chrome/browser/search/instant_service.cc

   1 // Copyright 2013 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/search/instant_service.h"
   6
   7 #include "base/metrics/field_trial.h"
   8 #include "base/strings/string_util.h"
   9 #include "base/strings/utf_string_conversions.h"
  10 #include "chrome/browser/chrome_notification_types.h"
  11 #include "chrome/browser/favicon/fallback_icon_service_factory.h"
  12 #include "chrome/browser/favicon/large_icon_service_factory.h"
  13 #include "chrome/browser/history/top_sites_factory.h"
  14 #include "chrome/browser/profiles/profile.h"
  15 #include "chrome/browser/search/instant_io_context.h"
  16 #include "chrome/browser/search/instant_service_observer.h"
  17 #include "chrome/browser/search/most_visited_iframe_source.h"
  18 #include "chrome/browser/search/search.h"
  19 #include "chrome/browser/search/suggestions/suggestions_service_factory.h"
  20 #include "chrome/browser/search/suggestions/suggestions_source.h"
  21 #include "chrome/browser/search/thumbnail_source.h"
  22 #include "chrome/browser/search_engines/template_url_service_factory.h"
  23 #include "chrome/browser/search_engines/ui_thread_search_terms_data.h"
  24 #include "chrome/browser/thumbnails/thumbnail_list_source.h"
  25 #include "chrome/browser/ui/search/instant_search_prerenderer.h"
  26 #include "chrome/browser/ui/webui/fallback_icon_source.h"
  27 #include "chrome/browser/ui/webui/favicon_source.h"
  28 #include "chrome/browser/ui/webui/large_icon_source.h"
  29 #include "chrome/browser/ui/webui/theme_source.h"
  30 #include "chrome/common/render_messages.h"
  31 #include "components/favicon/core/fallback_icon_service.h"
  32 #include "components/favicon/core/large_icon_service.h"
  33 #include "components/history/core/browser/top_sites.h"
  34 #include "components/keyed_service/core/service_access_type.h"
  35 #include "components/search/search.h"
  36 #include "components/search_engines/template_url_service.h"
  37 #include "content/public/browser/browser_thread.h"
  38 #include "content/public/browser/notification_service.h"
  39 #include "content/public/browser/notification_types.h"
  40 #include "content/public/browser/render_process_host.h"
  41 #include "content/public/browser/url_data_source.h"
  42 #include "grit/theme_resources.h"
  43 #include "third_party/skia/include/core/SkColor.h"
  44 #include "ui/gfx/color_utils.h"
  45 #include "ui/gfx/image/image_skia.h"
  46
  47 #if !defined(OS_ANDROID)
  48 #include "chrome/browser/search/local_ntp_source.h"
  49 #endif
  50
  51 #if defined(ENABLE_THEMES)
  52 #include "chrome/browser/themes/theme_properties.h"
  53 #include "chrome/browser/themes/theme_service.h"
  54 #include "chrome/browser/themes/theme_service_factory.h"
  55 #endif  // defined(ENABLE_THEMES)
  56
  57 namespace {
  58
  59 const char kLocalNTPSuggestionService[] = "LocalNTPSuggestionsService";
  60 const char kLocalNTPSuggestionServiceEnabled[] = "Enabled";
  61
  62 bool IsLocalNTPSuggestionServiceEnabled() {
  63   return base::StartsWith(
  64       base::FieldTrialList::FindFullName(kLocalNTPSuggestionService),
  65       kLocalNTPSuggestionServiceEnabled, base::CompareCase::INSENSITIVE_ASCII);
  66 }
  67
  68 }  // namespace
  69
  70 InstantService::InstantService(Profile* profile)
  71     : profile_(profile),
  72       template_url_service_(TemplateURLServiceFactory::GetForProfile(profile_)),
  73       omnibox_start_margin_(search::kDisableStartMargin),
  74       suggestions_service_(NULL),
  75       weak_ptr_factory_(this) {
  76   // The initialization below depends on a typical set of browser threads. Skip
  77   // it if we are running in a unit test without the full suite.
  78   if (!content::BrowserThread::CurrentlyOn(content::BrowserThread::UI))
  79     return;
  80
  81   // This depends on the existence of the typical browser threads. Therefore it
  82   // is only instantiated here (after the check for a UI thread above).
