chrome/browser/themes/theme_service.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 #include "chrome/browser/themes/theme_service.h"
   6
   7 #include <algorithm>
   8
   9 #include "base/bind.h"
  10 #include "base/memory/ref_counted_memory.h"
  11 #include "base/message_loop/message_loop.h"
  12 #include "base/prefs/pref_service.h"
  13 #include "base/sequenced_task_runner.h"
  14 #include "base/strings/string_util.h"
  15 #include "base/strings/utf_string_conversions.h"
  16 #include "chrome/browser/chrome_notification_types.h"
  17 #include "chrome/browser/extensions/extension_service.h"
  18 #include "chrome/browser/profiles/profile.h"
  19 #include "chrome/browser/themes/browser_theme_pack.h"
  20 #include "chrome/browser/themes/custom_theme_supplier.h"
  21 #include "chrome/browser/themes/theme_properties.h"
  22 #include "chrome/browser/themes/theme_syncable_service.h"
  23 #include "chrome/common/chrome_constants.h"
  24 #include "chrome/common/pref_names.h"
  25 #include "content/public/browser/notification_service.h"
  26 #include "content/public/browser/user_metrics.h"
  27 #include "extensions/browser/extension_prefs.h"
  28 #include "extensions/browser/extension_registry.h"
  29 #include "extensions/browser/extension_system.h"
  30 #include "extensions/browser/uninstall_reason.h"
  31 #include "extensions/common/extension.h"
  32 #include "extensions/common/extension_set.h"
  33 #include "grit/theme_resources.h"
  34 #include "ui/base/layout.h"
  35 #include "ui/base/resource/resource_bundle.h"
  36 #include "ui/gfx/image/image_skia.h"
  37
  38 #if defined(ENABLE_EXTENSIONS)
  39 #include "extensions/browser/extension_registry_observer.h"
  40 #endif
  41
  42 #if defined(ENABLE_SUPERVISED_USERS)
  43 #include "chrome/browser/supervised_user/supervised_user_theme.h"
  44 #endif
  45
  46 #if defined(OS_WIN)
  47 #include "ui/base/win/shell.h"
  48 #endif
  49
  50 using base::UserMetricsAction;
  51 using content::BrowserThread;
  52 using extensions::Extension;
  53 using extensions::UnloadedExtensionInfo;
  54 using ui::ResourceBundle;
  55
  56 typedef ThemeProperties Properties;
  57
  58 // The default theme if we haven't installed a theme yet or if we've clicked
  59 // the "Use Classic" button.
  60 const char* ThemeService::kDefaultThemeID = "";
  61
  62 namespace {
  63
  64 // The default theme if we've gone to the theme gallery and installed the
  65 // "Default" theme. We have to detect this case specifically. (By the time we
  66 // realize we've installed the default theme, we already have an extension
  67 // unpacked on the filesystem.)
  68 const char* kDefaultThemeGalleryID = "hkacjpbfdknhflllbcmjibkdeoafencn";
  69
  70 // Wait this many seconds after startup to garbage collect unused themes.
  71 // Removing unused themes is done after a delay because there is no
  72 // reason to do it at startup.
  73 // ExtensionService::GarbageCollectExtensions() does something similar.
  74 const int kRemoveUnusedThemesStartupDelay = 30;
  75
  76 SkColor IncreaseLightness(SkColor color, double percent) {
  77   color_utils::HSL result;
  78   color_utils::SkColorToHSL(color, &result);
  79   result.l += (1 - result.l) * percent;
  80   return color_utils::HSLToSkColor(result, SkColorGetA(color));
  81 }
  82
  83 // Writes the theme pack to disk on a separate thread.
  84 void WritePackToDiskCallback(BrowserThemePack* pack,
  85                              const base::FilePath& path) {
  86   if (!pack->WriteToDisk(path))
  87     NOTREACHED() << "Could not write theme pack to disk";
  88 }
  89
  90 // Heuristic to determine if color is grayscale. This is used to decide whether
  91 // to use the colorful or white logo, if a theme fails to specify which.
