 void ChromeMetricsServiceClient::RegisterPrefs(PrefRegistrySimple* registry) {
 168   registry->RegisterInt64Pref(prefs::kUninstallLastLaunchTimeSec, 0);
 169   registry->RegisterInt64Pref(prefs::kUninstallLastObservedRunTimeSec, 0);
 170
 171   metrics::MetricsService::RegisterPrefs(registry);
 172   ChromeStabilityMetricsProvider::RegisterPrefs(registry);
 173
 174 #if defined(OS_ANDROID)
 175   AndroidMetricsProvider::RegisterPrefs(registry);
 176 #endif  // defined(OS_ANDROID)
 177
 178 #if defined(ENABLE_PLUGINS)
 179   PluginMetricsProvider::RegisterPrefs(registry);
 180 #endif  // defined(ENABLE_PLUGINS)
 181 }
 182
 183 void ChromeMetricsServiceClient::SetMetricsClientId(
 184     const std::string& client_id) {
 185   crash_keys::SetMetricsClientIdFromGUID(client_id);
 186 }
 187
 188 void ChromeMetricsServiceClient::OnRecordingDisabled() {
 189   crash_keys::ClearMetricsClientId();
 190 }
 191
 192 bool ChromeMetricsServiceClient::IsOffTheRecordSessionActive() {
 193   return chrome::IsOffTheRecordSessionActive();
 194 }
 195
 196 int32 ChromeMetricsServiceClient::GetProduct() {
 197   return metrics::ChromeUserMetricsExtension::CHROME;
 198 }
 199
 200 std::string ChromeMetricsServiceClient::GetApplicationLocale() {
 201   return g_browser_process->GetApplicationLocale();
 202 }
 203
 204 bool ChromeMetricsServiceClient::GetBrand(std::string* brand_code) {
 205   return google_brand::GetBrand(brand_code);
 206 }
 207
 208 metrics::SystemProfileProto::Channel ChromeMetricsServiceClient::GetChannel() {
 209   return metrics::AsProtobufChannel(chrome::GetChannel());
 210 }
 211
 212 std::string ChromeMetricsServiceClient::GetVersionString() {
 213   return metrics::GetVersionString();
 214 }
 215
 216 void ChromeMetricsServiceClient::OnLogUploadComplete() {
 217   // Collect time ticks stats after each UMA upload.
 218 #if defined(OS_WIN)
 219   chrome::CollectTimeTicksStats();
 220 #endif
 221 }
 222
 223 void ChromeMetricsServiceClient::StartGatheringMetrics(
 224     const base::Closure& done_callback) {
 225   finished_gathering_initial_metrics_callback_ = done_callback;
 226   base::Closure got_hardware_class_callback =
 227       base::Bind(&ChromeMetricsServiceClient::OnInitTaskGotHardwareClass,
 228                  weak_ptr_factory_.GetWeakPtr());
 229 #if defined(OS_CHROMEOS)
 230   chromeos_metrics_provider_->InitTaskGetHardwareClass(
 231       got_hardware_class_callback);
 232 #else
 233   got_hardware_class_callback.Run();
 234 #endif  // defined(OS_CHROMEOS)
 235 }
 236
 237 void ChromeMetricsServiceClient::CollectFinalMetrics(
 238     const base::Closure& done_callback) {
 239   DCHECK(thread_checker_.CalledOnValidThread());
 240
 241   collect_final_metrics_done_callback_ = done_callback;
 242
 243   // Begin the multi-step process of collecting memory usage histograms:
 244   // First spawn a task to collect the memory details; when that task is
 245   // finished, it will call OnMemoryDetailCollectionDone. That will in turn
 246   // call HistogramSynchronization to collect histograms from all renderers and
 247   // then call OnHistogramSynchronizationDone to continue processing.