  83   instant_io_context_ = new InstantIOContext();
  84
  85   previous_google_base_url_ =
  86       GURL(UIThreadSearchTermsData(profile).GoogleBaseURLValue());
  87
  88   // TemplateURLService is NULL by default in tests.
  89   if (template_url_service_) {
  90     template_url_service_->AddObserver(this);
  91     const TemplateURL* default_search_provider =
  92         template_url_service_->GetDefaultSearchProvider();
  93     if (default_search_provider) {
  94       previous_default_search_provider_.reset(
  95           new TemplateURLData(default_search_provider->data()));
  96     }
  97   }
  98
  99   ResetInstantSearchPrerenderer();
 100
 101   registrar_.Add(this,
 102                  content::NOTIFICATION_RENDERER_PROCESS_CREATED,
 103                  content::NotificationService::AllSources());
 104   registrar_.Add(this,
 105                  content::NOTIFICATION_RENDERER_PROCESS_TERMINATED,
 106                  content::NotificationService::AllSources());
 107
 108   scoped_refptr<history::TopSites> top_sites =
 109       TopSitesFactory::GetForProfile(profile_);
 110   if (top_sites)
 111     top_sites->AddObserver(this);
 112
 113   if (profile_ && profile_->GetResourceContext()) {
 114     content::BrowserThread::PostTask(
 115         content::BrowserThread::IO, FROM_HERE,
 116         base::Bind(&InstantIOContext::SetUserDataOnIO,
 117                    profile->GetResourceContext(), instant_io_context_));
 118   }
 119
 120   // Set up the data sources that Instant uses on the NTP.
 121 #if defined(ENABLE_THEMES)
 122   // Listen for theme installation.
 123   registrar_.Add(this, chrome::NOTIFICATION_BROWSER_THEME_CHANGED,
 124                  content::Source<ThemeService>(
 125                      ThemeServiceFactory::GetForProfile(profile_)));
 126
 127   content::URLDataSource::Add(profile_, new ThemeSource(profile_));
 128 #endif  // defined(ENABLE_THEMES)
 129
 130   // TODO(aurimas) remove this #if once instant_service.cc is no longer compiled
 131   // on Android.
 132 #if !defined(OS_ANDROID)
 133   content::URLDataSource::Add(profile_, new LocalNtpSource(profile_));
 134   content::URLDataSource::Add(profile_, new ThumbnailSource(profile_, false));
 135   content::URLDataSource::Add(profile_, new ThumbnailSource(profile_, true));
 136   content::URLDataSource::Add(profile_, new ThumbnailListSource(profile_));
 137 #endif  // !defined(OS_ANDROID)
 138
 139   favicon::FallbackIconService* fallback_icon_service =
 140       FallbackIconServiceFactory::GetForBrowserContext(profile_);
 141   favicon::LargeIconService* large_icon_service =
 142       LargeIconServiceFactory::GetForBrowserContext(profile_);
 143   content::URLDataSource::Add(
 144       profile_, new FallbackIconSource(fallback_icon_service));
 145   content::URLDataSource::Add(
 146       profile_, new FaviconSource(profile_, FaviconSource::FAVICON));
 147   content::URLDataSource::Add(
 148       profile_, new LargeIconSource(fallback_icon_service, large_icon_service));
 149   content::URLDataSource::Add(profile_, new MostVisitedIframeSource());
 150   content::URLDataSource::Add(
 151       profile_, new suggestions::SuggestionsSource(profile_));
 152
 153   if (IsLocalNTPSuggestionServiceEnabled()) {
 154     suggestions_service_ =
 155         suggestions::SuggestionsServiceFactory::GetForProfile(profile_);
 156   }
 157
 158   if (suggestions_service_) {
 159     suggestions_service_->FetchSuggestionsData(
 160         suggestions::INITIALIZED_ENABLED_HISTORY,
 161         base::Bind(&InstantService::OnSuggestionsAvailable,
 162                    weak_ptr_factory_.GetWeakPtr()));
 163   }
 164 }
 165
 166 InstantService::~InstantService() {
 167   if (template_url_service_)
 168     template_url_service_->RemoveObserver(this);
 169 }
 170
 171 void InstantService::AddInstantProcess(int process_id) {
 172   process_ids_.insert(process_id);
 173
 174   if (instant_io_context_.get()) {
