Treat accessibility actions as user activity

Resurrecting ag/665912.

Bug: 19531976
Change-Id: Ibdddd507215e61b9f4313c36eab8845e9940a7ac
diff --git a/core/java/android/os/BatteryStats.java b/core/java/android/os/BatteryStats.java
index e1c7ad77..6df2a9d 100644
--- a/core/java/android/os/BatteryStats.java
+++ b/core/java/android/os/BatteryStats.java
@@ -477,10 +477,10 @@
          * also be bumped.
          */
         static final String[] USER_ACTIVITY_TYPES = {
-            "other", "button", "touch"
+            "other", "button", "touch", "accessibility"
         };
         
-        public static final int NUM_USER_ACTIVITY_TYPES = 3;
+        public static final int NUM_USER_ACTIVITY_TYPES = 4;
 
         public abstract void noteUserActivityLocked(int type);
         public abstract boolean hasUserActivity();