  92 bool IsColorGrayscale(SkColor color) {
  93   const int kChannelTolerance = 9;
  94   int r = SkColorGetR(color);
  95   int g = SkColorGetG(color);
  96   int b = SkColorGetB(color);
  97   int range = std::max(r, std::max(g, b)) - std::min(r, std::min(g, b));
  98   return range < kChannelTolerance;
  99 }
 100
 101 }  // namespace
 102
 103 #if defined(ENABLE_EXTENSIONS)
 104 class ThemeService::ThemeObserver
 105     : public extensions::ExtensionRegistryObserver {
 106  public:
 107   explicit ThemeObserver(ThemeService* service) : theme_service_(service) {
 108     extensions::ExtensionRegistry::Get(theme_service_->profile_)
 109         ->AddObserver(this);
 110   }
 111
 112   ~ThemeObserver() override {
 113     extensions::ExtensionRegistry::Get(theme_service_->profile_)
 114         ->RemoveObserver(this);
 115   }
 116
 117  private:
 118   void OnExtensionWillBeInstalled(content::BrowserContext* browser_context,
 119                                   const extensions::Extension* extension,
 120                                   bool is_update,
 121                                   bool from_ephemeral,
 122                                   const std::string& old_name) override {
 123     if (extension->is_theme()) {
 124       // The theme may be initially disabled. Wait till it is loaded (if ever).
 125       theme_service_->installed_pending_load_id_ = extension->id();
 126     }
 127   }
 128
 129   void OnExtensionLoaded(content::BrowserContext* browser_context,
 130                          const extensions::Extension* extension) override {
 131     if (extension->is_theme() &&
 132         theme_service_->installed_pending_load_id_ != kDefaultThemeID &&
 133         theme_service_->installed_pending_load_id_ == extension->id()) {
 134       theme_service_->SetTheme(extension);
 135     }
 136     theme_service_->installed_pending_load_id_ = kDefaultThemeID;
 137   }
 138
 139   void OnExtensionUnloaded(
 140       content::BrowserContext* browser_context,
 141       const extensions::Extension* extension,
 142       extensions::UnloadedExtensionInfo::Reason reason) override {
 143     if (reason != extensions::UnloadedExtensionInfo::REASON_UPDATE &&
 144         reason != extensions::UnloadedExtensionInfo::REASON_LOCK_ALL &&
 145         extension->is_theme() &&
 146         extension->id() == theme_service_->GetThemeID()) {
 147       theme_service_->UseDefaultTheme();
 148     }
 149   }
 150
 151   ThemeService* theme_service_;
 152 };
 153 #endif  // defined(ENABLE_EXTENSIONS)
 154
 155 ThemeService::ThemeService()
 156     : ready_(false),
 157       rb_(ResourceBundle::GetSharedInstance()),
 158       profile_(nullptr),
 159       installed_pending_load_id_(kDefaultThemeID),
 160       number_of_infobars_(0),
 161       weak_ptr_factory_(this) {
 162 }
 163
 164 ThemeService::~ThemeService() {
 165   FreePlatformCaches();
 166 }
 167
 168 void ThemeService::Init(Profile* profile) {
 169   DCHECK(CalledOnValidThread());
 170   profile_ = profile;
 171
 172   LoadThemePrefs();
 173
 174   registrar_.Add(this,
 175                  extensions::NOTIFICATION_EXTENSIONS_READY_DEPRECATED,
 176                  content::Source<Profile>(profile_));
 177
 178   theme_syncable_service_.reset(new ThemeSyncableService(profile_, this));
 179 }
 180
 181 gfx::Image ThemeService::GetImageNamed(int id) const {
 182   DCHECK(CalledOnValidThread());
 183
 184   gfx::Image image;
 185   if (theme_supplier_.get())
 186     image = theme_supplier_->GetImageNamed(id);
 187
 188   if (image.IsEmpty())
 189     image = rb_.GetNativeImageNamed(id);
 190
 191   return image;
 192 }
 193
 194 bool ThemeService::IsSystemThemeDistinctFromDefaultTheme() const {
 195   return false;
 196 }
 197
 198 bool ThemeService::UsingSystemTheme() const {
 199   return UsingDefaultTheme();
 200 }
 201
 202 gfx::ImageSkia* ThemeService::GetImageSkiaNamed(int id) const {
 203   gfx::Image image = GetImageNamed(id);
 204   if (image.IsEmpty())
 205     return nullptr;
 206   // TODO(pkotwicz): Remove this const cast.  The gfx::Image interface returns
 207   // its images const. GetImageSkiaNamed() also should but has many callsites.
