Useful annotations for code documentation.

Bug: 6537978
Change-Id: I806c3c09e3255f8789455f13bf37c1dde2a93f1f
diff --git a/core/java/android/content/SyncStorageEngine.java b/core/java/android/content/SyncStorageEngine.java
index 10e7bff..bdc5a3f 100644
--- a/core/java/android/content/SyncStorageEngine.java
+++ b/core/java/android/content/SyncStorageEngine.java
@@ -16,6 +16,7 @@
 
 package android.content;
 
+import com.android.internal.annotations.VisibleForTesting;
 import com.android.internal.util.ArrayUtils;
 import com.android.internal.util.FastXmlSerializer;
 
@@ -74,7 +75,7 @@
 
     private static final long DEFAULT_POLL_FREQUENCY_SECONDS = 60 * 60 * 24; // One day
 
-    // @VisibleForTesting
+    @VisibleForTesting
     static final long MILLIS_IN_4WEEKS = 1000L * 60 * 60 * 24 * 7 * 4;
 
     /** Enum value for a sync start event. */