Add a system server JAR

Add a Java system server classpath fragment to wrap access to
composd. Provide initially empty SystemService and JobService classes.

Bug: 199147668
Test: manual
Change-Id: I5b2bb2f4c9b9086cca85983d0a659ea92409f6bf
diff --git a/compos/apex/Android.bp b/compos/apex/Android.bp
index c68899a..43e75e4 100644
--- a/compos/apex/Android.bp
+++ b/compos/apex/Android.bp
@@ -51,6 +51,8 @@
         "compsvc",
     ],
 
+    systemserverclasspath_fragments: ["com.android.compos-systemserverclasspath-fragment"],
+
     apps: [
         "CompOSPayloadApp",
     ],
@@ -61,6 +63,12 @@
     ],
 }
 
+systemserverclasspath_fragment {
+    name: "com.android.compos-systemserverclasspath-fragment",
+    contents: ["service-compos"],
+    apex_available: ["com.android.compos"],
+}
+
 prebuilt_etc {
     name: "com.android.compos.init.rc",
     src: "composd.rc",