 175     content::BrowserThread::PostTask(
 176         content::BrowserThread::IO, FROM_HERE,
 177         base::Bind(&InstantIOContext::AddInstantProcessOnIO,
 178                    instant_io_context_, process_id));
 179   }
 180 }
 181
 182 bool InstantService::IsInstantProcess(int process_id) const {
 183   return process_ids_.find(process_id) != process_ids_.end();
 184 }
 185
 186 void InstantService::AddObserver(InstantServiceObserver* observer) {
 187   observers_.AddObserver(observer);
 188 }
 189
 190 void InstantService::RemoveObserver(InstantServiceObserver* observer) {
 191   observers_.RemoveObserver(observer);
 192 }
 193
 194 void InstantService::DeleteMostVisitedItem(const GURL& url) {
 195   scoped_refptr<history::TopSites> top_sites =
 196       TopSitesFactory::GetForProfile(profile_);
 197   if (top_sites)
 198     top_sites->AddBlacklistedURL(url);
 199
 200   if (suggestions_service_) {
 201     suggestions_service_->BlacklistURL(
 202         url, base::Bind(&InstantService::OnSuggestionsAvailable,
 203                         weak_ptr_factory_.GetWeakPtr()),
 204         base::Closure());
 205   }
 206 }
 207
 208 void InstantService::UndoMostVisitedDeletion(const GURL& url) {
 209   scoped_refptr<history::TopSites> top_sites =
 210       TopSitesFactory::GetForProfile(profile_);
 211   if (top_sites)
 212     top_sites->RemoveBlacklistedURL(url);
 213
 214   if (suggestions_service_) {
 215     suggestions_service_->UndoBlacklistURL(
 216         url, base::Bind(&InstantService::OnSuggestionsAvailable,
 217                         weak_ptr_factory_.GetWeakPtr()),
 218         base::Closure());
 219   }
 220 }
 221
 222 void InstantService::UndoAllMostVisitedDeletions() {
 223   scoped_refptr<history::TopSites> top_sites =
 224       TopSitesFactory::GetForProfile(profile_);
 225   if (top_sites)
 226     top_sites->ClearBlacklistedURLs();
 227
 228   if (suggestions_service_) {
 229     suggestions_service_->ClearBlacklist(
 230         base::Bind(&InstantService::OnSuggestionsAvailable,
 231                    weak_ptr_factory_.GetWeakPtr()));
 232   }
 233 }
 234
 235 void InstantService::UpdateThemeInfo() {
 236 #if defined(ENABLE_THEMES)
 237   // Update theme background info.
 238   // Initialize |theme_info| if necessary.
 239   if (!theme_info_)
 240     OnThemeChanged(ThemeServiceFactory::GetForProfile(profile_));
 241   else
 242     OnThemeChanged(NULL);
 243 #endif  // defined(ENABLE_THEMES)
 244 }
 245
 246 void InstantService::UpdateMostVisitedItemsInfo() {
 247   NotifyAboutMostVisitedItems();
 248 }
 249
 250 void InstantService::Shutdown() {
 251   process_ids_.clear();
 252
 253   if (instant_io_context_.get()) {
 254     content::BrowserThread::PostTask(
 255         content::BrowserThread::IO, FROM_HERE,
 256         base::Bind(&InstantIOContext::ClearInstantProcessesOnIO,
 257                    instant_io_context_));
 258   }
 259
 260   scoped_refptr<history::TopSites> top_sites =
 261       TopSitesFactory::GetForProfile(profile_);
 262   if (top_sites)
 263     top_sites->RemoveObserver(this);
 264
 265   instant_io_context_ = NULL;
 266 }
 267
 268 void InstantService::Observe(int type,
 269                              const content::NotificationSource& source,
 270                              const content::NotificationDetails& details) {
 271   switch (type) {
 272     case content::NOTIFICATION_RENDERER_PROCESS_CREATED:
 273       SendSearchURLsToRenderer(
 274           content::Source<content::RenderProcessHost>(source).ptr());
 275       break;
 276     case content::NOTIFICATION_RENDERER_PROCESS_TERMINATED:
 277       OnRendererProcessTerminated(
 278           content::Source<content::RenderProcessHost>(source)->GetID());
 279       break;
 280 #if defined(ENABLE_THEMES)
 281     case chrome::NOTIFICATION_BROWSER_THEME_CHANGED: {
 282       OnThemeChanged(content::Source<ThemeService>(source).ptr());
 283       break;
 284     }
 285 #endif  // defined(ENABLE_THEMES)
