backup launcher preferences

Bug: 11267816
Change-Id: I12a32477164fe2205bc8cb02e0a23c561a7f9189
diff --git a/src/com/android/launcher3/LauncherBackupHelper.java b/src/com/android/launcher3/LauncherBackupHelper.java
index 8023fcd..2a5ed69 100644
--- a/src/com/android/launcher3/LauncherBackupHelper.java
+++ b/src/com/android/launcher3/LauncherBackupHelper.java
@@ -82,6 +82,8 @@
 
     public static final String LAUNCHER_PREFIX = "L";
 
+    public static final String LAUNCHER_PREFS_PREFIX = "LP";
+
     private static final Bitmap.CompressFormat IMAGE_FORMAT =
             android.graphics.Bitmap.CompressFormat.PNG;