 208   return const_cast<gfx::ImageSkia*>(image.ToImageSkia());
 209 }
 210
 211 SkColor ThemeService::GetColor(int id) const {
 212   DCHECK(CalledOnValidThread());
 213   SkColor color;
 214   if (theme_supplier_.get() && theme_supplier_->GetColor(id, &color))
 215     return color;
 216
 217   // For backward compat with older themes, some newer colors are generated from
 218   // older ones if they are missing.
 219   switch (id) {
 220     case Properties::COLOR_NTP_SECTION_HEADER_TEXT:
 221       return IncreaseLightness(GetColor(Properties::COLOR_NTP_TEXT), 0.30);
 222     case Properties::COLOR_NTP_SECTION_HEADER_TEXT_HOVER:
 223       return GetColor(Properties::COLOR_NTP_TEXT);
 224     case Properties::COLOR_NTP_SECTION_HEADER_RULE:
 225       return IncreaseLightness(GetColor(Properties::COLOR_NTP_TEXT), 0.70);
 226     case Properties::COLOR_NTP_SECTION_HEADER_RULE_LIGHT:
 227       return IncreaseLightness(GetColor(Properties::COLOR_NTP_TEXT), 0.86);
 228     case Properties::COLOR_NTP_TEXT_LIGHT:
 229       return IncreaseLightness(GetColor(Properties::COLOR_NTP_TEXT), 0.40);
 230 #if defined(ENABLE_SUPERVISED_USERS)
 231     case Properties::COLOR_SUPERVISED_USER_LABEL:
 232       return color_utils::GetReadableColor(
 233           SK_ColorWHITE,
 234           GetColor(Properties::COLOR_SUPERVISED_USER_LABEL_BACKGROUND));
 235     case Properties::COLOR_SUPERVISED_USER_LABEL_BACKGROUND:
 236       return color_utils::BlendTowardOppositeLuminance(
 237           GetColor(Properties::COLOR_FRAME), 0x80);
 238     case Properties::COLOR_SUPERVISED_USER_LABEL_BORDER:
 239       return color_utils::AlphaBlend(
 240           GetColor(Properties::COLOR_SUPERVISED_USER_LABEL_BACKGROUND),
 241           SK_ColorBLACK,
 242           230);
 243 #endif
 244     case Properties::COLOR_STATUS_BAR_TEXT: {
 245       // A long time ago, we blended the toolbar and the tab text together to
 246       // get the status bar text because, at the time, our text rendering in
 247       // views couldn't do alpha blending. Even though this is no longer the
 248       // case, this blending decision is built into the majority of themes that
 249       // exist, and we must keep doing it.
 250       SkColor toolbar_color = GetColor(Properties::COLOR_TOOLBAR);
 251       SkColor text_color = GetColor(Properties::COLOR_TAB_TEXT);
 252       return SkColorSetARGB(
 253           SkColorGetA(text_color),
 254           (SkColorGetR(text_color) + SkColorGetR(toolbar_color)) / 2,
 255           (SkColorGetG(text_color) + SkColorGetR(toolbar_color)) / 2,
 256           (SkColorGetB(text_color) + SkColorGetR(toolbar_color)) / 2);
 257     }
 258   }
 259
 260   return Properties::GetDefaultColor(id);
 261 }
 262
 263 int ThemeService::GetDisplayProperty(int id) const {
 264   int result = 0;
 265   if (theme_supplier_.get() &&
 266       theme_supplier_->GetDisplayProperty(id, &result)) {
 267     return result;
 268   }
 269
 270   if (id == Properties::NTP_LOGO_ALTERNATE) {
 271     if (UsingDefaultTheme() || UsingSystemTheme())
 272       return 0;  // Colorful logo.
