Add CONTAINER_WALLPAPERS for storing wallpaper info.

Test: No
Bug: 188222480
Change-Id: Id85bd46cdd384b359de82f47530a269eee99dd02
diff --git a/src/com/android/launcher3/LauncherSettings.java b/src/com/android/launcher3/LauncherSettings.java
index d663480..03e4ee7 100644
--- a/src/com/android/launcher3/LauncherSettings.java
+++ b/src/com/android/launcher3/LauncherSettings.java
@@ -199,6 +199,7 @@
         public static final int CONTAINER_WIDGETS_TRAY = -105;
         public static final int CONTAINER_BOTTOM_WIDGETS_TRAY = -112;
         public static final int CONTAINER_PIN_WIDGETS = -113;
+        public static final int CONTAINER_WALLPAPERS = -114;
         // Represents search results view.
         public static final int CONTAINER_SEARCH_RESULTS = -106;
         public static final int CONTAINER_SHORTCUTS = -107;