Add control for double tap to wake setting

Bug: 16875464
Change-Id: Ic1ad910dd38acbc68ef040b2acdf3696ec2c2e4e
diff --git a/core/java/android/provider/Settings.java b/core/java/android/provider/Settings.java
index dc70d7b..d3a5561 100644
--- a/core/java/android/provider/Settings.java
+++ b/core/java/android/provider/Settings.java
@@ -5517,6 +5517,12 @@
         public static final String APP_IDLE_DURATION = "app_idle_duration";
 
         /**
+         * Controls whether double tap to wake is enabled.
+         * @hide
+         */
+        public static final String DOUBLE_TAP_TO_WAKE = "double_tap_to_wake";
+
+        /**
          * This are the settings to be backed up.
          *
          * NOTE: Settings are backed up and restored in the order they appear
@@ -5571,7 +5577,8 @@
             MOUNT_UMS_PROMPT,
             MOUNT_UMS_NOTIFY_ENABLED,
             UI_NIGHT_MODE,
-            SLEEP_TIMEOUT
+            SLEEP_TIMEOUT,
+            DOUBLE_TAP_TO_WAKE,
         };
 
         /**