Options2: Pull the trigger.

chrome/browser/ui/webui/options2/extension_settings_handler.cc

Index: chrome/browser/ui/webui/options2/extension_settings_handler.cc
diff --git a/chrome/browser/ui/webui/options2/extension_settings_handler.cc b/chrome/browser/ui/webui/options2/extension_settings_handler.cc
new file mode 100644
index 0000000000000000000000000000000000000000..fddf7f18e023e3e50f9e08f5e152a1825e325cba
--- /dev/null
+++ b/chrome/browser/ui/webui/options2/extension_settings_handler.cc
@@ -0,0 +1,785 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/ui/webui/options2/extension_settings_handler.h"
+
+#include "base/auto_reset.h"
+#include "base/base64.h"
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+#include "base/command_line.h"
+#include "base/file_util.h"
+#include "base/string_number_conversions.h"
+#include "base/utf_string_conversions.h"
+#include "base/values.h"
+#include "base/version.h"
+#include "chrome/browser/debugger/devtools_window.h"
+#include "chrome/browser/extensions/crx_installer.h"
+#include "chrome/browser/extensions/extension_disabled_infobar_delegate.h"
+#include "chrome/browser/extensions/extension_service.h"
+#include "chrome/browser/extensions/extension_updater.h"
+#include "chrome/browser/extensions/extension_warning_set.h"
+#include "chrome/browser/extensions/unpacked_installer.h"
+#include "chrome/browser/google/google_util.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/tab_contents/background_contents.h"
+#include "chrome/browser/ui/webui/extensions/extension_icon_source.h"
+#include "chrome/common/chrome_switches.h"
+#include "chrome/common/chrome_view_type.h"
+#include "chrome/common/extensions/extension.h"
+#include "chrome/common/pref_names.h"
+#include "chrome/common/url_constants.h"
+#include "content/browser/browsing_instance.h"
+#include "content/browser/renderer_host/render_view_host.h"
+#include "content/browser/tab_contents/tab_contents.h"
+#include "content/browser/tab_contents/tab_contents_view.h"
+#include "content/public/browser/notification_service.h"
+#include "content/public/browser/notification_types.h"
+#include "grit/browser_resources.h"
+#include "grit/chromium_strings.h"
+#include "grit/generated_resources.h"
+#include "grit/theme_resources.h"
+#include "ui/base/l10n/l10n_util.h"
+#include "ui/base/resource/resource_bundle.h"
+
+namespace {
+
+bool ShouldShowExtension(const Extension* extension) {
+  // Don't show themes since this page's UI isn't really useful for themes.
+  if (extension->is_theme())
+    return false;
+
+  // Don't show component extensions because they are only extensions as an
+  // implementation detail of Chrome.
+  if (extension->location() == Extension::COMPONENT &&
+      !CommandLine::ForCurrentProcess()->HasSwitch(
+        switches::kShowComponentExtensionOptions))
+    return false;
+
+  // Always show unpacked extensions and apps.
+  if (extension->location() == Extension::LOAD)
+    return true;
+
+  // Unless they are unpacked, never show hosted apps.
+  if (extension->is_hosted_app())
+    return false;
+
+  return true;
+}
+
+}  // namespace
+
+///////////////////////////////////////////////////////////////////////////////
+//
+// ExtensionSettingsHandler
+//
+///////////////////////////////////////////////////////////////////////////////
+
+ExtensionSettingsHandler::ExtensionSettingsHandler()
+    : extension_service_(NULL),
+      ignore_notifications_(false),
+      deleting_rvh_(NULL),
+      registered_for_notifications_(false) {
+}
+
+ExtensionSettingsHandler::~ExtensionSettingsHandler() {
+  // There may be pending file dialogs, we need to tell them that we've gone
+  // away so they don't try and call back to us.
+  if (load_extension_dialog_.get())
+    load_extension_dialog_->ListenerDestroyed();
+
+  registrar_.RemoveAll();
+}
+
+// static
+void ExtensionSettingsHandler::RegisterUserPrefs(PrefService* prefs) {
+  prefs->RegisterBooleanPref(prefs::kExtensionsUIDeveloperMode,
+                             false,
+                             PrefService::SYNCABLE_PREF);
+}
+
+void ExtensionSettingsHandler::RegisterMessages() {
+  web_ui_->RegisterMessageCallback("extensionSettingsRequestExtensionsData",
+      base::Bind(&ExtensionSettingsHandler::HandleRequestExtensionsData,
+                 base::Unretained(this)));
+  web_ui_->RegisterMessageCallback("extensionSettingsToggleDeveloperMode",
+      base::Bind(&ExtensionSettingsHandler::HandleToggleDeveloperMode,
+                 base::Unretained(this)));
+  web_ui_->RegisterMessageCallback("extensionSettingsInspect",
+      base::Bind(&ExtensionSettingsHandler::HandleInspectMessage,
+                 base::Unretained(this)));
+  web_ui_->RegisterMessageCallback("extensionSettingsReload",
+      base::Bind(&ExtensionSettingsHandler::HandleReloadMessage,
+                 base::Unretained(this)));
+  web_ui_->RegisterMessageCallback("extensionSettingsEnable",
+      base::Bind(&ExtensionSettingsHandler::HandleEnableMessage,
+                 base::Unretained(this)));
+  web_ui_->RegisterMessageCallback("extensionSettingsEnableIncognito",
+      base::Bind(&ExtensionSettingsHandler::HandleEnableIncognitoMessage,
+                 base::Unretained(this)));
+  web_ui_->RegisterMessageCallback("extensionSettingsAllowFileAccess",
+      base::Bind(&ExtensionSettingsHandler::HandleAllowFileAccessMessage,
+                 base::Unretained(this)));
+  web_ui_->RegisterMessageCallback("extensionSettingsUninstall",
+      base::Bind(&ExtensionSettingsHandler::HandleUninstallMessage,
+                 base::Unretained(this)));
+  web_ui_->RegisterMessageCallback("extensionSettingsOptions",
+      base::Bind(&ExtensionSettingsHandler::HandleOptionsMessage,
+                 base::Unretained(this)));
+  web_ui_->RegisterMessageCallback("extensionSettingsShowButton",
+      base::Bind(&ExtensionSettingsHandler::HandleShowButtonMessage,
+                 base::Unretained(this)));
+  web_ui_->RegisterMessageCallback("extensionSettingsLoad",
+      base::Bind(&ExtensionSettingsHandler::HandleLoadMessage,
+                 base::Unretained(this)));
+  web_ui_->RegisterMessageCallback("extensionSettingsAutoupdate",
+      base::Bind(&ExtensionSettingsHandler::HandleAutoUpdateMessage,
+                 base::Unretained(this)));
+  web_ui_->RegisterMessageCallback("extensionSettingsSelectFilePath",
+      base::Bind(&ExtensionSettingsHandler::HandleSelectFilePathMessage,
+                 base::Unretained(this)));
+}
+
+void ExtensionSettingsHandler::HandleRequestExtensionsData(
+    const ListValue* args) {
+  DictionaryValue results;
+
+  // Add the extensions to the results structure.
+  ListValue *extensions_list = new ListValue();
+
+  ExtensionWarningSet* warnings = extension_service_->extension_warnings();
+
+  const ExtensionSet* extensions = extension_service_->extensions();
+  for (ExtensionSet::const_iterator extension = extensions->begin();
+       extension != extensions->end(); ++extension) {
+    if (ShouldShowExtension(*extension)) {
+      extensions_list->Append(CreateExtensionDetailValue(
+          extension_service_,
+          *extension,
+          GetActivePagesForExtension(*extension),
+          warnings,
+          true, false));  // enabled, terminated
+    }
+  }
+  extensions = extension_service_->disabled_extensions();
+  for (ExtensionSet::const_iterator extension = extensions->begin();
+       extension != extensions->end(); ++extension) {
+    if (ShouldShowExtension(*extension)) {
+      extensions_list->Append(CreateExtensionDetailValue(
+          extension_service_,
+          *extension,
+          GetActivePagesForExtension(*extension),
+          warnings,
+          false, false));  // enabled, terminated
+    }
+  }
+  extensions = extension_service_->terminated_extensions();
+  std::vector<ExtensionPage> empty_pages;
+  for (ExtensionSet::const_iterator extension = extensions->begin();
+       extension != extensions->end(); ++extension) {
+    if (ShouldShowExtension(*extension)) {
+      extensions_list->Append(CreateExtensionDetailValue(
+          extension_service_,
+          *extension,
+          empty_pages,  // Terminated process has no active pages.
+          warnings,
+          false, true));  // enabled, terminated
+    }
+  }
+  results.Set("extensions", extensions_list);
+
+  Profile* profile = Profile::FromWebUI(web_ui_);
+  bool developer_mode =
+      profile->GetPrefs()->GetBoolean(prefs::kExtensionsUIDeveloperMode);
+  results.SetBoolean("developerMode", developer_mode);
+
+  web_ui_->CallJavascriptFunction("ExtensionSettings.returnExtensionsData",
+                                  results);
+
+  MaybeRegisterForNotifications();
+}
+
+void ExtensionSettingsHandler::MaybeRegisterForNotifications() {
+  if (registered_for_notifications_)
+    return;
+
+  registered_for_notifications_  = true;
+  Profile* profile = Profile::FromWebUI(web_ui_);
+
+  // Register for notifications that we need to reload the page.
