src/chrome/browser/background/background_contents_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/background/background_contents_service.h"
   6
   7 #include "apps/app_load_service.h"
   8 #include "base/basictypes.h"
   9 #include "base/bind.h"
  10 #include "base/command_line.h"
  11 #include "base/compiler_specific.h"
  12 #include "base/message_loop/message_loop.h"
  13 #include "base/prefs/pref_service.h"
  14 #include "base/prefs/scoped_user_pref_update.h"
  15 #include "base/strings/string_util.h"
  16 #include "base/strings/utf_string_conversions.h"
  17 #include "base/time/time.h"
  18 #include "base/values.h"
  19 #include "chrome/browser/background/background_contents_service_factory.h"
  20 #include "chrome/browser/browser_process.h"
  21 #include "chrome/browser/chrome_notification_types.h"
  22 #include "chrome/browser/extensions/extension_host.h"
  23 #include "chrome/browser/extensions/extension_service.h"
  24 #include "chrome/browser/extensions/image_loader.h"
  25 #include "chrome/browser/notifications/desktop_notification_service.h"
  26 #include "chrome/browser/notifications/notification.h"
  27 #include "chrome/browser/notifications/notification_delegate.h"
  28 #include "chrome/browser/notifications/notification_ui_manager.h"
  29 #include "chrome/browser/profiles/profile.h"
  30 #include "chrome/browser/profiles/profile_manager.h"
  31 #include "chrome/browser/ui/browser.h"
  32 #include "chrome/browser/ui/browser_finder.h"
  33 #include "chrome/browser/ui/browser_tabstrip.h"
  34 #include "chrome/browser/ui/host_desktop.h"
  35 #include "chrome/common/chrome_switches.h"
  36 #include "chrome/common/extensions/extension_constants.h"
  37 #include "chrome/common/extensions/extension_icon_set.h"
  38 #include "chrome/common/extensions/manifest_handlers/icons_handler.h"
  39 #include "chrome/common/pref_names.h"
  40 #include "content/public/browser/notification_service.h"
  41 #include "content/public/browser/site_instance.h"
  42 #include "content/public/browser/web_contents.h"
  43 #include "extensions/browser/extension_system.h"
  44 #include "extensions/common/extension.h"
  45 #include "extensions/common/extension_set.h"
  46 #include "extensions/common/manifest_handlers/background_info.h"
  47 #include "grit/generated_resources.h"
  48 #include "grit/theme_resources.h"
  49 #include "ipc/ipc_message.h"
  50 #include "ui/base/l10n/l10n_util.h"
  51 #include "ui/base/resource/resource_bundle.h"
  52 #include "ui/gfx/image/image.h"
  53
  54 #if defined(ENABLE_NOTIFICATIONS)
  55 #include "ui/message_center/message_center.h"
  56 #include "ui/message_center/message_center_util.h"
  57 #endif
  58
  59 using content::SiteInstance;
  60 using content::WebContents;
  61 using extensions::BackgroundInfo;
  62 using extensions::Extension;
  63 using extensions::UnloadedExtensionInfo;
  64
  65 namespace {
  66
  67 const char kNotificationPrefix[] = "app.background.crashed.";
  68
  69 void CloseBalloon(const std::string& balloon_id) {
  70   NotificationUIManager* notification_ui_manager =
  71       g_browser_process->notification_ui_manager();
  72   bool cancelled ALLOW_UNUSED = notification_ui_manager->CancelById(balloon_id);
  73 #if defined(ENABLE_NOTIFICATIONS)
  74   if (cancelled && message_center::IsRichNotificationEnabled()) {
  75     // TODO(dewittj): Add this functionality to the notification UI manager's
  76     // API.
  77     g_browser_process->message_center()->SetVisibility(
  78         message_center::VISIBILITY_TRANSIENT);
  79   }
  80 #endif
  81 }
  82
  83 // Closes the crash notification balloon for the app/extension with this id.
  84 void ScheduleCloseBalloon(const std::string& extension_id) {
  85   if (!base::MessageLoop::current())  // For unit_tests
  86     return;
  87   base::MessageLoop::current()->PostTask(
  88       FROM_HERE, base::Bind(&CloseBalloon, kNotificationPrefix + extension_id));
  89 }
  90
  91 // Delegate for the app/extension crash notification balloon. Restarts the
  92 // app/extension when the balloon is clicked.
  93 class CrashNotificationDelegate : public NotificationDelegate {
  94  public:
  95   CrashNotificationDelegate(Profile* profile,
  96                             const Extension* extension)
  97       : profile_(profile),
  98         is_hosted_app_(extension->is_hosted_app()),
  99         is_platform_app_(extension->is_platform_app()),
 100         extension_id_(extension->id()) {
 101   }
 102
 103   virtual void Display() OVERRIDE {}
 104
 105   virtual void Error() OVERRIDE {}
 106
 107   virtual void Close(bool by_user) OVERRIDE {}
 108
 109   virtual void Click() OVERRIDE {
 110     // http://crbug.com/247790 involves a crash notification balloon being
 111     // clicked while the extension isn't in the TERMINATED state. In that case,
 112     // any of the "reload" methods called below can unload the extension, which
 113     // indirectly destroys *this, invalidating all the member variables, so we
 114     // copy the extension ID before using it.
 115     std::string copied_extension_id = extension_id_;
 116     if (is_hosted_app_) {
 117       // There can be a race here: user clicks the balloon, and simultaneously
 118       // reloads the sad tab for the app. So we check here to be safe before
 119       // loading the background page.
 120       BackgroundContentsService* service =
 121           BackgroundContentsServiceFactory::GetForProfile(profile_);
 122       if (!service->GetAppBackgroundContents(
 123               base::ASCIIToUTF16(copied_extension_id))) {
 124         service->LoadBackgroundContentsForExtension(profile_,
 125                                                     copied_extension_id);
 126       }
 127     } else if (is_platform_app_) {
 128       apps::AppLoadService::Get(profile_)->
 129           RestartApplication(copied_extension_id);
 130     } else {
 131       extensions::ExtensionSystem::Get(profile_)->extension_service()->
 132           ReloadExtension(copied_extension_id);
 133     }
 134
 135     // Closing the crash notification balloon for the app/extension here should
 136     // be OK, but it causes a crash on Mac, see: http://crbug.com/78167
 137     ScheduleCloseBalloon(copied_extension_id);
 138   }
 139
 140   virtual bool HasClickedListener() OVERRIDE { return true; }
 141
 142   virtual std::string id() const OVERRIDE {
 143     return kNotificationPrefix + extension_id_;
 144   }
 145
 146   virtual content::RenderViewHost* GetRenderViewHost() const OVERRIDE {
 147     return NULL;
 148   }
 149
 150  private:
 151   virtual ~CrashNotificationDelegate() {}
 152
 153   Profile* profile_;
 154   bool is_hosted_app_;
 155   bool is_platform_app_;
 156   std::string extension_id_;
 157
 158   DISALLOW_COPY_AND_ASSIGN(CrashNotificationDelegate);
 159 };
 160
 161 #if defined(ENABLE_NOTIFICATIONS)
 162 void NotificationImageReady(
 163     const std::string extension_name,
 164     const base::string16 message,
 165     scoped_refptr<CrashNotificationDelegate> delegate,
 166     Profile* profile,
 167     const gfx::Image& icon) {
 168   gfx::Image notification_icon(icon);
 169   if (notification_icon.IsEmpty()) {
 170     ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
 171     notification_icon = rb.GetImageNamed(IDR_EXTENSION_DEFAULT_ICON);
 172   }
 173
 174   // Origin URL must be different from the crashed extension to avoid the
 175   // conflict. NotificationSystemObserver will cancel all notifications from
 176   // the same origin when NOTIFICATION_EXTENSION_UNLOADED.
 177   // TODO(mukai, dewittj): remove this and switch to message center
 178   // notifications.
 179   DesktopNotificationService::AddIconNotification(
 180       GURL() /* empty origin */,
 181       base::string16(),
 182       message,
 183       notification_icon,
 184       base::string16(),
 185       delegate.get(),
 186       profile);
 187 }
 188 #endif
 189
 190 // Show a popup notification balloon with a crash message for a given app/
 191 // extension.
 192 void ShowBalloon(const Extension* extension, Profile* profile) {
 193 #if defined(ENABLE_NOTIFICATIONS)
 194   const base::string16 message = l10n_util::GetStringFUTF16(
 195       extension->is_app() ? IDS_BACKGROUND_CRASHED_APP_BALLOON_MESSAGE :
 196                             IDS_BACKGROUND_CRASHED_EXTENSION_BALLOON_MESSAGE,
 197       base::UTF8ToUTF16(extension->name()));
 198   extension_misc::ExtensionIcons size(extension_misc::EXTENSION_ICON_MEDIUM);
 199   extensions::ExtensionResource resource =
 200       extensions::IconsInfo::GetIconResource(
 201           extension, size, ExtensionIconSet::MATCH_SMALLER);
 202   // We can't just load the image in the Observe method below because, despite
 203   // what this method is called, it may call the callback synchronously.
