Merge "Hide stackId from prying eyes." into klp-dev

api/current.txt

@@ -2991,7 +2991,6 @@ package android.app {
     field public int id;
     field public android.content.ComponentName origActivity;
     field public int persistentId;
-    field public int stackId;
   }
 
   public static class ActivityManager.RunningAppProcessInfo implements android.os.Parcelable {

core/java/android/app/ActivityManager.java

@@ -490,6 +490,7 @@ public class ActivityManager {
 
         /**
          * The id of the ActivityStack this Task was on most recently.
+         * @hide
          */
         public int stackId;