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

chrome/browser/chromeos/policy/device_policy_decoder_chromeos.cc

Index: chrome/browser/chromeos/policy/device_policy_decoder_chromeos.cc
diff --git a/chrome/browser/chromeos/policy/device_policy_decoder_chromeos.cc b/chrome/browser/chromeos/policy/device_policy_decoder_chromeos.cc
index 15359ece2e19570082bcd121d70c6e3107caeda1..8c7de9f533353285651b38297e415ce1642f5dbc 100644
--- a/chrome/browser/chromeos/policy/device_policy_decoder_chromeos.cc
+++ b/chrome/browser/chromeos/policy/device_policy_decoder_chromeos.cc
@@ -577,6 +577,18 @@ void DecodeGenericPolicies(const em::ChromeDeviceSettingsProto& policy,
                         policy.attestation_settings().attestation_enabled()));
     }
   }
+
+  if (policy.has_login_screen_power_management()) {
+    const em::LoginScreenPowerManagementProto& container(
+        policy.login_screen_power_management());
+    if (container.has_login_screen_power_management()) {
+      policies->Set(key::kDeviceLoginScreenPowerManagement,
+                    POLICY_LEVEL_MANDATORY,
+                    POLICY_SCOPE_MACHINE,
+                    Value::CreateStringValue(
+                        container.login_screen_power_management()));
+    }
+  }
 }
 
 }  // namespace