+  registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_LOADED,
+                 content::Source<Profile>(profile));
+  registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_UNLOADED,
+                 content::Source<Profile>(profile));
+  registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_UPDATE_DISABLED,
+                 content::Source<Profile>(profile));
+  registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_WARNING_CHANGED,
+                 content::Source<Profile>(profile));
+  registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_HOST_CREATED,
+                 content::NotificationService::AllBrowserContextsAndSources());
+  registrar_.Add(this,
+                 content::NOTIFICATION_RENDER_VIEW_HOST_CREATED,
+                 content::NotificationService::AllBrowserContextsAndSources());
+  registrar_.Add(this,
+                 content::NOTIFICATION_RENDER_VIEW_HOST_DELETED,
+                 content::NotificationService::AllBrowserContextsAndSources());
+  registrar_.Add(this,
+                 chrome::NOTIFICATION_BACKGROUND_CONTENTS_NAVIGATED,
+                 content::NotificationService::AllBrowserContextsAndSources());
+  registrar_.Add(this,
+                 chrome::NOTIFICATION_BACKGROUND_CONTENTS_DELETED,
+                 content::NotificationService::AllBrowserContextsAndSources());
+  registrar_.Add(
+      this,
+      chrome::NOTIFICATION_EXTENSION_BROWSER_ACTION_VISIBILITY_CHANGED,
+      content::Source<ExtensionPrefs>(profile->GetExtensionService()->
+                             extension_prefs()));
+}
+
+ExtensionUninstallDialog*
+ExtensionSettingsHandler::GetExtensionUninstallDialog() {
+  if (!extension_uninstall_dialog_.get()) {
+    extension_uninstall_dialog_.reset(
+        ExtensionUninstallDialog::Create(Profile::FromWebUI(web_ui_), this));
+  }
+  return extension_uninstall_dialog_.get();
+}
+
+void ExtensionSettingsHandler::HandleToggleDeveloperMode(
+      const ListValue* args) {
+  Profile* profile = Profile::FromWebUI(web_ui_);
+  bool developer_mode =
+      profile->GetPrefs()->GetBoolean(prefs::kExtensionsUIDeveloperMode);
+  profile->GetPrefs()->SetBoolean(
+      prefs::kExtensionsUIDeveloperMode, !developer_mode);
+  HandleRequestExtensionsData(NULL);
+}
+
+void ExtensionSettingsHandler::HandleInspectMessage(const ListValue* args) {
+  std::string render_process_id_str;
+  std::string render_view_id_str;
+  int render_process_id;
+  int render_view_id;
+  CHECK_EQ(2U, args->GetSize());
+  CHECK(args->GetString(0, &render_process_id_str));
+  CHECK(args->GetString(1, &render_view_id_str));
+  CHECK(base::StringToInt(render_process_id_str, &render_process_id));
+  CHECK(base::StringToInt(render_view_id_str, &render_view_id));
+  RenderViewHost* host = RenderViewHost::FromID(render_process_id,
+                                                render_view_id);
+  if (!host) {
+    // This can happen if the host has gone away since the page was displayed.
+    return;
+  }
+
+  DevToolsWindow::OpenDevToolsWindow(host);
+}
+
+void ExtensionSettingsHandler::HandleReloadMessage(const ListValue* args) {
+  std::string extension_id = UTF16ToUTF8(ExtractStringValue(args));
+  CHECK(!extension_id.empty());
+  extension_service_->ReloadExtension(extension_id);
+}
+
+void ExtensionSettingsHandler::HandleEnableMessage(const ListValue* args) {
+  CHECK_EQ(2U, args->GetSize());
+  std::string extension_id, enable_str;
+  CHECK(args->GetString(0, &extension_id));
+  CHECK(args->GetString(1, &enable_str));
+
+  const Extension* extension =
+      extension_service_->GetExtensionById(extension_id, true);
+  if (!Extension::UserMayDisable(extension->location())) {
+    LOG(ERROR) << "Attempt to enable an extension that is non-usermanagable was"
+               << "made. Extension id: " << extension->id();
+    return;
+  }
+
+  if (enable_str == "true") {
+    ExtensionPrefs* prefs = extension_service_->extension_prefs();
+    if (prefs->DidExtensionEscalatePermissions(extension_id)) {
+      ShowExtensionDisabledDialog(extension_service_,
+                                  Profile::FromWebUI(web_ui_), extension);
+    } else {
+      extension_service_->EnableExtension(extension_id);
+    }
+  } else {
+    extension_service_->DisableExtension(extension_id);
+  }
+}
+
+void ExtensionSettingsHandler::HandleEnableIncognitoMessage(
+    const ListValue* args) {
+  CHECK_EQ(2U, args->GetSize());
+  std::string extension_id, enable_str;
+  CHECK(args->GetString(0, &extension_id));
+  CHECK(args->GetString(1, &enable_str));
+  const Extension* extension =
+      extension_service_->GetExtensionById(extension_id, true);
+  DCHECK(extension);
+
+  // Flipping the incognito bit will generate unload/load notifications for the
+  // extension, but we don't want to reload the page, because a) we've already
+  // updated the UI to reflect the change, and b) we want the yellow warning
+  // text to stay until the user has left the page.