 273
 274     if (HasCustomImage(IDR_THEME_NTP_BACKGROUND))
 275       return 1;  // White logo.
 276
 277     SkColor background_color = GetColor(Properties::COLOR_NTP_BACKGROUND);
 278     return IsColorGrayscale(background_color) ? 0 : 1;
 279   }
 280
 281   return Properties::GetDefaultDisplayProperty(id);
 282 }
 283
 284 bool ThemeService::ShouldUseNativeFrame() const {
 285   if (HasCustomImage(IDR_THEME_FRAME))
 286     return false;
 287 #if defined(OS_WIN)
 288   return ui::win::IsAeroGlassEnabled();
 289 #else
 290   return false;
 291 #endif
 292 }
 293
 294 bool ThemeService::HasCustomImage(int id) const {
 295   return BrowserThemePack::IsPersistentImageID(id) &&
 296       theme_supplier_ && theme_supplier_->HasCustomImage(id);
 297 }
 298
 299 base::RefCountedMemory* ThemeService::GetRawData(
 300     int id,
 301     ui::ScaleFactor scale_factor) const {
 302   // Check to see whether we should substitute some images.
 303   int ntp_alternate = GetDisplayProperty(Properties::NTP_LOGO_ALTERNATE);
 304   if (id == IDR_PRODUCT_LOGO && ntp_alternate != 0)
 305     id = IDR_PRODUCT_LOGO_WHITE;
 306
 307   base::RefCountedMemory* data = nullptr;
 308   if (theme_supplier_.get())
 309     data = theme_supplier_->GetRawData(id, scale_factor);
 310   if (!data)
 311     data = rb_.LoadDataResourceBytesForScale(id, ui::SCALE_FACTOR_100P);
 312
 313   return data;
 314 }
 315
 316 void ThemeService::Shutdown() {
 317 #if defined(ENABLE_EXTENSIONS)
 318   theme_observer_.reset();
 319 #endif
 320 }
 321
 322 void ThemeService::Observe(int type,
 323                            const content::NotificationSource& source,
 324                            const content::NotificationDetails& details) {
 325   using content::Details;
 326   switch (type) {
 327     case extensions::NOTIFICATION_EXTENSIONS_READY_DEPRECATED:
 328       registrar_.Remove(this,
 329                         extensions::NOTIFICATION_EXTENSIONS_READY_DEPRECATED,
 330                         content::Source<Profile>(profile_));
 331       OnExtensionServiceReady();
 332       break;
 333     case extensions::NOTIFICATION_EXTENSION_ENABLED: {
 334       const Extension* extension = Details<const Extension>(details).ptr();
 335       if (extension->is_theme())
 336         SetTheme(extension);
 337       break;
 338     }
 339     default:
 340       NOTREACHED();
 341   }
 342 }
 343
 344 void ThemeService::SetTheme(const Extension* extension) {
 345   DCHECK(extension->is_theme());
 346   ExtensionService* service =
 347       extensions::ExtensionSystem::Get(profile_)->extension_service();
 348   if (!service->IsExtensionEnabled(extension->id())) {
 349     // |extension| is disabled when reverting to the previous theme via an
 350     // infobar.
 351     service->EnableExtension(extension->id());
 352     // Enabling the extension will call back to SetTheme().
 353     return;
 354   }
 355
 356   std::string previous_theme_id = GetThemeID();
 357
 358   // Clear our image cache.
 359   FreePlatformCaches();
 360
 361   BuildFromExtension(extension);
 362   SaveThemeID(extension->id());
 363
 364   NotifyThemeChanged();
 365   content::RecordAction(UserMetricsAction("Themes_Installed"));
 366
 367   if (previous_theme_id != kDefaultThemeID &&
 368       previous_theme_id != extension->id()) {
 369     // Disable the old theme.
