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 001fdd49a1db64d2205ed8ede6bfbea2be3e66e2..0e4e868fdb5e48b450b2c57d1d64d9edf50a0495 100644
--- a/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
+++ b/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
@@ -61,6 +61,7 @@
 #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"
@@ -98,6 +99,7 @@
 #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"
@@ -566,6 +568,9 @@ void ChromeBrowserMainPartsChromeos::PreProfileInit() {
     WizardController::SetZeroDelays();
   }
 
+  power_prefs_.reset(new PowerPrefs(
+      DBusThreadManager::Get()->GetPowerPolicyController()));
+
   // In Aura builds this will initialize ash::Shell.
   ChromeBrowserMainPartsLinux::PreProfileInit();
 
@@ -774,6 +779,7 @@ 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.