 248   DCHECK(!waiting_for_collect_final_metrics_step_);
 249   waiting_for_collect_final_metrics_step_ = true;
 250
 251   base::Closure callback =
 252       base::Bind(&ChromeMetricsServiceClient::OnMemoryDetailCollectionDone,
 253                  weak_ptr_factory_.GetWeakPtr());
 254
 255   scoped_refptr<MetricsMemoryDetails> details(
 256       new MetricsMemoryDetails(callback, &memory_growth_tracker_));
 257   details->StartFetch(MemoryDetails::FROM_CHROME_ONLY);
 258
 259   base::ScopedPtrMap<int, scoped_ptr<ProcessResourceUsage>> current_map;
 260   host_resource_usage_map_.swap(current_map);
 261
 262   // Collect WebCore cache information to put into a histogram.
 263   for (content::RenderProcessHost::iterator i(
 264           content::RenderProcessHost::AllHostsIterator());
 265        !i.IsAtEnd(); i.Advance()) {
 266     content::RenderProcessHost* host = i.GetCurrentValue();
 267     int host_id = host->GetID();
 268     ProcessResourceUsage* resource_usage = nullptr;
 269     auto iter = current_map.find(host_id);
 270     if (iter != current_map.end()) {
 271       resource_usage = iter->second;
 272       host_resource_usage_map_.set(host_id, current_map.take_and_erase(iter));
 273     } else {
 274       content::ServiceRegistry* service_registry = host->GetServiceRegistry();
 275       if (service_registry) {
 276         ResourceUsageReporterPtr service;
 277         service_registry->ConnectToRemoteService(mojo::GetProxy(&service));
 278         resource_usage = new ProcessResourceUsage(service.Pass());
 279         host_resource_usage_map_.set(host_id, make_scoped_ptr(resource_usage));
 280       }
 281     }
 282     if (resource_usage) {
 283       resource_usage->Refresh(
 284           base::Bind(&ChromeMetricsServiceClient::OnWebCacheStatsRefresh,
 285                      weak_ptr_factory_.GetWeakPtr(), host_id));
 286     }
 287   }
 288 }
 289
 290 scoped_ptr<metrics::MetricsLogUploader>
 291 ChromeMetricsServiceClient::CreateUploader(
 292     const base::Callback<void(int)>& on_upload_complete) {
 293   return scoped_ptr<metrics::MetricsLogUploader>(
 294       new metrics::NetMetricsLogUploader(
 295           g_browser_process->system_request_context(),
 296           metrics::kDefaultMetricsServerUrl,
 297           metrics::kDefaultMetricsMimeType,
 298           on_upload_complete));
 299 }
 300
 301 base::TimeDelta ChromeMetricsServiceClient::GetStandardUploadInterval() {
 302 #if defined(OS_ANDROID) || defined(OS_IOS)
 303   if (IsCellularLogicEnabled())
 304     return base::TimeDelta::FromSeconds(kStandardUploadIntervalCellularSeconds);
 305 #endif
 306   return base::TimeDelta::FromSeconds(kStandardUploadIntervalSeconds);
 307 }
 308
 309 base::string16 ChromeMetricsServiceClient::GetRegistryBackupKey() {
 310 #if defined(OS_WIN)
 311   return L"Software\\" PRODUCT_STRING_PATH L"\\StabilityMetrics";
 312 #else
 313   return base::string16();
 314 #endif
 315 }
 316
 317 void ChromeMetricsServiceClient::LogPluginLoadingError(
 318     const base::FilePath& plugin_path) {
 319 #if defined(ENABLE_PLUGINS)
 320   plugin_metrics_provider_->LogPluginLoadingError(plugin_path);
 321 #else
 322   NOTREACHED();
 323 #endif  // defined(ENABLE_PLUGINS)
 324 }
 325
 326 void ChromeMetricsServiceClient::Initialize() {
 327   // Clear metrics reports if it is the first time cellular upload logic should
 328   // apply to avoid sudden bulk uploads. It needs to be done before initializing
 329   // metrics service so that metrics log manager is initialized correctly.