 370     service->DisableExtension(previous_theme_id,
 371                               extensions::Extension::DISABLE_USER_ACTION);
 372   }
 373 }
 374
 375 void ThemeService::SetCustomDefaultTheme(
 376     scoped_refptr<CustomThemeSupplier> theme_supplier) {
 377   ClearAllThemeData();
 378   SwapThemeSupplier(theme_supplier);
 379   NotifyThemeChanged();
 380 }
 381
 382 bool ThemeService::ShouldInitWithSystemTheme() const {
 383   return false;
 384 }
 385
 386 void ThemeService::RemoveUnusedThemes(bool ignore_infobars) {
 387   // We do not want to garbage collect themes on startup (|ready_| is false).
 388   // Themes will get garbage collected after |kRemoveUnusedThemesStartupDelay|.
 389   if (!profile_ || !ready_)
 390     return;
 391   if (!ignore_infobars && number_of_infobars_ != 0)
 392     return;
 393
 394   ExtensionService* service =
 395       extensions::ExtensionSystem::Get(profile_)->extension_service();
 396   if (!service)
 397     return;
 398
 399   std::string current_theme = GetThemeID();
 400   std::vector<std::string> remove_list;
 401   scoped_ptr<const extensions::ExtensionSet> extensions(
 402       extensions::ExtensionRegistry::Get(profile_)
 403           ->GenerateInstalledExtensionsSet());
 404   extensions::ExtensionPrefs* prefs = extensions::ExtensionPrefs::Get(profile_);
 405   for (extensions::ExtensionSet::const_iterator it = extensions->begin();
 406        it != extensions->end(); ++it) {
 407     const extensions::Extension* extension = it->get();
 408     if (extension->is_theme() &&
 409         extension->id() != current_theme) {
 410       // Only uninstall themes which are not disabled or are disabled with
 411       // reason DISABLE_USER_ACTION. We cannot blanket uninstall all disabled
 412       // themes because externally installed themes are initially disabled.
 413       int disable_reason = prefs->GetDisableReasons(extension->id());
 414       if (!prefs->IsExtensionDisabled(extension->id()) ||
 415           disable_reason == Extension::DISABLE_USER_ACTION) {
 416         remove_list.push_back((*it)->id());
 417       }
 418     }
 419   }
 420   // TODO: Garbage collect all unused themes. This method misses themes which
 421   // are installed but not loaded because they are blacklisted by a management
 422   // policy provider.
 423
 424   for (size_t i = 0; i < remove_list.size(); ++i) {
 425     service->UninstallExtension(remove_list[i],
 426                                 extensions::UNINSTALL_REASON_ORPHANED_THEME,
 427                                 base::Bind(&base::DoNothing), nullptr);
 428   }
 429 }
 430
 431 void ThemeService::UseDefaultTheme() {
 432   if (ready_)
 433     content::RecordAction(UserMetricsAction("Themes_Reset"));
 434 #if defined(ENABLE_SUPERVISED_USERS)
 435   if (IsSupervisedUser()) {
 436     SetSupervisedUserTheme();
 437     return;
 438   }
 439 #endif
 440   ClearAllThemeData();
 441   NotifyThemeChanged();
 442 }
 443
 444 void ThemeService::UseSystemTheme() {
 445   UseDefaultTheme();
 446 }
 447
 448 bool ThemeService::UsingDefaultTheme() const {
 449   std::string id = GetThemeID();
 450   return id == ThemeService::kDefaultThemeID ||
 451       id == kDefaultThemeGalleryID;
 452 }
 453
 454 std::string ThemeService::GetThemeID() const {
 455   return profile_->GetPrefs()->GetString(prefs::kCurrentThemeID);
 456 }
 457
 458 color_utils::HSL ThemeService::GetTint(int id) const {
 459   DCHECK(CalledOnValidThread());
 460
 461   color_utils::HSL hsl;
 462   if (theme_supplier_.get() && theme_supplier_->GetTint(id, &hsl))
 463     return hsl;
 464
 465   return ThemeProperties::GetDefaultTint(id);
 466 }
 467
 468 void ThemeService::ClearAllThemeData() {
 469   if (!ready_)
 470     return;
 471
 472   SwapThemeSupplier(nullptr);
 473
 474   // Clear our image cache.
 475   FreePlatformCaches();
 476
 477   profile_->GetPrefs()->ClearPref(prefs::kCurrentThemePackFilename);
 478   SaveThemeID(kDefaultThemeID);
 479
 480   // There should be no more infobars. This may not be the case because of
 481   // http://crbug.com/62154
 482   // RemoveUnusedThemes is called on a task because ClearAllThemeData() may
 483   // be called as a result of NOTIFICATION_EXTENSION_UNLOADED_DEPRECATED.
 484   base::MessageLoop::current()->PostTask(FROM_HERE,
 485       base::Bind(&ThemeService::RemoveUnusedThemes,
 486                  weak_ptr_factory_.GetWeakPtr(),
 487                  true));
 488 }
 489
 490 void ThemeService::LoadThemePrefs() {
 491   PrefService* prefs = profile_->GetPrefs();
 492
 493   std::string current_id = GetThemeID();
 494   if (current_id == kDefaultThemeID) {
 495 #if defined(ENABLE_SUPERVISED_USERS)
 496     // Supervised users have a different default theme.
 497     if (IsSupervisedUser()) {
 498       SetSupervisedUserTheme();
 499       set_ready();
 500       return;
 501     }
 502 #endif
 503     if (ShouldInitWithSystemTheme())
 504       UseSystemTheme();
 505     else
 506       UseDefaultTheme();
 507     set_ready();
 508     return;
 509   }
 510
 511   bool loaded_pack = false;
 512
 513   // If we don't have a file pack, we're updating from an old version.
 514   base::FilePath path = prefs->GetFilePath(prefs::kCurrentThemePackFilename);
 515   if (path != base::FilePath()) {
 516     SwapThemeSupplier(BrowserThemePack::BuildFromDataPack(path, current_id));
 517     loaded_pack = theme_supplier_.get() != nullptr;
 518   }
 519
 520   if (loaded_pack) {
 521     content::RecordAction(UserMetricsAction("Themes.Loaded"));
 522     set_ready();
 523   }
 524   // Else: wait for the extension service to be ready so that the theme pack
 525   // can be recreated from the extension.
 526 }
 527
 528 void ThemeService::NotifyThemeChanged() {
 529   if (!ready_)
 530     return;
 531
 532   DVLOG(1) << "Sending BROWSER_THEME_CHANGED";
 533   // Redraw!
 534   content::NotificationService* service =
 535       content::NotificationService::current();
 536   service->Notify(chrome::NOTIFICATION_BROWSER_THEME_CHANGED,
 537                   content::Source<ThemeService>(this),
 538                   content::NotificationService::NoDetails());
 539 #if defined(OS_MACOSX)
 540   NotifyPlatformThemeChanged();
 541 #endif  // OS_MACOSX
 542
 543   // Notify sync that theme has changed.
 544   if (theme_syncable_service_.get()) {
 545     theme_syncable_service_->OnThemeChange();
 546   }
 547 }
 548
 549 #if defined(USE_AURA)
 550 void ThemeService::FreePlatformCaches() {
 551   // Views (Skia) has no platform image cache to clear.
 552 }
 553 #endif
 554
 555 void ThemeService::OnExtensionServiceReady() {
 556   if (!ready_) {
 557     // If the ThemeService is not ready yet, the custom theme data pack needs to
 558     // be recreated from the extension.
 559     MigrateTheme();
 560     set_ready();
 561
 562     // Send notification in case anyone requested data and cached it when the
 563     // theme service was not ready yet.
