Temporary whitelist several cases of disk I/O on the UI threads in cros.

chrome/browser/chromeos/login/ownership_service.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/chromeos/login/ownership_service.h"
 
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/lazy_instance.h"
+#include "base/threading/thread_restrictions.h"
 #include "chrome/browser/browser_thread.h"
 
 namespace chromeos {
 
 static base::LazyInstance<OwnershipService> g_ownership_service(
     base::LINKER_INITIALIZED);
 
 //  static
 OwnershipService* OwnershipService::GetSharedInstance() {
   return g_ownership_service.Pointer();
 }
 
 OwnershipService::OwnershipService()
     : manager_(new OwnerManager),
       utils_(OwnerKeyUtils::Create()) {
 }
 
 OwnershipService::~OwnershipService() {}
 
 
 bool OwnershipService::IsAlreadyOwned() {
+  // This should not do blocking IO from the UI thread.
+  // Temporarily allow it for now. http://crbug.com/70097
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
   return file_util::PathExists(utils_->GetOwnerKeyFilePath());
 }
 
 bool OwnershipService::StartLoadOwnerKeyAttempt() {
   if (!IsAlreadyOwned()) {
     LOG(WARNING) << "Device not yet owned";
     return false;
   }
   BrowserThread::PostTask(
       BrowserThread::FILE, FROM_HERE,
@@ skipping 54 matching lines @@
   return;
 }
 
 bool OwnershipService::CurrentUserIsOwner() {
   // If this user has the private key associated with the owner's
   // public key, this user is the owner.
   return IsAlreadyOwned() && manager_->EnsurePrivateKey();
 }
 
 }  // namespace chromeos