chrome/browser/rlz/rlz.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 // This code glues the RLZ library DLL with Chrome. It allows Chrome to work
   6 // with or without the DLL being present. If the DLL is not present the
   7 // functions do nothing and just return false.
   8
   9 #include "chrome/browser/rlz/rlz.h"
  10
  11 #include <algorithm>
  12
  13 #include "base/bind.h"
  14 #include "base/command_line.h"
  15 #include "base/debug/trace_event.h"
  16 #include "base/message_loop/message_loop.h"
  17 #include "base/prefs/pref_service.h"
  18 #include "base/strings/string_util.h"
  19 #include "base/strings/utf_string_conversions.h"
  20 #include "chrome/browser/browser_process.h"
  21 #include "chrome/browser/chrome_notification_types.h"
  22 #include "chrome/browser/google/google_util.h"
  23 #include "chrome/browser/prefs/session_startup_pref.h"
  24 #include "chrome/browser/search_engines/template_url.h"
  25 #include "chrome/browser/search_engines/template_url_service.h"
  26 #include "chrome/browser/search_engines/template_url_service_factory.h"
  27 #include "chrome/browser/ui/startup/startup_browser_creator.h"
  28 #include "chrome/common/chrome_switches.h"
  29 #include "chrome/common/pref_names.h"
  30 #include "content/public/browser/browser_thread.h"
  31 #include "content/public/browser/navigation_entry.h"
  32 #include "content/public/browser/notification_service.h"
  33 #include "net/http/http_util.h"
  34
  35 #if defined(OS_WIN)
  36 #include "chrome/installer/util/google_update_settings.h"
  37 #else
  38 namespace GoogleUpdateSettings {
  39 static bool GetLanguage(string16* language) {
  40   // TODO(thakis): Implement.
  41   NOTIMPLEMENTED();
  42   return false;
  43 }
  44
  45 // The referral program is defunct and not used. No need to implement these
  46 // functions on non-Win platforms.
  47 static bool GetReferral(string16* referral) {
  48   return true;
  49 }
  50 static bool ClearReferral() {
  51   return true;
  52 }
  53 }  // namespace GoogleUpdateSettings
  54 #endif
  55
  56 using content::BrowserThread;
  57 using content::NavigationEntry;
  58
  59 namespace {
  60
  61 // Maximum and minimum delay for financial ping we would allow to be set through
  62 // master preferences. Somewhat arbitrary, may need to be adjusted in future.
  63 const base::TimeDelta kMaxInitDelay = base::TimeDelta::FromSeconds(200);
  64 const base::TimeDelta kMinInitDelay = base::TimeDelta::FromSeconds(20);
  65
  66 bool IsBrandOrganic(const std::string& brand) {
  67   return brand.empty() || google_util::IsOrganic(brand);
  68 }
  69
  70 void RecordProductEvents(bool first_run,
  71                          bool is_google_default_search,
  72                          bool is_google_homepage,
  73                          bool is_google_in_startpages,
  74                          bool already_ran,
  75                          bool omnibox_used,
  76                          bool homepage_used) {
  77   TRACE_EVENT0("RLZ", "RecordProductEvents");
  78   // Record the installation of chrome. We call this all the time but the rlz
  79   // lib should ignore all but the first one.
  80   rlz_lib::RecordProductEvent(rlz_lib::CHROME,
  81                               RLZTracker::CHROME_OMNIBOX,
  82                               rlz_lib::INSTALL);
  83   rlz_lib::RecordProductEvent(rlz_lib::CHROME,
  84                               RLZTracker::CHROME_HOME_PAGE,
  85                               rlz_lib::INSTALL);
  86
  87   if (!already_ran) {
  88     // Do the initial event recording if is the first run or if we have an
  89     // empty rlz which means we haven't got a chance to do it.
  90     char omnibox_rlz[rlz_lib::kMaxRlzLength + 1];
  91     if (!rlz_lib::GetAccessPointRlz(RLZTracker::CHROME_OMNIBOX, omnibox_rlz,
  92                                     rlz_lib::kMaxRlzLength)) {
  93       omnibox_rlz[0] = 0;
  94     }
  95
  96     // Record if google is the initial search provider and/or home page.
