Add constant for storing market backup state in shared preferences.
diff --git a/core/java/android/provider/Settings.java b/core/java/android/provider/Settings.java
index 789456a..3e818eb 100644
--- a/core/java/android/provider/Settings.java
+++ b/core/java/android/provider/Settings.java
@@ -2992,6 +2992,12 @@
                 "vending_require_sim_for_purchase";
 
         /**
+         * Indicates the Vending Machine backup state. It is set if the
+         * Vending application has been backed up at least once.
+         */
+        public static final String VENDING_BACKUP_STATE = "vending_backup_state";
+
+        /**
          * The current version id of the Vending Machine terms of service.
          */
         public static final String VENDING_TOS_VERSION = "vending_tos_version";