 564     NotifyThemeChanged();
 565   }
 566
 567 #if defined(ENABLE_EXTENSIONS)
 568   theme_observer_.reset(new ThemeObserver(this));
 569 #endif
 570
 571   registrar_.Add(this,
 572                  extensions::NOTIFICATION_EXTENSION_ENABLED,
 573                  content::Source<Profile>(profile_));
 574
 575   base::MessageLoop::current()->PostDelayedTask(FROM_HERE,
 576       base::Bind(&ThemeService::RemoveUnusedThemes,
 577                  weak_ptr_factory_.GetWeakPtr(),
 578                  false),
 579       base::TimeDelta::FromSeconds(kRemoveUnusedThemesStartupDelay));
 580 }
 581
 582 void ThemeService::MigrateTheme() {
 583   // TODO(erg): We need to pop up a dialog informing the user that their
 584   // theme is being migrated.
 585   ExtensionService* service =
 586       extensions::ExtensionSystem::Get(profile_)->extension_service();
 587   const Extension* extension =
 588       service ? service->GetExtensionById(GetThemeID(), false) : nullptr;
 589   if (extension) {
 590     DLOG(ERROR) << "Migrating theme";
 591     BuildFromExtension(extension);
 592     content::RecordAction(UserMetricsAction("Themes.Migrated"));
 593   } else {
 594     DLOG(ERROR) << "Theme is mysteriously gone.";
 595     ClearAllThemeData();
 596     content::RecordAction(UserMetricsAction("Themes.Gone"));
 597   }
 598 }
 599
 600 void ThemeService::SwapThemeSupplier(
 601     scoped_refptr<CustomThemeSupplier> theme_supplier) {
 602   if (theme_supplier_.get())
 603     theme_supplier_->StopUsingTheme();
 604   theme_supplier_ = theme_supplier;
 605   if (theme_supplier_.get())
 606     theme_supplier_->StartUsingTheme();
 607 }
 608
 609 void ThemeService::SavePackName(const base::FilePath& pack_path) {
 610   profile_->GetPrefs()->SetFilePath(
 611       prefs::kCurrentThemePackFilename, pack_path);
 612 }
 613
 614 void ThemeService::SaveThemeID(const std::string& id) {
 615   profile_->GetPrefs()->SetString(prefs::kCurrentThemeID, id);
 616 }
 617
 618 void ThemeService::BuildFromExtension(const Extension* extension) {
 619   scoped_refptr<BrowserThemePack> pack(
 620       BrowserThemePack::BuildFromExtension(extension));
 621   if (!pack.get()) {
 622     // TODO(erg): We've failed to install the theme; perhaps we should tell the
 623     // user? http://crbug.com/34780
 624     LOG(ERROR) << "Could not load theme.";
 625     return;
 626   }
 627
 628   ExtensionService* service =
 629       extensions::ExtensionSystem::Get(profile_)->extension_service();
 630   if (!service)
 631     return;
 632
 633   // Write the packed file to disk.
 634   base::FilePath pack_path =
 635       extension->path().Append(chrome::kThemePackFilename);
 636   service->GetFileTaskRunner()->PostTask(
 637       FROM_HERE,
 638       base::Bind(&WritePackToDiskCallback, pack, pack_path));
 639
 640   SavePackName(pack_path);
 641   SwapThemeSupplier(pack);
 642 }
 643
 644 #if defined(ENABLE_SUPERVISED_USERS)
 645 bool ThemeService::IsSupervisedUser() const {
 646   return profile_->IsSupervised();
 647 }
 648
 649 void ThemeService::SetSupervisedUserTheme() {
 650   SetCustomDefaultTheme(new SupervisedUserTheme);
 651 }
 652 #endif
 653
 654 void ThemeService::OnInfobarDisplayed() {
 655   number_of_infobars_++;
 656 }
 657
 658 void ThemeService::OnInfobarDestroyed() {
 659   number_of_infobars_--;
 660
 661   if (number_of_infobars_ == 0)
 662     RemoveUnusedThemes(false);
 663 }
 664
 665 ThemeSyncableService* ThemeService::GetThemeSyncableService() const {
 666   return theme_syncable_service_.get();
 667 }