  97     if ((first_run || omnibox_rlz[0] == 0) && is_google_default_search) {
  98       rlz_lib::RecordProductEvent(rlz_lib::CHROME,
  99                                   RLZTracker::CHROME_OMNIBOX,
 100                                   rlz_lib::SET_TO_GOOGLE);
 101     }
 102
 103     char homepage_rlz[rlz_lib::kMaxRlzLength + 1];
 104     if (!rlz_lib::GetAccessPointRlz(RLZTracker::CHROME_HOME_PAGE, homepage_rlz,
 105                                     rlz_lib::kMaxRlzLength)) {
 106       homepage_rlz[0] = 0;
 107     }
 108
 109     if ((first_run || homepage_rlz[0] == 0) &&
 110         (is_google_homepage || is_google_in_startpages)) {
 111       rlz_lib::RecordProductEvent(rlz_lib::CHROME,
 112                                   RLZTracker::CHROME_HOME_PAGE,
 113                                   rlz_lib::SET_TO_GOOGLE);
 114     }
 115   }
 116
 117   // Record first user interaction with the omnibox. We call this all the
 118   // time but the rlz lib should ingore all but the first one.
 119   if (omnibox_used) {
 120     rlz_lib::RecordProductEvent(rlz_lib::CHROME,
 121                                 RLZTracker::CHROME_OMNIBOX,
 122                                 rlz_lib::FIRST_SEARCH);
 123   }
 124
 125   // Record first user interaction with the home page. We call this all the
 126   // time but the rlz lib should ingore all but the first one.
 127   if (homepage_used || is_google_in_startpages) {
 128     rlz_lib::RecordProductEvent(rlz_lib::CHROME,
 129                                 RLZTracker::CHROME_HOME_PAGE,
 130                                 rlz_lib::FIRST_SEARCH);
 131   }
 132 }
 133
 134 bool SendFinancialPing(const std::string& brand,
 135                        const string16& lang,
 136                        const string16& referral) {
 137   rlz_lib::AccessPoint points[] = {RLZTracker::CHROME_OMNIBOX,
 138                                    RLZTracker::CHROME_HOME_PAGE,
 139                                    rlz_lib::NO_ACCESS_POINT};
 140   std::string lang_ascii(UTF16ToASCII(lang));
 141   std::string referral_ascii(UTF16ToASCII(referral));
 142   std::string product_signature;
 143 #if defined(OS_CHROMEOS)
 144   product_signature = "chromeos";
 145 #else
 146   product_signature = "chrome";
 147 #endif
 148   return rlz_lib::SendFinancialPing(rlz_lib::CHROME, points,
 149                                     product_signature.c_str(),
 150                                     brand.c_str(), referral_ascii.c_str(),
 151                                     lang_ascii.c_str(), false, true);
 152 }
 153
 154 }  // namespace
 155
 156 #if defined(OS_WIN)
 157 // static
 158 const rlz_lib::AccessPoint RLZTracker::CHROME_OMNIBOX =
 159     rlz_lib::CHROME_OMNIBOX;
 160 // static
 161 const rlz_lib::AccessPoint RLZTracker::CHROME_HOME_PAGE =
 162     rlz_lib::CHROME_HOME_PAGE;
 163 #elif defined(OS_IOS)
 164 // static
 165 const rlz_lib::AccessPoint RLZTracker::CHROME_OMNIBOX =
 166     rlz_lib::CHROME_IOS_OMNIBOX;
 167 // static
 168 const rlz_lib::AccessPoint RLZTracker::CHROME_HOME_PAGE =
 169     rlz_lib::CHROME_IOS_HOME_PAGE;
 170 #elif defined(OS_MACOSX)
 171 // static
 172 const rlz_lib::AccessPoint RLZTracker::CHROME_OMNIBOX =
 173     rlz_lib::CHROME_MAC_OMNIBOX;
 174 // static
 175 const rlz_lib::AccessPoint RLZTracker::CHROME_HOME_PAGE =
 176     rlz_lib::CHROME_MAC_HOME_PAGE;
 177 #elif defined(OS_CHROMEOS)
 178 // static
 179 const rlz_lib::AccessPoint RLZTracker::CHROME_OMNIBOX =
 180     rlz_lib::CHROMEOS_OMNIBOX;
 181 // static
 182 const rlz_lib::AccessPoint RLZTracker::CHROME_HOME_PAGE =
 183     rlz_lib::CHROMEOS_HOME_PAGE;
 184 #endif
 185
 186 RLZTracker* RLZTracker::tracker_ = NULL;
 187
 188 // static
 189 RLZTracker* RLZTracker::GetInstance() {
 190   return tracker_ ? tracker_ : Singleton<RLZTracker>::get();
 191 }
 192
 193 RLZTracker::RLZTracker()
 194     : first_run_(false),
 195       send_ping_immediately_(false),
 196       is_google_default_search_(false),
 197       is_google_homepage_(false),
 198       is_google_in_startpages_(false),
 199       worker_pool_token_(BrowserThread::GetBlockingPool()->GetSequenceToken()),
