[snapshot] optimizing WatchedArrayList snapshot am: d5c4c550e4

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18185712

Change-Id: Icbecd9f30e5ad59b04064490db4efc505a5edf54
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

services/core/java/com/android/server/utils/WatchedArrayList.java

@@ -416,7 +416,7 @@ public class WatchedArrayList<E> extends WatchableImpl
         dst.mStorage.ensureCapacity(end);
         for (int i = 0; i < end; i++) {
             final E val = Snapshots.maybeSnapshot(src.get(i));
-            dst.add(i, val);
+            dst.add(val);
         }
         dst.seal();
     }