 286     default:
 287       NOTREACHED() << "Unexpected notification type in InstantService.";
 288   }
 289 }
 290
 291 void InstantService::SendSearchURLsToRenderer(content::RenderProcessHost* rph) {
 292   rph->Send(new ChromeViewMsg_SetSearchURLs(
 293       search::GetSearchURLs(profile_), search::GetNewTabPageURL(profile_)));
 294 }
 295
 296 void InstantService::OnOmniboxStartMarginChanged(int start_margin) {
 297   omnibox_start_margin_ = start_margin;
 298   FOR_EACH_OBSERVER(InstantServiceObserver, observers_,
 299                     OmniboxStartMarginChanged(omnibox_start_margin_));
 300 }
 301
 302 void InstantService::OnRendererProcessTerminated(int process_id) {
 303   process_ids_.erase(process_id);
 304
 305   if (instant_io_context_.get()) {
 306     content::BrowserThread::PostTask(
 307         content::BrowserThread::IO, FROM_HERE,
 308         base::Bind(&InstantIOContext::RemoveInstantProcessOnIO,
 309                    instant_io_context_, process_id));
 310   }
 311 }
 312
 313 void InstantService::OnSuggestionsAvailable(
 314     const suggestions::SuggestionsProfile& profile) {
 315   std::vector<InstantMostVisitedItem> new_suggestions_items;
 316   for (int i = 0; i < profile.suggestions_size(); ++i) {
 317     const suggestions::ChromeSuggestion& suggestion = profile.suggestions(i);
 318
 319     InstantMostVisitedItem item;
 320     item.url = GURL(suggestion.url());
 321     item.title = base::UTF8ToUTF16(suggestion.title());
 322     if (suggestion.has_thumbnail()) {
 323       item.thumbnail = GURL(suggestion.thumbnail());
 324     }
 325     if (suggestion.has_favicon_url()) {
 326       item.favicon = GURL(suggestion.favicon_url());
 327     }
 328     if (suggestion.has_impression_url()) {
 329       item.impression_url = GURL(suggestion.impression_url());
 330     }
 331     if (suggestion.has_click_url()) {
 332       item.click_url = GURL(suggestion.click_url());
 333     }
 334     new_suggestions_items.push_back(item);
 335   }
 336   suggestions_items_ = new_suggestions_items;
 337   NotifyAboutMostVisitedItems();
 338 }
 339
 340 void InstantService::OnMostVisitedItemsReceived(
 341     const history::MostVisitedURLList& data) {
 342   history::MostVisitedURLList reordered_data(data);
 343   std::vector<InstantMostVisitedItem> new_most_visited_items;
 344   for (size_t i = 0; i < reordered_data.size(); i++) {
 345     const history::MostVisitedURL& url = reordered_data[i];
 346     InstantMostVisitedItem item;
 347     item.url = url.url;
 348     item.title = url.title;
 349     new_most_visited_items.push_back(item);
 350   }
 351
 352   most_visited_items_ = new_most_visited_items;
 353   NotifyAboutMostVisitedItems();
 354 }
 355
 356 void InstantService::NotifyAboutMostVisitedItems() {
 357   if (suggestions_service_ && !suggestions_items_.empty()) {
 358     FOR_EACH_OBSERVER(InstantServiceObserver, observers_,
 359                       MostVisitedItemsChanged(suggestions_items_));
 360   } else {
 361     FOR_EACH_OBSERVER(InstantServiceObserver, observers_,
 362                       MostVisitedItemsChanged(most_visited_items_));
 363   }
 364 }
 365
 366 #if defined(ENABLE_THEMES)
 367
 368 namespace {
 369
 370 const int kSectionBorderAlphaTransparency = 80;
 371
 372 // Converts SkColor to RGBAColor
 373 RGBAColor SkColorToRGBAColor(const SkColor& sKColor) {
 374   RGBAColor color;
 375   color.r = SkColorGetR(sKColor);
 376   color.g = SkColorGetG(sKColor);
 377   color.b = SkColorGetB(sKColor);
 378   color.a = SkColorGetA(sKColor);
 379   return color;
 380 }
 381
 382 }  // namespace
 383
 384 void InstantService::OnThemeChanged(ThemeService* theme_service) {
 385   if (!theme_service) {
 386     DCHECK(theme_info_.get());
 387     FOR_EACH_OBSERVER(InstantServiceObserver, observers_,
 388                       ThemeInfoChanged(*theme_info_));
 389     return;
 390   }
 391
 392   // Get theme information from theme service.
