chrome/browser/ui/search/search_tab_helper.cc

   1 // Copyright 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/ui/search/search_tab_helper.h"
   6
   7 #include <set>
   8
   9 #include "base/memory/scoped_ptr.h"
  10 #include "base/metrics/histogram.h"
  11 #include "base/strings/string16.h"
  12 #include "base/strings/string_util.h"
  13 #include "chrome/browser/chrome_notification_types.h"
  14 #include "chrome/browser/history/most_visited_tiles_experiment.h"
  15 #include "chrome/browser/profiles/profile.h"
  16 #include "chrome/browser/search/instant_service.h"
  17 #include "chrome/browser/search/instant_service_factory.h"
  18 #include "chrome/browser/search/search.h"
  19 #include "chrome/browser/signin/signin_manager_factory.h"
  20 #include "chrome/browser/ui/app_list/app_list_util.h"
  21 #include "chrome/browser/ui/browser_navigator.h"
  22 #include "chrome/browser/ui/browser_window.h"
  23 #include "chrome/browser/ui/omnibox/location_bar.h"
  24 #include "chrome/browser/ui/omnibox/omnibox_edit_model.h"
  25 #include "chrome/browser/ui/omnibox/omnibox_popup_model.h"
  26 #include "chrome/browser/ui/omnibox/omnibox_view.h"
  27 #include "chrome/browser/ui/search/search_ipc_router_policy_impl.h"
  28 #include "chrome/browser/ui/search/search_tab_helper_delegate.h"
  29 #include "chrome/browser/ui/tab_contents/core_tab_helper.h"
  30 #include "chrome/browser/ui/webui/ntp/ntp_user_data_logger.h"
  31 #include "chrome/common/url_constants.h"
  32 #include "components/signin/core/browser/signin_manager.h"
  33 #include "content/public/browser/navigation_controller.h"
  34 #include "content/public/browser/navigation_details.h"
  35 #include "content/public/browser/navigation_entry.h"
  36 #include "content/public/browser/navigation_type.h"
  37 #include "content/public/browser/notification_service.h"
  38 #include "content/public/browser/notification_source.h"
  39 #include "content/public/browser/render_process_host.h"
  40 #include "content/public/browser/user_metrics.h"
  41 #include "content/public/browser/web_contents.h"
  42 #include "content/public/common/page_transition_types.h"
  43 #include "content/public/common/referrer.h"
  44 #include "grit/generated_resources.h"
  45 #include "net/base/net_errors.h"
  46 #include "ui/base/l10n/l10n_util.h"
  47 #include "url/gurl.h"
  48
  49 DEFINE_WEB_CONTENTS_USER_DATA_KEY(SearchTabHelper);
  50
  51 namespace {
  52
  53 // For reporting Cacheable NTP navigations.
  54 enum CacheableNTPLoad {
  55   CACHEABLE_NTP_LOAD_FAILED = 0,
  56   CACHEABLE_NTP_LOAD_SUCCEEDED = 1,
  57   CACHEABLE_NTP_LOAD_MAX = 2
  58 };
  59
  60 void RecordCacheableNTPLoadHistogram(bool succeeded) {
  61   UMA_HISTOGRAM_ENUMERATION("InstantExtended.CacheableNTPLoad",
  62                             succeeded ? CACHEABLE_NTP_LOAD_SUCCEEDED :
  63                                 CACHEABLE_NTP_LOAD_FAILED,
  64                             CACHEABLE_NTP_LOAD_MAX);
  65 }
  66
  67 bool IsCacheableNTP(const content::WebContents* contents) {
  68   const content::NavigationEntry* entry =
  69       contents->GetController().GetLastCommittedEntry();
  70   return chrome::NavEntryIsInstantNTP(contents, entry) &&
  71       entry->GetURL() != GURL(chrome::kChromeSearchLocalNtpUrl);
  72 }
  73
  74 bool IsNTP(const content::WebContents* contents) {
  75   // We can't use WebContents::GetURL() because that uses the active entry,
  76   // whereas we want the visible entry.
  77   const content::NavigationEntry* entry =
  78       contents->GetController().GetVisibleEntry();
  79   if (entry && entry->GetVirtualURL() == GURL(chrome::kChromeUINewTabURL))
  80     return true;
  81
  82   return chrome::IsInstantNTP(contents);
  83 }
  84
  85 bool IsSearchResults(const content::WebContents* contents) {
  86   return !chrome::GetSearchTerms(contents).empty();
  87 }
  88
  89 bool IsLocal(const content::WebContents* contents) {
  90   if (!contents)
  91     return false;
  92   const content::NavigationEntry* entry =
  93       contents->GetController().GetVisibleEntry();
  94   return entry && entry->GetURL() == GURL(chrome::kChromeSearchLocalNtpUrl);
  95 }
  96
  97 // Returns true if |contents| are rendered inside an Instant process.
