Revert "Partial Revert "Populate individual classpath_fragments'..."

Revert submission 14717811-revert-populate-platform-bootclasspath

Reason for revert: retry with a fix
Reverted Changes:
Ib58cd0211:Revert "Add bootclasspath_fragments to platform-bo...
I13b622d6c:Partial Revert "Populate individual classpath_frag...

Bug: 180105615
Test: atest sdkextensions_e2e_tests

Change-Id: I7b6b6b980a4c6430a70394e85222f3b35c4efd5f
diff --git a/java/bootclasspath_fragment.go b/java/bootclasspath_fragment.go
index 6738b09..188d362 100644
--- a/java/bootclasspath_fragment.go
+++ b/java/bootclasspath_fragment.go
@@ -490,8 +490,16 @@
 }
 
 func (b *BootclasspathFragmentModule) ClasspathFragmentToConfiguredJarList(ctx android.ModuleContext) android.ConfiguredJarList {
-	// TODO(satayev): populate with actual content
-	return android.EmptyConfiguredJarList()
+	if "art" == proptools.String(b.properties.Image_name) {
+		return b.getImageConfig(ctx).modules
+	}
+
+	global := dexpreopt.GetGlobalConfig(ctx)
+
+	// Only create configs for updatable boot jars. Non-updatable boot jars must be part of the
+	// platform_bootclasspath's classpath proto config to guarantee that they come before any
+	// updatable jars at runtime.
+	return global.UpdatableBootJars.Filter(b.properties.Contents)
 }
 
 func (b *BootclasspathFragmentModule) getImageConfig(ctx android.EarlyModuleContext) *bootImageConfig {