Backup and restore battery saver trigger level

Bug: 17836827
Change-Id: Icb6bf071a0966a8fb9a03fadd0f8b3daa5ad11f8
diff --git a/core/java/android/provider/Settings.java b/core/java/android/provider/Settings.java
index 369efac..c54a5ba 100644
--- a/core/java/android/provider/Settings.java
+++ b/core/java/android/provider/Settings.java
@@ -6629,7 +6629,8 @@
             WIFI_NUM_OPEN_NETWORKS_KEPT,
             EMERGENCY_TONE,
             CALL_AUTO_RETRY,
-            DOCK_AUDIO_MEDIA_ENABLED
+            DOCK_AUDIO_MEDIA_ENABLED,
+            LOW_POWER_MODE_TRIGGER_LEVEL
         };
 
         // Populated lazily, guarded by class object: