Add a flag to toggle the automatic storage manager on and off.

This flag will be used in both Settings and Setup Wizard to enable
and disable the automatic storage manager.

Bug:28905328
Change-Id: Iafc374448d96171ad0a4c36f6fea5e0118105a8c
diff --git a/core/java/android/provider/Settings.java b/core/java/android/provider/Settings.java
index cfdbe21..438bb8c 100755
--- a/core/java/android/provider/Settings.java
+++ b/core/java/android/provider/Settings.java
@@ -6220,6 +6220,14 @@
                 "managed_profile_contact_remote_search";
 
         /**
+         * Whether or not the automatic storage manager is enabled and should run on the device.
+         *
+         * @hide
+         */
+        public static final String AUTOMATIC_STORAGE_MANAGER_ENABLED =
+                "automatic_storage_manager_enabled";
+
+        /**
          * This are the settings to be backed up.
          *
          * NOTE: Settings are backed up and restored in the order they appear