 204   // However, it's possible that the extension went away during the interim,
 205   // so we'll bind all the pertinent data here.
 206   extensions::ImageLoader::Get(profile)->LoadImageAsync(
 207       extension,
 208       resource,
 209       gfx::Size(size, size),
 210       base::Bind(
 211           &NotificationImageReady,
 212           extension->name(),
 213           message,
 214           make_scoped_refptr(new CrashNotificationDelegate(profile, extension)),
 215           profile));
 216 #endif
 217 }
 218
 219 void ReloadExtension(const std::string& extension_id, Profile* profile) {
 220   if (g_browser_process->IsShuttingDown() ||
 221       !g_browser_process->profile_manager()->IsValidProfile(profile)) {
 222       return;
 223   }
 224   extensions::ExtensionSystem* extension_system =
 225       extensions::ExtensionSystem::Get(profile);
 226   if (!extension_system || !extension_system->extension_service())
 227     return;
 228   if (!extension_system->extension_service()->
 229           GetTerminatedExtension(extension_id)) {
 230     // Either the app/extension was uninstalled by policy or it has since
 231     // been restarted successfully by someone else (the user).
 232     return;
 233   }
 234   extension_system->extension_service()->ReloadExtension(extension_id);
 235 }
 236
 237 }  // namespace
 238
 239 // Keys for the information we store about individual BackgroundContents in
 240 // prefs. There is one top-level DictionaryValue (stored at
 241 // prefs::kRegisteredBackgroundContents). Information about each
 242 // BackgroundContents is stored under that top-level DictionaryValue, keyed
 243 // by the parent application ID for easy lookup.
 244 //
 245 // kRegisteredBackgroundContents:
 246 //    DictionaryValue {
 247 //       <appid_1>: { "url": <url1>, "name": <frame_name> },
 248 //       <appid_2>: { "url": <url2>, "name": <frame_name> },
 249 //         ... etc ...
 250 //    }
 251 const char kUrlKey[] = "url";
 252 const char kFrameNameKey[] = "name";
 253
 254 int BackgroundContentsService::restart_delay_in_ms_ = 3000;  // 3 seconds.
 255
 256 BackgroundContentsService::BackgroundContentsService(
 257     Profile* profile, const CommandLine* command_line)
 258     : prefs_(NULL) {
 259   // Don't load/store preferences if the proper switch is not enabled, or if
 260   // the parent profile is incognito.
 261   if (!profile->IsOffTheRecord() &&
 262       !command_line->HasSwitch(switches::kDisableRestoreBackgroundContents))
 263     prefs_ = profile->GetPrefs();
 264
 265   // Listen for events to tell us when to load/unload persisted background
 266   // contents.
 267   StartObserving(profile);
 268 }
 269
 270 BackgroundContentsService::~BackgroundContentsService() {
 271   // BackgroundContents should be shutdown before we go away, as otherwise
 272   // our browser process refcount will be off.
 273   DCHECK(contents_map_.empty());
 274 }
 275
 276 // static
 277 void BackgroundContentsService::
 278     SetRestartDelayForForceInstalledAppsAndExtensionsForTesting(
 279         int restart_delay_in_ms) {
 280   restart_delay_in_ms_ = restart_delay_in_ms;
 281 }
 282
 283 // static
 284 std::string BackgroundContentsService::GetNotificationIdForExtensionForTesting(
 285     const std::string& extension_id) {
 286   return kNotificationPrefix + extension_id;
 287 }
 288
 289 // static
 290 void BackgroundContentsService::ShowBalloonForTesting(
 291     const extensions::Extension* extension,
 292     Profile* profile) {
 293   ShowBalloon(extension, profile);
 294 }
 295
 296 std::vector<BackgroundContents*>
 297 BackgroundContentsService::GetBackgroundContents() const
 298 {
 299   std::vector<BackgroundContents*> contents;
 300   for (BackgroundContentsMap::const_iterator it = contents_map_.begin();
 301        it != contents_map_.end(); ++it)
 302     contents.push_back(it->second.contents);
 303   return contents;
 304 }
 305
 306 void BackgroundContentsService::StartObserving(Profile* profile) {
 307   // On startup, load our background pages after extension-apps have loaded.