  98 bool InInstantProcess(Profile* profile,
  99                       const content::WebContents* contents) {
 100   if (!profile || !contents)
 101     return false;
 102
 103   InstantService* instant_service =
 104       InstantServiceFactory::GetForProfile(profile);
 105   return instant_service &&
 106       instant_service->IsInstantProcess(
 107           contents->GetRenderProcessHost()->GetID());
 108 }
 109
 110 // Called when an NTP finishes loading. If the load start time was noted,
 111 // calculates and logs the total load time.
 112 void RecordNewTabLoadTime(content::WebContents* contents) {
 113   CoreTabHelper* core_tab_helper = CoreTabHelper::FromWebContents(contents);
 114   if (core_tab_helper->new_tab_start_time().is_null())
 115     return;
 116
 117   base::TimeDelta duration =
 118       base::TimeTicks::Now() - core_tab_helper->new_tab_start_time();
 119   UMA_HISTOGRAM_TIMES("Tab.NewTabOnload", duration);
 120   core_tab_helper->set_new_tab_start_time(base::TimeTicks());
 121 }
 122
 123 }  // namespace
 124
 125 SearchTabHelper::SearchTabHelper(content::WebContents* web_contents)
 126     : WebContentsObserver(web_contents),
 127       is_search_enabled_(chrome::IsInstantExtendedAPIEnabled()),
 128       web_contents_(web_contents),
 129       ipc_router_(web_contents, this,
 130                   make_scoped_ptr(new SearchIPCRouterPolicyImpl(web_contents))
 131                       .PassAs<SearchIPCRouter::Policy>()),
 132       instant_service_(NULL),
 133       delegate_(NULL) {
 134   if (!is_search_enabled_)
 135     return;
 136
 137   instant_service_ =
 138       InstantServiceFactory::GetForProfile(
 139           Profile::FromBrowserContext(web_contents_->GetBrowserContext()));
 140   if (instant_service_)
 141     instant_service_->AddObserver(this);
 142 }
 143
 144 SearchTabHelper::~SearchTabHelper() {
 145   if (instant_service_)
 146     instant_service_->RemoveObserver(this);
 147 }
 148
 149 void SearchTabHelper::InitForPreloadedNTP() {
 150   UpdateMode(true, true);
 151 }
 152
 153 void SearchTabHelper::OmniboxInputStateChanged() {
 154   if (!is_search_enabled_)
 155     return;
 156
 157   UpdateMode(false, false);
 158 }
 159
 160 void SearchTabHelper::OmniboxFocusChanged(OmniboxFocusState state,
 161                                           OmniboxFocusChangeReason reason) {
 162   content::NotificationService::current()->Notify(
 163       chrome::NOTIFICATION_OMNIBOX_FOCUS_CHANGED,
 164       content::Source<SearchTabHelper>(this),
 165       content::NotificationService::NoDetails());
 166
 167   ipc_router_.OmniboxFocusChanged(state, reason);
 168
 169   // Don't send oninputstart/oninputend updates in response to focus changes
 170   // if there's a navigation in progress. This prevents Chrome from sending
 171   // a spurious oninputend when the user accepts a match in the omnibox.