+  //
+  // TODO(aa): This creates crapiness in some cases. For example, in a main
+  // window, when toggling this, the browser action will flicker because it gets
+  // unloaded, then reloaded. It would be better to have a dedicated
+  // notification for this case.
+  //
+  // Bug: http://crbug.com/41384
+  AutoReset<bool> auto_reset_ignore_notifications(&ignore_notifications_, true);
+  extension_service_->SetIsIncognitoEnabled(extension->id(),
+                                            enable_str == "true");
+}
+
+void ExtensionSettingsHandler::HandleAllowFileAccessMessage(
+    const ListValue* args) {
+  CHECK_EQ(2U, args->GetSize());
+  std::string extension_id, allow_str;
+  CHECK(args->GetString(0, &extension_id));
+  CHECK(args->GetString(1, &allow_str));
+  const Extension* extension =
+      extension_service_->GetExtensionById(extension_id, true);
+  DCHECK(extension);
+
+  if (!Extension::UserMayDisable(extension->location())) {
+    LOG(ERROR) << "Attempt to change allow file access of an extension that is "
+               << "non-usermanagable was made. Extension id : "
+               << extension->id();
+    return;
+  }
+
+  extension_service_->SetAllowFileAccess(extension, allow_str == "true");
+}
+
+void ExtensionSettingsHandler::HandleUninstallMessage(const ListValue* args) {
+  std::string extension_id = UTF16ToUTF8(ExtractStringValue(args));
+  CHECK(!extension_id.empty());
+  const Extension* extension =
+      extension_service_->GetExtensionById(extension_id, true);
+  if (!extension)
+    extension = extension_service_->GetTerminatedExtension(extension_id);
+  if (!extension)
+    return;
+
+  if (!Extension::UserMayDisable(extension->location())) {
+    LOG(ERROR) << "Attempt to uninstall an extension that is non-usermanagable "
+               << "was made. Extension id : " << extension->id();
+    return;
+  }
+
+  if (!extension_id_prompting_.empty())
+    return;  // Only one prompt at a time.
+
+  extension_id_prompting_ = extension_id;
+
+  GetExtensionUninstallDialog()->ConfirmUninstall(extension);
+}
+
+void ExtensionSettingsHandler::ExtensionUninstallAccepted() {
+  DCHECK(!extension_id_prompting_.empty());
+
+  bool was_terminated = false;
+
+  // The extension can be uninstalled in another window while the UI was
+  // showing. Do nothing in that case.
+  const Extension* extension =
+      extension_service_->GetExtensionById(extension_id_prompting_, true);
+  if (!extension) {
+    extension = extension_service_->GetTerminatedExtension(
+        extension_id_prompting_);
+    was_terminated = true;
+  }
+  if (!extension)
+    return;
+
+  extension_service_->UninstallExtension(extension_id_prompting_,
+                                         false,  // External uninstall.
+                                         NULL);  // Error.
+  extension_id_prompting_ = "";
+
+  // There will be no EXTENSION_UNLOADED notification for terminated
+  // extensions as they were already unloaded.