 308   registrar_.Add(this, chrome::NOTIFICATION_EXTENSIONS_READY,
 309                  content::Source<Profile>(profile));
 310
 311   // Track the lifecycle of all BackgroundContents in the system to allow us
 312   // to store an up-to-date list of the urls. Start tracking contents when they
 313   // have been opened via CreateBackgroundContents(), and stop tracking them
 314   // when they are closed by script.
 315   registrar_.Add(this, chrome::NOTIFICATION_BACKGROUND_CONTENTS_CLOSED,
 316                  content::Source<Profile>(profile));
 317
 318   // Stop tracking BackgroundContents when they have been deleted (happens
 319   // during shutdown or if the render process dies).
 320   registrar_.Add(this, chrome::NOTIFICATION_BACKGROUND_CONTENTS_DELETED,
 321                  content::Source<Profile>(profile));
 322
 323   // Track when the BackgroundContents navigates to a new URL so we can update
 324   // our persisted information as appropriate.
 325   registrar_.Add(this, chrome::NOTIFICATION_BACKGROUND_CONTENTS_NAVIGATED,
 326                  content::Source<Profile>(profile));
 327
 328   // Listen for new extension installs so that we can load any associated
 329   // background page.
 330   registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_LOADED,
 331                  content::Source<Profile>(profile));
 332
 333   // Track when the extensions crash so that the user can be notified
 334   // about it, and the crashed contents can be restarted.
 335   registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_PROCESS_TERMINATED,
 336                  content::Source<Profile>(profile));
 337   registrar_.Add(this, chrome::NOTIFICATION_BACKGROUND_CONTENTS_TERMINATED,
 338                  content::Source<Profile>(profile));
 339
 340   // Listen for extensions to be unloaded so we can shutdown associated
 341   // BackgroundContents.
 342   registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_UNLOADED,
 343                  content::Source<Profile>(profile));
 344
 345   // Make sure the extension-crash balloons are removed when the extension is
 346   // uninstalled/reloaded. We cannot do this from UNLOADED since a crashed
 347   // extension is unloaded immediately after the crash, not when user reloads or
 348   // uninstalls the extension.
 349   registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_UNINSTALLED,
 350                  content::Source<Profile>(profile));
 351 }
 352
 353 void BackgroundContentsService::Observe(
 354     int type,
 355     const content::NotificationSource& source,
 356     const content::NotificationDetails& details) {
 357   switch (type) {
 358     case chrome::NOTIFICATION_EXTENSIONS_READY: {
 359       Profile* profile = content::Source<Profile>(source).ptr();
 360       LoadBackgroundContentsFromManifests(profile);
 361       LoadBackgroundContentsFromPrefs(profile);
 362       SendChangeNotification(profile);
 363       break;
 364     }
 365     case chrome::NOTIFICATION_BACKGROUND_CONTENTS_DELETED:
 366       BackgroundContentsShutdown(
 367           content::Details<BackgroundContents>(details).ptr());
 368       SendChangeNotification(content::Source<Profile>(source).ptr());
 369       break;
 370     case chrome::NOTIFICATION_BACKGROUND_CONTENTS_CLOSED:
 371       DCHECK(IsTracked(content::Details<BackgroundContents>(details).ptr()));
 372       UnregisterBackgroundContents(
 373           content::Details<BackgroundContents>(details).ptr());
 374       // CLOSED is always followed by a DELETED notification so we'll send our
 375       // change notification there.
 376       break;
 377     case chrome::NOTIFICATION_BACKGROUND_CONTENTS_NAVIGATED: {
 378       DCHECK(IsTracked(content::Details<BackgroundContents>(details).ptr()));
 379
 380       // Do not register in the pref if the extension has a manifest-specified
 381       // background page.
 382       BackgroundContents* bgcontents =
 383           content::Details<BackgroundContents>(details).ptr();
 384       Profile* profile = content::Source<Profile>(source).ptr();
 385       const base::string16& appid = GetParentApplicationId(bgcontents);
 386       ExtensionService* extension_service =
 387           extensions::ExtensionSystem::Get(profile)->extension_service();
 388       // extension_service can be NULL when running tests.