 172   if (web_contents_->GetController().GetPendingEntry() == NULL) {
 173     ipc_router_.SetInputInProgress(IsInputInProgress());
 174   }
 175 }
 176
 177 void SearchTabHelper::NavigationEntryUpdated() {
 178   if (!is_search_enabled_)
 179     return;
 180
 181   UpdateMode(false, false);
 182 }
 183
 184 void SearchTabHelper::InstantSupportChanged(bool instant_support) {
 185   if (!is_search_enabled_)
 186     return;
 187
 188   InstantSupportState new_state = instant_support ? INSTANT_SUPPORT_YES :
 189       INSTANT_SUPPORT_NO;
 190
 191   model_.SetInstantSupportState(new_state);
 192
 193   content::NavigationEntry* entry =
 194       web_contents_->GetController().GetLastCommittedEntry();
 195   if (entry) {
 196     chrome::SetInstantSupportStateInNavigationEntry(new_state, entry);
 197     if (delegate_ && !instant_support)
 198       delegate_->OnWebContentsInstantSupportDisabled(web_contents_);
 199   }
 200 }
 201
 202 bool SearchTabHelper::SupportsInstant() const {
 203   return model_.instant_support() == INSTANT_SUPPORT_YES;
 204 }
 205
 206 void SearchTabHelper::SetSuggestionToPrefetch(
 207     const InstantSuggestion& suggestion) {
 208   ipc_router_.SetSuggestionToPrefetch(suggestion);
 209 }
 210
 211 void SearchTabHelper::Submit(const base::string16& text) {
 212   ipc_router_.Submit(text);
 213 }
 214
 215 void SearchTabHelper::OnTabActivated() {
 216   ipc_router_.OnTabActivated();
 217 }
 218
 219 void SearchTabHelper::OnTabDeactivated() {
 220   ipc_router_.OnTabDeactivated();
 221 }
 222
 223 void SearchTabHelper::ToggleVoiceSearch() {
 224   ipc_router_.ToggleVoiceSearch();
 225 }
 226
 227 bool SearchTabHelper::IsSearchResultsPage() {
 228   return model_.mode().is_origin_search();
 229 }
 230
 231 void SearchTabHelper::RenderViewCreated(
 232     content::RenderViewHost* render_view_host) {
 233   ipc_router_.SetPromoInformation(IsAppLauncherEnabled());
 234 }
 235
 236 void SearchTabHelper::DidStartNavigationToPendingEntry(
 237     const GURL& url,
 238     content::NavigationController::ReloadType /* reload_type */) {
 239   if (chrome::IsNTPURL(url, profile())) {
 240     // Set the title on any pending entry corresponding to the NTP. This
 241     // prevents any flickering of the tab title.
 242     content::NavigationEntry* entry =
 243         web_contents_->GetController().GetPendingEntry();
 244     if (entry)
 245       entry->SetTitle(l10n_util::GetStringUTF16(IDS_NEW_TAB_TITLE));
 246   }
 247 }
 248
 249 void SearchTabHelper::DidNavigateMainFrame(
 250     const content::LoadCommittedDetails& details,
 251     const content::FrameNavigateParams& params) {
 252   if (IsCacheableNTP(web_contents_)) {
 253     if (details.http_status_code == 204 || details.http_status_code >= 400) {
 254       RedirectToLocalNTP();
 255       RecordCacheableNTPLoadHistogram(false);
 256       return;
 257     }
 258     RecordCacheableNTPLoadHistogram(true);
 259   }
 260
 261   // Always set the title on the new tab page to be the one from our UI
 262   // resources. Normally, we set the title when we begin a NTP load, but it can
 263   // get reset in several places (like when you press Reload). This check
 264   // ensures that the title is properly set to the string defined by the Chrome
 265   // UI language (rather than the server language) in all cases.
 266   //
 267   // We only override the title when it's nonempty to allow the page to set the
 268   // title if it really wants. An empty title means to use the default. There's
 269   // also a race condition between this code and the page's SetTitle call which
 270   // this rule avoids.
 271   content::NavigationEntry* entry =
 272       web_contents_->GetController().GetLastCommittedEntry();
 273   if (entry && entry->GetTitle().empty() &&
 274       (entry->GetVirtualURL() == GURL(chrome::kChromeUINewTabURL) ||
 275        chrome::NavEntryIsInstantNTP(web_contents_, entry))) {
 276     entry->SetTitle(l10n_util::GetStringUTF16(IDS_NEW_TAB_TITLE));
 277   }
 278 }
 279
 280 void SearchTabHelper::DidFailProvisionalLoad(
 281     int64 /* frame_id */,
 282     const base::string16& /* frame_unique_name */,
 283     bool is_main_frame,
 284     const GURL& validated_url,
 285     int error_code,
 286     const base::string16& /* error_description */,
 287     content::RenderViewHost* /* render_view_host */) {
 288   // If error_code is ERR_ABORTED means that the user has canceled this
 289   // navigation so it shouldn't be redirected.