+  if (was_terminated)
+    HandleRequestExtensionsData(NULL);
+}
+
+void ExtensionSettingsHandler::ExtensionUninstallCanceled() {
+  extension_id_prompting_ = "";
+}
+
+void ExtensionSettingsHandler::HandleOptionsMessage(const ListValue* args) {
+  const Extension* extension = GetExtension(args);
+  if (!extension || extension->options_url().is_empty())
+    return;
+  Profile::FromWebUI(web_ui_)->GetExtensionProcessManager()->OpenOptionsPage(
+      extension, NULL);
+}
+
+void ExtensionSettingsHandler::HandleShowButtonMessage(const ListValue* args) {
+  const Extension* extension = GetExtension(args);
+  extension_service_->SetBrowserActionVisibility(extension, true);
+}
+
+void ExtensionSettingsHandler::HandleLoadMessage(const ListValue* args) {
+  FilePath::StringType string_path;
+  CHECK_EQ(1U, args->GetSize()) << args->GetSize();
+  CHECK(args->GetString(0, &string_path));
+  extensions::UnpackedInstaller::Create(extension_service_)->
+      Load(FilePath(string_path));
+}
+
+void ExtensionSettingsHandler::ShowAlert(const std::string& message) {
+  ListValue arguments;
+  arguments.Append(Value::CreateStringValue(message));
+  web_ui_->CallJavascriptFunction("alert", arguments);
+}
+
+void ExtensionSettingsHandler::HandleAutoUpdateMessage(const ListValue* args) {
+  ExtensionUpdater* updater = extension_service_->updater();
+  if (updater)
+    updater->CheckNow();
+}
+
+void ExtensionSettingsHandler::HandleSelectFilePathMessage(
+    const ListValue* args) {
+  std::string select_type;
+  std::string operation;
+  CHECK_EQ(2U, args->GetSize());
+  CHECK(args->GetString(0, &select_type));
+  CHECK(args->GetString(1, &operation));
+
+  SelectFileDialog::Type type = SelectFileDialog::SELECT_FOLDER;
+  SelectFileDialog::FileTypeInfo info;
+  int file_type_index = 0;
+  if (select_type == "file")
+    type = SelectFileDialog::SELECT_OPEN_FILE;
+
+  string16 select_title;
+  if (operation == "load") {
+    select_title = l10n_util::GetStringUTF16(IDS_EXTENSION_LOAD_FROM_DIRECTORY);
+  } else if (operation == "packRoot") {
+    select_title = l10n_util::GetStringUTF16(
+        IDS_EXTENSION_PACK_DIALOG_SELECT_ROOT);
+  } else if (operation == "pem") {
+    select_title = l10n_util::GetStringUTF16(
+        IDS_EXTENSION_PACK_DIALOG_SELECT_KEY);
+    info.extensions.push_back(std::vector<FilePath::StringType>());
+        info.extensions.front().push_back(FILE_PATH_LITERAL("pem"));
+        info.extension_description_overrides.push_back(
+            l10n_util::GetStringUTF16(
+                IDS_EXTENSION_PACK_DIALOG_KEY_FILE_TYPE_DESCRIPTION));
+        info.include_all_files = true;
+    file_type_index = 1;
+  } else {
+    NOTREACHED();
+    return;
+  }
+
+  load_extension_dialog_ = SelectFileDialog::Create(this);
+  load_extension_dialog_->SelectFile(type, select_title, FilePath(), &info,
+      file_type_index, FILE_PATH_LITERAL(""), web_ui_->tab_contents(),
+      web_ui_->tab_contents()->view()->GetTopLevelNativeWindow(), NULL);
+}
+
+
+void ExtensionSettingsHandler::FileSelected(const FilePath& path, int index,
+                                            void* params) {
+  // Add the extensions to the results structure.
+  ListValue results;
+  results.Append(Value::CreateStringValue(path.value()));
+  web_ui_->CallJavascriptFunction("window.handleFilePathSelected", results);
+}
+
+void ExtensionSettingsHandler::MultiFilesSelected(
+    const std::vector<FilePath>& files, void* params) {
+  NOTREACHED();
+}
+
+void ExtensionSettingsHandler::GetLocalizedValues(
+    DictionaryValue* localized_strings) {
+  DCHECK(localized_strings);
+
+  RegisterTitle(localized_strings, "extensionSettings",
+                IDS_MANAGE_EXTENSIONS_SETTING_WINDOWS_TITLE);
+
+  localized_strings->SetString("extensionSettingsVisitWebsite",
+      l10n_util::GetStringUTF16(IDS_EXTENSIONS_VISIT_WEBSITE));
+
+  localized_strings->SetString("extensionSettingsDeveloperMode",