 389       if (extension_service) {
 390         const Extension* extension = extension_service->GetExtensionById(
 391             base::UTF16ToUTF8(appid), false);
 392         if (extension && BackgroundInfo::HasBackgroundPage(extension))
 393           break;
 394       }
 395       RegisterBackgroundContents(bgcontents);
 396       break;
 397     }
 398     case chrome::NOTIFICATION_EXTENSION_LOADED: {
 399       const Extension* extension =
 400           content::Details<const Extension>(details).ptr();
 401       Profile* profile = content::Source<Profile>(source).ptr();
 402       if (extension->is_hosted_app() &&
 403           BackgroundInfo::HasBackgroundPage(extension)) {
 404         // If there is a background page specified in the manifest for a hosted
 405         // app, then blow away registered urls in the pref.
 406         ShutdownAssociatedBackgroundContents(
 407             base::ASCIIToUTF16(extension->id()));
 408
 409         ExtensionService* service =
 410             extensions::ExtensionSystem::Get(profile)->extension_service();
 411         if (service && service->is_ready()) {
 412           // Now load the manifest-specified background page. If service isn't
 413           // ready, then the background page will be loaded from the
 414           // EXTENSIONS_READY callback.
 415           LoadBackgroundContents(profile,
 416                                  BackgroundInfo::GetBackgroundURL(extension),
 417                                  base::ASCIIToUTF16("background"),
 418                                  base::UTF8ToUTF16(extension->id()));
 419         }
 420       }
 421
 422       // Close the crash notification balloon for the app/extension, if any.
 423       ScheduleCloseBalloon(extension->id());
 424       SendChangeNotification(profile);
 425       break;
 426     }
 427     case chrome::NOTIFICATION_EXTENSION_PROCESS_TERMINATED:
 428     case chrome::NOTIFICATION_BACKGROUND_CONTENTS_TERMINATED: {
 429       Profile* profile = content::Source<Profile>(source).ptr();
 430       const Extension* extension = NULL;
 431       if (type == chrome::NOTIFICATION_BACKGROUND_CONTENTS_TERMINATED) {
 432         BackgroundContents* bg =
 433             content::Details<BackgroundContents>(details).ptr();
 434         std::string extension_id = UTF16ToASCII(
 435             BackgroundContentsServiceFactory::GetForProfile(profile)->
 436                 GetParentApplicationId(bg));
 437         extension =
 438           extensions::ExtensionSystem::Get(profile)->extension_service()->
 439               GetExtensionById(extension_id, false);
 440       } else {
 441         extensions::ExtensionHost* extension_host =
 442             content::Details<extensions::ExtensionHost>(details).ptr();
 443         extension = extension_host->extension();
 444       }
 445       if (!extension)
 446         break;
 447
 448       const bool force_installed =
 449           extensions::Manifest::IsComponentLocation(extension->location()) ||
 450           extensions::Manifest::IsPolicyLocation(extension->location());
 451       if (!force_installed) {
 452         ShowBalloon(extension, profile);
 453       } else {
 454         // Restart the extension.
 455         RestartForceInstalledExtensionOnCrash(extension, profile);
 456       }
 457       break;
 458     }
 459     case chrome::NOTIFICATION_EXTENSION_UNLOADED:
 460       switch (content::Details<UnloadedExtensionInfo>(details)->reason) {
 461         case UnloadedExtensionInfo::REASON_DISABLE:    // Fall through.
 462         case UnloadedExtensionInfo::REASON_TERMINATE:  // Fall through.
 463         case UnloadedExtensionInfo::REASON_UNINSTALL:  // Fall through.
 464         case UnloadedExtensionInfo::REASON_BLACKLIST:
 465           ShutdownAssociatedBackgroundContents(base::ASCIIToUTF16(
 466               content::Details<UnloadedExtensionInfo>(details)->
 467                   extension->id()));
 468           SendChangeNotification(content::Source<Profile>(source).ptr());
 469           break;
 470         case UnloadedExtensionInfo::REASON_UPDATE: {
 471           // If there is a manifest specified background page, then shut it down
 472           // here, since if the updated extension still has the background page,
 473           // then it will be loaded from LOADED callback. Otherwise, leave
 474           // BackgroundContents in place.
 475           // We don't call SendChangeNotification here - it will be generated
 476           // from the LOADED callback.