 290   if (is_main_frame &&
 291       error_code != net::ERR_ABORTED &&
 292       validated_url != GURL(chrome::kChromeSearchLocalNtpUrl) &&
 293       chrome::IsNTPURL(validated_url, profile())) {
 294     RedirectToLocalNTP();
 295     RecordCacheableNTPLoadHistogram(false);
 296   }
 297 }
 298
 299 void SearchTabHelper::DidFinishLoad(
 300     int64 /* frame_id */,
 301     const GURL&  /* validated_url */,
 302     bool is_main_frame,
 303     content::RenderViewHost* /* render_view_host */) {
 304   if (is_main_frame) {
 305     if (chrome::IsInstantNTP(web_contents_))
 306       RecordNewTabLoadTime(web_contents_);
 307
 308     DetermineIfPageSupportsInstant();
 309   }
 310 }
 311
 312 void SearchTabHelper::NavigationEntryCommitted(
 313     const content::LoadCommittedDetails& load_details) {
 314   if (!is_search_enabled_)
 315     return;
 316
 317   if (!load_details.is_main_frame)
 318     return;
 319
 320   if (chrome::ShouldAssignURLToInstantRenderer(web_contents_->GetURL(),
 321                                                profile())) {
 322     InstantService* instant_service =
 323         InstantServiceFactory::GetForProfile(profile());
 324     ipc_router_.SetOmniboxStartMargin(instant_service->omnibox_start_margin());
 325     ipc_router_.SetDisplayInstantResults();
 326   }
 327
 328   UpdateMode(true, false);
 329
 330   content::NavigationEntry* entry =
 331       web_contents_->GetController().GetVisibleEntry();
 332   DCHECK(entry);
 333
 334   // Already determined the instant support state for this page, do not reset
 335   // the instant support state.
 336   //
 337   // When we get a navigation entry committed event, there seem to be two ways
 338   // to tell whether the navigation was "in-page". Ideally, when
 339   // LoadCommittedDetails::is_in_page is true, we should have
 340   // LoadCommittedDetails::type to be NAVIGATION_TYPE_IN_PAGE. Unfortunately,
 341   // they are different in some cases. To workaround this bug, we are checking
 342   // (is_in_page || type == NAVIGATION_TYPE_IN_PAGE). Please refer to
 343   // crbug.com/251330 for more details.
 344   if (load_details.is_in_page ||
 345       load_details.type == content::NAVIGATION_TYPE_IN_PAGE) {
 346     // When an "in-page" navigation happens, we will not receive a
 347     // DidFinishLoad() event. Therefore, we will not determine the Instant
 348     // support for the navigated page. So, copy over the Instant support from
 349     // the previous entry. If the page does not support Instant, update the
 350     // location bar from here to turn off search terms replacement.
 351     chrome::SetInstantSupportStateInNavigationEntry(model_.instant_support(),
 352                                                     entry);
 353     if (delegate_ && model_.instant_support() == INSTANT_SUPPORT_NO)
 354       delegate_->OnWebContentsInstantSupportDisabled(web_contents_);
 355     return;
 356   }
 357
 358   model_.SetInstantSupportState(INSTANT_SUPPORT_UNKNOWN);
 359   model_.SetVoiceSearchSupported(false);
 360   chrome::SetInstantSupportStateInNavigationEntry(model_.instant_support(),
 361                                                   entry);
 362 }
 363
 364 void SearchTabHelper::OnInstantSupportDetermined(bool supports_instant) {
 365   InstantSupportChanged(supports_instant);
 366 }
 367
 368 void SearchTabHelper::OnSetVoiceSearchSupport(bool supports_voice_search) {
 369   model_.SetVoiceSearchSupported(supports_voice_search);
 370 }
 371
 372 void SearchTabHelper::ThemeInfoChanged(const ThemeBackgroundInfo& theme_info) {
 373   ipc_router_.SendThemeBackgroundInfo(theme_info);
 374 }
 375
 376 void SearchTabHelper::MostVisitedItemsChanged(
 377     const std::vector<InstantMostVisitedItem>& items) {
 378   std::vector<InstantMostVisitedItem> items_copy(items);
 379   MaybeRemoveMostVisitedItems(&items_copy);
 380   ipc_router_.SendMostVisitedItems(items_copy);
 381 }
 382
 383 void SearchTabHelper::OmniboxStartMarginChanged(int omnibox_start_margin) {
 384   ipc_router_.SetOmniboxStartMargin(omnibox_start_margin);
 385 }
 386
 387 void SearchTabHelper::MaybeRemoveMostVisitedItems(
 388     std::vector<InstantMostVisitedItem>* items) {
 389   if (!delegate_)
 390     return;
 391
 392   if (!history::MostVisitedTilesExperiment::IsDontShowOpenURLsEnabled())
 393     return;
 394
 395   history::MostVisitedTilesExperiment::RemoveItemsMatchingOpenTabs(
 396       delegate_->GetOpenUrls(), items);
 397 }
 398
 399 void SearchTabHelper::FocusOmnibox(OmniboxFocusState state) {
 400 // TODO(kmadhusu): Move platform specific code from here and get rid of #ifdef.
