Speed up ARC boot if the user launches ARC app while ARC is not ready

chrome/browser/chromeos/settings/device_settings_test_helper.cc

 // Copyright (c) 2012 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/settings/device_settings_test_helper.h"
 
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "chrome/browser/chromeos/ownership/owner_settings_service_chromeos.h"
@@ skipping 171 matching lines @@
 
 void DeviceSettingsTestHelper::CheckArcAvailability(
     const ArcCallback& callback) {}
 
 void DeviceSettingsTestHelper::StartArcInstance(
     const cryptohome::Identification& cryptohome_id,
     const ArcCallback& callback) {}
 
 void DeviceSettingsTestHelper::StopArcInstance(const ArcCallback& callback) {}
 
+void DeviceSettingsTestHelper::PrioritizeArcInstance(
+    const ArcCallback& callback) {}
+
 void DeviceSettingsTestHelper::GetArcStartTime(
     const GetArcStartTimeCallback& callback) {}
 
 void DeviceSettingsTestHelper::RemoveArcData(
     const cryptohome::Identification& cryptohome_id,
     const ArcCallback& callback) {}
 
 DeviceSettingsTestHelper::PolicyState::PolicyState()
     : store_result_(true) {}
 
@@ skipping 76 matching lines @@
         const_cast<user_manager::User*>(user));
   }
   OwnerSettingsServiceChromeOS* service =
       OwnerSettingsServiceChromeOSFactory::GetForBrowserContext(profile_.get());
   CHECK(service);
   if (tpm_is_ready)
     service->OnTPMTokenReady(true /* token is enabled */);
 }
 
 }  // namespace chromeos