 477           const Extension* extension =
 478               content::Details<UnloadedExtensionInfo>(details)->extension;
 479           if (BackgroundInfo::HasBackgroundPage(extension)) {
 480             ShutdownAssociatedBackgroundContents(
 481                 base::ASCIIToUTF16(extension->id()));
 482           }
 483           break;
 484         }
 485         default:
 486           NOTREACHED();
 487           ShutdownAssociatedBackgroundContents(base::ASCIIToUTF16(
 488               content::Details<UnloadedExtensionInfo>(details)->
 489                   extension->id()));
 490           break;
 491       }
 492       break;
 493
 494     case chrome::NOTIFICATION_EXTENSION_UNINSTALLED: {
 495       // Close the crash notification balloon for the app/extension, if any.
 496       ScheduleCloseBalloon(
 497           content::Details<const Extension>(details).ptr()->id());
 498       break;
 499     }
 500
 501     default:
 502       NOTREACHED();
 503       break;
 504   }
 505 }
 506
 507 void BackgroundContentsService::RestartForceInstalledExtensionOnCrash(
 508     const Extension* extension,
 509     Profile* profile) {
 510   base::MessageLoop::current()->PostDelayedTask(FROM_HERE,
 511       base::Bind(&ReloadExtension, extension->id(), profile),
 512       base::TimeDelta::FromMilliseconds(restart_delay_in_ms_));
 513 }
 514
 515 // Loads all background contents whose urls have been stored in prefs.
 516 void BackgroundContentsService::LoadBackgroundContentsFromPrefs(
 517     Profile* profile) {
 518   if (!prefs_)
 519     return;
 520   const base::DictionaryValue* contents =
 521       prefs_->GetDictionary(prefs::kRegisteredBackgroundContents);
 522   if (!contents)
 523     return;
 524   ExtensionService* extensions_service =
 525           extensions::ExtensionSystem::Get(profile)->extension_service();
 526   DCHECK(extensions_service);
 527   for (base::DictionaryValue::Iterator it(*contents);
 528        !it.IsAtEnd(); it.Advance()) {
 529     // Check to make sure that the parent extension is still enabled.
 530     const Extension* extension = extensions_service->
 531         GetExtensionById(it.key(), false);
 532     if (!extension) {
 533       // We should never reach here - it should not be possible for an app
 534       // to become uninstalled without the associated BackgroundContents being
 535       // unregistered via the EXTENSIONS_UNLOADED notification, unless there's a
 536       // crash before we could save our prefs, or if the user deletes the
 537       // extension files manually rather than uninstalling it.
 538       NOTREACHED() << "No extension found for BackgroundContents - id = "
 539                    << it.key();
 540       // Don't cancel out of our loop, just ignore this BackgroundContents and
 541       // load the next one.
 542       continue;
 543     }
 544     LoadBackgroundContentsFromDictionary(profile, it.key(), contents);
 545   }
 546 }
 547
 548 void BackgroundContentsService::SendChangeNotification(Profile* profile) {
 549   content::NotificationService::current()->Notify(
 550       chrome::NOTIFICATION_BACKGROUND_CONTENTS_SERVICE_CHANGED,
 551       content::Source<Profile>(profile),
 552       content::Details<BackgroundContentsService>(this));
 553 }
 554
 555 void BackgroundContentsService::LoadBackgroundContentsForExtension(
 556     Profile* profile,
 557     const std::string& extension_id) {
 558   // First look if the manifest specifies a background page.
 559   const Extension* extension =
 560       extensions::ExtensionSystem::Get(profile)->extension_service()->
 561           GetExtensionById(extension_id, false);
 562   DCHECK(!extension || extension->is_hosted_app());
 563   if (extension && BackgroundInfo::HasBackgroundPage(extension)) {
 564     LoadBackgroundContents(profile,
 565                            BackgroundInfo::GetBackgroundURL(extension),
 566                            base::ASCIIToUTF16("background"),
 567                            base::UTF8ToUTF16(extension->id()));
 568     return;
 569   }
 570
 571   // Now look in the prefs.