 401 #if !defined(OS_ANDROID)
 402   OmniboxView* omnibox = GetOmniboxView();
 403   if (!omnibox)
 404     return;
 405
 406   // Do not add a default case in the switch block for the following reasons:
 407   // (1) Explicitly handle the new states. If new states are added in the
 408   // OmniboxFocusState, the compiler will warn the developer to handle the new
 409   // states.
 410   // (2) An attacker may control the renderer and sends the browser process a
 411   // malformed IPC. This function responds to the invalid |state| values by
 412   // doing nothing instead of crashing the browser process (intentional no-op).
 413   switch (state) {
 414     case OMNIBOX_FOCUS_VISIBLE:
 415       omnibox->SetFocus();
 416       omnibox->model()->SetCaretVisibility(true);
 417       break;
 418     case OMNIBOX_FOCUS_INVISIBLE:
 419       omnibox->SetFocus();
 420       omnibox->model()->SetCaretVisibility(false);
 421       // If the user clicked on the fakebox, any text already in the omnibox
 422       // should get cleared when they start typing. Selecting all the existing
 423       // text is a convenient way to accomplish this. It also gives a slight
 424       // visual cue to users who really understand selection state about what
 425       // will happen if they start typing.
 426       omnibox->SelectAll(false);
 427       omnibox->ShowImeIfNeeded();
 428       break;
 429     case OMNIBOX_FOCUS_NONE:
 430       // Remove focus only if the popup is closed. This will prevent someone
 431       // from changing the omnibox value and closing the popup without user
 432       // interaction.
 433       if (!omnibox->model()->popup_model()->IsOpen())
 434         web_contents()->Focus();
 435       break;
 436   }
 437 #endif
 438 }
 439
 440 void SearchTabHelper::NavigateToURL(const GURL& url,
 441                                     WindowOpenDisposition disposition,
 442                                     bool is_most_visited_item_url) {
 443   if (is_most_visited_item_url) {
 444     content::RecordAction(
 445         base::UserMetricsAction("InstantExtended.MostVisitedClicked"));
 446   }
 447
 448   if (delegate_)
 449     delegate_->NavigateOnThumbnailClick(url, disposition, web_contents_);
 450 }
 451
 452 void SearchTabHelper::OnDeleteMostVisitedItem(const GURL& url) {
 453   DCHECK(!url.is_empty());
 454   if (instant_service_)
 455     instant_service_->DeleteMostVisitedItem(url);
 456 }
 457
 458 void SearchTabHelper::OnUndoMostVisitedDeletion(const GURL& url) {
 459   DCHECK(!url.is_empty());
 460   if (instant_service_)
 461     instant_service_->UndoMostVisitedDeletion(url);
 462 }
 463
 464 void SearchTabHelper::OnUndoAllMostVisitedDeletions() {
 465   if (instant_service_)
 466     instant_service_->UndoAllMostVisitedDeletions();
 467 }
 468
 469 void SearchTabHelper::OnLogEvent(NTPLoggingEventType event) {
 470 // TODO(kmadhusu): Move platform specific code from here and get rid of #ifdef.
 471 #if !defined(OS_ANDROID)
 472   NTPUserDataLogger::GetOrCreateFromWebContents(
 473       web_contents())->LogEvent(event);
 474 #endif
 475 }
 476
 477 void SearchTabHelper::OnLogMostVisitedImpression(
 478     int position, const base::string16& provider) {
 479 // TODO(kmadhusu): Move platform specific code from here and get rid of #ifdef.
 480 #if !defined(OS_ANDROID)
 481   NTPUserDataLogger::GetOrCreateFromWebContents(
 482       web_contents())->LogMostVisitedImpression(position, provider);
 483 #endif
 484 }
 485
 486 void SearchTabHelper::OnLogMostVisitedNavigation(
 487     int position, const base::string16& provider) {
 488 // TODO(kmadhusu): Move platform specific code from here and get rid of #ifdef.
 489 #if !defined(OS_ANDROID)
 490   NTPUserDataLogger::GetOrCreateFromWebContents(
 491       web_contents())->LogMostVisitedNavigation(position, provider);
 492 #endif
 493 }
 494
 495 void SearchTabHelper::PasteIntoOmnibox(const base::string16& text) {
 496 // TODO(kmadhusu): Move platform specific code from here and get rid of #ifdef.