 200       already_ran_(false),
 201       omnibox_used_(false),
 202       homepage_used_(false),
 203       min_init_delay_(kMinInitDelay) {
 204 }
 205
 206 RLZTracker::~RLZTracker() {
 207 }
 208
 209 // static
 210 bool RLZTracker::InitRlzDelayed(bool first_run,
 211                                 bool send_ping_immediately,
 212                                 base::TimeDelta delay,
 213                                 bool is_google_default_search,
 214                                 bool is_google_homepage,
 215                                 bool is_google_in_startpages) {
 216   return GetInstance()->Init(first_run, send_ping_immediately, delay,
 217                              is_google_default_search, is_google_homepage,
 218                              is_google_in_startpages);
 219 }
 220
 221 // static
 222 bool RLZTracker::InitRlzFromProfileDelayed(Profile* profile,
 223                                            bool first_run,
 224                                            bool send_ping_immediately,
 225                                            base::TimeDelta delay) {
 226   bool is_google_default_search = false;
 227   TemplateURLService* template_url_service =
 228       TemplateURLServiceFactory::GetForProfile(profile);
 229   if (template_url_service) {
 230     const TemplateURL* url_template =
 231         template_url_service->GetDefaultSearchProvider();
 232     is_google_default_search =
 233         url_template && url_template->url_ref().HasGoogleBaseURLs();
 234   }
 235
 236   PrefService* pref_service = profile->GetPrefs();
 237   bool is_google_homepage = google_util::IsGoogleHomePageUrl(
 238       GURL(pref_service->GetString(prefs::kHomePage)));
 239
 240   bool is_google_in_startpages = false;
 241 #if !defined(OS_IOS)
 242   // iOS does not have a notion of startpages.
 243   SessionStartupPref session_startup_prefs =
 244       StartupBrowserCreator::GetSessionStartupPref(
 245           *CommandLine::ForCurrentProcess(), profile);
 246   if (session_startup_prefs.type == SessionStartupPref::URLS) {
 247     is_google_in_startpages =
 248         std::count_if(session_startup_prefs.urls.begin(),
 249                       session_startup_prefs.urls.end(),
 250                       google_util::IsGoogleHomePageUrl) > 0;
 251   }
 252 #endif
 253
 254   if (!InitRlzDelayed(first_run, send_ping_immediately, delay,
 255                       is_google_default_search, is_google_homepage,
 256                       is_google_in_startpages)) {
 257     return false;
 258   }
 259
 260   // Prime the RLZ cache for the home page access point so that its avaiable
 261   // for the startup page if needed (i.e., when the startup page is set to
 262   // the home page).
 263   GetAccessPointRlz(CHROME_HOME_PAGE, NULL);
 264
 265   return true;
 266 }
 267
 268 bool RLZTracker::Init(bool first_run,
 269                       bool send_ping_immediately,
 270                       base::TimeDelta delay,
 271                       bool is_google_default_search,
 272                       bool is_google_homepage,
 273                       bool is_google_in_startpages) {
 274   first_run_ = first_run;
 275   is_google_default_search_ = is_google_default_search;
 276   is_google_homepage_ = is_google_homepage;
 277   is_google_in_startpages_ = is_google_in_startpages;
 278   send_ping_immediately_ = send_ping_immediately;
 279
 280   // Enable zero delays for testing.
 281   if (CommandLine::ForCurrentProcess()->HasSwitch(::switches::kTestType))
 282     EnableZeroDelayForTesting();
 283
 284   delay = std::min(kMaxInitDelay, std::max(min_init_delay_, delay));
 285
 286   if (google_util::GetBrand(&brand_) && !IsBrandOrganic(brand_)) {
 287     // Register for notifications from the omnibox so that we can record when
 288     // the user performs a first search.
 289     registrar_.Add(this, chrome::NOTIFICATION_OMNIBOX_OPENED_URL,
 290                    content::NotificationService::AllSources());
 291
 292     // Register for notifications from navigations, to see if the user has used
 293     // the home page.
