Add "jni_libs" property to apex module

Which is the list of JNI libraries that are embeded inside the apex.
jni_libs is handled just like native_shared_libs except that it is
stored in apex_manifest.

When linkerconfig finds an apex with JNI libs, it exposes the namespace
for the apex as visible so that libnativeloader can link the namespace
to the corresponding classloader-namespace.

Bug: 149363889
Test: m nothing(runs soong test)
Change-Id: I52ebe38b44545e6e8853e34a3404a235c858112a

apex/builder.go

@@ -180,6 +180,17 @@ func (a *apexBundle) buildManifest(ctx android.ModuleContext, provideNativeLibs,
 		optCommands = append(optCommands, "-v name "+*a.properties.Apex_name)
 	}
 
+	// collect jniLibs. Notice that a.filesInfo is already sorted
+	var jniLibs []string
+	for _, fi := range a.filesInfo {
+		if fi.isJniLib {
+			jniLibs = append(jniLibs, fi.builtFile.Base())
+		}
+	}
+	if len(jniLibs) > 0 {
+		optCommands = append(optCommands, "-a jniLibs "+strings.Join(jniLibs, " "))
+	}
+
 	ctx.Build(pctx, android.BuildParams{
 		Rule:   apexManifestRule,
 		Input:  manifestSrc,