 497 #if !defined(OS_ANDROID)
 498   OmniboxView* omnibox = GetOmniboxView();
 499   if (!omnibox)
 500     return;
 501   // The first case is for right click to paste, where the text is retrieved
 502   // from the clipboard already sanitized. The second case is needed to handle
 503   // drag-and-drop value and it has to be sanitazed before setting it into the
 504   // omnibox.
 505   base::string16 text_to_paste = text.empty() ? omnibox->GetClipboardText() :
 506       omnibox->SanitizeTextForPaste(text);
 507
 508   if (text_to_paste.empty())
 509     return;
 510
 511   if (!omnibox->model()->has_focus())
 512     omnibox->SetFocus();
 513
 514   omnibox->OnBeforePossibleChange();
 515   omnibox->model()->OnPaste();
 516   omnibox->SetUserText(text_to_paste);
 517   omnibox->OnAfterPossibleChange();
 518 #endif
 519 }
 520
 521 void SearchTabHelper::OnChromeIdentityCheck(const base::string16& identity) {
 522   SigninManagerBase* manager = SigninManagerFactory::GetForProfile(profile());
 523   if (manager) {
 524     const base::string16 username =
 525         base::UTF8ToUTF16(manager->GetAuthenticatedUsername());
 526     ipc_router_.SendChromeIdentityCheckResult(identity,
 527                                               identity == username);
 528   }
 529 }
 530
 531 void SearchTabHelper::UpdateMode(bool update_origin, bool is_preloaded_ntp) {
 532   SearchMode::Type type = SearchMode::MODE_DEFAULT;
 533   SearchMode::Origin origin = SearchMode::ORIGIN_DEFAULT;
 534   if (IsNTP(web_contents_) || is_preloaded_ntp) {
 535     type = SearchMode::MODE_NTP;
 536     origin = SearchMode::ORIGIN_NTP;
 537   } else if (IsSearchResults(web_contents_)) {
 538     type = SearchMode::MODE_SEARCH_RESULTS;
 539     origin = SearchMode::ORIGIN_SEARCH;
 540   }
 541   if (!update_origin)
 542     origin = model_.mode().origin;
 543
 544   OmniboxView* omnibox = GetOmniboxView();
 545   if (omnibox && omnibox->model()->user_input_in_progress())
 546     type = SearchMode::MODE_SEARCH_SUGGESTIONS;
 547
 548   SearchMode old_mode(model_.mode());
 549   model_.SetMode(SearchMode(type, origin));
 550   if (old_mode.is_ntp() != model_.mode().is_ntp()) {
 551     ipc_router_.SetInputInProgress(IsInputInProgress());
 552   }
 553 }
 554
 555 void SearchTabHelper::DetermineIfPageSupportsInstant() {
 556   if (!InInstantProcess(profile(), web_contents_)) {
 557     // The page is not in the Instant process. This page does not support
 558     // instant. If we send an IPC message to a page that is not in the Instant
 559     // process, it will never receive it and will never respond. Therefore,
 560     // return immediately.
 561     InstantSupportChanged(false);
 562   } else if (IsLocal(web_contents_)) {
 563     // Local pages always support Instant.
 564     InstantSupportChanged(true);
 565   } else {
 566     ipc_router_.DetermineIfPageSupportsInstant();
 567   }
 568 }
 569
 570 Profile* SearchTabHelper::profile() const {
 571   return Profile::FromBrowserContext(web_contents_->GetBrowserContext());
 572 }
 573
 574 void SearchTabHelper::RedirectToLocalNTP() {
 575   // Extra parentheses to declare a variable.
 576   content::NavigationController::LoadURLParams load_params(
 577       (GURL(chrome::kChromeSearchLocalNtpUrl)));
 578   load_params.referrer = content::Referrer();
 579   load_params.transition_type = content::PAGE_TRANSITION_SERVER_REDIRECT;
 580   // Don't push a history entry.
 581   load_params.should_replace_current_entry = true;
 582   web_contents_->GetController().LoadURLWithParams(load_params);
 583 }
 584
 585 bool SearchTabHelper::IsInputInProgress() const {
 586   OmniboxView* omnibox = GetOmniboxView();
 587   return !model_.mode().is_ntp() && omnibox &&
 588       omnibox->model()->focus_state() == OMNIBOX_FOCUS_VISIBLE;
 589 }
 590
 591 OmniboxView* SearchTabHelper::GetOmniboxView() const {
 592   return delegate_ ? delegate_->GetOmniboxView() : NULL;
 593 }