Allow package blacklisting to be done via a file checked into the depot. By default this is disabled.

--
MOS_MIGRATED_REVID=107644420
diff --git a/src/test/java/com/google/devtools/build/lib/skyframe/FilesetEntryFunctionTest.java b/src/test/java/com/google/devtools/build/lib/skyframe/FilesetEntryFunctionTest.java
index aa03d90..f8f0a45 100644
--- a/src/test/java/com/google/devtools/build/lib/skyframe/FilesetEntryFunctionTest.java
+++ b/src/test/java/com/google/devtools/build/lib/skyframe/FilesetEntryFunctionTest.java
@@ -94,6 +94,8 @@
     skyFunctions.put(
         SkyFunctions.RECURSIVE_FILESYSTEM_TRAVERSAL, new RecursiveFilesystemTraversalFunction());
     skyFunctions.put(SkyFunctions.PACKAGE_LOOKUP, new PackageLookupFunction(deletedPackages));
+    skyFunctions.put(SkyFunctions.BLACKLISTED_PACKAGE_PREFIXES,
+        new BlacklistedPackagePrefixesFunction());
     skyFunctions.put(SkyFunctions.FILESET_ENTRY, new FilesetEntryFunction());
 
     differencer = new RecordingDifferencer();
@@ -101,7 +103,8 @@
     driver = new SequentialBuildDriver(evaluator);
     PrecomputedValue.BUILD_ID.set(differencer, UUID.randomUUID());
     PrecomputedValue.PATH_PACKAGE_LOCATOR.set(differencer, pkgLocator.get());
-    PrecomputedValue.BLACKLISTED_PKG_PREFIXES.set(differencer, ImmutableSet.<PathFragment>of());
+    PrecomputedValue.BLACKLISTED_PACKAGE_PREFIXES_FILE.set(differencer,
+        PathFragment.EMPTY_FRAGMENT);
   }
 
   private Artifact getSourceArtifact(String path) throws Exception {