+    l10n_util::GetStringUTF16(IDS_EXTENSIONS_DEVELOPER_MODE_LINK));
+  localized_strings->SetString("extensionSettingsNoExtensions",
+    l10n_util::GetStringUTF16(IDS_EXTENSIONS_NONE_INSTALLED));
+  localized_strings->SetString("extensionSettingsSuggestGallery",
+      l10n_util::GetStringFUTF16(IDS_EXTENSIONS_NONE_INSTALLED_SUGGEST_GALLERY,
+      ASCIIToUTF16("<a href='") +
+          ASCIIToUTF16(google_util::AppendGoogleLocaleParam(
+              GURL(extension_urls::GetWebstoreLaunchURL())).spec()) +
+      ASCIIToUTF16("'>"),
+      ASCIIToUTF16("</a>")));
+  localized_strings->SetString("extensionSettingsGetMoreExtensions",
+      ASCIIToUTF16("<a href='") +
+      ASCIIToUTF16(google_util::AppendGoogleLocaleParam(
+          GURL(extension_urls::GetWebstoreLaunchURL())).spec()) +
+          ASCIIToUTF16("'>") +
+          l10n_util::GetStringUTF16(IDS_GET_MORE_EXTENSIONS) +
+      ASCIIToUTF16("</a>"));
+  localized_strings->SetString("extensionSettingsExtensionId",
+      l10n_util::GetStringUTF16(IDS_EXTENSIONS_ID));
+  localized_strings->SetString("extensionSettingsExtensionPath",
+      l10n_util::GetStringUTF16(IDS_EXTENSIONS_PATH));
+  localized_strings->SetString("extensionSettingsInspectViews",
+      l10n_util::GetStringUTF16(IDS_EXTENSIONS_INSPECT_VIEWS));
+  localized_strings->SetString("viewIncognito",
+      l10n_util::GetStringUTF16(IDS_EXTENSIONS_VIEW_INCOGNITO));
+  localized_strings->SetString("extensionSettingsEnable",
+      l10n_util::GetStringUTF16(IDS_EXTENSIONS_ENABLE));
+  localized_strings->SetString("extensionSettingsEnabled",
+      l10n_util::GetStringUTF16(IDS_EXTENSIONS_ENABLED));
+  localized_strings->SetString("extensionSettingsRemove",
+    l10n_util::GetStringUTF16(IDS_EXTENSIONS_REMOVE));
+  localized_strings->SetString("extensionSettingsEnableIncognito",
+      l10n_util::GetStringUTF16(IDS_EXTENSIONS_ENABLE_INCOGNITO));
+  localized_strings->SetString("extensionSettingsAllowFileAccess",
+      l10n_util::GetStringUTF16(IDS_EXTENSIONS_ALLOW_FILE_ACCESS));
+  localized_strings->SetString("extensionSettingsIncognitoWarning",
+      l10n_util::GetStringFUTF16(IDS_EXTENSIONS_INCOGNITO_WARNING,
+                                 l10n_util::GetStringUTF16(IDS_PRODUCT_NAME)));
+  localized_strings->SetString("extensionSettingsReload",
+      l10n_util::GetStringUTF16(IDS_EXTENSIONS_RELOAD));
+  localized_strings->SetString("extensionSettingsOptions",
+      l10n_util::GetStringUTF16(IDS_EXTENSIONS_OPTIONS));
+  localized_strings->SetString("extensionSettingsPolicyControlled",
+     l10n_util::GetStringUTF16(IDS_EXTENSIONS_POLICY_CONTROLLED));
+  localized_strings->SetString("extensionSettingsShowButton",
+      l10n_util::GetStringUTF16(IDS_EXTENSIONS_SHOW_BUTTON));
+  localized_strings->SetString("extensionSettingsLoadUnpackedButton",
+      l10n_util::GetStringUTF16(IDS_EXTENSIONS_LOAD_UNPACKED_BUTTON));
+  localized_strings->SetString("extensionSettingsPackButton",
+      l10n_util::GetStringUTF16(IDS_EXTENSIONS_PACK_BUTTON));
+  localized_strings->SetString("extensionSettingsUpdateButton",
+      l10n_util::GetStringUTF16(IDS_EXTENSIONS_UPDATE_BUTTON));
+  localized_strings->SetString("extensionSettingsCrashMessage",
+      l10n_util::GetStringUTF16(IDS_EXTENSIONS_CRASHED_EXTENSION));
+  localized_strings->SetString("extensionSettingsInDevelopment",
+      l10n_util::GetStringUTF16(IDS_EXTENSIONS_IN_DEVELOPMENT));
+  localized_strings->SetString("extensionSettingsWarningsTitle",
+      l10n_util::GetStringUTF16(IDS_EXTENSION_WARNINGS_TITLE));
+  localized_strings->SetString("extensionSettingsShowDetails",
+      l10n_util::GetStringUTF16(IDS_EXTENSIONS_SHOW_DETAILS));
+  localized_strings->SetString("extensionSettingsHideDetails",
+      l10n_util::GetStringUTF16(IDS_EXTENSIONS_HIDE_DETAILS));
+}
+
+void ExtensionSettingsHandler::Initialize() {
+}
+
+WebUIMessageHandler* ExtensionSettingsHandler::Attach(WebUI* web_ui) {
+  // Call through to superclass.
