Generate a boot image extension for mainline BCP jars.

Bug: 269230245
Test: m
Test: atest art_standalone_dexpreopt_tests
Change-Id: I253c30d938eee2cf2549ec2338425d53956e7cbb
diff --git a/java/dexpreopt_config_test.go b/java/dexpreopt_config_test.go
index b704d09..cd7f295 100644
--- a/java/dexpreopt_config_test.go
+++ b/java/dexpreopt_config_test.go
@@ -28,8 +28,10 @@
 
 	result := android.GroupFixturePreparers(
 		PrepareForBootImageConfigTest,
+		PrepareApexBootJarConfigs,
 	).RunTest(t)
 
 	CheckArtBootImageConfig(t, result)
 	CheckFrameworkBootImageConfig(t, result)
+	CheckMainlineBootImageConfig(t, result)
 }