Add calendar_sync_window_days setting to control calendar sync window.
diff --git a/core/java/android/provider/Settings.java b/core/java/android/provider/Settings.java
index 3e818eb..7e3f3c2 100644
--- a/core/java/android/provider/Settings.java
+++ b/core/java/android/provider/Settings.java
@@ -3346,6 +3346,14 @@
         public static final String USE_LOCATION_FOR_SERVICES = "use_location";
 
         /**
+         * The length of the calendar sync window into the future.
+         * This specifies the number of days into the future for the sliding window sync.
+         * Setting this to zero will disable sliding sync.
+         */
+        public static final String GOOGLE_CALENDAR_SYNC_WINDOW_DAYS =
+                "google_calendar_sync_window_days";
+
+        /**
          * @deprecated
          * @hide
          */