 330   if (ShouldClearSavedMetrics()) {
 331     PrefService* local_state = g_browser_process->local_state();
 332     local_state->ClearPref(metrics::prefs::kMetricsInitialLogs);
 333     local_state->ClearPref(metrics::prefs::kMetricsOngoingLogs);
 334   }
 335
 336   metrics_service_.reset(new metrics::MetricsService(
 337       metrics_state_manager_, this, g_browser_process->local_state()));
 338
 339   // Register metrics providers.
 340 #if defined(ENABLE_EXTENSIONS)
 341   metrics_service_->RegisterMetricsProvider(
 342       scoped_ptr<metrics::MetricsProvider>(
 343           new ExtensionsMetricsProvider(metrics_state_manager_)));
 344 #endif
 345   metrics_service_->RegisterMetricsProvider(
 346       scoped_ptr<metrics::MetricsProvider>(new metrics::NetworkMetricsProvider(
 347           content::BrowserThread::GetBlockingPool())));
 348
 349   metrics_service_->RegisterMetricsProvider(
 350       scoped_ptr<metrics::MetricsProvider>(new OmniboxMetricsProvider));
 351   metrics_service_->RegisterMetricsProvider(
 352       scoped_ptr<metrics::MetricsProvider>(new ChromeStabilityMetricsProvider));
 353   metrics_service_->RegisterMetricsProvider(
 354       scoped_ptr<metrics::MetricsProvider>(new metrics::GPUMetricsProvider));
 355
 356   drive_metrics_provider_ = new metrics::DriveMetricsProvider(
 357       content::BrowserThread::GetMessageLoopProxyForThread(
 358           content::BrowserThread::FILE),
 359       chrome::FILE_LOCAL_STATE);
 360   metrics_service_->RegisterMetricsProvider(
 361       scoped_ptr<metrics::MetricsProvider>(drive_metrics_provider_));
 362
 363   profiler_metrics_provider_ =
 364       new metrics::ProfilerMetricsProvider(base::Bind(&IsCellularLogicEnabled));
 365   metrics_service_->RegisterMetricsProvider(
 366       scoped_ptr<metrics::MetricsProvider>(profiler_metrics_provider_));
 367
 368   metrics_service_->RegisterMetricsProvider(
 369       scoped_ptr<metrics::MetricsProvider>(
 370           new metrics::CallStackProfileMetricsProvider));
 371
 372 #if defined(OS_ANDROID)
 373   metrics_service_->RegisterMetricsProvider(
 374       scoped_ptr<metrics::MetricsProvider>(
 375           new AndroidMetricsProvider(g_browser_process->local_state())));
 376 #endif  // defined(OS_ANDROID)
 377
 378 #if defined(OS_WIN)
 379   google_update_metrics_provider_ = new GoogleUpdateMetricsProviderWin;
 380   metrics_service_->RegisterMetricsProvider(
 381       scoped_ptr<metrics::MetricsProvider>(google_update_metrics_provider_));
 382
 383   // Report exit funnels for canary and dev only.
