Use both module name and stem name to filter updatable boot jars

Sometimes the stem property is set to change both the installed file
name and the name use to filter the configured module list, e.g. when
adding a test library to replace the standard library, e.g. test_foo
instead of foo.

Sometimes it is used just to change the installed file name.

This change uses both to filter the updatable boot jars and not just
the stem.

Bug: 180105615
Test: m nothing
Change-Id: I6c459fc3597b1e4f062bc9a4e52843305b538c5f
diff --git a/java/systemserver_classpath_fragment.go b/java/systemserver_classpath_fragment.go
index 252c615..28a5a2c 100644
--- a/java/systemserver_classpath_fragment.go
+++ b/java/systemserver_classpath_fragment.go
@@ -106,21 +106,12 @@
 func (s *SystemServerClasspathModule) configuredJars(ctx android.ModuleContext) android.ConfiguredJarList {
 	global := dexpreopt.GetGlobalConfig(ctx)
 
-	// Convert content names to their appropriate stems, in case a test library is overriding an actual boot jar
-	var stems []string
-	for _, name := range s.properties.Contents {
-		dep := ctx.GetDirectDepWithTag(name, systemServerClasspathFragmentContentDepTag)
-		if m, ok := dep.(ModuleWithStem); ok {
-			stems = append(stems, m.Stem())
-		} else {
-			ctx.PropertyErrorf("contents", "%v is not a ModuleWithStem", name)
-		}
-	}
+	possibleUpdatableModules := gatherPossibleUpdatableModuleNamesAndStems(ctx, s.properties.Contents, systemServerClasspathFragmentContentDepTag)
 
 	// Only create configs for updatable boot jars. Non-updatable system server jars must be part of the
 	// platform_systemserverclasspath's classpath proto config to guarantee that they come before any
 	// updatable jars at runtime.
-	return global.UpdatableSystemServerJars.Filter(stems)
+	return global.UpdatableSystemServerJars.Filter(possibleUpdatableModules)
 }
 
 type systemServerClasspathFragmentContentDependencyTag struct {