 572   if (!prefs_)
 573     return;
 574   const base::DictionaryValue* contents =
 575       prefs_->GetDictionary(prefs::kRegisteredBackgroundContents);
 576   if (!contents)
 577     return;
 578   LoadBackgroundContentsFromDictionary(profile, extension_id, contents);
 579 }
 580
 581 void BackgroundContentsService::LoadBackgroundContentsFromDictionary(
 582     Profile* profile,
 583     const std::string& extension_id,
 584     const base::DictionaryValue* contents) {
 585   ExtensionService* extensions_service =
 586       extensions::ExtensionSystem::Get(profile)->extension_service();
 587   DCHECK(extensions_service);
 588
 589   const base::DictionaryValue* dict;
 590   if (!contents->GetDictionaryWithoutPathExpansion(extension_id, &dict) ||
 591       dict == NULL)
 592     return;
 593
 594   base::string16 frame_name;
 595   std::string url;
 596   dict->GetString(kUrlKey, &url);
 597   dict->GetString(kFrameNameKey, &frame_name);
 598   LoadBackgroundContents(profile,
 599                          GURL(url),
 600                          frame_name,
 601                          base::UTF8ToUTF16(extension_id));
 602 }
 603
 604 void BackgroundContentsService::LoadBackgroundContentsFromManifests(
 605     Profile* profile) {
 606   const extensions::ExtensionSet* extensions =
 607       extensions::ExtensionSystem::Get(profile)->
 608           extension_service()->extensions();
 609   for (extensions::ExtensionSet::const_iterator iter = extensions->begin();
 610        iter != extensions->end(); ++iter) {
 611     const Extension* extension = iter->get();
 612     if (extension->is_hosted_app() &&
 613         BackgroundInfo::HasBackgroundPage(extension)) {
 614       LoadBackgroundContents(profile,
 615                              BackgroundInfo::GetBackgroundURL(extension),
 616                              base::ASCIIToUTF16("background"),
 617                              base::UTF8ToUTF16(extension->id()));
 618     }
 619   }
 620 }
 621
 622 void BackgroundContentsService::LoadBackgroundContents(
 623     Profile* profile,
 624     const GURL& url,
 625     const base::string16& frame_name,
 626     const base::string16& application_id) {
 627   // We are depending on the fact that we will initialize before any user
 628   // actions or session restore can take place, so no BackgroundContents should
 629   // be running yet for the passed application_id.
 630   DCHECK(!GetAppBackgroundContents(application_id));
 631   DCHECK(!application_id.empty());
 632   DCHECK(url.is_valid());
 633   DVLOG(1) << "Loading background content url: " << url;
 634
 635   BackgroundContents* contents = CreateBackgroundContents(
 636       SiteInstance::CreateForURL(profile, url),
 637       MSG_ROUTING_NONE,
 638       profile,
 639       frame_name,
 640       application_id,
 641       std::string(),
 642       NULL);
 643
 644   // TODO(atwilson): Create RenderViews asynchronously to avoid increasing
 645   // startup latency (http://crbug.com/47236).
 646   contents->web_contents()->GetController().LoadURL(
 647       url, content::Referrer(), content::PAGE_TRANSITION_LINK, std::string());
 648 }
 649
 650 BackgroundContents* BackgroundContentsService::CreateBackgroundContents(
 651     SiteInstance* site,
 652     int routing_id,
 653     Profile* profile,
 654     const base::string16& frame_name,
 655     const base::string16& application_id,
 656     const std::string& partition_id,
 657     content::SessionStorageNamespace* session_storage_namespace) {
 658   BackgroundContents* contents = new BackgroundContents(
 659       site, routing_id, this, partition_id, session_storage_namespace);
 660
 661   // Register the BackgroundContents internally, then send out a notification
 662   // to external listeners.
 663   BackgroundContentsOpenedDetails details = {contents,
 664                                              frame_name,
 665                                              application_id};
 666   BackgroundContentsOpened(&details);
 667   content::NotificationService::current()->Notify(
 668       chrome::NOTIFICATION_BACKGROUND_CONTENTS_OPENED,
 669       content::Source<Profile>(profile),
 670       content::Details<BackgroundContentsOpenedDetails>(&details));
 671
 672   // A new background contents has been created - notify our listeners.
 673   SendChangeNotification(profile);
 674   return contents;
 675 }
 676
 677 void BackgroundContentsService::RegisterBackgroundContents(
 678     BackgroundContents* background_contents) {
 679   DCHECK(IsTracked(background_contents));
 680   if (!prefs_)
 681     return;
 682
 683   // We store the first URL we receive for a given application. If there's
 684   // already an entry for this application, no need to do anything.
 685   // TODO(atwilson): Verify that this is the desired behavior based on developer
 686   // feedback (http://crbug.com/47118).
