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/ContainingPackageLookupFunctionTest.java b/src/test/java/com/google/devtools/build/lib/skyframe/ContainingPackageLookupFunctionTest.java
index 0c80029..72a47a5 100644
--- a/src/test/java/com/google/devtools/build/lib/skyframe/ContainingPackageLookupFunctionTest.java
+++ b/src/test/java/com/google/devtools/build/lib/skyframe/ContainingPackageLookupFunctionTest.java
@@ -57,6 +57,8 @@
     Map<SkyFunctionName, SkyFunction> skyFunctions = new HashMap<>();
     skyFunctions.put(SkyFunctions.PACKAGE_LOOKUP, new PackageLookupFunction(deletedPackages));
     skyFunctions.put(SkyFunctions.CONTAINING_PACKAGE_LOOKUP, new ContainingPackageLookupFunction());
+    skyFunctions.put(SkyFunctions.BLACKLISTED_PACKAGE_PREFIXES,
+        new BlacklistedPackagePrefixesFunction());
     skyFunctions.put(SkyFunctions.FILE_STATE, new FileStateFunction(tsgm, externalFilesHelper));
     skyFunctions.put(SkyFunctions.FILE, new FileFunction(pkgLocator, tsgm, externalFilesHelper));
     RecordingDifferencer differencer = new RecordingDifferencer();
@@ -64,7 +66,8 @@
     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 ContainingPackageLookupValue lookupContainingPackage(String packageName)