ThreadRestrictions: disallow blocking IO on the UI thread

chrome/browser/dom_ui/options/import_data_handler.cc

 // Copyright (c) 2010 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/dom_ui/options/import_data_handler.h"
 
 #include "app/l10n_util.h"
 #include "base/basictypes.h"
+#include "base/callback.h"
 #include "base/scoped_ptr.h"
 #include "base/string16.h"
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
+#include "base/thread_restrictions.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
-#include "base/callback.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profile.h"
 #include "grit/chromium_strings.h"
 #include "grit/generated_resources.h"
 #include "chrome/browser/importer/importer_data_types.h"
 
 ImportDataHandler::ImportDataHandler() : importer_host_(NULL) {
 }
 
 ImportDataHandler::~ImportDataHandler() {
@@ skipping 19 matching lines @@
   localized_strings->SetString("import_passwords",
       l10n_util::GetStringUTF16(IDS_IMPORT_PASSWORDS_CHKBOX));
   localized_strings->SetString("import_history",
       l10n_util::GetStringUTF16(IDS_IMPORT_HISTORY_CHKBOX));
   localized_strings->SetString("no_profile_found",
       l10n_util::GetStringUTF16(IDS_IMPORT_NO_PROFILE_FOUND));
 }
 
 void ImportDataHandler::Initialize() {
   importer_list_.reset(new ImporterList);
+
+  // We should not be loading profiles from the UI thread!
+  // Temporarily allow this until we fix
+  //   http://code.google.com/p/chromium/issues/detail?id=60825
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
   importer_list_->DetectSourceProfiles();
   int profiles_count = importer_list_->GetAvailableProfileCount();
 
   ListValue browser_profiles;
   if (profiles_count > 0) {
     for (int i = 0; i < profiles_count; i++) {
       const importer::ProfileInfo& source_profile =
           importer_list_->GetSourceProfileInfoAt(i);
       string16 browser_name = WideToUTF16Hack(source_profile.description);
       uint16 browser_services = source_profile.services_supported;
@@ skipping 88 matching lines @@
 void ImportDataHandler::ImportItemEnded(importer::ImportItem item) {
   // TODO(csilv): show progress detail in the web view.
 }
 
 void ImportDataHandler::ImportEnded() {
   importer_host_->SetObserver(NULL);
   importer_host_ = NULL;
 
   dom_ui_->CallJavascriptFunction(L"ImportDataOverlay.dismiss");
 }