Add policies to control power management on the Chrome OS login screen

chrome/browser/prefs/browser_prefs.cc

Index: chrome/browser/prefs/browser_prefs.cc
diff --git a/chrome/browser/prefs/browser_prefs.cc b/chrome/browser/prefs/browser_prefs.cc
index 1bf968834cf5a61a78bce8f17ba73f1bc310bd9e..f58b116ddbe55720b4e3d03506ef3863184124dc 100644
--- a/chrome/browser/prefs/browser_prefs.cc
+++ b/chrome/browser/prefs/browser_prefs.cc
@@ -135,6 +135,7 @@
 #include "chrome/browser/chromeos/policy/auto_enrollment_client.h"
 #include "chrome/browser/chromeos/policy/device_cloud_policy_manager_chromeos.h"
 #include "chrome/browser/chromeos/policy/device_status_collector.h"
+#include "chrome/browser/chromeos/power/power_prefs.h"
 #include "chrome/browser/chromeos/preferences.h"
 #include "chrome/browser/chromeos/proxy_config_service_impl.h"
 #include "chrome/browser/chromeos/settings/device_oauth2_token_service.h"
@@ -374,6 +375,7 @@ void RegisterUserPrefs(user_prefs::PrefRegistrySyncable* registry,
 
 #if defined(OS_CHROMEOS)
   chromeos::OAuth2LoginManager::RegisterUserPrefs(registry);
+  chromeos::PowerPrefs::RegisterUserPrefs(registry, for_signin_profile);
   chromeos::Preferences::RegisterUserPrefs(registry);
   chromeos::ProxyConfigServiceImpl::RegisterUserPrefs(registry);
   extensions::EnterprisePlatformKeysPrivateChallengeUserKeyFunction::