 294     registrar_.Add(this, content::NOTIFICATION_NAV_ENTRY_PENDING,
 295                    content::NotificationService::AllSources());
 296   }
 297   google_util::GetReactivationBrand(&reactivation_brand_);
 298
 299   net::URLRequestContextGetter* context_getter =
 300       g_browser_process->system_request_context();
 301
 302   // Could be NULL; don't run if so.  RLZ will try again next restart.
 303   if (context_getter) {
 304     rlz_lib::SetURLRequestContext(context_getter);
 305     ScheduleDelayedInit(delay);
 306   }
 307
 308   return true;
 309 }
 310
 311 void RLZTracker::ScheduleDelayedInit(base::TimeDelta delay) {
 312   // The RLZTracker is a singleton object that outlives any runnable tasks
 313   // that will be queued up.
 314   BrowserThread::GetBlockingPool()->PostDelayedSequencedWorkerTask(
 315       worker_pool_token_,
 316       FROM_HERE,
 317       base::Bind(&RLZTracker::DelayedInit, base::Unretained(this)),
 318       delay);
 319 }
 320
 321 void RLZTracker::DelayedInit() {
 322   bool schedule_ping = false;
 323
 324   // For organic brandcodes do not use rlz at all. Empty brandcode usually
 325   // means a chromium install. This is ok.
 326   if (!IsBrandOrganic(brand_)) {
 327     RecordProductEvents(first_run_, is_google_default_search_,
 328                         is_google_homepage_, is_google_in_startpages_,
 329                         already_ran_, omnibox_used_, homepage_used_);
 330     schedule_ping = true;
 331   }
 332
 333   // If chrome has been reactivated, record the events for this brand
 334   // as well.
 335   if (!IsBrandOrganic(reactivation_brand_)) {
 336     rlz_lib::SupplementaryBranding branding(reactivation_brand_.c_str());
 337     RecordProductEvents(first_run_, is_google_default_search_,
 338                         is_google_homepage_, is_google_in_startpages_,
 339                         already_ran_, omnibox_used_, homepage_used_);
 340     schedule_ping = true;
 341   }
 342
 343   already_ran_ = true;
 344
 345   if (schedule_ping)
 346     ScheduleFinancialPing();
 347 }
 348
 349 void RLZTracker::ScheduleFinancialPing() {
 350   BrowserThread::GetBlockingPool()->PostSequencedWorkerTaskWithShutdownBehavior(
 351       worker_pool_token_,
 352       FROM_HERE,
 353       base::Bind(&RLZTracker::PingNowImpl, base::Unretained(this)),
 354       base::SequencedWorkerPool::SKIP_ON_SHUTDOWN);
 355 }
 356
 357 void RLZTracker::PingNowImpl() {
 358   TRACE_EVENT0("RLZ", "RLZTracker::PingNowImpl");
 359   string16 lang;
 360   GoogleUpdateSettings::GetLanguage(&lang);
 361   if (lang.empty())
 362     lang = ASCIIToUTF16("en");
 363   string16 referral;
 364   GoogleUpdateSettings::GetReferral(&referral);
 365
 366   if (!IsBrandOrganic(brand_) && SendFinancialPing(brand_, lang, referral)) {
 367     GoogleUpdateSettings::ClearReferral();
 368
 369     {
 370       base::AutoLock lock(cache_lock_);
 371       rlz_cache_.clear();
 372     }
 373
 374     // Prime the RLZ cache for the access points we are interested in.