+  WebUIMessageHandler* handler = OptionsPage2UIHandler::Attach(web_ui);
+
+  extension_service_ = Profile::FromWebUI(web_ui_)
+      ->GetOriginalProfile()->GetExtensionService();
+
+  // Return result from the superclass.
+  return handler;
+}
+
+void ExtensionSettingsHandler::Observe(
+    int type,
+    const content::NotificationSource& source,
+    const content::NotificationDetails& details) {
+  Profile* profile = Profile::FromWebUI(web_ui_);
+  Profile* source_profile = NULL;
+  switch (type) {
+    // We listen for notifications that will result in the page being
+    // repopulated with data twice for the same event in certain cases.
+    // For instance, EXTENSION_LOADED & EXTENSION_HOST_CREATED because
+    // we don't know about the views for an extension at EXTENSION_LOADED, but
+    // if we only listen to EXTENSION_HOST_CREATED, we'll miss extensions
+    // that don't have a process at startup.
+    //
+    // Doing it this way gets everything but causes the page to be rendered
+    // more than we need. It doesn't seem to result in any noticeable flicker.
+    case content::NOTIFICATION_RENDER_VIEW_HOST_DELETED:
+      deleting_rvh_ = content::Source<RenderViewHost>(source).ptr();
+      // Fall through.
+    case content::NOTIFICATION_RENDER_VIEW_HOST_CREATED:
+      source_profile = Profile::FromBrowserContext(
+          content::Source<RenderViewHost>(source)->site_instance()->
+          browsing_instance()->browser_context());
+      if (!profile->IsSameProfile(source_profile))
+        return;
+      MaybeUpdateAfterNotification();
+      break;
+    case chrome::NOTIFICATION_BACKGROUND_CONTENTS_DELETED:
+      deleting_rvh_ = content::Details<BackgroundContents>(details)->
+          tab_contents()->render_view_host();
+      // Fall through.
+    case chrome::NOTIFICATION_BACKGROUND_CONTENTS_NAVIGATED:
+    case chrome::NOTIFICATION_EXTENSION_HOST_CREATED:
+      source_profile = content::Source<Profile>(source).ptr();
+      if (!profile->IsSameProfile(source_profile))
+          return;
+      MaybeUpdateAfterNotification();
+      break;
+    case chrome::NOTIFICATION_EXTENSION_LOADED:
+    case chrome::NOTIFICATION_EXTENSION_UNLOADED:
+    case chrome::NOTIFICATION_EXTENSION_UPDATE_DISABLED:
+    case chrome::NOTIFICATION_EXTENSION_WARNING_CHANGED:
+    case chrome::NOTIFICATION_EXTENSION_BROWSER_ACTION_VISIBILITY_CHANGED:
+      MaybeUpdateAfterNotification();
+      break;
+    default:
+      NOTREACHED();
+  }
+}
+
+const Extension* ExtensionSettingsHandler::GetExtension(const ListValue* args) {
+  std::string extension_id = UTF16ToUTF8(ExtractStringValue(args));
+  CHECK(!extension_id.empty());
+  return extension_service_->GetExtensionById(extension_id, true);
+}
+
+void ExtensionSettingsHandler::MaybeUpdateAfterNotification() {
+  TabContents* contents = web_ui_->tab_contents();
+  if (!ignore_notifications_ && contents && contents->render_view_host())
+    HandleRequestExtensionsData(NULL);
+  deleting_rvh_ = NULL;
+}
+
+// Static
+DictionaryValue* ExtensionSettingsHandler::CreateExtensionDetailValue(
+    ExtensionService* service, const Extension* extension,
+    const std::vector<ExtensionPage>& pages,
+    const ExtensionWarningSet* warnings_set,
+    bool enabled, bool terminated) {
+  DictionaryValue* extension_data = new DictionaryValue();
+  GURL icon =
+      ExtensionIconSource::GetIconURL(extension,
+                                      Extension::EXTENSION_ICON_MEDIUM,
+                                      ExtensionIconSet::MATCH_BIGGER,
+                                      !enabled, NULL);
+  extension_data->SetString("id", extension->id());
+  extension_data->SetString("name", extension->name());
+  extension_data->SetString("description", extension->description());
+  if (extension->location() == Extension::LOAD)
+    extension_data->SetString("path", extension->path().value());
+  extension_data->SetString("version", extension->version()->GetString());
+  extension_data->SetString("icon", icon.spec());
+  extension_data->SetBoolean("isUnpacked",
+                             extension->location() == Extension::LOAD);
+  extension_data->SetBoolean("mayDisable",
+                             Extension::UserMayDisable(extension->location()));
+  extension_data->SetBoolean("enabled", enabled);
+  extension_data->SetBoolean("terminated", terminated);
+  extension_data->SetBoolean("enabledIncognito",
+      service ? service->IsIncognitoEnabled(extension->id()) : false);
+  extension_data->SetBoolean("wantsFileAccess", extension->wants_file_access());
+  extension_data->SetBoolean("allowFileAccess",
+      service ? service->AllowFileAccess(extension) : false);
+  extension_data->SetBoolean("allow_reload",
+                             extension->location() == Extension::LOAD);
+  extension_data->SetBoolean("is_hosted_app", extension->is_hosted_app());
+
+  // Determine the sort order: Extensions loaded through --load-extensions show
+  // up at the top. Disabled extensions show up at the bottom.
