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

chrome/browser/chromeos/chrome_browser_main_chromeos.cc

Index: chrome/browser/chromeos/chrome_browser_main_chromeos.cc
diff --git a/chrome/browser/chromeos/chrome_browser_main_chromeos.cc b/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
index e4a99d05c5c190dd8b19a3243866d7f9110db710..8c2e19a76d6a894ce610f7d626627fd7cf9a8e07 100644
--- a/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
+++ b/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
@@ -60,6 +60,7 @@
 #include "chrome/browser/chromeos/power/idle_action_warning_observer.h"
 #include "chrome/browser/chromeos/power/peripheral_battery_observer.h"
 #include "chrome/browser/chromeos/power/power_button_observer.h"
+#include "chrome/browser/chromeos/power/power_prefs.h"
 #include "chrome/browser/chromeos/power/resume_observer.h"
 #include "chrome/browser/chromeos/power/screen_lock_observer.h"
 #include "chrome/browser/chromeos/power/suspend_observer.h"
@@ -99,6 +100,7 @@
 #include "chromeos/cryptohome/async_method_caller.h"
 #include "chromeos/cryptohome/cryptohome_library.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
+#include "chromeos/dbus/power_policy_controller.h"
 #include "chromeos/dbus/session_manager_client.h"
 #include "chromeos/disks/disk_mount_manager.h"
 #include "chromeos/ime/input_method_manager.h"
@@ -588,6 +590,9 @@ void ChromeBrowserMainPartsChromeos::PreProfileInit() {
     WizardController::SetZeroDelays();
   }
 
+  power_prefs_.reset(new PowerPrefs(
+      DBusThreadManager::Get()->GetPowerPolicyController()));
+
   // In Aura builds this will initialize ash::Shell.
   ChromeBrowserMainPartsLinux::PreProfileInit();
 }
@@ -787,6 +792,7 @@ void ChromeBrowserMainPartsChromeos::PostMainMessageLoopRun() {
   brightness_observer_.reset();
   retail_mode_power_save_blocker_.reset();
   peripheral_battery_observer_.reset();
+  power_prefs_.reset();
 
   // The XInput2 event listener needs to be shut down earlier than when
   // Singletons are finally destroyed in AtExitManager.