 375     GetAccessPointRlz(RLZTracker::CHROME_OMNIBOX, NULL);
 376     GetAccessPointRlz(RLZTracker::CHROME_HOME_PAGE, NULL);
 377   }
 378
 379   if (!IsBrandOrganic(reactivation_brand_)) {
 380     rlz_lib::SupplementaryBranding branding(reactivation_brand_.c_str());
 381     SendFinancialPing(reactivation_brand_, lang, referral);
 382   }
 383 }
 384
 385 bool RLZTracker::SendFinancialPing(const std::string& brand,
 386                                    const string16& lang,
 387                                    const string16& referral) {
 388   return ::SendFinancialPing(brand, lang, referral);
 389 }
 390
 391 void RLZTracker::Observe(int type,
 392                          const content::NotificationSource& source,
 393                          const content::NotificationDetails& details) {
 394   switch (type) {
 395     case chrome::NOTIFICATION_OMNIBOX_OPENED_URL:
 396       RecordFirstSearch(CHROME_OMNIBOX);
 397       registrar_.Remove(this, chrome::NOTIFICATION_OMNIBOX_OPENED_URL,
 398                         content::NotificationService::AllSources());
 399       break;
 400     case content::NOTIFICATION_NAV_ENTRY_PENDING: {
 401       const NavigationEntry* entry =
 402           content::Details<content::NavigationEntry>(details).ptr();
 403       if (entry != NULL &&
 404           ((entry->GetTransitionType() &
 405             content::PAGE_TRANSITION_HOME_PAGE) != 0)) {
 406         RecordFirstSearch(CHROME_HOME_PAGE);
 407         registrar_.Remove(this, content::NOTIFICATION_NAV_ENTRY_PENDING,
 408                           content::NotificationService::AllSources());
 409       }
 410       break;
 411     }
 412     default:
 413       NOTREACHED();
 414       break;
 415   }
 416 }
 417
 418 // static
 419 bool RLZTracker::RecordProductEvent(rlz_lib::Product product,
 420                                     rlz_lib::AccessPoint point,
 421                                     rlz_lib::Event event_id) {
 422   return GetInstance()->RecordProductEventImpl(product, point, event_id);
 423 }
 424
 425 bool RLZTracker::RecordProductEventImpl(rlz_lib::Product product,
 426                                         rlz_lib::AccessPoint point,
 427                                         rlz_lib::Event event_id) {
 428   // Make sure we don't access disk outside of the I/O thread.
 429   // In such case we repost the task on the right thread and return error.
 430   if (ScheduleRecordProductEvent(product, point, event_id))
 431     return true;
 432
 433   bool ret = rlz_lib::RecordProductEvent(product, point, event_id);
 434
 435   // If chrome has been reactivated, record the event for this brand as well.
 436   if (!reactivation_brand_.empty()) {
 437     rlz_lib::SupplementaryBranding branding(reactivation_brand_.c_str());
 438     ret &= rlz_lib::RecordProductEvent(product, point, event_id);
 439   }
 440
 441   return ret;
 442 }
 443
 444 bool RLZTracker::ScheduleRecordProductEvent(rlz_lib::Product product,
 445                                             rlz_lib::AccessPoint point,
 446                                             rlz_lib::Event event_id) {
 447   if (!BrowserThread::CurrentlyOn(BrowserThread::UI))
 448     return false;
 449
 450   BrowserThread::GetBlockingPool()->PostSequencedWorkerTaskWithShutdownBehavior(
 451       worker_pool_token_,
 452       FROM_HERE,
 453       base::Bind(base::IgnoreResult(&RLZTracker::RecordProductEvent),
 454                  product, point, event_id),
 455       base::SequencedWorkerPool::SKIP_ON_SHUTDOWN);
 456
 457   return true;
 458 }
 459
 460 void RLZTracker::RecordFirstSearch(rlz_lib::AccessPoint point) {
 461   // Make sure we don't access disk outside of the I/O thread.
 462   // In such case we repost the task on the right thread and return error.
 463   if (ScheduleRecordFirstSearch(point))
 464     return;
 465
 466   bool* record_used = point == CHROME_OMNIBOX ?
 467       &omnibox_used_ : &homepage_used_;
 468
 469   // Try to record event now, else set the flag to try later when we
 470   // attempt the ping.
 471   if (!RecordProductEvent(rlz_lib::CHROME, point, rlz_lib::FIRST_SEARCH))
 472     *record_used = true;
 473   else if (send_ping_immediately_ && point == CHROME_OMNIBOX)
 474     ScheduleDelayedInit(base::TimeDelta());
 475 }
 476
 477 bool RLZTracker::ScheduleRecordFirstSearch(rlz_lib::AccessPoint point) {
 478   if (!BrowserThread::CurrentlyOn(BrowserThread::UI))
 479     return false;
 480   BrowserThread::GetBlockingPool()->PostSequencedWorkerTaskWithShutdownBehavior(
 481       worker_pool_token_,
 482       FROM_HERE,
 483       base::Bind(&RLZTracker::RecordFirstSearch,
 484                  base::Unretained(this), point),
 485       base::SequencedWorkerPool::SKIP_ON_SHUTDOWN);
 486   return true;
 487 }
 488
 489 // static
 490 std::string RLZTracker::GetAccessPointHttpHeader(rlz_lib::AccessPoint point) {
 491   TRACE_EVENT0("RLZ", "RLZTracker::GetAccessPointHttpHeader");
 492   std::string extra_headers;
 493   string16 rlz_string;
 494   RLZTracker::GetAccessPointRlz(point, &rlz_string);
 495   if (!rlz_string.empty()) {
 496     net::HttpUtil::AppendHeaderIfMissing("X-Rlz-String",
 497                                          UTF16ToUTF8(rlz_string),
 498                                          &extra_headers);
 499   }
 500
 501   return extra_headers;
 502 }
 503
 504 // GetAccessPointRlz() caches RLZ strings for all access points. If we had
 505 // a successful ping, then we update the cached value.