+  if (extension->location() == Extension::LOAD)
+    extension_data->SetInteger("order", 1);
+  else
+    extension_data->SetInteger("order", 2);
+
+  if (!extension->options_url().is_empty() && enabled)
+    extension_data->SetString("options_url", extension->options_url().spec());
+
+  if (service && !service->GetBrowserActionVisibility(extension))
+    extension_data->SetBoolean("enable_show_button", true);
+
+  // Add views
+  ListValue* views = new ListValue;
+  for (std::vector<ExtensionPage>::const_iterator iter = pages.begin();
+       iter != pages.end(); ++iter) {
+    DictionaryValue* view_value = new DictionaryValue;
+    if (iter->url.scheme() == chrome::kExtensionScheme) {
+      // No leading slash.
+      view_value->SetString("path", iter->url.path().substr(1));
+    } else {
+      // For live pages, use the full URL.
+      view_value->SetString("path", iter->url.spec());
+    }
+    view_value->SetInteger("renderViewId", iter->render_view_id);
+    view_value->SetInteger("renderProcessId", iter->render_process_id);
+    view_value->SetBoolean("incognito", iter->incognito);
+    views->Append(view_value);
+  }
+  extension_data->Set("views", views);
+  extension_data->SetBoolean("hasPopupAction",
+      extension->browser_action() || extension->page_action());
+  extension_data->SetString("homepageUrl", extension->GetHomepageURL().spec());
+
+  // Add warnings.
+  ListValue* warnings_list = new ListValue;
+  if (warnings_set) {
+    std::set<ExtensionWarningSet::WarningType> warnings;
+    warnings_set->GetWarningsAffectingExtension(extension->id(), &warnings);
+
+    for (std::set<ExtensionWarningSet::WarningType>::const_iterator iter =
+             warnings.begin();
+         iter != warnings.end();
+         ++iter) {
+      string16 warning_string(ExtensionWarningSet::GetLocalizedWarning(*iter));
+      warnings_list->Append(Value::CreateStringValue(warning_string));
+    }
+  }
+  extension_data->Set("warnings", warnings_list);
+
+  return extension_data;
+}
+
+std::vector<ExtensionPage> ExtensionSettingsHandler::GetActivePagesForExtension(
+    const Extension* extension) {
+  std::vector<ExtensionPage> result;
+
+  // Get the extension process's active views.
+  ExtensionProcessManager* process_manager =
+      extension_service_->profile()->GetExtensionProcessManager();
+  GetActivePagesForExtensionProcess(
+      process_manager->GetRenderViewHostsForExtension(
+          extension->id()), &result);
+
+  // Repeat for the incognito process, if applicable.
+  if (extension_service_->profile()->HasOffTheRecordProfile() &&
+      extension->incognito_split_mode()) {
+    ExtensionProcessManager* process_manager =
+        extension_service_->profile()->GetOffTheRecordProfile()->
+            GetExtensionProcessManager();
+    GetActivePagesForExtensionProcess(
+        process_manager->GetRenderViewHostsForExtension(
+            extension->id()), &result);
+  }
+
+  return result;
+}
+
+void ExtensionSettingsHandler::GetActivePagesForExtensionProcess(
+    const std::set<RenderViewHost*>& views,
+    std::vector<ExtensionPage> *result) {
+  for (std::set<RenderViewHost*>::const_iterator iter = views.begin();
+       iter != views.end(); ++iter) {
+    RenderViewHost* host = *iter;
+    int host_type = host->delegate()->GetRenderViewType();
+    if (host == deleting_rvh_ ||
+        chrome::VIEW_TYPE_EXTENSION_POPUP == host_type ||
+        chrome::VIEW_TYPE_EXTENSION_DIALOG == host_type)
+      continue;
+
+    GURL url = host->delegate()->GetURL();
+    content::RenderProcessHost* process = host->process();
+    result->push_back(
+        ExtensionPage(url, process->GetID(), host->routing_id(),
+                      process->GetBrowserContext()->IsOffTheRecord()));
+  }
+}