Notify the output service at startup whether output tree tracking is enabled.

--
MOS_MIGRATED_REVID=108142409
diff --git a/src/main/java/com/google/devtools/build/lib/exec/OutputService.java b/src/main/java/com/google/devtools/build/lib/exec/OutputService.java
index 2a48b5c..d4c38e5 100644
--- a/src/main/java/com/google/devtools/build/lib/exec/OutputService.java
+++ b/src/main/java/com/google/devtools/build/lib/exec/OutputService.java
@@ -57,11 +57,13 @@
    * Start the build.
    *
    * @param buildId the UUID build identifier
+   * @param finalizeActions whether this build is finalizing actions so that the output service
+   *                        can track output tree modifications
    * @return a ModifiedFileSet of changed output files.
    * @throws BuildFailedException if build preparation failed
    * @throws InterruptedException
    */
-  ModifiedFileSet startBuild(UUID buildId)
+  ModifiedFileSet startBuild(UUID buildId, boolean finalizeActions)
       throws BuildFailedException, AbruptExitException, InterruptedException;
 
   /**