Add RESTORE_MODE_DISABLED to RestoreMode

chrome/browser/chromeos/login/screens/device_disabled_screen.cc

 // Copyright 2014 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/screens/device_disabled_screen.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 30 matching lines @@
     actor_->SetDelegate(nullptr);
 }
 
 void DeviceDisabledScreen::PrepareToShow() {
 }
 
 void DeviceDisabledScreen::Show() {
   if (!actor_ || showing_)
     return;
 
-  bool is_device_disabled = false;
-  g_browser_process->local_state()->GetDictionary(
-      prefs::kServerBackedDeviceState)->GetBoolean(policy::kDeviceStateDisabled,
-                                                   &is_device_disabled);
-  if (!is_device_disabled ||
+  if (policy::GetRestoreMode() != policy::RESTORE_MODE_DISABLED ||

[Denis Kuznetsov (DE-MUC), 2014/10/30 22:18:06]

Do we need to check for trusted mode here?

[bartfab (slow), 2014/11/03 13:32:50]

Device disabling can be triggered by two different protos:
1) DeviceStateRetrievalResponse
2) PolicyData

We receive 1) during OOBE and persist its contents in local state. We trust the
persisted information if the device is not owned yet (see lines 60-75 of this
method).

We receive 2) as part of device policy and persist the whole proto on disk. We
trust the persisted information if its signature is valid, which is exactly what
cros settings trusted means.

Since we are dealing with proto 1) here, we do not need to worry about the cros
settings trusted state.

       CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kDisableDeviceDisabling)) {
     // Skip the screen if the device is not marked as disabled or device
     // disabling has been turned off by flag.
     IndicateDeviceNotDisabled();
     return;
   }
 
   policy::BrowserPolicyConnectorChromeOS* connector =
       g_browser_process->platform_part()->browser_policy_connector_chromeos();
@@ skipping 38 matching lines @@
 void DeviceDisabledScreen::OnActorDestroyed(DeviceDisabledScreenActor* actor) {
   if (actor_ == actor)
     actor_ = nullptr;
 }
 
 void DeviceDisabledScreen::IndicateDeviceNotDisabled() {
   get_base_screen_delegate()->OnExit(BaseScreenDelegate::DEVICE_NOT_DISABLED);
 }
 
 }  // namespace chromeos