 687   DictionaryPrefUpdate update(prefs_, prefs::kRegisteredBackgroundContents);
 688   base::DictionaryValue* pref = update.Get();
 689   const base::string16& appid = GetParentApplicationId(background_contents);
 690   base::DictionaryValue* current;
 691   if (pref->GetDictionaryWithoutPathExpansion(base::UTF16ToUTF8(appid),
 692                                               &current)) {
 693     return;
 694   }
 695
 696   // No entry for this application yet, so add one.
 697   base::DictionaryValue* dict = new base::DictionaryValue();
 698   dict->SetString(kUrlKey, background_contents->GetURL().spec());
 699   dict->SetString(kFrameNameKey, contents_map_[appid].frame_name);
 700   pref->SetWithoutPathExpansion(base::UTF16ToUTF8(appid), dict);
 701 }
 702
 703 bool BackgroundContentsService::HasRegisteredBackgroundContents(
 704     const base::string16& app_id) {
 705   if (!prefs_)
 706     return false;
 707   std::string app = base::UTF16ToUTF8(app_id);
 708   const base::DictionaryValue* contents =
 709       prefs_->GetDictionary(prefs::kRegisteredBackgroundContents);
 710   return contents->HasKey(app);
 711 }
 712
 713 void BackgroundContentsService::UnregisterBackgroundContents(
 714     BackgroundContents* background_contents) {
 715   if (!prefs_)
 716     return;
 717   DCHECK(IsTracked(background_contents));
 718   const base::string16 appid = GetParentApplicationId(background_contents);
 719   DictionaryPrefUpdate update(prefs_, prefs::kRegisteredBackgroundContents);
 720   update.Get()->RemoveWithoutPathExpansion(base::UTF16ToUTF8(appid), NULL);
 721 }
 722
 723 void BackgroundContentsService::ShutdownAssociatedBackgroundContents(
 724     const base::string16& appid) {
 725   BackgroundContents* contents = GetAppBackgroundContents(appid);
 726   if (contents) {
 727     UnregisterBackgroundContents(contents);
 728     // Background contents destructor shuts down the renderer.
 729     delete contents;
 730   }
 731 }
 732
 733 void BackgroundContentsService::BackgroundContentsOpened(
 734     BackgroundContentsOpenedDetails* details) {
 735   // Add the passed object to our list. Should not already be tracked.
 736   DCHECK(!IsTracked(details->contents));
 737   DCHECK(!details->application_id.empty());
 738   contents_map_[details->application_id].contents = details->contents;
 739   contents_map_[details->application_id].frame_name = details->frame_name;
 740
 741   ScheduleCloseBalloon(UTF16ToASCII(details->application_id));
 742 }
 743
 744 // Used by test code and debug checks to verify whether a given
 745 // BackgroundContents is being tracked by this instance.
 746 bool BackgroundContentsService::IsTracked(
 747     BackgroundContents* background_contents) const {
 748   return !GetParentApplicationId(background_contents).empty();
 749 }
 750
 751 void BackgroundContentsService::BackgroundContentsShutdown(
 752     BackgroundContents* background_contents) {
 753   // Remove the passed object from our list.
 754   DCHECK(IsTracked(background_contents));
 755   base::string16 appid = GetParentApplicationId(background_contents);
 756   contents_map_.erase(appid);
 757 }
 758
 759 BackgroundContents* BackgroundContentsService::GetAppBackgroundContents(
 760     const base::string16& application_id) {
 761   BackgroundContentsMap::const_iterator it = contents_map_.find(application_id);
 762   return (it != contents_map_.end()) ? it->second.contents : NULL;
 763 }
 764
 765 const base::string16& BackgroundContentsService::GetParentApplicationId(
 766     BackgroundContents* contents) const {
 767   for (BackgroundContentsMap::const_iterator it = contents_map_.begin();
 768        it != contents_map_.end(); ++it) {
 769     if (contents == it->second.contents)
 770       return it->first;
 771   }
 772   return base::EmptyString16();
 773 }
 774
 775 void BackgroundContentsService::AddWebContents(
 776     WebContents* new_contents,
 777     WindowOpenDisposition disposition,
 778     const gfx::Rect& initial_pos,
 779     bool user_gesture,
 780     bool* was_blocked) {
 781   Browser* browser = chrome::FindLastActiveWithProfile(
 782       Profile::FromBrowserContext(new_contents->GetBrowserContext()),
 783       chrome::GetActiveDesktop());
 784   if (browser) {
 785     chrome::AddWebContents(browser, NULL, new_contents, disposition,
 786                            initial_pos, user_gesture, was_blocked);
 787   }
 788 }