 384   bool report_exit_funnels = false;
 385   switch (chrome::GetChannel()) {
 386     case version_info::Channel::CANARY:
 387     case version_info::Channel::DEV:
 388       report_exit_funnels = true;
 389       break;
 390   }
 391
 392   metrics_service_->RegisterMetricsProvider(
 393       scoped_ptr<metrics::MetricsProvider>(
 394           new browser_watcher::WatcherMetricsProviderWin(
 395               chrome::kBrowserExitCodesRegistryPath, report_exit_funnels)));
 396 #endif  // defined(OS_WIN)
 397
 398 #if defined(ENABLE_PLUGINS)
 399   plugin_metrics_provider_ =
 400       new PluginMetricsProvider(g_browser_process->local_state());
 401   metrics_service_->RegisterMetricsProvider(
 402       scoped_ptr<metrics::MetricsProvider>(plugin_metrics_provider_));
 403 #endif  // defined(ENABLE_PLUGINS)
 404
 405 #if defined(OS_CHROMEOS)
 406   ChromeOSMetricsProvider* chromeos_metrics_provider =
 407       new ChromeOSMetricsProvider;
 408   chromeos_metrics_provider_ = chromeos_metrics_provider;
 409   metrics_service_->RegisterMetricsProvider(
 410       scoped_ptr<metrics::MetricsProvider>(chromeos_metrics_provider));
 411
 412   SigninStatusMetricsProviderChromeOS* signin_metrics_provider_cros =
 413       new SigninStatusMetricsProviderChromeOS;
 414   metrics_service_->RegisterMetricsProvider(
 415       scoped_ptr<metrics::MetricsProvider>(signin_metrics_provider_cros));
 416 #endif  // defined(OS_CHROMEOS)
 417
 418 #if !defined(OS_CHROMEOS)
 419   metrics_service_->RegisterMetricsProvider(
 420       scoped_ptr<metrics::MetricsProvider>(
 421           SigninStatusMetricsProvider::CreateInstance()));
 422 #endif  // !defined(OS_CHROMEOS)
 423
 424   // Clear stability metrics if it is the first time cellular upload logic
 425   // should apply to avoid sudden bulk uploads. It needs to be done after all
 426   // providers are registered.
 427   if (ShouldClearSavedMetrics())
 428     metrics_service_->ClearSavedStabilityMetrics();
 429 }
 430
 431 void ChromeMetricsServiceClient::OnInitTaskGotHardwareClass() {
 432   const base::Closure got_plugin_info_callback =
 433       base::Bind(&ChromeMetricsServiceClient::OnInitTaskGotPluginInfo,
 434                  weak_ptr_factory_.GetWeakPtr());
 435
 436 #if defined(ENABLE_PLUGINS)
 437   plugin_metrics_provider_->GetPluginInformation(got_plugin_info_callback);
 438 #else
 439   got_plugin_info_callback.Run();
 440 #endif  // defined(ENABLE_PLUGINS)
 441 }
 442
 443 void ChromeMetricsServiceClient::OnInitTaskGotPluginInfo() {
 444   const base::Closure got_metrics_callback =
 445       base::Bind(&ChromeMetricsServiceClient::OnInitTaskGotGoogleUpdateData,
 446                  weak_ptr_factory_.GetWeakPtr());
 447
 448 #if defined(OS_WIN) && defined(GOOGLE_CHROME_BUILD)
 449   google_update_metrics_provider_->GetGoogleUpdateData(got_metrics_callback);
 450 #else
 451   got_metrics_callback.Run();
 452 #endif  // defined(OS_WIN) && defined(GOOGLE_CHROME_BUILD)
 453 }
 454
 455 void ChromeMetricsServiceClient::OnInitTaskGotGoogleUpdateData() {
 456   // Start the next part of the init task: fetching performance data.  This will
 457   // call into |FinishedReceivingProfilerData()| when the task completes.