 393   theme_info_.reset(new ThemeBackgroundInfo());
 394
 395   // Get if the current theme is the default theme.
 396   theme_info_->using_default_theme = theme_service->UsingDefaultTheme();
 397
 398   // Get theme colors.
 399   SkColor background_color =
 400       theme_service->GetColor(ThemeProperties::COLOR_NTP_BACKGROUND);
 401   SkColor text_color =
 402       theme_service->GetColor(ThemeProperties::COLOR_NTP_TEXT);
 403   SkColor link_color =
 404       theme_service->GetColor(ThemeProperties::COLOR_NTP_LINK);
 405   SkColor text_color_light =
 406       theme_service->GetColor(ThemeProperties::COLOR_NTP_TEXT_LIGHT);
 407   SkColor header_color =
 408       theme_service->GetColor(ThemeProperties::COLOR_NTP_HEADER);
 409   // Generate section border color from the header color.
 410   SkColor section_border_color =
 411       SkColorSetARGB(kSectionBorderAlphaTransparency,
 412                      SkColorGetR(header_color),
 413                      SkColorGetG(header_color),
 414                      SkColorGetB(header_color));
 415
 416   // Invert colors if needed.
 417   if (color_utils::IsInvertedColorScheme()) {
 418     background_color = color_utils::InvertColor(background_color);
 419     text_color = color_utils::InvertColor(text_color);
 420     link_color = color_utils::InvertColor(link_color);
 421     text_color_light = color_utils::InvertColor(text_color_light);
 422     header_color = color_utils::InvertColor(header_color);
 423     section_border_color = color_utils::InvertColor(section_border_color);
 424   }
 425
 426   // Set colors.
 427   theme_info_->background_color = SkColorToRGBAColor(background_color);
 428   theme_info_->text_color = SkColorToRGBAColor(text_color);
 429   theme_info_->link_color = SkColorToRGBAColor(link_color);
 430   theme_info_->text_color_light = SkColorToRGBAColor(text_color_light);
 431   theme_info_->header_color = SkColorToRGBAColor(header_color);
 432   theme_info_->section_border_color = SkColorToRGBAColor(section_border_color);
 433
 434   int logo_alternate = theme_service->GetDisplayProperty(
 435       ThemeProperties::NTP_LOGO_ALTERNATE);
 436   theme_info_->logo_alternate = logo_alternate == 1;
 437
 438   if (theme_service->HasCustomImage(IDR_THEME_NTP_BACKGROUND)) {
 439     // Set theme id for theme background image url.
 440     theme_info_->theme_id = theme_service->GetThemeID();
 441
 442     // Set theme background image horizontal alignment.
 443     int alignment = theme_service->GetDisplayProperty(
 444         ThemeProperties::NTP_BACKGROUND_ALIGNMENT);
 445     if (alignment & ThemeProperties::ALIGN_LEFT)
 446       theme_info_->image_horizontal_alignment = THEME_BKGRND_IMAGE_ALIGN_LEFT;
 447     else if (alignment & ThemeProperties::ALIGN_RIGHT)
 448       theme_info_->image_horizontal_alignment = THEME_BKGRND_IMAGE_ALIGN_RIGHT;
 449     else
 450       theme_info_->image_horizontal_alignment = THEME_BKGRND_IMAGE_ALIGN_CENTER;
 451
 452     // Set theme background image vertical alignment.
 453     if (alignment & ThemeProperties::ALIGN_TOP)
 454       theme_info_->image_vertical_alignment = THEME_BKGRND_IMAGE_ALIGN_TOP;
 455     else if (alignment & ThemeProperties::ALIGN_BOTTOM)
 456       theme_info_->image_vertical_alignment = THEME_BKGRND_IMAGE_ALIGN_BOTTOM;
 457     else
 458       theme_info_->image_vertical_alignment = THEME_BKGRND_IMAGE_ALIGN_CENTER;
 459
 460     // Set theme backgorund image tiling.