 506 bool RLZTracker::GetAccessPointRlz(rlz_lib::AccessPoint point,
 507                                    string16* rlz) {
 508   TRACE_EVENT0("RLZ", "RLZTracker::GetAccessPointRlz");
 509   return GetInstance()->GetAccessPointRlzImpl(point, rlz);
 510 }
 511
 512 // GetAccessPointRlz() caches RLZ strings for all access points. If we had
 513 // a successful ping, then we update the cached value.
 514 bool RLZTracker::GetAccessPointRlzImpl(rlz_lib::AccessPoint point,
 515                                        string16* rlz) {
 516   // If the RLZ string for the specified access point is already cached,
 517   // simply return its value.
 518   {
 519     base::AutoLock lock(cache_lock_);
 520     if (rlz_cache_.find(point) != rlz_cache_.end()) {
 521       if (rlz)
 522         *rlz = rlz_cache_[point];
 523       return true;
 524     }
 525   }
 526
 527   // Make sure we don't access disk outside of the I/O thread.
 528   // In such case we repost the task on the right thread and return error.
 529   if (ScheduleGetAccessPointRlz(point))
 530     return false;
 531
 532   char str_rlz[rlz_lib::kMaxRlzLength + 1];
 533   if (!rlz_lib::GetAccessPointRlz(point, str_rlz, rlz_lib::kMaxRlzLength))
 534     return false;
 535
 536   string16 rlz_local(ASCIIToUTF16(std::string(str_rlz)));
 537   if (rlz)
 538     *rlz = rlz_local;
 539
 540   base::AutoLock lock(cache_lock_);
 541   rlz_cache_[point] = rlz_local;
 542   return true;
 543 }
 544
 545 bool RLZTracker::ScheduleGetAccessPointRlz(rlz_lib::AccessPoint point) {
 546   if (!BrowserThread::CurrentlyOn(BrowserThread::UI))
 547     return false;
 548
 549   string16* not_used = NULL;
 550   BrowserThread::GetBlockingPool()->PostSequencedWorkerTaskWithShutdownBehavior(
 551       worker_pool_token_,
 552       FROM_HERE,
 553       base::Bind(base::IgnoreResult(&RLZTracker::GetAccessPointRlz), point,
 554                  not_used),
 555       base::SequencedWorkerPool::SKIP_ON_SHUTDOWN);
 556   return true;
 557 }
 558
 559 #if defined(OS_CHROMEOS)
 560 // static
 561 void RLZTracker::ClearRlzState() {
 562   GetInstance()->ClearRlzStateImpl();
 563 }
 564
 565 void RLZTracker::ClearRlzStateImpl() {
 566   if (ScheduleClearRlzState())
 567     return;
 568   rlz_lib::ClearAllProductEvents(rlz_lib::CHROME);
 569 }
 570
 571 bool RLZTracker::ScheduleClearRlzState() {
 572   if (!BrowserThread::CurrentlyOn(BrowserThread::UI))
 573     return false;
 574
 575   BrowserThread::GetBlockingPool()->PostSequencedWorkerTaskWithShutdownBehavior(
 576       worker_pool_token_,
 577       FROM_HERE,
 578       base::Bind(&RLZTracker::ClearRlzStateImpl,
 579                  base::Unretained(this)),
 580       base::SequencedWorkerPool::SKIP_ON_SHUTDOWN);
 581   return true;
 582 }
 583 #endif
 584
 585 // static
 586 void RLZTracker::CleanupRlz() {
 587   GetInstance()->rlz_cache_.clear();
 588   GetInstance()->registrar_.RemoveAll();
 589   rlz_lib::SetURLRequestContext(NULL);
 590 }
 591
 592 // static
 593 void RLZTracker::EnableZeroDelayForTesting() {
 594   GetInstance()->min_init_delay_ = base::TimeDelta();
 595 }