 458   metrics::TrackingSynchronizer::FetchProfilerDataAsynchronously(
 459       weak_ptr_factory_.GetWeakPtr());
 460 }
 461
 462 void ChromeMetricsServiceClient::OnWebCacheStatsRefresh(int host_id) {
 463   DCHECK(thread_checker_.CalledOnValidThread());
 464
 465   auto iter = host_resource_usage_map_.find(host_id);
 466   if (iter != host_resource_usage_map_.end()) {
 467     blink::WebCache::ResourceTypeStats stats =
 468         iter->second->GetWebCoreCacheStats();
 469     LOCAL_HISTOGRAM_COUNTS("WebCoreCache.ImagesSizeKB",
 470                            static_cast<int>(stats.images.size / 1024));
 471     LOCAL_HISTOGRAM_COUNTS("WebCoreCache.CSSStylesheetsSizeKB",
 472                            static_cast<int>(stats.cssStyleSheets.size / 1024));
 473     LOCAL_HISTOGRAM_COUNTS("WebCoreCache.ScriptsSizeKB",
 474                            static_cast<int>(stats.scripts.size / 1024));
 475     LOCAL_HISTOGRAM_COUNTS("WebCoreCache.XSLStylesheetsSizeKB",
 476                            static_cast<int>(stats.xslStyleSheets.size / 1024));
 477     LOCAL_HISTOGRAM_COUNTS("WebCoreCache.FontsSizeKB",
 478                            static_cast<int>(stats.fonts.size / 1024));
 479   }
 480 }
 481
 482 void ChromeMetricsServiceClient::ReceivedProfilerData(
 483     const metrics::ProfilerDataAttributes& attributes,
 484     const tracked_objects::ProcessDataPhaseSnapshot& process_data_phase,
 485     const metrics::ProfilerEvents& past_events) {
 486   profiler_metrics_provider_->RecordProfilerData(
 487       process_data_phase, attributes.process_id, attributes.process_type,
 488       attributes.profiling_phase, attributes.phase_start - start_time_,
 489       attributes.phase_finish - start_time_, past_events);
 490 }
 491
 492 void ChromeMetricsServiceClient::FinishedReceivingProfilerData() {
 493   drive_metrics_provider_->GetDriveMetrics(
 494       finished_gathering_initial_metrics_callback_);
 495 }
 496
 497 void ChromeMetricsServiceClient::OnMemoryDetailCollectionDone() {
 498   DCHECK(thread_checker_.CalledOnValidThread());
 499
 500   // This function should only be called as the callback from an ansynchronous
 501   // step.
 502   DCHECK(waiting_for_collect_final_metrics_step_);
 503
 504   // Create a callback_task for OnHistogramSynchronizationDone.
 505   base::Closure callback = base::Bind(
 506       &ChromeMetricsServiceClient::OnHistogramSynchronizationDone,
 507       weak_ptr_factory_.GetWeakPtr());
 508
 509   base::TimeDelta timeout =
 510       base::TimeDelta::FromMilliseconds(kMaxHistogramGatheringWaitDuration);
 511
 512   DCHECK_EQ(num_async_histogram_fetches_in_progress_, 0);
 513
 514 #if !defined(ENABLE_PRINT_PREVIEW)
 515   num_async_histogram_fetches_in_progress_ = 1;
 516 #else   // !ENABLE_PRINT_PREVIEW
 517   num_async_histogram_fetches_in_progress_ = 2;
 518   // Run requests to service and content in parallel.
 519   if (!ServiceProcessControl::GetInstance()->GetHistograms(callback, timeout)) {
 520     // Assume |num_async_histogram_fetches_in_progress_| is not changed by
 521     // |GetHistograms()|.
 522     DCHECK_EQ(num_async_histogram_fetches_in_progress_, 2);
 523     // Assign |num_async_histogram_fetches_in_progress_| above and decrement it
 524     // here to make code work even if |GetHistograms()| fired |callback|.
 525     --num_async_histogram_fetches_in_progress_;
 526   }
 527 #endif  // !ENABLE_PRINT_PREVIEW
 528
 529   // Set up the callback to task to call after we receive histograms from all
 530   // child processes. |timeout| specifies how long to wait before absolutely
 531   // calling us back on the task.
 532   content::FetchHistogramsAsynchronously(base::MessageLoop::current(), callback,
 533                                          timeout);
 534 }
 535
 536 void ChromeMetricsServiceClient::OnHistogramSynchronizationDone() {
 537   DCHECK(thread_checker_.CalledOnValidThread());
 538
 539   // This function should only be called as the callback from an ansynchronous
 540   // step.
 541   DCHECK(waiting_for_collect_final_metrics_step_);
 542   DCHECK_GT(num_async_histogram_fetches_in_progress_, 0);
 543
 544   // Check if all expected requests finished.
