Mark some data structures used in SkyValues during the loading phase as being Serializable.

--
MOS_MIGRATED_REVID=85944539

1 files changed, 2 insertions, 1 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/query2/output/OutputFormatter.java b/src/main/java/com/google/devtools/build/lib/query2/output/OutputFormatter.java
index b7a9d64ed4..e7cd9083cc 100644
--- a/src/main/java/com/google/devtools/build/lib/query2/output/OutputFormatter.java
+++ b/src/main/java/com/google/devtools/build/lib/query2/output/OutputFormatter.java
@@ -33,6 +33,7 @@ import com.google.devtools.common.options.EnumConverter;
 
 import java.io.IOException;
 import java.io.PrintStream;
+import java.io.Serializable;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.Comparator;
@@ -48,7 +49,7 @@ import java.util.Set;
  * Interface for classes which order, format and print the result of a Blaze
  * graph query.
  */
-public abstract class OutputFormatter {
+public abstract class OutputFormatter implements Serializable {
 
   /**
    * Discriminator for different kinds of OutputFormatter.