Allow BazelPackageLoader to load external repositories.
Also, disallow BazelPackageLoader from fetching missing external repos.

Integration tests for BazelPackageLoader wrt external repos will be left for a follow-up CL.

RELNOTES: None.
PiperOrigin-RevId: 188967694
diff --git a/src/test/java/com/google/devtools/build/lib/skyframe/TimestampBuilderTestCase.java b/src/test/java/com/google/devtools/build/lib/skyframe/TimestampBuilderTestCase.java
index 3348527..8554b25 100644
--- a/src/test/java/com/google/devtools/build/lib/skyframe/TimestampBuilderTestCase.java
+++ b/src/test/java/com/google/devtools/build/lib/skyframe/TimestampBuilderTestCase.java
@@ -220,7 +220,7 @@
                     new WorkspaceFileFunction(
                         TestRuleClassProvider.getRuleClassProvider(),
                         TestConstants.PACKAGE_FACTORY_BUILDER_FACTORY_FOR_TESTING
-                            .builder()
+                            .builder(directories)
                             .build(
                                 TestRuleClassProvider.getRuleClassProvider(),
                                 scratch.getFileSystem()),