 461     int tiling = theme_service->GetDisplayProperty(
 462         ThemeProperties::NTP_BACKGROUND_TILING);
 463     switch (tiling) {
 464       case ThemeProperties::NO_REPEAT:
 465         theme_info_->image_tiling = THEME_BKGRND_IMAGE_NO_REPEAT;
 466         break;
 467       case ThemeProperties::REPEAT_X:
 468         theme_info_->image_tiling = THEME_BKGRND_IMAGE_REPEAT_X;
 469         break;
 470       case ThemeProperties::REPEAT_Y:
 471         theme_info_->image_tiling = THEME_BKGRND_IMAGE_REPEAT_Y;
 472         break;
 473       case ThemeProperties::REPEAT:
 474         theme_info_->image_tiling = THEME_BKGRND_IMAGE_REPEAT;
 475         break;
 476     }
 477
 478     // Set theme background image height.
 479     gfx::ImageSkia* image = theme_service->GetImageSkiaNamed(
 480         IDR_THEME_NTP_BACKGROUND);
 481     DCHECK(image);
 482     theme_info_->image_height = image->height();
 483
 484     theme_info_->has_attribution =
 485        theme_service->HasCustomImage(IDR_THEME_NTP_ATTRIBUTION);
 486   }
 487
 488   FOR_EACH_OBSERVER(InstantServiceObserver, observers_,
 489                     ThemeInfoChanged(*theme_info_));
 490 }
 491 #endif  // defined(ENABLE_THEMES)
 492
 493 void InstantService::OnTemplateURLServiceChanged() {
 494   // Check whether the default search provider was changed.
 495   const TemplateURL* template_url =
 496       template_url_service_->GetDefaultSearchProvider();
 497   bool default_search_provider_changed = !TemplateURL::MatchesData(
 498       template_url, previous_default_search_provider_.get(),
 499       UIThreadSearchTermsData(profile_));
 500   if (default_search_provider_changed) {
 501     previous_default_search_provider_.reset(
 502         template_url ? new TemplateURLData(template_url->data()) : NULL);
 503   }
 504
 505   // Note that, even if the TemplateURL for the Default Search Provider has not
 506   // changed, the effective URLs might change if they reference the Google base
 507   // URL. The TemplateURLService will notify us when the effective URL changes
 508   // in this way but it's up to us to do the work to check both.
 509   bool google_base_url_domain_changed = false;
 510   GURL google_base_url(UIThreadSearchTermsData(profile_).GoogleBaseURLValue());
 511   if (google_base_url != previous_google_base_url_) {
 512     previous_google_base_url_ = google_base_url;
 513     if (template_url && template_url->HasGoogleBaseURLs(
 514             UIThreadSearchTermsData(profile_)))
 515       google_base_url_domain_changed = true;
 516   }
 517
 518   if (default_search_provider_changed || google_base_url_domain_changed) {
 519     ResetInstantSearchPrerenderer();
 520     FOR_EACH_OBSERVER(
 521         InstantServiceObserver, observers_,
 522         DefaultSearchProviderChanged(google_base_url_domain_changed));
 523   }
 524 }
 525
 526 void InstantService::TopSitesLoaded(history::TopSites* top_sites) {
 527 }
 528
 529 void InstantService::TopSitesChanged(history::TopSites* top_sites,
 530                                      ChangeReason change_reason) {
 531   // As forced urls already come from tiles, we can safely ignore those updates.
 532   if (change_reason == history::TopSitesObserver::ChangeReason::FORCED_URL)
 533     return;
 534   top_sites->GetMostVisitedURLs(
 535       base::Bind(&InstantService::OnMostVisitedItemsReceived,
 536                  weak_ptr_factory_.GetWeakPtr()),
 537       false);
 538 }
 539
 540 void InstantService::ResetInstantSearchPrerenderer() {
 541   if (!search::ShouldPrefetchSearchResults())
 542     return;
 543
 544   GURL url(search::GetSearchResultPrefetchBaseURL(profile_));
 545   instant_prerenderer_.reset(
 546       url.is_valid() ? new InstantSearchPrerenderer(profile_, url) : NULL);
 547 }