 545   if (--num_async_histogram_fetches_in_progress_ > 0)
 546     return;
 547
 548   waiting_for_collect_final_metrics_step_ = false;
 549   collect_final_metrics_done_callback_.Run();
 550 }
 551
 552 void ChromeMetricsServiceClient::RecordCommandLineMetrics() {
 553   // Get stats on use of command line.
 554   const base::CommandLine* command_line(base::CommandLine::ForCurrentProcess());
 555   size_t common_commands = 0;
 556   if (command_line->HasSwitch(switches::kUserDataDir)) {
 557     ++common_commands;
 558     UMA_HISTOGRAM_COUNTS_100("Chrome.CommandLineDatDirCount", 1);
 559   }
 560
 561   if (command_line->HasSwitch(switches::kApp)) {
 562     ++common_commands;
 563     UMA_HISTOGRAM_COUNTS_100("Chrome.CommandLineAppModeCount", 1);
 564   }
 565
 566   // TODO(rohitrao): Should these be logged on iOS as well?
 567   // http://crbug.com/375794
 568   size_t switch_count = command_line->GetSwitches().size();
 569   UMA_HISTOGRAM_COUNTS_100("Chrome.CommandLineFlagCount", switch_count);
 570   UMA_HISTOGRAM_COUNTS_100("Chrome.CommandLineUncommonFlagCount",
 571                            switch_count - common_commands);
 572 }
 573
 574 void ChromeMetricsServiceClient::RegisterForNotifications() {
 575   registrar_.Add(this, chrome::NOTIFICATION_BROWSER_OPENED,
 576                  content::NotificationService::AllBrowserContextsAndSources());
 577   registrar_.Add(this, chrome::NOTIFICATION_BROWSER_CLOSED,
 578                  content::NotificationService::AllSources());
 579   registrar_.Add(this, chrome::NOTIFICATION_TAB_PARENTED,
 580                  content::NotificationService::AllSources());
 581   registrar_.Add(this, chrome::NOTIFICATION_TAB_CLOSING,
 582                  content::NotificationService::AllSources());
 583   registrar_.Add(this, content::NOTIFICATION_LOAD_START,
 584                  content::NotificationService::AllSources());
 585   registrar_.Add(this, content::NOTIFICATION_LOAD_STOP,
 586                  content::NotificationService::AllSources());
 587   registrar_.Add(this, content::NOTIFICATION_RENDERER_PROCESS_CLOSED,
 588                  content::NotificationService::AllSources());
 589   registrar_.Add(this, content::NOTIFICATION_RENDER_WIDGET_HOST_HANG,
 590                  content::NotificationService::AllSources());
 591   registrar_.Add(this, chrome::NOTIFICATION_OMNIBOX_OPENED_URL,
 592                  content::NotificationService::AllSources());
 593 }
 594
 595 void ChromeMetricsServiceClient::Observe(
 596     int type,
 597     const content::NotificationSource& source,
 598     const content::NotificationDetails& details) {
 599   DCHECK(thread_checker_.CalledOnValidThread());
 600
 601   switch (type) {
 602     case chrome::NOTIFICATION_BROWSER_OPENED:
 603     case chrome::NOTIFICATION_BROWSER_CLOSED:
 604     case chrome::NOTIFICATION_OMNIBOX_OPENED_URL:
 605     case chrome::NOTIFICATION_TAB_PARENTED:
 606     case chrome::NOTIFICATION_TAB_CLOSING:
 607     case content::NOTIFICATION_LOAD_STOP:
 608     case content::NOTIFICATION_LOAD_START:
 609     case content::NOTIFICATION_RENDERER_PROCESS_CLOSED:
 610     case content::NOTIFICATION_RENDER_WIDGET_HOST_HANG:
 611       metrics_service_->OnApplicationNotIdle();
 612       break;
 613
 614     default:
 615       NOTREACHED();
 616   }
 617 }