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 8a88bac0d07d11654b6804a182fac97f90fad03b..51967a260b54c16d2e91359332f74ed3069e15a3 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"
@@ -390,11 +391,17 @@ void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry) {
 
 void RegisterUserProfilePrefs(user_prefs::PrefRegistrySyncable* registry) {
   RegisterProfilePrefs(registry);
+
+#if defined(OS_CHROMEOS)
+  chromeos::PowerPrefs::RegisterUserProfilePrefs(registry);
+#endif
 }
 
 #if defined(OS_CHROMEOS)
 void RegisterLoginProfilePrefs(user_prefs::PrefRegistrySyncable* registry) {
   RegisterProfilePrefs(registry);
+
+  chromeos::PowerPrefs::RegisterLoginProfilePrefs(registry);
 }
 #endif